v1.3.0

* Uses pmr::string for the connection read and write buffer.
* Improvements in the examples.

.clang-tidy

@@ -9,6 +9,7 @@ Checks: "*,\
   -google-readability-braces-around-statements,\
   -hicpp-braces-around-statements,\
   -hicpp-named-parameter,\
+  -hicpp-avoid-goto,\
   -google-build-using-namespace,\
   -altera-*,\
   -fuchsia-*,\
@@ -21,6 +22,12 @@ Checks: "*,\
   -bugprone-use-after-move,\
   -hicpp-invalid-access-moved,\
   -misc-no-recursion,\
+  -cppcoreguidelines-pro-bounds-pointer-arithmetic,\
+  -cppcoreguidelines-avoid-magic-numbers,\
+  -cppcoreguidelines-pro-bounds-constant-array-index,\
+  -cppcoreguidelines-interfaces-global-init,\
+  -cppcoreguidelines-macro-usage,\
+  -cppcoreguidelines-avoid-goto,\
   -cppcoreguidelines-non-private-member-variables-in-classes"
 WarningsAsErrors: ''
 CheckOptions:

CMakeLists.txt

@@ -10,7 +10,7 @@ cmake_minimum_required(VERSION 3.14)
 
 project(
     Aedis
-    VERSION 1.1.0
+    VERSION 1.3.0
     DESCRIPTION "A redis client designed for performance and scalability"
     HOMEPAGE_URL "https://mzimbres.github.io/aedis"
     LANGUAGES CXX
@@ -21,6 +21,7 @@ target_include_directories(aedis INTERFACE
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
     $<INSTALL_INTERFACE:include>
 )
+
 target_link_libraries(aedis
   INTERFACE
     Boost::asio
@@ -50,66 +51,106 @@ find_package(OpenSSL REQUIRED)
 enable_testing()
 include_directories(include)
 
+# Main function for the examples.
+#=======================================================================
+
+add_library(common STATIC examples/common.cpp)
+target_compile_features(common PUBLIC cxx_std_20)
+
 # Executables
 #=======================================================================
 
-add_executable(chat_room examples/chat_room.cpp)
-add_executable(containers examples/containers.cpp)
-add_executable(echo_server examples/echo_server.cpp)
-add_executable(intro examples/intro.cpp)
-add_executable(intro_tls examples/intro_tls.cpp)
 #add_executable(intro_sync examples/intro_sync.cpp) // Uncomment after update to Boost 1.80
-add_executable(serialization examples/serialization.cpp)
-add_executable(subscriber examples/subscriber.cpp)
-add_executable(subscriber_sentinel examples/subscriber_sentinel.cpp)
-add_executable(test_low_level tests/low_level.cpp)
-add_executable(low_level_sync examples/low_level_sync.cpp)
-add_executable(test_connection_other tests/connection_other.cpp)
-add_executable(test_connection_connect tests/connection_connect.cpp)
-add_executable(test_connection_push tests/connection_push.cpp)
-add_executable(test_connection_quit tests/connection_quit.cpp)
-add_executable(test_connection_quit_coalesce tests/connection_quit_coalesce.cpp)
-add_executable(test_connection_reconnect tests/connection_reconnect.cpp)
-add_executable(test_connection_tls tests/connection_tls.cpp)
 
+add_executable(intro examples/intro.cpp)
+target_link_libraries(intro common)
+target_compile_features(intro PUBLIC cxx_std_20)
+add_test(intro intro)
+
+add_executable(chat_room examples/chat_room.cpp)
 target_compile_features(chat_room PUBLIC cxx_std_20)
-target_compile_features(intro PUBLIC cxx_std_17)
-target_compile_features(intro_tls PUBLIC cxx_std_17)
-target_compile_features(serialization PUBLIC cxx_std_17)
-target_compile_features(containers PUBLIC cxx_std_17)
-target_compile_features(test_low_level PUBLIC cxx_std_17)
-target_compile_features(low_level_sync PUBLIC cxx_std_17)
-target_compile_features(echo_server PUBLIC cxx_std_20)
-target_compile_features(subscriber PUBLIC cxx_std_20)
-target_compile_features(subscriber_sentinel PUBLIC cxx_std_20)
-target_compile_features(test_connection_other PUBLIC cxx_std_20)
-target_compile_features(test_connection_push PUBLIC cxx_std_20)
-target_compile_features(test_connection_connect PUBLIC cxx_std_17)
-target_compile_features(test_connection_quit PUBLIC cxx_std_17)
-target_compile_features(test_connection_quit_coalesce PUBLIC cxx_std_17)
-target_compile_features(test_connection_reconnect PUBLIC cxx_std_20)
-target_compile_features(test_connection_tls PUBLIC cxx_std_17)
+target_link_libraries(chat_room common)
 
+add_executable(containers examples/containers.cpp)
+target_compile_features(containers PUBLIC cxx_std_20)
+target_link_libraries(containers common)
+add_test(containers containers)
+
+add_executable(echo_server examples/echo_server.cpp)
+target_compile_features(echo_server PUBLIC cxx_std_20)
+target_link_libraries(echo_server common)
+
+add_executable(resolve_with_sentinel examples/resolve_with_sentinel.cpp)
+target_compile_features(resolve_with_sentinel PUBLIC cxx_std_20)
+target_link_libraries(resolve_with_sentinel common)
+add_test(resolve_with_sentinel resolve_with_sentinel)
+
+add_executable(serialization examples/serialization.cpp)
+target_compile_features(serialization PUBLIC cxx_std_20)
+target_link_libraries(serialization common)
+add_test(serialization serialization)
+
+add_executable(subscriber examples/subscriber.cpp)
+target_compile_features(subscriber PUBLIC cxx_std_20)
+target_link_libraries(subscriber common)
+
+add_executable(intro_tls examples/intro_tls.cpp)
+target_compile_features(intro_tls PUBLIC cxx_std_20)
+add_test(intro_tls intro_tls)
 target_link_libraries(intro_tls OpenSSL::Crypto OpenSSL::SSL)
-target_link_libraries(test_connection_tls OpenSSL::Crypto OpenSSL::SSL)
+target_link_libraries(intro_tls common)
+
+add_executable(echo_server_client benchmarks/cpp/asio/echo_server_client.cpp)
+add_executable(echo_server_direct benchmarks/cpp/asio/echo_server_direct.cpp)
+add_executable(low_level_sync examples/low_level_sync.cpp)
+add_executable(low_level_async examples/low_level_async.cpp)
+add_executable(test_conn_exec tests/conn_exec.cpp)
+add_executable(test_conn_push tests/conn_push.cpp)
+add_executable(test_conn_quit tests/conn_quit.cpp)
+add_executable(test_conn_quit_coalesce tests/conn_quit_coalesce.cpp)
+add_executable(test_conn_reconnect tests/conn_reconnect.cpp)
+add_executable(test_conn_tls tests/conn_tls.cpp)
+add_executable(test_low_level tests/low_level.cpp)
+add_executable(test_conn_run_cancel tests/conn_run_cancel.cpp)
+add_executable(test_conn_exec_cancel tests/conn_exec_cancel.cpp)
+add_executable(test_conn_echo_stress tests/conn_echo_stress.cpp)
+add_executable(test_request tests/request.cpp)
+
+target_compile_features(echo_server_client PUBLIC cxx_std_20)
+target_compile_features(echo_server_direct PUBLIC cxx_std_20)
+target_compile_features(low_level_sync PUBLIC cxx_std_17)
+target_compile_features(low_level_async PUBLIC cxx_std_20)
+target_compile_features(test_conn_exec PUBLIC cxx_std_20)
+target_compile_features(test_conn_push PUBLIC cxx_std_20)
+target_compile_features(test_conn_quit PUBLIC cxx_std_17)
+target_compile_features(test_conn_quit_coalesce PUBLIC cxx_std_17)
+target_compile_features(test_conn_reconnect PUBLIC cxx_std_20)
+target_compile_features(test_conn_tls PUBLIC cxx_std_17)
+target_compile_features(test_low_level PUBLIC cxx_std_17)
+target_compile_features(test_conn_run_cancel PUBLIC cxx_std_20)
+target_compile_features(test_conn_exec_cancel PUBLIC cxx_std_20)
+target_compile_features(test_conn_echo_stress PUBLIC cxx_std_20)
+target_compile_features(test_request PUBLIC cxx_std_17)
+
+target_link_libraries(test_conn_tls OpenSSL::Crypto OpenSSL::SSL)
 
 # Tests
 #=======================================================================
 
-add_test(containers containers)
-add_test(intro intro)
-add_test(intro_tls intro_tls)
 #add_test(intro_sync intro_sync)
-add_test(serialization serialization)
 add_test(low_level_sync low_level_sync)
+add_test(low_level_async low_level_async)
 add_test(test_low_level test_low_level)
-add_test(test_connection_other test_connection_other)
-add_test(test_connection_connect test_connection_connect)
-add_test(test_connection_push test_connection_push)
-add_test(test_connection_quit test_connection_quit)
-add_test(test_connection_quit_coalesce test_connection_quit_coalesce)
-add_test(test_connection_reconnect test_connection_reconnect)
-add_test(test_connection_tls test_connection_tls)
+add_test(test_conn_exec test_conn_exec)
+add_test(test_conn_push test_conn_push)
+add_test(test_conn_quit test_conn_quit)
+add_test(test_conn_quit_coalesce test_conn_quit_coalesce)
+add_test(test_conn_reconnect test_conn_reconnect)
+add_test(test_conn_tls test_conn_tls)
+add_test(test_conn_run_cancel test_conn_run_cancel)
+add_test(test_conn_exec_cancel test_conn_exec_cancel)
+add_test(test_conn_echo_stress test_conn_echo_stress)
+add_test(test_request test_request)
 
 # Install
 #=======================================================================
@@ -138,7 +179,6 @@ install(DIRECTORY ${PROJECT_SOURCE_DIR}/include/ DESTINATION include)
 #=======================================================================
 
 set(DOXYGEN_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/doc")
-
 configure_file(doc/Doxyfile.in doc/Doxyfile @ONLY)
 
 add_custom_target(

CMakePresets.json

@@ -51,7 +51,8 @@
         "CMAKE_CXX_FLAGS": "-Wall -Wextra -fsanitize=address",
         "CMAKE_SHARED_LINKER_FLAGS": "-fsanitize=address",
         "CMAKE_CXX_STANDARD_REQUIRED": "ON",
-        "PROJECT_BINARY_DIR": "${sourceDir}/build/dev"
+        "PROJECT_BINARY_DIR": "${sourceDir}/build/dev",
+        "DOXYGEN_OUTPUT_DIRECTORY": "${sourceDir}/build/dev/doc/"
       }
     },
     {

benchmarks/benchmarks.tex

@@ -24,7 +24,7 @@
     nodes near coords align={horizontal},
     ]
     \addplot coordinates {
-       (31.1,Asio)
+       (29.5,Asio)
        (30.7,Tokio)
        (35.6,Go)
        (43.6,Libuv)

benchmarks/cpp/asio/echo_server_client.cpp

@@ -6,6 +6,7 @@
 
 #include <iostream>
 #include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
 
 namespace net = boost::asio;
 
@@ -62,3 +63,6 @@ int main(int argc, char* argv[])
       std::cerr << e.what() << std::endl;
    }
 }
+#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
+auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 1;}
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

benchmarks/cpp/asio/echo_server_direct.cpp

@@ -9,7 +9,9 @@
 //
 
 #include <cstdio>
+#include <iostream>
 #include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
 
 namespace net = boost::asio;
 namespace this_coro = net::this_coro;
@@ -56,3 +58,6 @@ int main()
      std::printf("Exception: %s\n", e.what());
   }
 }
+#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
+auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 1;}
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

doc/Doxyfile.in

@@ -907,10 +907,7 @@ WARN_LOGFILE           =
 # spaces. See also FILE_PATTERNS and EXTENSION_MAPPING
 # Note: If this tag is empty the current directory is searched.
 
-INPUT                  = include \
-                         benchmarks/benchmarks.md \
-                         CHANGELOG.md \
-                         examples README.md
+INPUT                  = include examples README.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses

examples/chat_room.cpp

@@ -4,96 +4,67 @@
  * accompanying file LICENSE.txt)
  */
 
-#include <string>
-#include <iostream>
-#include "unistd.h"
-
 #include <boost/asio.hpp>
 #if defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
+#include <boost/asio/experimental/awaitable_operators.hpp>
 #include <aedis.hpp>
-#include "print.hpp"
+#include <unistd.h>
 
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using stream_descriptor = net::use_awaitable_t<>::as_default_on_t<net::posix::stream_descriptor>;
+using signal_set_type = net::use_awaitable_t<>::as_default_on_t<net::signal_set>;
 using aedis::adapt;
 using aedis::resp3::request;
 using aedis::resp3::node;
-using aedis::endpoint;
-using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
-using tcp_acceptor = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::acceptor>;
-using stream_descriptor = net::use_awaitable_t<>::as_default_on_t<net::posix::stream_descriptor>;
-using connection = aedis::connection<tcp_socket>;
-using stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
 
-// Chat over redis pubsub. To test, run this program from different
-// terminals and type messages to stdin. Use
-//
-//    $ redis-cli monitor
-//
-// to monitor the message traffic.
+// Chat over Redis pubsub. To test, run this program from different
+// terminals and type messages to stdin.
 
-// Receives messages from other users.
-net::awaitable<void> push_receiver(std::shared_ptr<connection> db)
+// Receives Redis server-side pushes.
+auto receiver(std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
    for (std::vector<node<std::string>> resp;;) {
-      co_await db->async_receive_push(adapt(resp));
-      print_push(resp);
+      co_await conn->async_receive(adapt(resp));
+      std::cout << resp.at(1).value << " " << resp.at(2).value << " " << resp.at(3).value << std::endl;
       resp.clear();
    }
 }
 
-// Subscribes to the channels when a new connection is stablished.
-net::awaitable<void> reconnect(std::shared_ptr<connection> db)
-{
-   request req;
-   req.push("SUBSCRIBE", "chat-channel");
-
-   stimer timer{co_await net::this_coro::executor};
-   endpoint ep{"127.0.0.1", "6379"};
-   for (;;) {
-      boost::system::error_code ec;
-      co_await db->async_run(ep, req, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
-      db->reset_stream();
-      std::cout << ec.message() << std::endl;
-      timer.expires_after(std::chrono::seconds{1});
-      co_await timer.async_wait();
-   }
-}
-
-// Publishes messages to other users.
-net::awaitable<void> publisher(stream_descriptor& in, std::shared_ptr<connection> db)
+// Publishes stdin messages to a Redis channel.
+auto publisher(std::shared_ptr<stream_descriptor> in, std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
    for (std::string msg;;) {
-      auto n = co_await net::async_read_until(in, net::dynamic_buffer(msg, 1024), "\n");
+      auto n = co_await net::async_read_until(*in, net::dynamic_buffer(msg, 1024), "\n");
       request req;
       req.push("PUBLISH", "chat-channel", msg);
-      co_await db->async_exec(req);
+      co_await conn->async_exec(req);
       msg.erase(0, n);
    }
 }
 
-auto main() -> int
+auto subscriber(std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
-   try {
-      net::io_context ioc{1};
-      stream_descriptor in{ioc, ::dup(STDIN_FILENO)};
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
+   req.push("SUBSCRIBE", "chat-channel");
 
-      auto db = std::make_shared<connection>(ioc);
-      co_spawn(ioc, publisher(in, db), net::detached);
-      co_spawn(ioc, push_receiver(db), net::detached);
-      co_spawn(ioc, reconnect(db), net::detached);
-
-      net::signal_set signals(ioc, SIGINT, SIGTERM);
-      signals.async_wait([&](auto, auto){ ioc.stop(); });
-
-      ioc.run();
-   } catch (std::exception const& e) {
-      std::cerr << e.what() << std::endl;
-   }
+   co_await conn->async_exec(req);
+}
+
+auto async_main() -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+   auto conn = std::make_shared<connection>(ex);
+   auto stream = std::make_shared<stream_descriptor>(ex, ::dup(STDIN_FILENO));
+   signal_set_type sig{ex, SIGINT, SIGTERM};
+
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await ((conn->async_run() || publisher(stream, conn) || receiver(conn) ||
+         healthy_checker(conn) || sig.async_wait()) && subscriber(conn));
 }
 
-#else // defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
-auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 1;}
 #endif // defined(BOOST_ASIO_HAS_CO_AWAIT) && defined(BOOST_ASIO_HAS_POSIX_STREAM_DESCRIPTOR)

examples/common.cpp

@@ -0,0 +1,94 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include "common.hpp"
+
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
+#include <iostream>
+
+namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using resolver = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::resolver>;
+using timer_type = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
+using aedis::resp3::request;
+using aedis::adapt;
+using aedis::operation;
+
+// Include this in no more than one .cpp file.
+#include <aedis/src.hpp>
+
+namespace
+{
+auto redir(boost::system::error_code& ec)
+   { return net::redirect_error(net::use_awaitable, ec); }
+}
+
+auto healthy_checker(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   try {
+      request req;
+      req.get_config().cancel_on_connection_lost = true;
+      req.push("PING");
+
+      timer_type timer{co_await net::this_coro::executor};
+
+      for (boost::system::error_code ec;;) {
+         timer.expires_after(std::chrono::seconds{1});
+         co_await (conn->async_exec(req, adapt()) || timer.async_wait(redir(ec)));
+
+         if (!ec) {
+            co_return;
+         }
+
+         // Waits some time before trying the next ping.
+         timer.expires_after(std::chrono::seconds{1});
+         co_await timer.async_wait();
+      }
+   } catch (...) {
+   }
+}
+
+auto
+connect(
+   std::shared_ptr<connection> conn,
+   std::string const& host,
+   std::string const& port) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+   resolver resv{ex};
+   timer_type timer{ex};
+
+   boost::system::error_code ec;
+   timer.expires_after(std::chrono::seconds{5});
+   auto const addrs = co_await (resv.async_resolve(host, port) || timer.async_wait(redir(ec)));
+   if (!ec)
+      throw std::runtime_error("Resolve timeout");
+
+   timer.expires_after(std::chrono::seconds{5});
+   co_await (net::async_connect(conn->next_layer(), std::get<0>(addrs)) || timer.async_wait(redir(ec)));
+   if (!ec)
+      throw std::runtime_error("Connect timeout");
+}
+
+extern net::awaitable<void> async_main();
+
+// Main function used in our examples.
+auto main() -> int
+{
+   try {
+      net::io_context ioc;
+      net::co_spawn(ioc, async_main(), net::detached);
+      ioc.run();
+   } catch (std::exception const& e) {
+      std::cerr << "Error: " << e.what() << std::endl;
+      return 1;
+   }
+}
+
+#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
+auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 0;}
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/common.hpp

@@ -0,0 +1,32 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#ifndef AEDIS_EXAMPLES_COMMON_HPP
+#define AEDIS_EXAMPLES_COMMON_HPP
+
+#include <boost/asio.hpp>
+#include <aedis.hpp>
+#include <memory>
+#include <iostream>
+#include <vector>
+#include <map>
+#include <set>
+#include <string>
+
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+
+using connection = boost::asio::use_awaitable_t<>::as_default_on_t<aedis::connection>;
+
+auto
+connect(
+   std::shared_ptr<connection> conn,
+   std::string const& host,
+   std::string const& port) -> boost::asio::awaitable<void>;
+
+auto healthy_checker(std::shared_ptr<connection> conn) -> boost::asio::awaitable<void>;
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
+#endif // AEDIS_EXAMPLES_COMMON_HPP

examples/containers.cpp

@@ -4,60 +4,108 @@
  * accompanying file LICENSE.txt)
  */
 
+#include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
+#include <aedis.hpp>
 #include <map>
 #include <vector>
-#include <iostream>
-#include <aedis.hpp>
-#include "print.hpp"
 
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
 using aedis::adapt;
 using aedis::resp3::request;
-using aedis::endpoint;
-using connection = aedis::connection<>;
 
-auto main() -> int
+void print(std::map<std::string, std::string> const& cont)
 {
-   try {
-      std::vector<int> vec{1, 2, 3, 4, 5, 6};
-
-      std::map<std::string, int> map{{"key1", 10}, {"key2", 20}, {"key3", 30}};
-
-      // Sends and retrieves containers in the same request for
-      // simplification.
-      request req;
-      req.push_range("RPUSH", "rpush-key", vec); // Sends
-      req.push_range("HSET", "hset-key", map); // Sends
-      req.push("MULTI");
-      req.push("LRANGE", "rpush-key", 0, -1); // Retrieves
-      req.push("HGETALL", "hset-key"); // Retrieves
-      req.push("EXEC");
-      req.push("QUIT");
-
-      std::tuple<
-         aedis::ignore, // rpush
-         aedis::ignore, // hset
-         aedis::ignore, // multi
-         aedis::ignore, // lrange
-         aedis::ignore, // hgetall
-         std::tuple<std::optional<std::vector<int>>, std::optional<std::map<std::string, int>>>, // exec
-         aedis::ignore  // quit
-      > resp;
-
-      net::io_context ioc;
-      connection db{ioc};
-      endpoint ep{"127.0.0.1", "6379"};
-      db.async_run(ep, req, adapt(resp), {}, [](auto ec, auto) {
-         std::cout << ec.message() << std::endl;
-      });
-      ioc.run();
-
-      print(std::get<0>(std::get<5>(resp)).value());
-      print(std::get<1>(std::get<5>(resp)).value());
-   } catch (...) {
-      std::cerr << "Error." << std::endl;
-   }
+   for (auto const& e: cont)
+      std::cout << e.first << ": " << e.second << "\n";
 }
+
+void print(std::vector<int> const& cont)
+{
+   for (auto const& e: cont) std::cout << e << " ";
+   std::cout << "\n";
+}
+
+// Stores the content of some STL containers in Redis.
+auto store(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   std::vector<int> vec
+      {1, 2, 3, 4, 5, 6};
+
+   std::map<std::string, std::string> map
+      {{"key1", "value1"}, {"key2", "value2"}, {"key3", "value3"}};
+
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
+   req.push_range("RPUSH", "rpush-key", vec);
+   req.push_range("HSET", "hset-key", map);
+   req.push("QUIT");
+
+   co_await conn->async_exec(req);
+}
+
+// Retrieves a Redis hash as an std::map.
+auto hgetall(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
+   req.push("HGETALL", "hset-key");
+   req.push("QUIT");
+
+   std::tuple<aedis::ignore, std::map<std::string, std::string>, aedis::ignore> resp;
+
+   co_await conn->async_exec(req, adapt(resp));
+
+   print(std::get<1>(resp));
+}
+
+// Retrieves in a transaction.
+auto transaction(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
+   req.push("MULTI");
+   req.push("LRANGE", "rpush-key", 0, -1); // Retrieves
+   req.push("HGETALL", "hset-key"); // Retrieves
+   req.push("EXEC");
+   req.push("QUIT");
+
+   std::tuple<
+      aedis::ignore, // hello
+      aedis::ignore, // multi
+      aedis::ignore, // lrange
+      aedis::ignore, // hgetall
+      std::tuple<std::optional<std::vector<int>>, std::optional<std::map<std::string, std::string>>>, // exec
+      aedis::ignore  // quit
+   > resp;
+
+   co_await conn->async_exec(req, adapt(resp));
+
+   print(std::get<0>(std::get<4>(resp)).value());
+   print(std::get<1>(std::get<4>(resp)).value());
+}
+
+net::awaitable<void> async_main()
+{
+   auto conn = std::make_shared<connection>(co_await net::this_coro::executor);
+
+   // Uses short-lived connections to store and retrieve the
+   // containers.
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await (conn->async_run() || store(conn));
+
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await (conn->async_run() || hgetall(conn));
+
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await (conn->async_run() || transaction(conn));
+}
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/echo_server.cpp

@@ -4,73 +4,58 @@
  * accompanying file LICENSE.txt)
  */
 
-#include <string>
-#include <iostream>
-
 #include <boost/asio.hpp>
 #if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
 #include <aedis.hpp>
-
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
+using tcp_acceptor = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::acceptor>;
+using signal_set_type = net::use_awaitable_t<>::as_default_on_t<net::signal_set>;
 using aedis::adapt;
 using aedis::resp3::request;
-using aedis::endpoint;
-using executor_type = net::io_context::executor_type;
-using socket_type = net::basic_stream_socket<net::ip::tcp, executor_type>;
-using tcp_socket = net::use_awaitable_t<executor_type>::as_default_on_t<socket_type>;
-using acceptor_type = net::basic_socket_acceptor<net::ip::tcp, executor_type>;
-using tcp_acceptor = net::use_awaitable_t<executor_type>::as_default_on_t<acceptor_type>;
-using awaitable_type = net::awaitable<void, executor_type>;
-using connection = aedis::connection<tcp_socket>;
 
-awaitable_type echo_loop(tcp_socket socket, std::shared_ptr<connection> db)
+auto echo_server_session(tcp_socket socket, std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
    request req;
-   std::tuple<std::string> resp;
+   std::string resp;
 
    for (std::string buffer;;) {
       auto n = co_await net::async_read_until(socket, net::dynamic_buffer(buffer, 1024), "\n");
       req.push("PING", buffer);
-      co_await db->async_exec(req, adapt(resp));
-      co_await net::async_write(socket, net::buffer(std::get<0>(resp)));
-      std::get<0>(resp).clear();
+      auto tmp = std::tie(resp);
+      co_await conn->async_exec(req, adapt(tmp));
+      co_await net::async_write(socket, net::buffer(resp));
+      resp.clear();
       req.clear();
       buffer.erase(0, n);
    }
 }
 
-awaitable_type listener(std::shared_ptr<connection> db)
+auto listener(std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
    auto ex = co_await net::this_coro::executor;
    tcp_acceptor acc(ex, {net::ip::tcp::v4(), 55555});
    for (;;)
-      net::co_spawn(ex, echo_loop(co_await acc.async_accept(), db), net::detached);
+      net::co_spawn(ex, echo_server_session(co_await acc.async_accept(), conn), net::detached);
 }
 
-auto main() -> int
+auto async_main() -> net::awaitable<void>
 {
-   try {
-      net::io_context ioc{BOOST_ASIO_CONCURRENCY_HINT_UNSAFE_IO};
-      auto db = std::make_shared<connection>(ioc);
-      endpoint ep{"127.0.0.1", "6379"};
-      db->async_run(ep, {}, [&](auto const& ec) {
-         std::clog << ec.message() << std::endl;
-         ioc.stop();
-      });
+   auto ex = co_await net::this_coro::executor;
+   auto conn = std::make_shared<connection>(ex);
+   signal_set_type sig{ex, SIGINT, SIGTERM};
 
-      net::signal_set signals(ioc, SIGINT, SIGTERM);
-      signals.async_wait([&](auto, auto){ ioc.stop(); });
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
 
-      co_spawn(ioc, listener(db), net::detached);
-      ioc.run();
-   } catch (std::exception const& e) {
-      std::cerr << e.what() << std::endl;
-   }
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await ((conn->async_run() || listener(conn) || healthy_checker(conn) ||
+            sig.async_wait()) && conn->async_exec(req));
 }
 
-#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
-auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 1;}
 #endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/intro.cpp

@@ -4,40 +4,32 @@
  * accompanying file LICENSE.txt)
  */
 
-#include <tuple>
-#include <string>
 #include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
 #include <aedis.hpp>
-
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
-
+using namespace net::experimental::awaitable_operators;
 using aedis::adapt;
 using aedis::resp3::request;
-using aedis::endpoint;
-using connection = aedis::connection<>;
 
-auto main() -> int
+net::awaitable<void> async_main()
 {
-   try {
-      net::io_context ioc;
-      connection db{ioc};
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
+   req.push("PING", "Hello world");
+   req.push("QUIT");
 
-      request req;
-      req.push("PING");
-      req.push("QUIT");
+   std::tuple<aedis::ignore, std::string, aedis::ignore> resp;
 
-      std::tuple<std::string, aedis::ignore> resp;
-      db.async_run({"127.0.0.1", "6379"}, req, adapt(resp), {}, [](auto ec, auto) {
-         std::cout << ec.message() << std::endl;
-      });
+   auto conn = std::make_shared<connection>(co_await net::this_coro::executor);
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await (conn->async_run() || conn->async_exec(req, adapt(resp)));
 
-      ioc.run();
-
-      std::cout << std::get<0>(resp) << std::endl;
-   } catch (...) {
-      std::cerr << "Error" << std::endl;
-   }
+   std::cout << "PING: " << std::get<1>(resp) << std::endl;
 }
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/intro_sync.cpp

@@ -10,13 +10,14 @@
 #include <boost/asio.hpp>
 #include <aedis.hpp>
 
+// TODO: Fix this after updating to 1.80.
+
 // Include this in no more than one .cpp file.
 #include <aedis/src.hpp>
 
 namespace net = boost::asio;
 using aedis::adapt;
 using aedis::resp3::request;
-using aedis::endpoint;
 using connection = aedis::connection<>;
 
 template <class Adapter>
@@ -38,11 +39,13 @@ int main()
 
       connection conn{ioc};
       std::thread t{[&]() {
-         conn.async_run({"127.0.0.1", "6379"}, {}, logger);
+         conn.async_run(logger);
          ioc.run();
       }};
 
       request req;
+      req.get_config().cancel_on_connection_lost = true;
+      req.push("HELLO", 3);
       req.push("PING");
       req.push("QUIT");
 

examples/intro_tls.cpp

@@ -6,50 +6,54 @@
 
 #include <tuple>
 #include <string>
+#include <iostream>
+
 #include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
 #include <boost/asio/ssl.hpp>
+
 #include <aedis.hpp>
 #include <aedis/ssl/connection.hpp>
 
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
-
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using resolver = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::resolver>;
 using aedis::adapt;
 using aedis::resp3::request;
-using aedis::endpoint;
-using connection = aedis::ssl::connection<net::ssl::stream<net::ip::tcp::socket>>;
+using connection = net::use_awaitable_t<>::as_default_on_t<aedis::ssl::connection>;
 
-bool verify_certificate(bool, net::ssl::verify_context&)
+auto verify_certificate(bool, net::ssl::verify_context&) -> bool
 {
    std::cout << "set_verify_callback" << std::endl;
    return true;
 }
 
-auto main() -> int
+net::awaitable<void> async_main()
 {
-   try {
-      net::io_context ioc;
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3, "AUTH", "aedis", "aedis");
+   req.push("PING");
+   req.push("QUIT");
 
-      net::ssl::context ctx{net::ssl::context::sslv23};
+   std::tuple<aedis::ignore, std::string, aedis::ignore> resp;
 
-      connection conn{ioc, ctx};
-      conn.next_layer().set_verify_mode(net::ssl::verify_peer);
-      conn.next_layer().set_verify_callback(verify_certificate);
+   // Resolve
+   auto ex = co_await net::this_coro::executor;
+   resolver resv{ex};
+   auto const endpoints = co_await resv.async_resolve("db.occase.de", "6380");
 
-      request req;
-      req.push("PING");
-      req.push("QUIT");
+   net::ssl::context ctx{net::ssl::context::sslv23};
+   connection conn{ex, ctx};
+   conn.next_layer().set_verify_mode(net::ssl::verify_peer);
+   conn.next_layer().set_verify_callback(verify_certificate);
 
-      std::tuple<std::string, aedis::ignore> resp;
-      conn.async_run({"127.0.0.1", "6379"}, req, adapt(resp), {}, [&](auto ec, auto) {
-         std::cout << ec.message() << std::endl;
-      });
+   co_await net::async_connect(conn.lowest_layer(), endpoints);
+   co_await conn.next_layer().async_handshake(net::ssl::stream_base::client);
+   co_await (conn.async_run() || conn.async_exec(req, adapt(resp)));
 
-      ioc.run();
-
-      std::cout << "Response: " << std::get<0>(resp) << std::endl;
-   } catch (std::exception const& e) {
-      std::cerr << "Error: " << e.what() << std::endl;
-   }
+   std::cout << "Response: " << std::get<1>(resp) << std::endl;
 }
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/low_level_async.cpp

@@ -0,0 +1,63 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <string>
+#include <iostream>
+
+#include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+
+namespace net = boost::asio;
+namespace resp3 = aedis::resp3;
+using endpoints = net::ip::tcp::resolver::results_type;
+using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
+using aedis::resp3::request;
+using aedis::adapter::adapt2;
+using net::ip::tcp;
+
+net::awaitable<void> ping(endpoints const& addrs)
+{
+   tcp_socket socket{co_await net::this_coro::executor};
+   net::connect(socket, addrs);
+
+   // Creates the request and writes to the socket.
+   request req;
+   req.push("HELLO", 3);
+   req.push("PING");
+   req.push("QUIT");
+   co_await resp3::async_write(socket, req);
+
+   // Responses
+   std::string buffer, resp;
+
+   // Reads the responses to all commands in the request.
+   auto dbuffer = net::dynamic_buffer(buffer);
+   co_await resp3::async_read(socket, dbuffer);
+   co_await resp3::async_read(socket, dbuffer, adapt2(resp));
+   co_await resp3::async_read(socket, dbuffer);
+
+   std::cout << "Ping: " << resp << std::endl;
+}
+
+int main()
+{
+   try {
+      net::io_context ioc;
+      net::ip::tcp::resolver resv{ioc};
+      auto const addrs = resv.resolve("127.0.0.1", "6379");
+      net::co_spawn(ioc, ping(addrs), net::detached);
+      ioc.run();
+   } catch (std::exception const& e) {
+      std::cerr << "Error: " << e.what() << std::endl;
+   }
+}
+
+#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
+auto main() -> int {std::cout << "Requires coroutine support." << std::endl; return 0;}
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/print.hpp

@@ -1,65 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <map>
-#include <set>
-#include <vector>
-#include <string>
-#include <iostream>
-
-#include <aedis/resp3/type.hpp>
-#include <aedis/resp3/node.hpp>
-
-// Some functions to make the examples less repetitive.
-
-namespace net = boost::asio;
-using aedis::resp3::node;
-
-void print_aggr(std::vector<aedis::resp3::node<std::string>>& v)
-{
-   if (std::empty(v))
-      return;
-
-   auto const m = aedis::resp3::element_multiplicity(v.front().data_type);
-   for (auto i = 0lu; i < m * v.front().aggregate_size; ++i)
-      std::cout << v[i + 1].value << " ";
-   std::cout << "\n";
-   v.clear();
-}
-
-template <class T>
-void print(std::vector<T> const& cont)
-{
-   for (auto const& e: cont) std::cout << e << " ";
-   std::cout << "\n";
-}
-
-template <class T>
-void print(std::set<T> const& cont)
-{
-   for (auto const& e: cont) std::cout << e << "\n";
-}
-
-template <class T, class U>
-void print(std::map<T, U> const& cont)
-{
-   for (auto const& e: cont)
-      std::cout << e.first << ": " << e.second << "\n";
-}
-
-void print(std::string const& e)
-{
-   std::cout << e << std::endl;
-}
-
-void print_push(std::vector<aedis::resp3::node<std::string>>& resp)
-{
-   std::cout
-      << "Push type: "   << resp.at(1).value << "\n"
-      << "Channel: " << resp.at(2).value << "\n"
-      << "Message: " << resp.at(3).value << "\n"
-      << std::endl;
-}

examples/resolve_with_sentinel.cpp

@@ -0,0 +1,70 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
+#include <aedis.hpp>
+#include "common.hpp"
+
+namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using endpoints = net::ip::tcp::resolver::results_type;
+using aedis::adapt;
+using aedis::resp3::request;
+
+auto redir(boost::system::error_code& ec)
+   { return net::redirect_error(net::use_awaitable, ec); }
+
+struct endpoint {
+   std::string host;
+   std::string port;
+};
+
+// For more info see
+// - https://redis.io/docs/manual/sentinel.
+// - https://redis.io/docs/reference/sentinel-clients.
+auto resolve_master_address(std::vector<endpoint> const& endpoints) -> net::awaitable<endpoint>
+{
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("SENTINEL", "get-master-addr-by-name", "mymaster");
+   req.push("QUIT");
+
+   auto conn = std::make_shared<connection>(co_await net::this_coro::executor);
+
+   std::tuple<std::optional<std::array<std::string, 2>>, aedis::ignore> addr;
+   for (auto ep : endpoints) {
+      boost::system::error_code ec;
+      co_await connect(conn, ep.host, ep.port);
+      co_await (conn->async_run() && conn->async_exec(req, adapt(addr), redir(ec)));
+      conn->reset_stream();
+      if (std::get<0>(addr))
+         co_return endpoint{std::get<0>(addr).value().at(0), std::get<0>(addr).value().at(1)};
+   }
+
+   co_return endpoint{};
+}
+
+auto async_main() -> net::awaitable<void>
+{
+   // A list of sentinel addresses from which only one is responsive
+   // to simulate sentinels that are down.
+   std::vector<endpoint> const endpoints
+   { {"foo", "26379"}
+   , {"bar", "26379"}
+   , {"127.0.0.1", "26379"}
+   };
+
+   auto const ep = co_await resolve_master_address(endpoints);
+
+   std::clog
+      << "Host: " << ep.host << "\n"
+      << "Port: " << ep.port << "\n"
+      << std::flush;
+}
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/serialization.cpp

@@ -4,25 +4,26 @@
  * accompanying file LICENSE.txt)
  */
 
+#include <boost/asio.hpp>
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
+#include <boost/json.hpp>
+#include <aedis.hpp>
+#include "common.hpp"
 #include <algorithm>
 #include <cstdint>
 #include <iostream>
 #include <set>
 #include <iterator>
 #include <string>
-#include <boost/json.hpp>
-#include <boost/json/src.hpp>
-#include <aedis.hpp>
-#include "print.hpp"
 
 // Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include <boost/json/src.hpp>
 
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
 using aedis::resp3::request;
 using aedis::adapt;
-using aedis::endpoint;
-using connection = aedis::connection<>;
 using namespace boost::json;
 
 struct user {
@@ -43,21 +44,21 @@ void tag_invoke(value_from_tag, value& jv, user const& u)
 template<class T>
 void extract(object const& obj, T& t, boost::string_view key)
 {
-    t = value_to<T>(obj.at(key));
+   t = value_to<T>(obj.at(key));
 }
 
-user tag_invoke(value_to_tag<user>, value const& jv)
+auto tag_invoke(value_to_tag<user>, value const& jv)
 {
-    user u;
-    object const& obj = jv.as_object();
-    extract(obj, u.name, "name");
-    extract(obj, u.age, "age");
-    extract(obj, u.country, "country");
-    return u;
+   user u;
+   object const& obj = jv.as_object();
+   extract(obj, u.name, "name");
+   extract(obj, u.age, "age");
+   extract(obj, u.country, "country");
+   return u;
 }
 
 // Serializes
-void to_bulk(std::string& to, user const& u)
+void to_bulk(std::pmr::string& to, user const& u)
 {
    aedis::resp3::to_bulk(to, serialize(value_from(u)));
 }
@@ -69,7 +70,7 @@ void from_bulk(user& u, boost::string_view sv, boost::system::error_code&)
    u = value_to<user>(jv);
 }
 
-std::ostream& operator<<(std::ostream& os, user const& u)
+auto operator<<(std::ostream& os, user const& u) -> std::ostream&
 {
    os << "Name: " << u.name << "\n"
       << "Age: " << u.age << "\n"
@@ -78,20 +79,18 @@ std::ostream& operator<<(std::ostream& os, user const& u)
    return os;
 }
 
-bool operator<(user const& a, user const& b)
+auto operator<(user const& a, user const& b)
 {
    return std::tie(a.name, a.age, a.country) < std::tie(b.name, b.age, b.country);
 }
 
-int main()
+net::awaitable<void> async_main()
 {
-   net::io_context ioc;
-   connection db{ioc};
-
    std::set<user> users
       {{"Joao", "58", "Brazil"} , {"Serge", "60", "France"}};
 
    request req;
+   req.get_config().cancel_on_connection_lost = true;
    req.push("HELLO", 3);
    req.push_range("SADD", "sadd-key", users); // Sends
    req.push("SMEMBERS", "sadd-key"); // Retrieves
@@ -99,13 +98,12 @@ int main()
 
    std::tuple<aedis::ignore, int, std::set<user>, std::string> resp;
 
-   endpoint ep{"127.0.0.1", "6379"};
-   db.async_run(ep, req, adapt(resp), {}, [](auto ec, auto) {
-      std::cout << ec.message() << std::endl;
-   });
+   auto conn = std::make_shared<connection>(co_await net::this_coro::executor);
+   co_await connect(conn, "127.0.0.1", "6379");
+   co_await (conn->async_run() || conn->async_exec(req, adapt(resp)));
 
-   ioc.run();
-
-   // Print
-   print(std::get<2>(resp));
+   for (auto const& e: std::get<2>(resp))
+      std::cout << e << "\n";
 }
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/subscriber.cpp

@@ -4,27 +4,21 @@
  * accompanying file LICENSE.txt)
  */
 
-#include <string>
-#include <vector>
-#include <iostream>
-#include <tuple>
-
 #include <boost/asio.hpp>
 #if defined(BOOST_ASIO_HAS_CO_AWAIT)
+#include <boost/asio/experimental/awaitable_operators.hpp>
 #include <aedis.hpp>
-#include "print.hpp"
 
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
+using namespace net::experimental::awaitable_operators;
+using resolver = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::resolver>;
+using signal_set_type = net::use_awaitable_t<>::as_default_on_t<net::signal_set>;
+using timer_type = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
 using aedis::adapt;
 using aedis::resp3::request;
 using aedis::resp3::node;
-using aedis::endpoint;
-using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
-using stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
-using connection = aedis::connection<tcp_socket>;
 
 /* This example will subscribe and read pushes indefinitely.
  *
@@ -43,53 +37,36 @@ using connection = aedis::connection<tcp_socket>;
  */
 
 // Receives pushes.
-net::awaitable<void> push_receiver(std::shared_ptr<connection> db)
+auto receiver(std::shared_ptr<connection> conn) -> net::awaitable<void>
 {
    for (std::vector<node<std::string>> resp;;) {
-      co_await db->async_receive_push(adapt(resp));
-      print_push(resp);
+      co_await conn->async_receive(adapt(resp));
+      std::cout << resp.at(1).value << " " << resp.at(2).value << " " << resp.at(3).value << std::endl;
       resp.clear();
    }
 }
 
-// See
-// - https://redis.io/docs/manual/sentinel.
-// - https://redis.io/docs/reference/sentinel-clients.
-net::awaitable<void> reconnect(std::shared_ptr<connection> db)
+auto async_main() -> net::awaitable<void>
 {
+   auto ex = co_await net::this_coro::executor;
+   auto conn = std::make_shared<connection>(ex);
+   signal_set_type sig{ex, SIGINT, SIGTERM};
+   timer_type timer{ex};
+
    request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3);
    req.push("SUBSCRIBE", "channel");
 
-   stimer timer{co_await net::this_coro::executor};
-   endpoint ep{"127.0.0.1", "6379"};
+   // The loop will reconnect on connection lost. To exit type Ctrl-C twice.
    for (;;) {
-      boost::system::error_code ec;
-      co_await db->async_run(ep, req, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
-      db->reset_stream();
-      std::cout << ec.message() << std::endl;
+      co_await connect(conn, "127.0.0.1", "6379");
+      co_await ((conn->async_run() || healthy_checker(conn) || sig.async_wait() ||
+               receiver(conn)) && conn->async_exec(req));
+      conn->reset_stream();
       timer.expires_after(std::chrono::seconds{1});
       co_await timer.async_wait();
    }
 }
 
-int main()
-{
-   try {
-      net::io_context ioc;
-      auto db = std::make_shared<connection>(ioc);
-
-      net::co_spawn(ioc, push_receiver(db), net::detached);
-      net::co_spawn(ioc, reconnect(db), net::detached);
-
-      net::signal_set signals(ioc, SIGINT, SIGTERM);
-      signals.async_wait([&](auto, auto){ ioc.stop(); });
-
-      ioc.run();
-   } catch (std::exception const& e) {
-      std::cerr << "Error: " << e.what() << std::endl;
-   }
-}
-
-#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
-int main() {std::cout << "Requires coroutine support." << std::endl; return 1;}
 #endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

examples/subscriber_sentinel.cpp

@@ -1,119 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <string>
-#include <vector>
-#include <iostream>
-#include <tuple>
-
-#include <boost/asio.hpp>
-#if defined(BOOST_ASIO_HAS_CO_AWAIT)
-#include <aedis.hpp>
-#include "print.hpp"
-
-// Include this in no more than one .cpp file.
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-using aedis::adapt;
-using aedis::resp3::request;
-using aedis::resp3::node;
-using aedis::endpoint;
-using tcp_socket = net::use_awaitable_t<>::as_default_on_t<net::ip::tcp::socket>;
-using stimer = net::use_awaitable_t<>::as_default_on_t<net::steady_timer>;
-using connection = aedis::connection<tcp_socket>;
-
-// Connects to a Redis instance over sentinel and performs failover in
-// case of disconnection, see
-// https://redis.io/docs/reference/sentinel-clients.  This example
-// assumes a sentinel and a redis server running on localhost.
-
-net::awaitable<void> receive_pushes(std::shared_ptr<connection> db)
-{
-   for (std::vector<node<std::string>> resp;;) {
-      co_await db->async_receive_push(adapt(resp));
-      print_push(resp);
-      resp.clear();
-   }
-}
-
-net::awaitable<endpoint> resolve()
-{
-   // A list of sentinel addresses from which only one is responsive
-   // to simulate sentinels that are down.
-   std::vector<endpoint> const endpoints
-   { {"foo", "26379"}
-   , {"bar", "26379"}
-   , {"127.0.0.1", "26379"}
-   };
-
-   request req1;
-   req1.push("SENTINEL", "get-master-addr-by-name", "mymaster");
-   req1.push("QUIT");
-
-   auto ex = co_await net::this_coro::executor;
-   connection conn{ex};
-
-   std::tuple<std::optional<std::array<std::string, 2>>, aedis::ignore> addr;
-   for (auto ep : endpoints) {
-      boost::system::error_code ec;
-      co_await conn.async_run(ep, req1, adapt(addr), {}, net::redirect_error(net::use_awaitable, ec));
-      conn.reset_stream();
-      std::cout << ec.message() << std::endl;
-      if (std::get<0>(addr))
-         break;
-   }
-
-   endpoint ep;
-   if (std::get<0>(addr)) {
-      ep.host = std::get<0>(addr).value().at(0);
-      ep.port = std::get<0>(addr).value().at(1);
-   }
-
-   co_return ep;
-}
-
-net::awaitable<void> reconnect(std::shared_ptr<connection> db)
-{
-   request req2;
-   req2.push("SUBSCRIBE", "channel");
-
-   auto ex = co_await net::this_coro::executor;
-   stimer timer{ex};
-   for (;;) {
-      auto ep = co_await net::co_spawn(ex, resolve(), net::use_awaitable);
-      if (!aedis::is_valid(ep)) {
-         std::clog << "Can't resolve master name" << std::endl;
-         co_return;
-      }
-
-      boost::system::error_code ec;
-      co_await db->async_run(ep, req2, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
-      std::cout << ec.message() << std::endl;
-      std::cout << "Starting the failover." << std::endl;
-      timer.expires_after(std::chrono::seconds{1});
-      co_await timer.async_wait();
-   }
-}
-
-int main()
-{
-   try {
-      net::io_context ioc;
-      auto db = std::make_shared<connection>(ioc);
-      net::co_spawn(ioc, receive_pushes(db), net::detached);
-      net::co_spawn(ioc, reconnect(db), net::detached);
-      net::signal_set signals(ioc, SIGINT, SIGTERM);
-      signals.async_wait([&](auto, auto){ ioc.stop(); });
-      ioc.run();
-   } catch (std::exception const& e) {
-      std::cerr << "Error: " << e.what() << std::endl;
-   }
-}
-
-#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
-int main() {std::cout << "Requires coroutine support." << std::endl; return 1;}
-#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)

include/aedis/adapt.hpp

@@ -204,8 +204,13 @@ inline auto adapt(std::size_t max_read_size = (std::numeric_limits<std::size_t>:
 /** @brief Adapts a type to be used as a response.
  *  @ingroup high-level-api
  *
- *  The type T can be any STL container, any integer type and
- *  \c std::string
+ *  The type T must be either
+ *
+ *  1. a std::tuple<T1, T2, T3, ...> or
+ *  2. std::vector<node<String>>
+ *
+ *  The types T1, T2, etc can be any STL container, any integer type
+ *  and \c std::string
  *
  *  @param t Tuple containing the responses.
  *  @param max_read_size Specifies the maximum size of the read

include/aedis/adapter/detail/adapters.hpp

@@ -49,11 +49,10 @@ auto parse_double(
 // Serialization.
 
 template <class T>
-typename std::enable_if<std::is_integral<T>::value, void>::type
-from_bulk(
+auto from_bulk(
    T& i,
    boost::string_view sv,
-   boost::system::error_code& ec)
+   boost::system::error_code& ec) -> typename std::enable_if<std::is_integral<T>::value, void>::type
 {
    i = resp3::detail::parse_uint(sv.data(), sv.size(), ec);
 }
@@ -106,10 +105,9 @@ private:
 
 public:
    explicit general_aggregate(Result* c = nullptr): result_(c) {}
-   void operator()(resp3::node<boost::string_view> const& n, boost::system::error_code& ec)
+   void operator()(resp3::node<boost::string_view> const& n, boost::system::error_code&)
    {
       result_->push_back({n.data_type, n.aggregate_size, n.depth, std::string{std::cbegin(n.value), std::cend(n.value)}});
-      set_on_resp3_error(n.data_type, ec);
    }
 };
 

include/aedis/adapter/detail/response_traits.hpp

@@ -20,7 +20,7 @@
 
 namespace aedis::adapter::detail {
 
-struct ignore {};
+using ignore = std::decay_t<decltype(std::ignore)>;
 
 /* Traits class for response objects.
  *
@@ -29,18 +29,15 @@ struct ignore {};
  */
 template <class ResponseType>
 struct response_traits {
-   using adapter_type = adapter::detail::wrapper<ResponseType>;
+   using adapter_type = adapter::detail::wrapper<typename std::decay<ResponseType>::type>;
    static auto adapt(ResponseType& r) noexcept { return adapter_type{&r}; }
 };
 
-template <class T>
-using adapter_t = typename response_traits<T>::adapter_type;
-
 template <>
 struct response_traits<ignore> {
    using response_type = ignore;
    using adapter_type = resp3::detail::ignore_response;
-   static auto adapt(response_type&) noexcept { return adapter_type{}; }
+   static auto adapt(response_type) noexcept { return adapter_type{}; }
 };
 
 template <class T>
@@ -64,10 +61,13 @@ struct response_traits<void> {
    static auto adapt() noexcept { return adapter_type{}; }
 };
 
+template <class T>
+using adapter_t = typename response_traits<std::decay_t<T>>::adapter_type;
+
 // Duplicated here to avoid circular include dependency.
 template<class T>
 auto internal_adapt(T& t) noexcept
-   { return response_traits<T>::adapt(t); }
+   { return response_traits<std::decay_t<T>>::adapt(t); }
 
 template <std::size_t N>
 struct assigner {

include/aedis/connection.hpp

@@ -22,50 +22,45 @@ namespace aedis {
  *  commands can be sent at any time. For more details, please see the
  *  documentation of each individual function.
  *
- *  @remarks This class exposes only asynchronous member functions,
- *  synchronous communications with the Redis server is provided by
- *  the `aedis::sync` class.
- *
- *  @tparam Derived class.
- *
+ *  @tparam AsyncReadWriteStream A stream that supports reading and
+ *  writing.
  */
-template <class AsyncReadWriteStream = boost::asio::ip::tcp::socket>
-class connection :
+template <class AsyncReadWriteStream>
+class basic_connection :
    private detail::connection_base<
       typename AsyncReadWriteStream::executor_type,
-      connection<AsyncReadWriteStream>> {
+      basic_connection<AsyncReadWriteStream>> {
 public:
    /// Executor type.
    using executor_type = typename AsyncReadWriteStream::executor_type;
 
    /// Type of the next layer
    using next_layer_type = AsyncReadWriteStream;
-   using base_type = detail::connection_base<executor_type, connection<AsyncReadWriteStream>>;
 
-   /** \brief Connection configuration parameters.
-    */
-   struct timeouts {
-      /// Timeout of the resolve operation.
-      std::chrono::steady_clock::duration resolve_timeout = std::chrono::seconds{10};
-
-      /// Timeout of the connect operation.
-      std::chrono::steady_clock::duration connect_timeout = std::chrono::seconds{10};
-
-      /// Timeout of the resp3 handshake operation.
-      std::chrono::steady_clock::duration resp3_handshake_timeout = std::chrono::seconds{2};
-
-      /// Time interval of ping operations.
-      std::chrono::steady_clock::duration ping_interval = std::chrono::seconds{1};
+   /// Rebinds the socket type to another executor.
+   template <class Executor1>
+   struct rebind_executor
+   {
+      /// The socket type when rebound to the specified executor.
+      using other = basic_connection<typename next_layer_type::template rebind_executor<Executor1>::other>;
    };
 
+   using base_type = detail::connection_base<executor_type, basic_connection<AsyncReadWriteStream>>;
+
    /// Constructor
-   explicit connection(executor_type ex)
-   : base_type{ex}
+   explicit
+   basic_connection(
+      executor_type ex,
+      std::pmr::memory_resource* resource = std::pmr::get_default_resource())
+   : base_type{ex, resource}
    , stream_{ex}
    {}
 
-   explicit connection(boost::asio::io_context& ioc)
-   : connection(ioc.get_executor())
+   explicit
+   basic_connection(
+      boost::asio::io_context& ioc,
+      std::pmr::memory_resource* resource = std::pmr::get_default_resource())
+   : basic_connection(ioc.get_executor(), resource)
    { }
 
    /// Returns the associated executor.
@@ -87,46 +82,12 @@ public:
    /// Returns a const reference to the next layer.
    auto next_layer() const noexcept -> auto const& { return stream_; }
 
-   /** @brief Starts communication with the Redis server asynchronously.
+   /** @brief Establishes a connection with the Redis server asynchronously.
     *
-    *  This function performs the following steps
+    *  This function will start reading from the socket and executes
+    *  all requests that have been started prior to this function
+    *  call.
     *
-    *  @li Resolves the Redis host as of `async_resolve` with the
-    *  timeout passed in the base class `connection::timeouts::resolve_timeout`.
-    *
-    *  @li Connects to one of the endpoints returned by the resolve
-    *  operation with the timeout passed in the base class
-    *  `connection::timeouts::connect_timeout`.
-    *
-    *  @li Performs a RESP3 handshake by sending a
-    *  [HELLO](https://redis.io/commands/hello/) command with protocol
-    *  version 3 and the credentials contained in the
-    *  `aedis::endpoint` object.  The timeout used is the one specified
-    *  in `connection::timeouts::resp3_handshake_timeout`.
-    *
-    *  @li Erases any password that may be contained in
-    *  `endpoint::password`.
-    *
-    *  @li Checks whether the server role corresponds to the one
-    *  specifed in the `endpoint`. If `endpoint::role` is left empty,
-    *  no check is performed. If the role role is different than the
-    *  expected `async_run` will complete with
-    *  `error::unexpected_server_role`.
-    *
-    *  @li Starts healthy checks with a timeout twice the value of
-    *  `connection::timeouts::ping_interval`. If no data is received during that
-    *  time interval `connection::async_run` completes with
-    *  `error::idle_timeout`.
-    *
-    *  @li Starts the healthy check operation that sends the
-    *  [PING](https://redis.io/commands/ping/) to Redis with a
-    *  frequency equal to `connection::timeouts::ping_interval`.
-    *
-    *  @li Starts reading from the socket and executes all requests
-    *  that have been started prior to this function call.
-    *
-    *  @param ep Redis endpoint.
-    *  @param ts Timeouts used by the operations.
     *  @param token Completion token.
     *
     *  The completion token must have the following signature
@@ -134,48 +95,15 @@ public:
     *  @code
     *  void f(boost::system::error_code);
     *  @endcode
+    *
+    *  This function will complete when the connection is lost as
+    *  follows. If the error is boost::asio::error::eof this function
+    *  will complete without error.
     */
    template <class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto
-   async_run(
-      endpoint ep,
-      timeouts ts = timeouts{},
-      CompletionToken token = CompletionToken{})
+   auto async_run(CompletionToken token = CompletionToken{})
    {
-      return base_type::async_run(ep, ts, std::move(token));
-   }
-
-   /** @brief Connects and executes a request asynchronously.
-    *
-    *  Combines the other `async_run` overload with `async_exec` in a
-    *  single function. This function is useful for users that want to
-    *  send a single request to the server and close it.
-    *
-    *  @param ep Redis endpoint.
-    *  @param req Request object.
-    *  @param adapter Response adapter.
-    *  @param ts Timeouts used by the operation.
-    *  @param token Asio completion token.
-    *
-    *  The completion token must have the following signature
-    *
-    *  @code
-    *  void f(boost::system::error_code, std::size_t);
-    *  @endcode
-    *
-    *  Where the second parameter is the size of the response in bytes.
-    */
-   template <
-      class Adapter = detail::response_traits<void>::adapter_type,
-      class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto async_run(
-      endpoint ep,
-      resp3::request const& req,
-      Adapter adapter,
-      timeouts ts,
-      CompletionToken token = CompletionToken{})
-   {
-      return base_type::async_run(ep, req, adapter, ts, std::move(token));
+      return base_type::async_run(std::move(token));
    }
 
    /** @brief Executes a command on the Redis server asynchronously.
@@ -234,18 +162,18 @@ public:
    template <
       class Adapter = detail::response_traits<void>::adapter_type,
       class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto async_receive_push(
+   auto async_receive(
       Adapter adapter = adapt(),
       CompletionToken token = CompletionToken{})
    {
-      return base_type::async_receive_push(adapter, std::move(token));
+      return base_type::async_receive(adapter, std::move(token));
    }
 
    /** @brief Cancel operations.
     *
     *  @li `operation::exec`: Cancels operations started with
-    *  `async_exec`. Has precedence over
-    *  `request::config::close_on_connection_lost`
+    *  `async_exec`. Affects only requests that haven't been written
+    *  yet.
     *  @li operation::run: Cancels the `async_run` operation. Notice
     *  that the preferred way to close a connection is to send a
     *  [QUIT](https://redis.io/commands/quit/) command to the server.
@@ -253,8 +181,8 @@ public:
     *  timeout and lead to `connection::async_run` completing with
     *  `error::idle_timeout`.  Calling `cancel(operation::run)`
     *  directly should be seen as the last option.
-    *  @li operation::receive_push: Cancels any ongoing callto
-    *  `async_receive_push`.
+    *  @li operation::receive: Cancels any ongoing callto
+    *  `async_receive`.
     *
     *  @param op: The operation to be cancelled.
     *  @returns The number of operations that have been canceled.
@@ -263,41 +191,28 @@ public:
       { return base_type::cancel(op); }
 
 private:
-   using this_type = connection<next_layer_type>;
+   using this_type = basic_connection<next_layer_type>;
 
    template <class, class> friend class detail::connection_base;
    template <class, class> friend struct detail::exec_read_op;
    template <class, class> friend struct detail::exec_op;
-   template <class, class> friend struct detail::receive_push_op;
-   template <class> friend struct detail::check_idle_op;
+   template <class, class> friend struct detail::receive_op;
    template <class> friend struct detail::reader_op;
    template <class> friend struct detail::writer_op;
-   template <class, class> friend struct detail::connect_with_timeout_op;
-   template <class, class> friend struct detail::run_op;
-   template <class> friend struct detail::ping_op;
-
-   template <class Timer, class CompletionToken>
-   auto
-   async_connect(
-      boost::asio::ip::tcp::resolver::results_type const& endpoints,
-      timeouts ts,
-      Timer& timer,
-      CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::connect_with_timeout_op<this_type, Timer>{this, &endpoints, ts, &timer},
-               token, stream_);
-   }
+   template <class> friend struct detail::run_op;
 
    void close() { stream_.close(); }
    auto is_open() const noexcept { return stream_.is_open(); }
-   auto& lowest_layer() noexcept { return stream_.lowest_layer(); }
+   auto lowest_layer() noexcept -> auto& { return stream_.lowest_layer(); }
 
    AsyncReadWriteStream stream_;
 };
 
+/** \brief A connection that uses a boost::asio::ip::tcp::socket.
+ *  \ingroup high-level-api
+ */
+using connection = basic_connection<boost::asio::ip::tcp::socket>;
+
 } // aedis
 
 #endif // AEDIS_CONNECTION_HPP

include/aedis/detail/connection_base.hpp

@@ -13,6 +13,7 @@
 #include <chrono>
 #include <memory>
 #include <type_traits>
+#include <memory_resource>
 
 #include <boost/assert.hpp>
 #include <boost/asio/ip/tcp.hpp>
@@ -22,7 +23,6 @@
 
 #include <aedis/adapt.hpp>
 #include <aedis/operation.hpp>
-#include <aedis/endpoint.hpp>
 #include <aedis/resp3/request.hpp>
 #include <aedis/detail/connection_ops.hpp>
 
@@ -43,60 +43,38 @@ public:
    using executor_type = Executor;
    using this_type = connection_base<Executor, Derived>;
 
-   explicit connection_base(executor_type ex)
-   : resv_{ex}
-   , ping_timer_{ex}
-   , check_idle_timer_{ex}
-   , writer_timer_{ex}
+   explicit
+   connection_base(executor_type ex, std::pmr::memory_resource* resource)
+   : writer_timer_{ex}
    , read_timer_{ex}
    , push_channel_{ex}
-   , last_data_{std::chrono::time_point<std::chrono::steady_clock>::min()}
-   , req_{{true}}
+   , read_buffer_{resource}
+   , write_buffer_{resource}
+   , reqs_{resource}
    {
       writer_timer_.expires_at(std::chrono::steady_clock::time_point::max());
       read_timer_.expires_at(std::chrono::steady_clock::time_point::max());
    }
 
-   auto get_executor() {return resv_.get_executor();}
+   auto get_executor() {return writer_timer_.get_executor();}
 
    auto cancel(operation op) -> std::size_t
    {
       switch (op) {
          case operation::exec:
          {
-            for (auto& e: reqs_) {
-               e->stop = true;
-               e->timer.cancel_one();
-            }
-
-            auto const ret = reqs_.size();
-            reqs_ = {};
-            return ret;
+            return cancel_unwritten_requests();
          }
          case operation::run:
          {
-            resv_.cancel();
             derived().close();
-
             read_timer_.cancel();
-            check_idle_timer_.cancel();
             writer_timer_.cancel();
-            ping_timer_.cancel();
+            cancel_on_conn_lost();
 
-            auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
-               return !ptr->req->get_config().close_on_connection_lost;
-            });
-
-            // Cancel own pings if there are any waiting.
-            std::for_each(point, std::end(reqs_), [](auto const& ptr) {
-               ptr->stop = true;
-               ptr->timer.cancel();
-            });
-
-            reqs_.erase(point, std::end(reqs_));
             return 1U;
          }
-         case operation::receive_push:
+         case operation::receive:
          {
             push_channel_.cancel();
             return 1U;
@@ -105,6 +83,53 @@ public:
       }
    }
 
+   auto cancel_unwritten_requests() -> std::size_t
+   {
+      auto f = [](auto const& ptr)
+      {
+         BOOST_ASSERT(ptr != nullptr);
+         return ptr->is_written();
+      };
+
+      auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), f);
+
+      auto const ret = std::distance(point, std::end(reqs_));
+
+      std::for_each(point, std::end(reqs_), [](auto const& ptr) {
+         ptr->stop();
+      });
+
+      reqs_.erase(point, std::end(reqs_));
+      return ret;
+   }
+
+   auto cancel_on_conn_lost() -> std::size_t
+   {
+      auto cond = [](auto const& ptr)
+      {
+         BOOST_ASSERT(ptr != nullptr);
+
+         if (ptr->get_request().get_config().cancel_on_connection_lost)
+            return false;
+
+         return !(!ptr->get_request().get_config().retry && ptr->is_written());
+      };
+
+      auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), cond);
+
+      auto const ret = std::distance(point, std::end(reqs_));
+
+      std::for_each(point, std::end(reqs_), [](auto const& ptr) {
+         ptr->stop();
+      });
+
+      reqs_.erase(point, std::end(reqs_));
+      std::for_each(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
+         return ptr->reset_status();
+      });
+      return ret;
+   }
+
    template <
       class Adapter = detail::response_traits<void>::adapter_type,
       class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
@@ -118,13 +143,13 @@ public:
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code, std::size_t)
-         >(detail::exec_op<Derived, Adapter>{&derived(), &req, adapter}, token, resv_);
+         >(detail::exec_op<Derived, Adapter>{&derived(), &req, adapter}, token, writer_timer_);
    }
 
    template <
       class Adapter = detail::response_traits<void>::adapter_type,
       class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto async_receive_push(
+   auto async_receive(
       Adapter adapter = adapt(),
       CompletionToken token = CompletionToken{})
    {
@@ -132,33 +157,16 @@ public:
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code, std::size_t)
-         >(detail::receive_push_op<Derived, decltype(f)>{&derived(), f}, token, resv_);
+         >(detail::receive_op<Derived, decltype(f)>{&derived(), f}, token, writer_timer_);
    }
 
-   template <class Timeouts, class CompletionToken>
-   auto
-   async_run(endpoint ep, Timeouts ts, CompletionToken token)
+   template <class CompletionToken>
+   auto async_run(CompletionToken token)
    {
-      ep_ = std::move(ep);
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code)
-         >(detail::run_op<Derived, Timeouts>{&derived(), ts}, token, resv_);
-   }
-
-   template <class Adapter, class Timeouts, class CompletionToken>
-   auto async_run(
-      endpoint ep,
-      resp3::request const& req,
-      Adapter adapter,
-      Timeouts ts,
-      CompletionToken token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code, std::size_t)
-         >(detail::runexec_op<Derived, Adapter, Timeouts>
-            {&derived(), ep, &req, adapter, ts}, token, resv_);
+         >(detail::run_op<Derived>{&derived()}, token, writer_timer_);
    }
 
 private:
@@ -171,38 +179,119 @@ private:
 
    auto derived() -> Derived& { return static_cast<Derived&>(*this); }
 
+   void on_write()
+   {
+      // We have to clear the payload right after writing it to use it
+      // as a flag that informs there is no ongoing write.
+      write_buffer_.clear();
+
+      // Notice this must come before the for-each below.
+      cancel_push_requests();
+
+      std::for_each(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
+         if (ptr->is_staged())
+            ptr->mark_written();
+      });
+   }
+
    struct req_info {
-      explicit req_info(executor_type ex) : timer{ex} {}
-      timer_type timer;
-      resp3::request const* req = nullptr;
-      std::size_t cmds = 0;
-      bool stop = false;
-      bool written = false;
+   public:
+      enum class action
+      {
+         stop,
+         proceed,
+         none,
+      };
+
+      explicit req_info(resp3::request const& req, executor_type ex)
+      : timer_{ex}
+      , action_{action::none}
+      , req_{&req}
+      , cmds_{std::size(req)}
+      , status_{status::none}
+      {
+         timer_.expires_at(std::chrono::steady_clock::time_point::max());
+      }
+
+      auto proceed()
+      {
+         timer_.cancel();
+         action_ = action::proceed;
+      }
+
+      void stop()
+      {
+         timer_.cancel();
+         action_ = action::stop;
+      }
+
+      [[nodiscard]] auto is_written() const noexcept
+         { return status_ == status::written; }
+
+      [[nodiscard]] auto is_staged() const noexcept
+         { return status_ == status::staged; }
+
+      void mark_written() noexcept
+         { status_ = status::written; }
+
+      void mark_staged() noexcept
+         { status_ = status::staged; }
+
+      void reset_status() noexcept
+         { status_ = status::none; }
+
+      [[nodiscard]] auto get_number_of_commands() const noexcept
+         { return cmds_; }
+
+      [[nodiscard]] auto get_request() const noexcept -> auto const&
+         { return *req_; }
+
+      [[nodiscard]] auto get_action() const noexcept
+         { return action_;}
+
+      template <class CompletionToken>
+      auto async_wait(CompletionToken token)
+      {
+         return timer_.async_wait(std::move(token));
+      }
+
+   private:
+      enum class status
+      { none
+      , staged
+      , written
+      };
+
+      timer_type timer_;
+      action action_;
+      resp3::request const* req_;
+      std::size_t cmds_;
+      status status_;
    };
 
-   using reqs_type = std::deque<std::shared_ptr<req_info>>;
+   void remove_request(std::shared_ptr<req_info> const& info)
+   {
+      reqs_.erase(std::remove(std::begin(reqs_), std::end(reqs_), info));
+   }
 
-   template <class, class> friend struct detail::receive_push_op;
+   using reqs_type = std::pmr::deque<std::shared_ptr<req_info>>;
+
+   template <class, class> friend struct detail::receive_op;
    template <class> friend struct detail::reader_op;
    template <class> friend struct detail::writer_op;
-   template <class> friend struct detail::ping_op;
-   template <class, class> friend struct detail::run_op;
+   template <class> friend struct detail::run_op;
    template <class, class> friend struct detail::exec_op;
    template <class, class> friend struct detail::exec_read_op;
-   template <class, class, class> friend struct detail::runexec_op;
-   template <class> friend struct detail::resolve_with_timeout_op;
-   template <class> friend struct detail::check_idle_op;
-   template <class, class> friend struct detail::start_op;
    template <class> friend struct detail::send_receive_op;
 
    void cancel_push_requests()
    {
       auto point = std::stable_partition(std::begin(reqs_), std::end(reqs_), [](auto const& ptr) {
-         return !(ptr->written && ptr->req->size() == 0);
+         return !(ptr->is_staged() && ptr->get_request().size() == 0);
       });
 
       std::for_each(point, std::end(reqs_), [](auto const& ptr) {
-         ptr->timer.cancel();
+         ptr->proceed();
       });
 
       reqs_.erase(point, std::end(reqs_));
@@ -211,6 +300,15 @@ private:
    void add_request_info(std::shared_ptr<req_info> const& info)
    {
       reqs_.push_back(info);
+
+      if (info->get_request().has_hello_priority()) {
+         auto rend = std::partition_point(std::rbegin(reqs_), std::rend(reqs_), [](auto const& e) {
+               return !e->is_written() && !e->is_staged();
+         });
+
+         std::rotate(std::rbegin(reqs_), std::rbegin(reqs_) + 1, rend);
+      }
+
       if (derived().is_open() && cmds_ == 0 && write_buffer_.empty())
          writer_timer_.cancel();
    }
@@ -218,26 +316,13 @@ private:
    auto make_dynamic_buffer(std::size_t max_read_size = 512)
       { return boost::asio::dynamic_buffer(read_buffer_, max_read_size); }
 
-   template <class CompletionToken>
-   auto
-   async_resolve_with_timeout(
-      std::chrono::steady_clock::duration d,
-      CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::resolve_with_timeout_op<this_type>{this, d},
-            token, resv_);
-   }
-
    template <class CompletionToken>
    auto reader(CompletionToken&& token)
    {
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code)
-         >(detail::reader_op<Derived>{&derived()}, token, resv_.get_executor());
+         >(detail::reader_op<Derived>{&derived()}, token, writer_timer_);
    }
 
    template <class CompletionToken>
@@ -246,42 +331,7 @@ private:
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code)
-         >(detail::writer_op<Derived>{&derived()}, token, resv_.get_executor());
-   }
-
-   template <
-      class Timeouts,
-      class CompletionToken>
-   auto async_start(Timeouts ts, CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::start_op<this_type, Timeouts>{this, ts}, token, resv_);
-   }
-
-   template <class CompletionToken>
-   auto
-   async_ping(
-      std::chrono::steady_clock::duration d,
-      CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::ping_op<Derived>{&derived(), d}, token, resv_);
-   }
-
-   template <class CompletionToken>
-   auto
-   async_check_idle(
-      std::chrono::steady_clock::duration d,
-      CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::check_idle_op<Derived>{&derived(), d}, token, check_idle_timer_);
+         >(detail::writer_op<Derived>{&derived()}, token, writer_timer_);
    }
 
    template <class Adapter, class CompletionToken>
@@ -290,83 +340,43 @@ private:
       return boost::asio::async_compose
          < CompletionToken
          , void(boost::system::error_code, std::size_t)
-         >(detail::exec_read_op<Derived, Adapter>{&derived(), adapter, cmds}, token, resv_);
+         >(detail::exec_read_op<Derived, Adapter>{&derived(), adapter, cmds}, token, writer_timer_);
    }
 
    void stage_request(req_info& ri)
    {
-      write_buffer_ += ri.req->payload();
-      cmds_ += ri.req->size();
-      ri.written = true;
+      write_buffer_ += ri.get_request().payload();
+      cmds_ += ri.get_request().size();
+      ri.mark_staged();
    }
 
    void coalesce_requests()
    {
+      // Coalesce the requests and marks them staged. After a
+      // successful write staged requests will be marked as written.
       BOOST_ASSERT(write_buffer_.empty());
       BOOST_ASSERT(!reqs_.empty());
 
       stage_request(*reqs_.at(0));
 
       for (std::size_t i = 1; i < std::size(reqs_); ++i) {
-         if (!reqs_.at(i - 1)->req->get_config().coalesce ||
-             !reqs_.at(i - 0)->req->get_config().coalesce) {
+         if (!reqs_.at(i - 1)->get_request().get_config().coalesce ||
+             !reqs_.at(i - 0)->get_request().get_config().coalesce) {
             break;
          }
          stage_request(*reqs_.at(i));
       }
    }
 
-   void prepare_hello(endpoint const& ep)
-   {
-      req_.clear();
-      if (requires_auth(ep)) {
-         req_.push("HELLO", "3", "AUTH", ep.username, ep.password);
-      } else {
-         req_.push("HELLO", "3");
-      }
-   }
-
-   auto expect_role(std::string const& expected) -> bool
-   {
-      if (std::empty(expected))
-         return true;
-
-      resp3::node<std::string> role_node;
-      role_node.data_type = resp3::type::blob_string;
-      role_node.aggregate_size = 1;
-      role_node.depth = 1;
-      role_node.value = "role";
-
-      auto iter = std::find(std::cbegin(response_), std::cend(response_), role_node);
-      if (iter == std::end(response_))
-         return false;
-
-      ++iter;
-      BOOST_ASSERT(iter != std::cend(response_));
-      return iter->value == expected;
-   }
-
    // IO objects
-   resolver_type resv_;
-   timer_type ping_timer_;
-   timer_type check_idle_timer_;
    timer_type writer_timer_;
    timer_type read_timer_;
    push_channel_type push_channel_;
 
-   std::string read_buffer_;
-   std::string write_buffer_;
+   std::pmr::string read_buffer_;
+   std::pmr::string write_buffer_;
    std::size_t cmds_ = 0;
    reqs_type reqs_;
-
-   // Last time we received data.
-   time_point_type last_data_;
-
-   resp3::request req_;
-   std::vector<resp3::node<std::string>> response_;
-   endpoint ep_;
-   // The result of async_resolve.
-   boost::asio::ip::tcp::resolver::results_type endpoints_;
 };
 
 } // aedis

include/aedis/detail/connection_ops.hpp

@@ -20,7 +20,6 @@
 #include <aedis/error.hpp>
 #include <aedis/detail/net.hpp>
 #include <aedis/resp3/type.hpp>
-#include <aedis/resp3/detail/exec.hpp>
 #include <aedis/resp3/detail/parser.hpp>
 #include <aedis/resp3/read.hpp>
 #include <aedis/resp3/write.hpp>
@@ -30,56 +29,8 @@
 
 namespace aedis::detail {
 
-template <class Conn, class Timer>
-struct connect_with_timeout_op {
-   Conn* conn = nullptr;
-   boost::asio::ip::tcp::resolver::results_type const* endpoints = nullptr;
-   typename Conn::timeouts ts;
-   Timer* timer = nullptr;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , boost::system::error_code ec = {}
-                  , boost::asio::ip::tcp::endpoint const& = {})
-   {
-      reenter (coro)
-      {
-         timer->expires_after(ts.connect_timeout);
-         yield
-         detail::async_connect(
-            conn->next_layer(), *timer, *endpoints, std::move(self));
-         self.complete(ec);
-      }
-   }
-};
-
-template <class Conn>
-struct resolve_with_timeout_op {
-   Conn* conn = nullptr;
-   std::chrono::steady_clock::duration resolve_timeout;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , boost::system::error_code ec = {}
-                  , boost::asio::ip::tcp::resolver::results_type const& res = {})
-   {
-      reenter (coro)
-      {
-         conn->ping_timer_.expires_after(resolve_timeout);
-         yield
-         aedis::detail::async_resolve(
-            conn->resv_, conn->ping_timer_,
-            conn->ep_.host, conn->ep_.port, std::move(self));
-         conn->endpoints_ = res;
-         self.complete(ec);
-      }
-   }
-};
-
 template <class Conn, class Adapter>
-struct receive_push_op {
+struct receive_op {
    Conn* conn = nullptr;
    Adapter adapter;
    std::size_t read_size = 0;
@@ -93,34 +44,26 @@ struct receive_push_op {
    {
       reenter (coro)
       {
-         yield
-         conn->push_channel_.async_receive(std::move(self));
-         if (ec) {
-            self.complete(ec, 0);
-            return;
-         }
+         yield conn->push_channel_.async_receive(std::move(self));
+         AEDIS_CHECK_OP1();
 
          yield
          resp3::async_read(
             conn->next_layer(),
             conn->make_dynamic_buffer(adapter.get_max_read_size(0)),
             adapter, std::move(self));
-         if (ec) {
-            conn->cancel(operation::run);
 
-            // Needed to cancel the channel, otherwise the read
-            // operation will be blocked forever see
-            // test_push_adapter.
-            conn->cancel(operation::receive_push);
-            self.complete(ec, 0);
-            return;
-         }
+         // cancel(receive) is needed to cancel the channel, otherwise
+         // the read operation will be blocked forever see
+         // test_push_adapter.
+         AEDIS_CHECK_OP1(conn->cancel(operation::run); conn->cancel(operation::receive));
 
          read_size = n;
 
-         yield
-         conn->push_channel_.async_send({}, 0, std::move(self));
-         self.complete(ec, read_size);
+         yield conn->push_channel_.async_send({}, 0, std::move(self));
+         AEDIS_CHECK_OP1();
+
+         self.complete({}, read_size);
          return;
       }
    }
@@ -158,25 +101,15 @@ struct exec_read_op {
                   conn->next_layer(),
                   conn->make_dynamic_buffer(),
                   "\r\n", std::move(self));
-               if (ec) {
-                  conn->cancel(operation::run);
-                  self.complete(ec, 0);
-                  return;
-               }
+               AEDIS_CHECK_OP1(conn->cancel(operation::run));
             }
 
             // If the next request is a push we have to handle it to
-            // the receive_push_op wait for it to be done and continue.
+            // the receive_op wait for it to be done and continue.
             if (resp3::to_type(conn->read_buffer_.front()) == resp3::type::push) {
                yield
                async_send_receive(conn->push_channel_, std::move(self));
-               if (ec) {
-                  // Notice we don't call cancel_run() as that is the
-                  // responsability of the receive_push_op.
-                  self.complete(ec, 0);
-                  return;
-               }
-
+               AEDIS_CHECK_OP1(conn->cancel(operation::run));
                continue;
             }
             //-----------------------------------
@@ -190,11 +123,7 @@ struct exec_read_op {
 
             ++index;
 
-            if (ec) {
-               conn->cancel(operation::run);
-               self.complete(ec, 0);
-               return;
-            }
+            AEDIS_CHECK_OP1(conn->cancel(operation::run));
 
             read_size += n;
 
@@ -229,49 +158,56 @@ struct exec_op {
    {
       reenter (coro)
       {
-         if (req->get_config().close_on_connection_lost && !conn->is_open()) {
-            // The user doesn't want to wait for the connection to be
-            // stablished.
-            self.complete(error::not_connected, 0);
-            return;
+         // Check whether the user wants to wait for the connection to
+         // be stablished.
+         if (req->get_config().cancel_if_not_connected && !conn->is_open()) {
+            return self.complete(error::not_connected, 0);
          }
 
-         info = std::allocate_shared<req_info_type>(boost::asio::get_associated_allocator(self), conn->resv_.get_executor());
-         info->timer.expires_at(std::chrono::steady_clock::time_point::max());
-         info->req = req;
-         info->cmds = req->size();
-         info->stop = false;
+         info = std::allocate_shared<req_info_type>(boost::asio::get_associated_allocator(self), *req, conn->get_executor());
 
          conn->add_request_info(info);
-         yield
-         info->timer.async_wait(std::move(self));
-         BOOST_ASSERT(!!ec);
-         if (ec != boost::asio::error::operation_aborted) {
-            self.complete(ec, 0);
-            return;
+EXEC_OP_WAIT:
+         yield info->async_wait(std::move(self));
+         BOOST_ASSERT(ec == boost::asio::error::operation_aborted);
+
+         if (info->get_action() == Conn::req_info::action::stop) {
+            // Don't have to call remove_request as it has already
+            // been by cancel(exec).
+            return self.complete(ec, 0);
          }
 
-         // null can happen for example when resolve fails.
-         if (!conn->is_open() || info->stop) {
-            self.complete(ec, 0);
-            return;
+         if (is_cancelled(self)) {
+            if (info->is_written()) {
+               self.get_cancellation_state().clear();
+               goto EXEC_OP_WAIT; // Too late, can't cancel.
+            } else {
+               conn->remove_request(info);
+               self.complete(ec, 0);
+               return;
+            }
          }
 
          BOOST_ASSERT(conn->is_open());
           
          if (req->size() == 0) {
-            self.complete({}, 0);
-            return;
+            // Don't have to call remove_request as it has already
+            // been removed.
+            return self.complete({}, 0);
          }
 
          BOOST_ASSERT(!conn->reqs_.empty());
          BOOST_ASSERT(conn->reqs_.front() != nullptr);
          BOOST_ASSERT(conn->cmds_ != 0);
          yield
-         conn->async_exec_read(adapter, conn->reqs_.front()->cmds, std::move(self));
+         conn->async_exec_read(adapter, conn->reqs_.front()->get_number_of_commands(), std::move(self));
+         if (is_cancelled(self)) {
+            conn->remove_request(info);
+            return self.complete(boost::asio::error::operation_aborted, {});
+         }
+
          if (ec) {
-            self.complete(ec, 0);
-            return;
+            return self.complete(ec, {});
          }
 
          read_size = n;
@@ -285,7 +221,7 @@ struct exec_op {
                conn->writer_timer_.cancel_one();
          } else {
             BOOST_ASSERT(!conn->reqs_.empty());
-            conn->reqs_.front()->timer.cancel_one();
+            conn->reqs_.front()->proceed();
          }
 
          self.complete({}, read_size);
@@ -294,185 +230,43 @@ struct exec_op {
 };
 
 template <class Conn>
-struct ping_op {
-   Conn* conn;
-   std::chrono::steady_clock::duration ping_interval;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void
-   operator()( Self& self
-             , boost::system::error_code ec = {}
-             , std::size_t = 0)
-   {
-      reenter (coro) for (;;)
-      {
-         conn->ping_timer_.expires_after(ping_interval);
-         yield
-         conn->ping_timer_.async_wait(std::move(self));
-         if (ec || !conn->is_open()) {
-            conn->cancel(operation::run);
-            self.complete(ec);
-            return;
-         }
-
-         conn->req_.clear();
-         conn->req_.push("PING");
-         yield
-         conn->async_exec(conn->req_, adapt(), std::move(self));
-         if (ec) {
-            conn->cancel(operation::run);
-            self.complete({});
-            return;
-         }
-      }
-   }
-};
-
-template <class Conn>
-struct check_idle_op {
-   Conn* conn;
-   std::chrono::steady_clock::duration ping_interval;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()(Self& self, boost::system::error_code ec = {})
-   {
-      reenter (coro) for (;;)
-      {
-         conn->check_idle_timer_.expires_after(2 * ping_interval);
-         yield
-         conn->check_idle_timer_.async_wait(std::move(self));
-         if (ec) {
-            conn->cancel(operation::run);
-            self.complete({});
-            return;
-         }
-         if (!conn->is_open()) {
-            // Notice this is not an error, it was requested from an
-            // external op.
-            self.complete({});
-            return;
-         }
-
-         auto const now = std::chrono::steady_clock::now();
-         if (conn->last_data_ +  (2 * ping_interval) < now) {
-            conn->cancel(operation::run);
-            self.complete(error::idle_timeout);
-            return;
-         }
-
-         conn->last_data_ = now;
-      }
-   }
-};
-
-template <class Conn, class Timeouts>
-struct start_op {
-   Conn* conn;
-   Timeouts ts;
+struct run_op {
+   Conn* conn = nullptr;
    boost::asio::coroutine coro{};
 
    template <class Self>
    void operator()( Self& self
-                  , std::array<std::size_t, 4> order = {}
+                  , std::array<std::size_t, 2> order = {}
                   , boost::system::error_code ec0 = {}
-                  , boost::system::error_code ec1 = {}
-                  , boost::system::error_code ec2 = {}
-                  , boost::system::error_code ec3 = {})
+                  , boost::system::error_code ec1 = {})
    {
       reenter (coro)
       {
+         conn->write_buffer_.clear();
+         conn->cmds_ = 0;
+
          yield
          boost::asio::experimental::make_parallel_group(
             [this](auto token) { return conn->reader(token);},
-            [this](auto token) { return conn->writer(token);},
-            [this](auto token) { return conn->async_check_idle(ts.ping_interval, token);},
-            [this](auto token) { return conn->async_ping(ts.ping_interval, token);}
+            [this](auto token) { return conn->writer(token);}
          ).async_wait(
             boost::asio::experimental::wait_for_one(),
             std::move(self));
 
+         if (is_cancelled(self)) {
+            self.complete(boost::asio::error::operation_aborted);
+            return;
+         }
+
          switch (order[0]) {
            case 0: self.complete(ec0); break;
            case 1: self.complete(ec1); break;
-           case 2: self.complete(ec2); break;
-           case 3: self.complete(ec3); break;
            default: BOOST_ASSERT(false);
          }
       }
    }
 };
 
-template <class Conn, class Timeouts>
-struct run_op {
-   Conn* conn = nullptr;
-   Timeouts ts;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()(
-      Self& self,
-      boost::system::error_code ec = {},
-      std::size_t = 0)
-   {
-      reenter (coro)
-      {
-         yield
-         conn->async_resolve_with_timeout(ts.resolve_timeout, std::move(self));
-         if (ec) {
-            conn->cancel(operation::run);
-            self.complete(ec);
-            return;
-         }
-
-         yield
-         conn->derived().async_connect(conn->endpoints_, ts, conn->ping_timer_, std::move(self));
-         if (ec) {
-            conn->cancel(operation::run);
-            self.complete(ec);
-            return;
-         }
-
-         conn->prepare_hello(conn->ep_);
-         conn->ping_timer_.expires_after(ts.resp3_handshake_timeout);
-
-         yield
-         resp3::detail::async_exec(
-            conn->next_layer(),
-            conn->ping_timer_,
-            conn->req_,
-            adapter::adapt2(conn->response_),
-            conn->make_dynamic_buffer(),
-            std::move(self)
-         );
-
-         if (ec) {
-            conn->cancel(operation::run);
-            self.complete(ec);
-            return;
-         }
-
-         conn->ep_.password.clear();
-
-         if (!conn->expect_role(conn->ep_.role)) {
-            conn->cancel(operation::run);
-            self.complete(error::unexpected_server_role);
-            return;
-         }
-
-         conn->write_buffer_.clear();
-         conn->cmds_ = 0;
-         std::for_each(std::begin(conn->reqs_), std::end(conn->reqs_), [](auto const& ptr) {
-            return ptr->written = false;
-         });
-
-         yield conn->async_start(ts, std::move(self));
-         self.complete(ec);
-      }
-   }
-};
-
 template <class Conn>
 struct writer_op {
    Conn* conn;
@@ -491,33 +285,21 @@ struct writer_op {
             conn->coalesce_requests();
             yield
             boost::asio::async_write(conn->next_layer(), boost::asio::buffer(conn->write_buffer_), std::move(self));
-            if (ec) {
-               self.complete(ec);
+            AEDIS_CHECK_OP0(conn->cancel(operation::run));
+
+            conn->on_write();
+
+            // A socket.close() may have been called while a
+            // successful write might had already been queued, so we
+            // have to check here before proceeding.
+            if (!conn->is_open()) {
+               self.complete({});
                return;
             }
-
-            // We have to clear the payload right after the read op in
-            // order to to use it as a flag that informs there is no
-            // ongoing write.
-            conn->write_buffer_.clear();
-            conn->cancel_push_requests();
          }
 
-         if (conn->is_open()) {
-            yield
-            conn->writer_timer_.async_wait(std::move(self));
-            if (ec != boost::asio::error::operation_aborted) {
-               conn->cancel(operation::run);
-               self.complete(ec);
-               return;
-            }
-            // The timer may be canceled either to stop the write op
-            // or to proceed to the next write, the difference between
-            // the two is that for the former the socket will be
-            // closed first. We check for that below.
-         }
-
-         if (!conn->is_open()) {
+         yield conn->writer_timer_.async_wait(std::move(self));
+         if (!conn->is_open() || is_cancelled(self)) {
             // Notice this is not an error of the op, stoping was
             // requested from the outside, so we complete with
             // success.
@@ -547,13 +329,13 @@ struct reader_op {
             conn->next_layer(),
             conn->make_dynamic_buffer(),
             "\r\n", std::move(self));
-         if (ec) {
+
+         if (ec == boost::asio::error::eof) {
             conn->cancel(operation::run);
-            self.complete(ec);
-            return;
+            return self.complete({}); // EOFINAE: EOF is not an error.
          }
 
-         conn->last_data_ = std::chrono::steady_clock::now();
+         AEDIS_CHECK_OP0(conn->cancel(operation::run));
 
          // We handle unsolicited events in the following way
          //
@@ -575,25 +357,24 @@ struct reader_op {
          BOOST_ASSERT(!conn->read_buffer_.empty());
          if (resp3::to_type(conn->read_buffer_.front()) == resp3::type::push
              || conn->reqs_.empty()
-             || (!conn->reqs_.empty() && conn->reqs_.front()->cmds == 0)) {
-            yield
-            async_send_receive(conn->push_channel_, std::move(self));
-            if (ec) {
+             || (!conn->reqs_.empty() && conn->reqs_.front()->get_number_of_commands() == 0)) {
+            yield async_send_receive(conn->push_channel_, std::move(self));
+            if (!conn->is_open() || ec || is_cancelled(self)) {
                conn->cancel(operation::run);
-               self.complete(ec);
+               self.complete(boost::asio::error::basic_errors::operation_aborted);
                return;
             }
          } else {
             BOOST_ASSERT(conn->cmds_ != 0);
             BOOST_ASSERT(!conn->reqs_.empty());
-            BOOST_ASSERT(conn->reqs_.front()->cmds != 0);
-            conn->reqs_.front()->timer.cancel_one();
-            yield
-            conn->read_timer_.async_wait(std::move(self));
-            if (ec != boost::asio::error::operation_aborted ||
-                !conn->is_open()) {
+            BOOST_ASSERT(conn->reqs_.front()->get_number_of_commands() != 0);
+            conn->reqs_.front()->proceed();
+            yield conn->read_timer_.async_wait(std::move(self));
+            if (!conn->is_open() || is_cancelled(self)) {
+               // Added this cancel here to make sure any outstanding
+               // ping is cancelled.
                conn->cancel(operation::run);
-               self.complete(ec);
+               self.complete(boost::asio::error::basic_errors::operation_aborted);
                return;
             }
          }
@@ -601,48 +382,6 @@ struct reader_op {
    }
 };
 
-template <class Conn, class Adapter, class Timeouts>
-struct runexec_op {
-   Conn* conn = nullptr;
-   endpoint ep;
-   resp3::request const* req = nullptr;
-   Adapter adapter;
-   Timeouts ts;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , std::array<std::size_t, 2> order = {}
-                  , boost::system::error_code ec1 = {}
-                  , boost::system::error_code ec2 = {}
-                  , std::size_t n = 0)
-   {
-      reenter (coro)
-      {
-         yield
-         boost::asio::experimental::make_parallel_group(
-            [this, ep2 = ep](auto token) { return conn->async_run(ep2, ts, token);},
-            [this](auto token) { return conn->async_exec(*req, adapter, token);}
-         ).async_wait(
-            boost::asio::experimental::wait_for_one_error(),
-            std::move(self));
-
-         switch (order[0]) {
-           case 0: self.complete(ec1, n); return;
-           case 1: {
-              if (ec2)
-                 self.complete(ec2, n);
-              else
-                 self.complete(ec1, n);
-
-              return;
-           }
-           default: BOOST_ASSERT(false);
-         }
-      }
-   }
-};
-
 } // aedis::detail
 
 #include <boost/asio/unyield.hpp>

include/aedis/detail/net.hpp

@@ -19,102 +19,6 @@
 
 namespace aedis::detail {
 
-template <class Executor>
-using conn_timer_t = boost::asio::basic_waitable_timer<std::chrono::steady_clock, boost::asio::wait_traits<std::chrono::steady_clock>, Executor>;
-
-template <
-   class Stream,
-   class EndpointSequence
-   >
-struct connect_op {
-   Stream* socket;
-   conn_timer_t<typename Stream::executor_type>* timer;
-   EndpointSequence* endpoints;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , std::array<std::size_t, 2> order = {}
-                  , boost::system::error_code ec1 = {}
-                  , typename Stream::protocol_type::endpoint const& ep = {}
-                  , boost::system::error_code ec2 = {})
-   {
-      reenter (coro)
-      {
-         yield
-         boost::asio::experimental::make_parallel_group(
-            [this](auto token)
-            {
-               auto f = [](boost::system::error_code const&, auto const&) { return true; };
-               return boost::asio::async_connect(*socket, *endpoints, f, token);
-            },
-            [this](auto token) { return timer->async_wait(token);}
-         ).async_wait(
-            boost::asio::experimental::wait_for_one(),
-            std::move(self));
-
-         switch (order[0]) {
-            case 0: self.complete(ec1, ep); return;
-            case 1:
-            {
-               if (ec2) {
-                  self.complete(ec2, {});
-               } else {
-                  self.complete(error::connect_timeout, ep);
-               }
-               return;
-            }
-
-            default: BOOST_ASSERT(false);
-         }
-      }
-   }
-};
-
-template <class Resolver, class Timer>
-struct resolve_op {
-   Resolver* resv;
-   Timer* timer;
-   boost::string_view host;
-   boost::string_view port;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , std::array<std::size_t, 2> order = {}
-                  , boost::system::error_code ec1 = {}
-                  , boost::asio::ip::tcp::resolver::results_type res = {}
-                  , boost::system::error_code ec2 = {})
-   {
-      reenter (coro)
-      {
-         yield
-         boost::asio::experimental::make_parallel_group(
-            [this](auto token) { return resv->async_resolve(host.data(), port.data(), token);},
-            [this](auto token) { return timer->async_wait(token);}
-         ).async_wait(
-            boost::asio::experimental::wait_for_one(),
-            std::move(self));
-
-         switch (order[0]) {
-            case 0: self.complete(ec1, res); return;
-
-            case 1:
-            {
-               if (ec2) {
-                  self.complete(ec2, {});
-               } else {
-                  self.complete(error::resolve_timeout, {});
-               }
-               return;
-            }
-
-            default: BOOST_ASSERT(false);
-         }
-      }
-   }
-};
-
 template <class Channel>
 struct send_receive_op {
    Channel* channel;
@@ -129,55 +33,17 @@ struct send_receive_op {
       {
          yield
          channel->async_send(boost::system::error_code{}, 0, std::move(self));
-         if (ec) {
-            self.complete(ec, 0);
-            return;
-         }
+         AEDIS_CHECK_OP1();
 
          yield
          channel->async_receive(std::move(self));
-         self.complete(ec, 0);
+         AEDIS_CHECK_OP1();
+
+         self.complete({}, 0);
       }
    }
 };
 
-template <
-   class Stream,
-   class EndpointSequence,
-   class CompletionToken
-   >
-auto async_connect(
-      Stream& socket,
-      conn_timer_t<typename Stream::executor_type>& timer,
-      EndpointSequence ep,
-      CompletionToken&& token)
-{
-   return boost::asio::async_compose
-      < CompletionToken
-      , void(boost::system::error_code, typename Stream::protocol_type::endpoint const&)
-      >(connect_op<Stream, EndpointSequence>
-            {&socket, &timer, &ep}, token, socket, timer);
-}
-
-template <
-   class Resolver,
-   class Timer,
-   class CompletionToken =
-      boost::asio::default_completion_token_t<typename Resolver::executor_type>
-   >
-auto async_resolve(
-      Resolver& resv,
-      Timer& timer,
-      boost::string_view host,
-      boost::string_view port,
-      CompletionToken&& token = CompletionToken{})
-{
-   return boost::asio::async_compose
-      < CompletionToken
-      , void(boost::system::error_code, boost::asio::ip::tcp::resolver::results_type)
-      >(resolve_op<Resolver, Timer>{&resv, &timer, host, port}, token, resv, timer);
-}
-
 template <
    class Channel,
    class CompletionToken =

include/aedis/endpoint.hpp

@@ -1,40 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#ifndef AEDIS_ENDPOINT_HPP
-#define AEDIS_ENDPOINT_HPP
-
-#include <string>
-
-namespace aedis {
-
-/** \brief A Redis endpoint.
- *  \ingroup high-level-api
- */
-struct endpoint {
-   /// Redis server address.
-   std::string host;
-
-   /// Redis server port.
-   std::string port;
-
-   /// Expected role if any.
-   std::string role{};
-
-   /// Username if authentication is required.
-   std::string username{};
-
-   /// Password if authentication is required.
-   std::string password{};
-};
-
-auto is_valid(endpoint const& ep) noexcept -> bool;
-auto requires_auth(endpoint const& ep) noexcept -> bool;
-auto operator<<(std::ostream& os, endpoint const& ep) -> std::ostream&;
-
-} // aedis
-
-#endif // AEDIS_ENDPOINT_HPP

include/aedis/error.hpp

@@ -16,20 +16,8 @@ namespace aedis {
  */
 enum class error
 {
-   /// Resolve timeout.
-   resolve_timeout = 1,
-
-   /// Connect timeout.
-   connect_timeout,
-
-   /// Idle timeout.
-   idle_timeout,
-
-   /// Exec timeout.
-   exec_timeout,
-
    /// Invalid RESP3 type.
-   invalid_data_type,
+   invalid_data_type = 1,
 
    /// Can't parse the string as a number.
    not_a_number,
@@ -73,12 +61,6 @@ enum class error
    /// Got RESP3 null.
    resp3_null,
 
-   /// Unexpected server role.
-   unexpected_server_role,
-
-   /// SSL handshake timeout.
-   ssl_handshake_timeout,
-
    /// There is no stablished connection.
    not_connected,
 };

include/aedis/impl/endpoint.ipp

@@ -1,29 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <aedis/endpoint.hpp>
-
-#include <string>
-
-namespace aedis {
-
-auto is_valid(endpoint const& ep) noexcept -> bool
-{
-   return !std::empty(ep.host) && !std::empty(ep.port);
-}
-
-auto requires_auth(endpoint const& ep) noexcept -> bool
-{
-   return !std::empty(ep.username) && !std::empty(ep.password);
-}
-
-auto operator<<(std::ostream& os, endpoint const& ep) -> std::ostream&
-{
-   os << ep.host << ":" << ep.port << " (" << ep.username << "," << ep.password << ")";
-   return os;
-}
-
-} // aedis

include/aedis/impl/error.ipp

@@ -21,10 +21,6 @@ struct error_category_impl : boost::system::error_category {
    auto message(int ev) const -> std::string override
    {
       switch(static_cast<error>(ev)) {
-	 case error::resolve_timeout: return "Resolve operation timeout.";
-	 case error::connect_timeout: return "Connect operation timeout.";
-	 case error::idle_timeout: return "Idle timeout.";
-	 case error::exec_timeout: return "Exec timeout.";
 	 case error::invalid_data_type: return "Invalid resp3 type.";
 	 case error::not_a_number: return "Can't convert string to number.";
 	 case error::exceeeds_max_nested_depth: return "Exceeds the maximum number of nested responses.";
@@ -40,8 +36,6 @@ struct error_category_impl : boost::system::error_category {
 	 case error::incompatible_size: return "Aggregate container has incompatible size.";
 	 case error::not_a_double: return "Not a double.";
 	 case error::resp3_null: return "Got RESP3 null.";
-	 case error::unexpected_server_role: return "Unexpected server role.";
-	 case error::ssl_handshake_timeout: return "SSL handshake timeout.";
 	 case error::not_connected: return "Not connected.";
 	 default: BOOST_ASSERT(false); return "Aedis error.";
       }

include/aedis/operation.hpp

@@ -20,8 +20,8 @@ enum class operation {
    exec,
    /// Refers to `connection::async_run` operations.
    run,
-   /// Refers to `connection::async_receive_push` operations.
-   receive_push,
+   /// Refers to `connection::async_receive` operations.
+   receive,
 };
 
 } // aedis

include/aedis/resp3/detail/exec.hpp

@@ -1,172 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#ifndef AEDIS_RESP3_EXEC_HPP
-#define AEDIS_RESP3_EXEC_HPP
-
-#include <boost/assert.hpp>
-#include <boost/asio/ip/tcp.hpp>
-#include <boost/asio/read.hpp>
-#include <boost/asio/write.hpp>
-#include <boost/asio/coroutine.hpp>
-#include <boost/asio/compose.hpp>
-#include <boost/asio/steady_timer.hpp>
-#include <boost/asio/experimental/parallel_group.hpp>
-
-#include <aedis/error.hpp>
-#include <aedis/resp3/read.hpp>
-#include <aedis/resp3/request.hpp>
-
-#include <boost/asio/yield.hpp>
-
-namespace aedis::resp3::detail {
-
-template <
-   class AsyncStream,
-   class Adapter,
-   class DynamicBuffer
-   >
-struct exec_op {
-   AsyncStream* socket = nullptr;
-   request const* req = nullptr;
-   Adapter adapter;
-   DynamicBuffer dbuf{};
-   std::size_t n_cmds = 0;
-   std::size_t size = 0;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , boost::system::error_code ec = {}
-                  , std::size_t n = 0)
-   {
-      reenter (coro) for (;;)
-      {
-         if (req) {
-            yield
-            boost::asio::async_write(
-               *socket,
-               boost::asio::buffer(req->payload()),
-               std::move(self));
-
-            if (ec || n_cmds == 0) {
-               self.complete(ec, n);
-               return;
-            }
-
-            req = nullptr;
-         }
-
-         yield resp3::async_read(*socket, dbuf, adapter, std::move(self));
-         if (ec) {
-            self.complete(ec, 0);
-            return;
-         }
-
-         size += n;
-         if (--n_cmds == 0) {
-            self.complete(ec, size);
-            return;
-         }
-      }
-   }
-};
-
-template <
-   class AsyncStream,
-   class Adapter,
-   class DynamicBuffer,
-   class CompletionToken = boost::asio::default_completion_token_t<typename AsyncStream::executor_type>
-   >
-auto async_exec(
-   AsyncStream& socket,
-   request const& req,
-   Adapter adapter,
-   DynamicBuffer dbuf,
-   CompletionToken token = CompletionToken{})
-{
-   return boost::asio::async_compose
-      < CompletionToken
-      , void(boost::system::error_code, std::size_t)
-      >(detail::exec_op<AsyncStream, Adapter, DynamicBuffer>
-         {&socket, &req, adapter, dbuf, req.size()}, token, socket);
-}
-
-template <
-   class AsyncStream,
-   class Timer,
-   class Adapter,
-   class DynamicBuffer
-   >
-struct exec_with_timeout_op {
-   AsyncStream* socket = nullptr;
-   Timer* timer = nullptr;
-   request const* req = nullptr;
-   Adapter adapter;
-   DynamicBuffer dbuf{};
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , std::array<std::size_t, 2> order = {}
-                  , boost::system::error_code ec1 = {}
-                  , std::size_t n = 0
-                  , boost::system::error_code ec2 = {})
-   {
-      reenter (coro)
-      {
-         yield
-         boost::asio::experimental::make_parallel_group(
-            [this](auto token) { return detail::async_exec(*socket, *req, adapter, dbuf, token);},
-            [this](auto token) { return timer->async_wait(token);}
-         ).async_wait(
-            boost::asio::experimental::wait_for_one(),
-            std::move(self));
-
-         switch (order[0]) {
-            case 0: self.complete(ec1, n); break;
-            case 1:
-            {
-               if (ec2) {
-                  self.complete(ec2, 0);
-               } else {
-                  self.complete(aedis::error::exec_timeout, 0);
-               }
-
-            } break;
-
-            default: BOOST_ASSERT(false);
-         }
-      }
-   }
-};
-
-template <
-   class AsyncStream,
-   class Timer,
-   class Adapter,
-   class DynamicBuffer,
-   class CompletionToken = boost::asio::default_completion_token_t<typename AsyncStream::executor_type>
-   >
-auto async_exec(
-   AsyncStream& socket,
-   Timer& timer,
-   request const& req,
-   Adapter adapter,
-   DynamicBuffer dbuf,
-   CompletionToken token = CompletionToken{})
-{
-   return boost::asio::async_compose
-      < CompletionToken
-      , void(boost::system::error_code, std::size_t)
-      >(detail::exec_with_timeout_op<AsyncStream, Timer, Adapter, DynamicBuffer>
-         {&socket, &timer, &req, adapter, dbuf}, token, socket, timer);
-}
-
-} // aedis::resp3::detail
-
-#include <boost/asio/unyield.hpp>
-#endif // AEDIS_RESP3_EXEC_HPP

include/aedis/resp3/detail/parser.hpp

@@ -212,7 +212,7 @@ public:
 
    // The bulk type expected in the next read. If none is expected returns
    // type::invalid.
-   auto bulk() const noexcept { return bulk_; }
+   [[nodiscard]] auto bulk() const noexcept { return bulk_; }
 
    // The length expected in the the next bulk.
    [[nodiscard]] auto bulk_length() const noexcept { return bulk_length_; }

include/aedis/resp3/detail/read_ops.hpp

@@ -17,6 +17,29 @@
 
 #include <boost/asio/yield.hpp>
 
+namespace aedis::detail
+{
+template <class T>
+auto is_cancelled(T const& self)
+{
+   return self.get_cancellation_state().cancelled() != boost::asio::cancellation_type_t::none;
+}
+}
+
+#define AEDIS_CHECK_OP0(X)\
+   if (ec || aedis::detail::is_cancelled(self)) {\
+      X;\
+      self.complete(!!ec ? ec : boost::asio::error::operation_aborted);\
+      return;\
+   }
+
+#define AEDIS_CHECK_OP1(X)\
+   if (ec || aedis::detail::is_cancelled(self)) {\
+      X;\
+      self.complete(!!ec ? ec : boost::asio::error::operation_aborted, {});\
+      return;\
+   }
+
 namespace aedis::resp3::detail {
 
 struct ignore_response {
@@ -59,12 +82,7 @@ public:
          if (parser_.bulk() == type::invalid) {
             yield
             boost::asio::async_read_until(stream_, buf_, "\r\n", std::move(self));
-
-            if (ec) {
-               self.complete(ec, 0);
-               return;
-            }
-
+            AEDIS_CHECK_OP1();
          } else {
 	    // On a bulk read we can't read until delimiter since the
 	    // payload may contain the delimiter itself so we have to
@@ -83,11 +101,7 @@ public:
                   buf_.data(buffer_size_, parser_.bulk_length() + 2 - buffer_size_),
                   boost::asio::transfer_all(),
                   std::move(self));
-
-               if (ec) {
-                  self.complete(ec, 0);
-                  return;
-               }
+               AEDIS_CHECK_OP1();
             }
 
             n = parser_.bulk_length() + 2;

include/aedis/resp3/impl/request.ipp

@@ -16,4 +16,9 @@ auto has_push_response(boost::string_view cmd) -> bool
    return false;
 }
 
+auto is_hello(boost::string_view cmd) -> bool
+{
+   return cmd == "HELLO";
+}
+
 } // aedis::resp3::detail

include/aedis/resp3/node.hpp

@@ -26,16 +26,16 @@ namespace aedis::resp3 {
 template <class String>
 struct node {
    /// The RESP3 type of the data in this node.
-   resp3::type data_type;
+   type data_type = type::invalid;
 
    /// The number of elements of an aggregate.
-   std::size_t aggregate_size;
+   std::size_t aggregate_size{};
 
    /// The depth of this node in the response tree.
-   std::size_t depth;
+   std::size_t depth{};
 
    /// The actual data. For aggregate types this is usually empty.
-   String value;
+   String value{};
 };
 
 /** @brief Converts the node to a string.

include/aedis/resp3/request.hpp

@@ -9,6 +9,7 @@
 
 #include <string>
 #include <tuple>
+#include <memory_resource>
 
 #include <boost/hana.hpp>
 #include <boost/utility/string_view.hpp>
@@ -67,6 +68,8 @@ namespace detail {
 
 auto has_push_response(boost::string_view cmd) -> bool;
 
+auto is_hello(boost::string_view cmd) -> bool;
+
 template <class T>
 struct add_bulk_impl {
    template <class Request>
@@ -148,8 +151,8 @@ void add_separator(Request& to)
 }
 } // detail
 
-/** @brief Creates Redis requests.
- *  @ingroup high-level-api
+/** \brief Creates Redis requests.
+ *  \ingroup high-level-api
  *  
  *  A request is composed of one or more Redis commands and is
  *  referred to in the redis documentation as a pipeline, see
@@ -162,49 +165,72 @@ void add_separator(Request& to)
  *  r.push("PING");
  *  r.push("PING", "key");
  *  r.push("QUIT");
- *  co_await async_write(socket, buffer(r));
  *  @endcode
  *
- *  @remarks
+ *  \remarks
  *
- *  @li Non-string types will be converted to string by using \c
+ *  \li Non-string types will be converted to string by using \c
  *  to_bulk, which must be made available over ADL.
- *  @li Uses std::string as internal storage.
+ *  \li Uses std::string as internal storage.
  */
 class request {
 public:
    /// Request configuration options.
    struct config {
-      /** @brief If set to true, requests started with
-       * `connection::async_exe` will fail either if the connection is
-       * lost while the request is pending or if `async_exec` is
-       * called while there is no connection with Redis. The default
+      /** \brief If set to true, requests started with
+       * `aedis::connection::async_exec` will fail if the connection is
+       * lost while the request is pending. The default
        * behaviour is not to close requests.
        */
-      bool close_on_connection_lost = false;
+      bool cancel_on_connection_lost = false;
 
-      /** @brief Coalesce this with other requests.
-       *
-       *  If true this request will be coalesced with other requests,
+      /** \brief If true this request will be coalesced with other requests,
        *  see https://redis.io/topics/pipelining. If false, this
        *  request will be sent individually.
        */
       bool coalesce = true;
+
+      /** \brief If set to true, requests started with
+       * `aedis::connection::async_exec` will fail if the call happens
+       *  before the connection with Redis was stablished.
+       */
+      bool cancel_if_not_connected = false;
+
+      /** \brief If true, the implementation will resend this
+       * request if it remained unresponded when
+       * `aedis::connection::async_run` completed. Has effect only if
+       * cancel_on_connection_lost is true.
+       */
+      bool retry = true;
+
+      /** \brief If this request has a HELLO command and this flag is
+       * set to true, the `aedis::connection` will move it to the
+       * front of the queue of awaiting requests. This makes it
+       * possible to send HELLO and authenticate before other
+       * commands are sent.
+       */
+      bool hello_with_priority = true;
    };
 
-   /** @brief Constructor
+   /** \brief Constructor
     *  
-    *  @param cfg Configuration options.
+    *  \param cfg Configuration options.
+    *  \param resource Memory resource.
     */
-   explicit request(config cfg = config{false, true})
-   : cfg_{cfg}
-   {}
+    explicit
+    request(config cfg = config{false, true, false, true, true},
+            std::pmr::memory_resource* resource = std::pmr::get_default_resource())
+    : cfg_{cfg}, payload_(resource) {}
 
-   //// Returns the number of commands contained in this request.
-   auto size() const noexcept -> std::size_t { return commands_;};
+    //// Returns the number of commands contained in this request.
+   [[nodiscard]] auto size() const noexcept -> std::size_t
+      { return commands_;};
 
-   // Returns the request payload.
-   auto payload() const noexcept -> auto const& { return payload_;}
+   [[nodiscard]] auto payload() const noexcept -> auto const&
+      { return payload_;}
+
+   [[nodiscard]] auto has_hello_priority() const noexcept -> auto const&
+      { return has_hello_priority_;}
 
    /// Clears the request preserving allocated memory.
    void clear()
@@ -213,6 +239,16 @@ public:
       commands_ = 0;
    }
 
+   /// Calls std::string::reserve on the internal storage.
+   void reserve(std::size_t new_cap = 0)
+      { payload_.reserve(new_cap); }
+
+   /// Returns a const reference to the config object.
+   [[nodiscard]] auto get_config() const noexcept -> auto const& {return cfg_; }
+
+   /// Returns a reference to the config object.
+   [[nodiscard]] auto get_config() noexcept -> auto& {return cfg_; }
+
    /** @brief Appends a new command to the end of the request.
     *
     *  For example
@@ -240,8 +276,7 @@ public:
       detail::add_bulk(payload_, cmd);
       detail::add_bulk(payload_, make_tuple(args...));
 
-      if (!detail::has_push_response(cmd))
-         ++commands_;
+      check_cmd(cmd);
    }
 
    /** @brief Appends a new command to the end of the request.
@@ -257,7 +292,7 @@ public:
     *     };
     *
     *  request req;
-    *  req.push_range2("HSET", "key", std::cbegin(map), std::cend(map));
+    *  req.push_range("HSET", "key", std::cbegin(map), std::cend(map));
     *  @endcode
     *  
     *  \param cmd The command e.g. Redis or Sentinel command.
@@ -266,7 +301,8 @@ public:
     *  \param end Iterator to the end of the range.
     */
    template <class Key, class ForwardIterator>
-   void push_range2(boost::string_view cmd, Key const& key, ForwardIterator begin, ForwardIterator end)
+   void push_range(boost::string_view cmd, Key const& key, ForwardIterator begin, ForwardIterator end,
+                    typename std::iterator_traits<ForwardIterator>::value_type * = nullptr)
    {
       using value_type = typename std::iterator_traits<ForwardIterator>::value_type;
       using resp3::type;
@@ -283,8 +319,7 @@ public:
       for (; begin != end; ++begin)
 	 detail::add_bulk(payload_, *begin);
 
-      if (!detail::has_push_response(cmd))
-         ++commands_;
+      check_cmd(cmd);
    }
 
    /** @brief Appends a new command to the end of the request.
@@ -297,7 +332,7 @@ public:
     *     { "channel1" , "channel2" , "channel3" }
     *
     *  request req;
-    *  req.push("SUBSCRIBE", std::cbegin(channels), std::cedn(channels));
+    *  req.push("SUBSCRIBE", std::cbegin(channels), std::cend(channels));
     *  \endcode
     *
     *  \param cmd The Redis command
@@ -305,7 +340,8 @@ public:
     *  \param end Iterator to the end of the range.
     */
    template <class ForwardIterator>
-   void push_range2(boost::string_view cmd, ForwardIterator begin, ForwardIterator end)
+   void push_range(boost::string_view cmd, ForwardIterator begin, ForwardIterator end,
+                   typename std::iterator_traits<ForwardIterator>::value_type * = nullptr)
    {
       using value_type = typename std::iterator_traits<ForwardIterator>::value_type;
       using resp3::type;
@@ -321,8 +357,7 @@ public:
       for (; begin != end; ++begin)
 	 detail::add_bulk(payload_, *begin);
 
-      if (!detail::has_push_response(cmd))
-         ++commands_;
+      check_cmd(cmd);
    }
 
    /** @brief Appends a new command to the end of the request.
@@ -334,11 +369,12 @@ public:
     *  \param range Range to send e.g. and \c std::map.
     */
    template <class Key, class Range>
-   void push_range(boost::string_view cmd, Key const& key, Range const& range)
+   void push_range(boost::string_view cmd, Key const& key, Range const& range,
+                   decltype(std::begin(range)) * = nullptr)
    {
       using std::begin;
       using std::end;
-      push_range2(cmd, key, begin(range), end(range));
+      push_range(cmd, key, begin(range), end(range));
    }
 
    /** @brief Appends a new command to the end of the request.
@@ -349,23 +385,27 @@ public:
     *  \param range Range to send e.g. and \c std::map.
     */
    template <class Range>
-   void push_range(boost::string_view cmd, Range const& range)
+   void push_range(boost::string_view cmd, Range const& range,
+                   decltype(std::begin(range)) * = nullptr)
    {
       using std::begin;
       using std::end;
-      push_range2(cmd, begin(range), end(range));
+      push_range(cmd, begin(range), end(range));
    }
 
-   /// Calls std::string::reserve on the internal storage.
-   void reserve(std::size_t new_cap = 0)
-      { payload_.reserve(new_cap); }
-
-   auto get_config() const noexcept -> auto const& {return cfg_; }
-
 private:
-   std::string payload_;
-   std::size_t commands_ = 0;
+   void check_cmd(boost::string_view cmd)
+   {
+      if (!detail::has_push_response(cmd))
+         ++commands_;
+
+      has_hello_priority_ = detail::is_hello(cmd) && cfg_.hello_with_priority;
+   }
+
    config cfg_;
+   std::pmr::string payload_;
+   std::size_t commands_ = 0;
+   bool has_hello_priority_ = false;
 };
 
 } // aedis::resp3

include/aedis/resp3/write.hpp

@@ -13,6 +13,9 @@ namespace aedis::resp3 {
 
 /** \brief Writes a request synchronously.
  *  \ingroup low-level-api
+ *
+ *  \param stream Stream to write the request to.
+ *  \param req Request to write.
  */
 template<
    class SyncWriteStream,
@@ -37,6 +40,10 @@ auto write(
 
 /** \brief Writes a request asynchronously.
  *  \ingroup low-level-api
+ *
+ *  \param stream Stream to write the request to.
+ *  \param req Request to write.
+ *  \param token Asio completion token.
  */
 template<
    class AsyncWriteStream,

include/aedis/src.hpp

@@ -5,7 +5,6 @@
  */
 
 #include <aedis/impl/error.ipp>
-#include <aedis/impl/endpoint.ipp>
 #include <aedis/resp3/impl/request.ipp>
 #include <aedis/resp3/impl/type.ipp>
 #include <aedis/resp3/detail/impl/parser.ipp>

include/aedis/ssl/connection.hpp

@@ -12,12 +12,11 @@
 
 #include <boost/asio/io_context.hpp>
 #include <aedis/detail/connection_base.hpp>
-#include <aedis/ssl/detail/connection_ops.hpp>
 
 namespace aedis::ssl {
 
 template <class>
-class connection;
+class basic_connection;
 
 /** \brief A SSL connection to the Redis server.
  *  \ingroup high-level-api
@@ -26,55 +25,49 @@ class connection;
  *  commands can be sent at any time. For more details, please see the
  *  documentation of each individual function.
  *
- *  @remarks This class exposes only asynchronous member functions,
- *  synchronous communications with the Redis server is provided by
- *  the `aedis::sync` class.
- *
- *  @tparam Derived class.
+ *  @tparam AsyncReadWriteStream A stream that supports reading and
+ *  writing.
  *
  */
 template <class AsyncReadWriteStream>
-class connection<boost::asio::ssl::stream<AsyncReadWriteStream>> :
+class basic_connection<boost::asio::ssl::stream<AsyncReadWriteStream>> :
    private aedis::detail::connection_base<
       typename boost::asio::ssl::stream<AsyncReadWriteStream>::executor_type,
-      connection<boost::asio::ssl::stream<AsyncReadWriteStream>>> {
+      basic_connection<boost::asio::ssl::stream<AsyncReadWriteStream>>> {
 public:
    /// Type of the next layer
    using next_layer_type = boost::asio::ssl::stream<AsyncReadWriteStream>;
 
    /// Executor type.
    using executor_type = typename next_layer_type::executor_type;
-   using base_type = aedis::detail::connection_base<executor_type, connection<boost::asio::ssl::stream<AsyncReadWriteStream>>>;
 
-   /** \brief Connection configuration parameters.
-    */
-   struct timeouts {
-      /// Timeout of the resolve operation.
-      std::chrono::steady_clock::duration resolve_timeout = std::chrono::seconds{10};
-
-      /// Timeout of the connect operation.
-      std::chrono::steady_clock::duration connect_timeout = std::chrono::seconds{10};
-
-      /// Timeout of the ssl handshake operation.
-      std::chrono::steady_clock::duration handshake_timeout = std::chrono::seconds{10};
-
-      /// Timeout of the resp3 handshake operation.
-      std::chrono::steady_clock::duration resp3_handshake_timeout = std::chrono::seconds{2};
-
-      /// Time interval of ping operations.
-      std::chrono::steady_clock::duration ping_interval = std::chrono::seconds{1};
+   /// Rebinds the socket type to another executor.
+   template <class Executor1>
+   struct rebind_executor
+   {
+      /// The socket type when rebound to the specified executor.
+      using other = basic_connection<boost::asio::ssl::stream<typename AsyncReadWriteStream::template rebind_executor<Executor1>::other>>;
    };
 
-   /// Constructor
-   explicit connection(executor_type ex, boost::asio::ssl::context& ctx)
-   : base_type{ex}
-   , stream_{ex, ctx}
-   {
-   }
+   using base_type = aedis::detail::connection_base<executor_type, basic_connection<boost::asio::ssl::stream<AsyncReadWriteStream>>>;
 
    /// Constructor
-   explicit connection(boost::asio::io_context& ioc, boost::asio::ssl::context& ctx)
-   : connection(ioc.get_executor(), ctx)
+   explicit
+   basic_connection(
+      executor_type ex,
+      boost::asio::ssl::context& ctx,
+      std::pmr::memory_resource* resource = std::pmr::get_default_resource())
+   : base_type{ex, resource}
+   , stream_{ex, ctx}
+   { }
+
+   /// Constructor
+   explicit
+   basic_connection(
+      boost::asio::io_context& ioc,
+      boost::asio::ssl::context& ctx,
+      std::pmr::memory_resource* resource = std::pmr::get_default_resource())
+   : basic_connection(ioc.get_executor(), ctx, resource)
    { }
 
    /// Returns the associated executor.
@@ -92,40 +85,19 @@ public:
    /// Returns a const reference to the next layer.
    auto const& next_layer() const noexcept { return stream_; }
 
-   /** @brief Connects and executes a request asynchronously.
+   /** @brief Establishes a connection with the Redis server asynchronously.
     *
-    *  See aedis::connection::async_run for detailed information.
+    *  See aedis::connection::async_run for more information.
     */
    template <class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto
-   async_run(
-      endpoint ep,
-      timeouts ts = timeouts{},
-      CompletionToken token = CompletionToken{})
+   auto async_run(CompletionToken token = CompletionToken{})
    {
-      return base_type::async_run(ep, ts, std::move(token));
-   }
-
-   /** @brief Connects and executes a request asynchronously.
-    *
-    *  See aedis::connection::async_run for detailed information.
-    */
-   template <
-      class Adapter = aedis::detail::response_traits<void>::adapter_type,
-      class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto async_run(
-      endpoint ep,
-      resp3::request const& req,
-      Adapter adapter,
-      timeouts ts,
-      CompletionToken token = CompletionToken{})
-   {
-      return base_type::async_run(ep, req, adapter, ts, std::move(token));
+      return base_type::async_run(std::move(token));
    }
 
    /** @brief Executes a command on the Redis server asynchronously.
     *
-    *  See aedis::connection::async_exec for detailed information.
+    *  See aedis::connection::async_exec for more information.
     */
    template <
       class Adapter = aedis::detail::response_traits<void>::adapter_type,
@@ -140,59 +112,49 @@ public:
 
    /** @brief Receives server side pushes asynchronously.
     *
-    *  See aedis::connection::async_receive_push for detailed information.
+    *  See aedis::connection::async_receive for detailed information.
     */
    template <
       class Adapter = aedis::detail::response_traits<void>::adapter_type,
       class CompletionToken = boost::asio::default_completion_token_t<executor_type>>
-   auto async_receive_push(
+   auto async_receive(
       Adapter adapter = adapt(),
       CompletionToken token = CompletionToken{})
    {
-      return base_type::async_receive_push(adapter, std::move(token));
+      return base_type::async_receive(adapter, std::move(token));
    }
 
    /** @brief Cancel operations.
     *
-    *  See aedis::connection::cancel for detailed information.
+    *  See aedis::connection::cancel for more information.
     */
    auto cancel(operation op) -> std::size_t
       { return base_type::cancel(op); }
 
+   auto& lowest_layer() noexcept { return stream_.lowest_layer(); }
+
 private:
-   using this_type = connection<next_layer_type>;
+   using this_type = basic_connection<next_layer_type>;
 
    template <class, class> friend class aedis::detail::connection_base;
    template <class, class> friend struct aedis::detail::exec_op;
-   template <class, class> friend struct detail::ssl_connect_with_timeout_op;
-   template <class, class> friend struct aedis::detail::run_op;
-   template <class> friend struct aedis::detail::writer_op;
-   template <class> friend struct aedis::detail::check_idle_op;
-   template <class> friend struct aedis::detail::reader_op;
    template <class, class> friend struct aedis::detail::exec_read_op;
-   template <class> friend struct aedis::detail::ping_op;
+   template <class, class> friend struct detail::receive_op;
+   template <class> friend struct aedis::detail::run_op;
+   template <class> friend struct aedis::detail::writer_op;
+   template <class> friend struct aedis::detail::reader_op;
 
-   auto& lowest_layer() noexcept { return stream_.lowest_layer(); }
    auto is_open() const noexcept { return stream_.next_layer().is_open(); }
    void close() { stream_.next_layer().close(); }
 
-   template <class Timer, class CompletionToken>
-   auto
-   async_connect(
-      boost::asio::ip::tcp::resolver::results_type const& endpoints,
-      timeouts ts,
-      Timer& timer,
-      CompletionToken&& token)
-   {
-      return boost::asio::async_compose
-         < CompletionToken
-         , void(boost::system::error_code)
-         >(detail::ssl_connect_with_timeout_op<this_type, Timer>{this, &endpoints, ts, &timer}, token, stream_);
-   }
-
    next_layer_type stream_;
 };
 
+/** \brief A connection that uses a boost::asio::ssl::stream<boost::asio::ip::tcp::socket>.
+ *  \ingroup high-level-api
+ */
+using connection = basic_connection<boost::asio::ssl::stream<boost::asio::ip::tcp::socket>>;
+
 } // aedis::ssl
 
 #endif // AEDIS_SSL_CONNECTION_HPP

include/aedis/ssl/detail/connection_ops.hpp

@@ -1,113 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#ifndef AEDIS_SSL_CONNECTION_OPS_HPP
-#define AEDIS_SSL_CONNECTION_OPS_HPP
-
-#include <array>
-
-#include <boost/assert.hpp>
-#include <boost/system.hpp>
-#include <boost/asio/experimental/parallel_group.hpp>
-#include <boost/asio/yield.hpp>
-
-namespace aedis::ssl::detail
-{
-
-template <class Stream>
-struct handshake_op {
-   Stream* stream;
-   aedis::detail::conn_timer_t<typename Stream::executor_type>* timer;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , std::array<std::size_t, 2> order = {}
-                  , boost::system::error_code ec1 = {}
-                  , boost::system::error_code ec2 = {})
-   {
-      reenter (coro)
-      {
-         yield
-         boost::asio::experimental::make_parallel_group(
-            [this](auto token)
-            {
-               return stream->async_handshake(boost::asio::ssl::stream_base::client, token);
-            },
-            [this](auto token) { return timer->async_wait(token);}
-         ).async_wait(
-            boost::asio::experimental::wait_for_one(),
-            std::move(self));
-
-         switch (order[0]) {
-            case 0: self.complete(ec1); return;
-            case 1:
-            {
-               BOOST_ASSERT_MSG(!ec2, "handshake_op: Incompatible state.");
-               self.complete(error::ssl_handshake_timeout);
-               return;
-            }
-
-            default: BOOST_ASSERT(false);
-         }
-      }
-   }
-};
-
-template <
-   class Stream,
-   class CompletionToken
-   >
-auto async_handshake(
-      Stream& stream,
-      aedis::detail::conn_timer_t<typename Stream::executor_type>& timer,
-      CompletionToken&& token)
-{
-   return boost::asio::async_compose
-      < CompletionToken
-      , void(boost::system::error_code)
-      >(handshake_op<Stream>{&stream, &timer}, token, stream, timer);
-}
-
-template <class Conn, class Timer>
-struct ssl_connect_with_timeout_op {
-   Conn* conn = nullptr;
-   boost::asio::ip::tcp::resolver::results_type const* endpoints = nullptr;
-   typename Conn::timeouts ts;
-   Timer* timer = nullptr;
-   boost::asio::coroutine coro{};
-
-   template <class Self>
-   void operator()( Self& self
-                  , boost::system::error_code ec = {}
-                  , boost::asio::ip::tcp::endpoint const& = {})
-   {
-      reenter (coro)
-      {
-         timer->expires_after(ts.connect_timeout);
-
-         yield
-         aedis::detail::async_connect(
-            conn->lowest_layer(), *timer, *endpoints, std::move(self));
-
-         if (ec) {
-            self.complete(ec);
-            return;
-         }
-
-         timer->expires_after(ts.handshake_timeout);
-
-         yield
-         async_handshake(conn->next_layer(), *timer, std::move(self));
-         self.complete(ec);
-      }
-   }
-};
-
-} // aedis::ssl::detail
- 
-#include <boost/asio/unyield.hpp>
-#endif // AEDIS_SSL_CONNECTION_OPS_HPP

tests/common.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <boost/asio.hpp>
+#include <chrono>
+
+namespace net = boost::asio;
+using endpoints = net::ip::tcp::resolver::results_type;
+
+auto
+resolve(
+   std::string const& host = "127.0.0.1",
+   std::string const& port = "6379") -> endpoints
+{
+   net::io_context ioc;
+   net::ip::tcp::resolver resv{ioc};
+   return resv.resolve(host, port);
+}

tests/conn_echo_stress.cpp

@@ -0,0 +1,96 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/system/errc.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+
+#include "common.hpp"
+
+namespace net = boost::asio;
+using error_code = boost::system::error_code;
+
+using aedis::resp3::request;
+using aedis::operation;
+using aedis::adapt;
+using connection = net::use_awaitable_t<>::as_default_on_t<aedis::connection>;
+
+#include <boost/asio/experimental/awaitable_operators.hpp>
+using namespace net::experimental::awaitable_operators;
+
+net::awaitable<void> push_consumer(std::shared_ptr<connection> conn, int expected)
+{
+   int c = 0;
+   for (;;) {
+      co_await conn->async_receive(adapt(), net::use_awaitable);
+      if (++c == expected)
+         break;
+   }
+
+   request req;
+   req.push("HELLO", 3);
+   req.push("QUIT");
+   co_await conn->async_exec(req, adapt());
+}
+
+auto echo_session(std::shared_ptr<connection> conn, std::string id, int n) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+
+   request req;
+   std::tuple<aedis::ignore, std::string> resp;
+
+   for (auto i = 0; i < n; ++i) {
+      auto const msg = id + "/" + std::to_string(i);
+      //std::cout << msg << std::endl;
+      req.push("HELLO", 3);
+      req.push("PING", msg);
+      req.push("SUBSCRIBE", "channel");
+      boost::system::error_code ec;
+      co_await conn->async_exec(req, adapt(resp), net::redirect_error(net::use_awaitable, ec));
+      BOOST_TEST(!ec);
+      BOOST_CHECK_EQUAL(msg, std::get<1>(resp));
+      req.clear();
+      std::get<1>(resp).clear();
+   }
+}
+
+auto async_echo_stress() -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+   auto conn = std::make_shared<connection>(ex);
+
+   int const sessions = 1000;
+   int const msgs = 100;
+   int total = sessions * msgs;
+
+   net::co_spawn(ex, push_consumer(conn, total), net::detached);
+
+   for (int i = 0; i < sessions; ++i) 
+      net::co_spawn(ex, echo_session(conn, std::to_string(i), msgs), net::detached);
+
+   auto const addrs = resolve();
+   co_await net::async_connect(conn->next_layer(), addrs);
+   co_await conn->async_run();
+}
+
+BOOST_AUTO_TEST_CASE(echo_stress)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_echo_stress(), net::detached);
+   ioc.run();
+}
+
+#else
+int main(){}
+#endif

tests/conn_exec.cpp

@@ -0,0 +1,109 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/system/errc.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+
+#include "common.hpp"
+
+// TODO: Test whether HELLO won't be inserted passt commands that have
+// been already writen.
+
+namespace net = boost::asio;
+
+using aedis::resp3::request;
+using aedis::adapt;
+using connection = aedis::connection;
+using error_code = boost::system::error_code;
+
+BOOST_AUTO_TEST_CASE(wrong_response_data_type)
+{
+   request req;
+   req.push("HELLO", 3);
+   req.push("QUIT");
+
+   // Wrong data type.
+   std::tuple<aedis::ignore, int> resp;
+   net::io_context ioc;
+
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+   conn.async_exec(req, adapt(resp), [](auto ec, auto){
+      BOOST_CHECK_EQUAL(ec, aedis::error::not_a_number);
+   });
+   conn.async_run([](auto ec){
+      BOOST_CHECK_EQUAL(ec, boost::asio::error::basic_errors::operation_aborted);
+   });
+
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(cancel_request_if_not_connected)
+{
+   request req;
+   req.get_config().cancel_if_not_connected = true;
+   req.push("HELLO", 3);
+   req.push("PING");
+
+   net::io_context ioc;
+   auto conn = std::make_shared<connection>(ioc);
+   conn->async_exec(req, adapt(), [](auto ec, auto){
+      BOOST_CHECK_EQUAL(ec, aedis::error::not_connected);
+   });
+
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(request_retry)
+{
+   request req1;
+   req1.get_config().cancel_on_connection_lost = true;
+   req1.push("HELLO", 3);
+   req1.push("CLIENT", "PAUSE", 7000);
+
+   request req2;
+   req2.get_config().cancel_on_connection_lost = false;
+   req2.get_config().retry = false;
+   req2.push("PING");
+
+   net::io_context ioc;
+   connection conn{ioc};
+
+   net::steady_timer st{ioc};
+   st.expires_after(std::chrono::seconds{1});
+   st.async_wait([&](auto){
+      // Cancels the request before receiving the response. This
+      // should cause the second request to complete with error
+      // although it has cancel_on_connection_lost = false.
+      conn.cancel(aedis::operation::run);
+   });
+
+   auto const endpoints = resolve();
+   net::connect(conn.next_layer(), endpoints);
+
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_exec(req2, adapt(), [](auto ec, auto){
+      BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
+   });
+
+   conn.async_run([](auto ec){
+      BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
+   });
+
+   ioc.run();
+}

tests/conn_exec_cancel.cpp

@@ -0,0 +1,145 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/system/errc.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+
+#include "common.hpp"
+
+namespace net = boost::asio;
+
+using aedis::resp3::request;
+using aedis::operation;
+using aedis::adapt;
+using connection = aedis::connection;
+using error_code = boost::system::error_code;
+
+#include <boost/asio/experimental/awaitable_operators.hpp>
+using namespace net::experimental::awaitable_operators;
+
+auto async_run(std::shared_ptr<connection> conn, error_code expected) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+
+   boost::system::error_code ec;
+   co_await conn->async_run(net::redirect_error(net::use_awaitable, ec));
+   std::cout << ec.message() << std::endl;
+   BOOST_CHECK_EQUAL(ec, expected);
+}
+
+auto async_cancel_exec(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+
+   net::steady_timer st{ex};
+   st.expires_after(std::chrono::seconds{1});
+
+   boost::system::error_code ec1;
+
+   request req1;
+   req1.get_config().coalesce = false;
+   req1.push("HELLO", 3);
+   req1.push("BLPOP", "any", 3);
+
+   // Should not be canceled.
+   conn->async_exec(req1, adapt(), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   request req2;
+   req2.get_config().coalesce = false;
+   req2.push("PING", "second");
+
+   // Should be canceled.
+   conn->async_exec(req1, adapt(), [](auto ec, auto){
+      BOOST_CHECK_EQUAL(ec, net::error::basic_errors::operation_aborted);
+   });
+
+   // Will complete while BLPOP is pending.
+   co_await st.async_wait(net::redirect_error(net::use_awaitable, ec1));
+   conn->cancel(operation::exec);
+
+   BOOST_TEST(!ec1);
+
+   request req3;
+   req3.push("QUIT");
+
+   // Test whether the connection remains usable after a call to
+   // cancel(exec).
+   co_await conn->async_exec(req3, adapt(), net::redirect_error(net::use_awaitable, ec1));
+
+   BOOST_TEST(!ec1);
+}
+
+BOOST_AUTO_TEST_CASE(cancel_exec_with_timer)
+{
+   net::io_context ioc;
+
+   auto const endpoints = resolve();
+
+   auto conn = std::make_shared<connection>(ioc);
+   net::connect(conn->next_layer(), endpoints);
+
+   net::co_spawn(ioc.get_executor(), async_run(conn, {}), net::detached);
+   net::co_spawn(ioc.get_executor(), async_cancel_exec(conn), net::detached);
+   ioc.run();
+}
+
+auto async_ignore_cancel_of_written_req(std::shared_ptr<connection> conn) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+
+   net::steady_timer st{ex};
+   st.expires_after(std::chrono::seconds{1});
+
+   net::steady_timer st2{ex};
+   st2.expires_after(std::chrono::seconds{3});
+
+   boost::system::error_code ec1, ec2, ec3;
+
+   request req1; // Will be cancelled after it has been written.
+   req1.get_config().coalesce = false;
+   req1.push("HELLO", 3);
+   req1.push("BLPOP", "any", 3);
+
+   request req2; // Will be cancelled.
+   req2.push("PING");
+
+   co_await (
+      conn->async_exec(req1, adapt(), net::redirect_error(net::use_awaitable, ec1)) ||
+      conn->async_exec(req2, adapt(), net::redirect_error(net::use_awaitable, ec2)) ||
+      st.async_wait(net::redirect_error(net::use_awaitable, ec3))
+   );
+
+   BOOST_CHECK_EQUAL(ec1, net::error::basic_errors::operation_aborted);
+   BOOST_CHECK_EQUAL(ec2, net::error::basic_errors::operation_aborted);
+   BOOST_TEST(!ec3);
+}
+
+BOOST_AUTO_TEST_CASE(ignore_cancel_of_written_req)
+{
+   auto const endpoints = resolve();
+
+   net::io_context ioc;
+   auto conn = std::make_shared<connection>(ioc);
+   net::connect(conn->next_layer(), endpoints);
+
+   error_code expected = net::error::operation_aborted;
+   net::co_spawn(ioc.get_executor(), async_run(conn, expected), net::detached);
+   net::co_spawn(ioc.get_executor(), async_ignore_cancel_of_written_req(conn), net::detached);
+   ioc.run();
+}
+#else
+int main(){}
+#endif

tests/conn_push.cpp

@@ -0,0 +1,328 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/system/errc.hpp>
+#include <boost/asio/experimental/as_tuple.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+#include "common.hpp"
+
+namespace net = boost::asio;
+
+using aedis::resp3::request;
+using aedis::adapt;
+using aedis::operation;
+using connection = aedis::connection;
+using error_code = boost::system::error_code;
+using net::experimental::as_tuple;
+
+BOOST_AUTO_TEST_CASE(push_filtered_out)
+{
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+   request req;
+   req.push("HELLO", 3);
+   req.push("PING");
+   req.push("SUBSCRIBE", "channel");
+   req.push("QUIT");
+
+   std::tuple<aedis::ignore, std::string, std::string> resp;
+   conn.async_exec(req, adapt(resp), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_receive(adapt(), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_run([](auto ec){
+      std::cout << "===> " << ec.message() << std::endl;
+      BOOST_TEST(!ec);
+   });
+
+   ioc.run();
+
+   BOOST_CHECK_EQUAL(std::get<1>(resp), "PONG");
+   BOOST_CHECK_EQUAL(std::get<2>(resp), "OK");
+}
+
+void receive_wrong_syntax(request const& req)
+{
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+   conn.async_exec(req, adapt(), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_run([](auto ec){
+      BOOST_CHECK_EQUAL(ec, boost::asio::error::basic_errors::operation_aborted);
+   });
+
+   conn.async_receive(adapt(), [&](auto ec, auto){
+      BOOST_TEST(!ec);
+      conn.cancel(aedis::operation::run);
+   });
+
+   ioc.run();
+}
+
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+net::awaitable<void> push_consumer1(connection& conn, bool& push_received)
+{
+   {
+      auto [ec, ev] = co_await conn.async_receive(adapt(), as_tuple(net::use_awaitable));
+      BOOST_TEST(!ec);
+   }
+
+   {
+      auto [ec, ev] = co_await conn.async_receive(adapt(), as_tuple(net::use_awaitable));
+      BOOST_CHECK_EQUAL(ec, net::experimental::channel_errc::channel_cancelled);
+   }
+
+   push_received = true;
+}
+
+struct adapter_error {
+   void
+   operator()(
+      std::size_t, aedis::resp3::node<boost::string_view> const&, boost::system::error_code& ec)
+   {
+      ec = aedis::error::incompatible_size;
+   }
+
+   [[nodiscard]]
+   auto get_supported_response_size() const noexcept
+      { return static_cast<std::size_t>(-1);}
+
+   [[nodiscard]]
+   auto get_max_read_size(std::size_t) const noexcept
+      { return static_cast<std::size_t>(-1);}
+};
+
+BOOST_AUTO_TEST_CASE(test_push_adapter)
+{
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+   request req;
+   req.push("HELLO", 3);
+   req.push("PING");
+   req.push("SUBSCRIBE", "channel");
+   req.push("PING");
+
+   conn.async_receive(adapter_error{}, [](auto ec, auto) {
+      BOOST_CHECK_EQUAL(ec, aedis::error::incompatible_size);
+   });
+
+   conn.async_exec(req, adapt(), [](auto ec, auto){
+      BOOST_CHECK_EQUAL(ec, net::experimental::error::channel_errors::channel_cancelled);
+   });
+
+   conn.async_run([](auto ec){
+      BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
+   });
+
+   ioc.run();
+
+   // TODO: Reset the ioc reconnect and send a quit to ensure
+   // reconnection is possible after an error.
+}
+
+void test_push_is_received1(bool coalesce)
+{
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+
+   request req{{false, coalesce}};
+   req.push("HELLO", 3);
+   req.push("SUBSCRIBE", "channel");
+   req.push("QUIT");
+
+   conn.async_exec(req, adapt(), [](auto ec, auto){
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_run([&](auto ec){
+      BOOST_TEST(!ec);
+      conn.cancel(operation::receive);
+   });
+
+   bool push_received = false;
+   net::co_spawn(
+      ioc.get_executor(),
+      push_consumer1(conn, push_received),
+      net::detached);
+
+   ioc.run();
+
+   BOOST_TEST(push_received);
+}
+
+void test_push_is_received2(bool coalesce)
+{
+   request req1{{false, coalesce}};
+   req1.push("HELLO", 3);
+   req1.push("PING", "Message1");
+
+   request req2{{false, coalesce}};
+   req2.push("SUBSCRIBE", "channel");
+
+   request req3{{false, coalesce}};
+   req3.push("PING", "Message2");
+   req3.push("QUIT");
+
+   net::io_context ioc;
+
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+
+   auto handler =[](auto ec, auto...)
+   {
+      BOOST_TEST(!ec);
+   };
+
+   conn.async_exec(req1, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req3, adapt(), handler);
+
+   conn.async_run([&](auto ec) {
+      BOOST_TEST(!ec);
+      conn.cancel(operation::receive);
+   });
+
+   bool push_received = false;
+   net::co_spawn(
+      ioc.get_executor(),
+      push_consumer1(conn, push_received),
+      net::detached);
+
+   ioc.run();
+
+   BOOST_TEST(push_received);
+}
+
+net::awaitable<void> push_consumer3(connection& conn)
+{
+   for (;;)
+      co_await conn.async_receive(adapt(), net::use_awaitable);
+}
+
+// Test many subscribe requests.
+void test_push_many_subscribes(bool coalesce)
+{
+   request req0{{false, coalesce}};
+   req0.push("HELLO", 3);
+
+   request req1{{false, coalesce}};
+   req1.push("PING", "Message1");
+
+   request req2{{false, coalesce}};
+   req2.push("SUBSCRIBE", "channel");
+
+   request req3{{false, coalesce}};
+   req3.push("QUIT");
+
+   auto handler =[](auto ec, auto...)
+   {
+      BOOST_TEST(!ec);
+   };
+
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+   conn.async_exec(req0, adapt(), handler);
+   conn.async_exec(req1, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req1, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req1, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req1, adapt(), handler);
+   conn.async_exec(req2, adapt(), handler);
+   conn.async_exec(req3, adapt(), handler);
+
+   conn.async_run([&](auto ec) {
+      BOOST_TEST(!ec);
+      conn.cancel(operation::receive);
+   });
+
+   net::co_spawn(ioc.get_executor(), push_consumer3(conn), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(push_received1)
+{
+   test_push_is_received1(true);
+   test_push_is_received1(false);
+}
+
+BOOST_AUTO_TEST_CASE(push_received2)
+{
+   test_push_is_received2(true);
+   test_push_is_received2(false);
+}
+
+BOOST_AUTO_TEST_CASE(many_subscribers)
+{
+   test_push_many_subscribes(true);
+   test_push_many_subscribes(false);
+}
+#endif
+
+BOOST_AUTO_TEST_CASE(receive_wrong_syntax1)
+{
+   request req1{{false}};
+   req1.push("HELLO", 3);
+   req1.push("PING", "Message");
+   req1.push("SUBSCRIBE"); // Wrong command synthax.
+
+   req1.get_config().coalesce = true;
+   receive_wrong_syntax(req1);
+
+   req1.get_config().coalesce = false;
+   receive_wrong_syntax(req1);
+}
+
+BOOST_AUTO_TEST_CASE(receice_wrong_syntay2)
+{
+   request req2{{false}};
+   req2.push("HELLO", 3);
+   req2.push("SUBSCRIBE"); // Wrong command syntax.
+
+   req2.get_config().coalesce = true;
+   receive_wrong_syntax(req2);
+
+   req2.get_config().coalesce = false;
+   receive_wrong_syntax(req2);
+}
+
+#else
+int main() {}
+#endif

tests/conn_quit.cpp

@@ -13,13 +13,13 @@
 
 #include <aedis.hpp>
 #include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
 
 using aedis::adapt;
-using aedis::endpoint;
 using aedis::resp3::request;
-using connection = aedis::connection<>;
+using connection = aedis::connection;
 using error_code = boost::system::error_code;
 using operation = aedis::operation;
 
@@ -27,34 +27,37 @@ using operation = aedis::operation;
 BOOST_AUTO_TEST_CASE(test_quit_no_coalesce)
 {
    net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
+
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
 
    request req1{{false, false}};
+   req1.push("HELLO", 3);
    req1.push("PING");
 
    request req2{{false, false}};
    req2.push("QUIT");
 
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_TEST(!ec);
    });
-   db->async_exec(req2, adapt(), [](auto ec, auto) {
+   conn.async_exec(req2, adapt(), [](auto ec, auto) {
       BOOST_TEST(!ec);
    });
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
    });
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
          BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
    });
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
    });
 
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, {}, [db](auto ec){
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-      db->cancel(operation::exec);
+   conn.async_run([&](auto ec){
+      BOOST_TEST(!ec);
+      conn.cancel(operation::exec);
    });
 
    ioc.run();
@@ -63,13 +66,21 @@ BOOST_AUTO_TEST_CASE(test_quit_no_coalesce)
 void test_quit2(bool coalesce)
 {
    request req{{false, coalesce}};
+   req.push("HELLO", 3);
    req.push("QUIT");
 
    net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [](auto ec, auto) {
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+
+   conn.async_exec(req, adapt(), [](auto ec, auto) {
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_run([](auto ec) {
+      BOOST_TEST(!ec);
    });
 
    ioc.run();
@@ -77,7 +88,6 @@ void test_quit2(bool coalesce)
 
 BOOST_AUTO_TEST_CASE(test_quit)
 {
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
    test_quit2(true);
    test_quit2(false);
 }

tests/conn_quit_coalesce.cpp

@@ -13,44 +13,46 @@
 
 #include <aedis.hpp>
 #include <aedis/src.hpp>
+#include "common.hpp"
 
 namespace net = boost::asio;
 
 using aedis::adapt;
-using aedis::endpoint;
 using aedis::resp3::request;
-using connection = aedis::connection<>;
+using connection = aedis::connection;
 using error_code = boost::system::error_code;
 using operation = aedis::operation;
 
 BOOST_AUTO_TEST_CASE(test_quit_coalesce)
 {
    net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
 
    request req1{{false, true}};
+   req1.push("HELLO", 3);
    req1.push("PING");
 
    request req2{{false, true}};
    req2.push("QUIT");
 
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_TEST(!ec);
    });
-   db->async_exec(req2, adapt(), [](auto ec, auto){
+   conn.async_exec(req2, adapt(), [](auto ec, auto){
       BOOST_TEST(!ec);
    });
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
    });
-   db->async_exec(req1, adapt(), [](auto ec, auto){
+   conn.async_exec(req1, adapt(), [](auto ec, auto){
       BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
    });
 
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, {}, [db](auto ec){
+   conn.async_run([&](auto ec){
       BOOST_CHECK_EQUAL(ec, boost::system::errc::errc_t::operation_canceled);
-      db->cancel(operation::exec);
+      conn.cancel(operation::exec);
    });
 
    ioc.run();

tests/conn_reconnect.cpp

@@ -0,0 +1,119 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+#include "common.hpp"
+
+namespace net = boost::asio;
+
+using aedis::resp3::request;
+using aedis::adapt;
+using connection = aedis::connection;
+using error_code = boost::system::error_code;
+
+#include <boost/asio/experimental/awaitable_operators.hpp>
+using namespace boost::asio::experimental::awaitable_operators;
+
+net::awaitable<void> test_reconnect_impl()
+{
+   auto ex = co_await net::this_coro::executor;
+
+   request req;
+   req.push("QUIT");
+
+   auto const endpoints = resolve();
+   connection conn{ex};
+
+   int i = 0;
+   for (; i < 5; ++i) {
+      boost::system::error_code ec1, ec2;
+      net::connect(conn.next_layer(), endpoints);
+      co_await (
+         conn.async_exec(req, adapt(), net::redirect_error(net::use_awaitable, ec1)) &&
+         conn.async_run(net::redirect_error(net::use_awaitable, ec2))
+      );
+
+      BOOST_TEST(!ec1);
+      BOOST_TEST(!ec2);
+      conn.reset_stream();
+   }
+
+   BOOST_CHECK_EQUAL(i, 5);
+   co_return;
+}
+
+// Test whether the client works after a reconnect.
+BOOST_AUTO_TEST_CASE(test_reconnect)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, test_reconnect_impl(), net::detached);
+   ioc.run();
+}
+
+auto async_test_reconnect_timeout() -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+
+   net::steady_timer st{ex};
+
+   auto conn = std::make_shared<connection>(ex);
+   auto const endpoints = resolve();
+
+   boost::system::error_code ec1, ec2, ec3;
+
+   request req1;
+   req1.get_config().cancel_if_not_connected = false;
+   req1.get_config().cancel_on_connection_lost = true;
+   req1.push("HELLO", 3);
+   req1.push("CLIENT", "PAUSE", 7000);
+
+   net::connect(conn->next_layer(), endpoints);
+   st.expires_after(std::chrono::seconds{1});
+   co_await (
+      conn->async_exec(req1, adapt(), net::redirect_error(net::use_awaitable, ec1)) ||
+      conn->async_run(net::redirect_error(net::use_awaitable, ec2)) ||
+      st.async_wait(net::redirect_error(net::use_awaitable, ec3))
+   );
+
+   BOOST_TEST(!ec1);
+   BOOST_CHECK_EQUAL(ec2, boost::system::errc::errc_t::operation_canceled);
+   //BOOST_TEST(!ec3);
+
+   request req2;
+   req2.get_config().cancel_if_not_connected = false;
+   req2.get_config().cancel_on_connection_lost = true;
+   req2.push("HELLO", 3);
+   req2.push("QUIT");
+
+   net::connect(conn->next_layer(), endpoints);
+   st.expires_after(std::chrono::seconds{1});
+   co_await (
+      conn->async_exec(req1, adapt(), net::redirect_error(net::use_awaitable, ec1)) ||
+      conn->async_run(net::redirect_error(net::use_awaitable, ec2)) ||
+      st.async_wait(net::redirect_error(net::use_awaitable, ec3))
+   );
+
+   BOOST_CHECK_EQUAL(ec1, boost::system::errc::errc_t::operation_canceled);
+   BOOST_CHECK_EQUAL(ec2, boost::asio::error::basic_errors::operation_aborted);
+}
+
+BOOST_AUTO_TEST_CASE(test_reconnect_and_idle)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_test_reconnect_timeout(), net::detached);
+   ioc.run();
+}
+#else
+int main(){}
+#endif

tests/conn_run_cancel.cpp

@@ -0,0 +1,179 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#ifdef BOOST_ASIO_HAS_CO_AWAIT
+#include <boost/system/errc.hpp>
+#include <boost/asio/experimental/as_tuple.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+#include "common.hpp"
+
+namespace net = boost::asio;
+
+using aedis::resp3::request;
+using aedis::operation;
+using aedis::adapt;
+using connection = aedis::connection;
+using error_code = boost::system::error_code;
+using net::experimental::as_tuple;
+
+#include <boost/asio/experimental/awaitable_operators.hpp>
+using namespace net::experimental::awaitable_operators;
+
+auto async_cancel_run_with_timer() -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+   auto const endpoints = resolve();
+   connection conn{ex};
+   net::connect(conn.next_layer(), endpoints);
+
+   net::steady_timer st{ex};
+   st.expires_after(std::chrono::seconds{1});
+
+   boost::system::error_code ec1, ec2;
+   co_await (
+      conn.async_run(net::redirect_error(net::use_awaitable, ec1)) ||
+      st.async_wait(net::redirect_error(net::use_awaitable, ec2))
+   );
+
+   BOOST_CHECK_EQUAL(ec1, boost::asio::error::basic_errors::operation_aborted);
+   BOOST_TEST(!ec2);
+}
+
+BOOST_AUTO_TEST_CASE(cancel_run_with_timer)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc.get_executor(), async_cancel_run_with_timer(), net::detached);
+   ioc.run();
+}
+
+auto
+async_check_cancellation_not_missed(int n, std::chrono::milliseconds ms) -> net::awaitable<void>
+{
+   auto ex = co_await net::this_coro::executor;
+   auto const endpoints = resolve();
+   connection conn{ex};
+
+   net::steady_timer timer{ex};
+
+   for (auto i = 0; i < n; ++i) {
+      timer.expires_after(ms);
+      net::connect(conn.next_layer(), endpoints);
+      boost::system::error_code ec1, ec2;
+      co_await (
+         conn.async_run(net::redirect_error(net::use_awaitable, ec1)) ||
+         timer.async_wait(net::redirect_error(net::use_awaitable, ec2))
+      );
+      BOOST_CHECK_EQUAL(ec1, boost::asio::error::basic_errors::operation_aborted);
+      std::cout << "Counter: " << i << std::endl;
+   }
+}
+
+// See PR #29
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_0)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(10, std::chrono::milliseconds{0}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_2)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{2}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_8)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{8}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_16)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{16}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_32)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{32}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_64)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{64}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_128)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{128}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_256)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{256}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_512)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{512}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(check_implicit_cancel_not_missed_1024)
+{
+   net::io_context ioc;
+   net::co_spawn(ioc, async_check_cancellation_not_missed(20, std::chrono::milliseconds{1024}), net::detached);
+   ioc.run();
+}
+
+BOOST_AUTO_TEST_CASE(reset_before_run_completes)
+{
+   net::io_context ioc;
+   auto const endpoints = resolve();
+   connection conn{ioc};
+   net::connect(conn.next_layer(), endpoints);
+
+
+   // Sends a ping just as a means of waiting until we are connected.
+   request req;
+   req.push("HELLO", 3);
+   req.push("PING");
+
+   conn.async_exec(req, adapt(), [&](auto ec, auto){
+      BOOST_TEST(!ec);
+      conn.reset_stream();
+   });
+
+   conn.async_run([&](auto ec){
+      BOOST_CHECK_EQUAL(ec, net::error::operation_aborted);
+   });
+
+   ioc.run();
+}
+
+#else
+int main(){}
+#endif

tests/conn_tls.cpp

@@ -0,0 +1,72 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/asio/ssl.hpp>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/ssl/connection.hpp>
+#include <aedis/src.hpp>
+#include "common.hpp"
+
+namespace net = boost::asio;
+
+using aedis::adapt;
+using aedis::resp3::request;
+using connection = aedis::ssl::connection;
+
+struct endpoint {
+   std::string host;
+   std::string port;
+};
+
+bool verify_certificate(bool, net::ssl::verify_context&)
+{
+   std::cout << "set_verify_callback" << std::endl;
+   return true;
+}
+
+BOOST_AUTO_TEST_CASE(ping)
+{
+   std::string const in = "Kabuf";
+
+   request req;
+   req.get_config().cancel_on_connection_lost = true;
+   req.push("HELLO", 3, "AUTH", "aedis", "aedis");
+   req.push("PING", in);
+   req.push("QUIT");
+
+   std::string out;
+   auto resp = std::tie(std::ignore, out, std::ignore);
+
+   auto const endpoints = resolve("db.occase.de", "6380");
+
+   net::io_context ioc;
+   net::ssl::context ctx{net::ssl::context::sslv23};
+   connection conn{ioc, ctx};
+   conn.next_layer().set_verify_mode(net::ssl::verify_peer);
+   conn.next_layer().set_verify_callback(verify_certificate);
+
+   net::connect(conn.lowest_layer(), endpoints);
+   conn.next_layer().handshake(net::ssl::stream_base::client);
+
+   conn.async_exec(req, adapt(resp), [](auto ec, auto) {
+      BOOST_TEST(!ec);
+   });
+
+   conn.async_run([](auto ec) {
+      BOOST_TEST(!ec);
+   });
+
+   ioc.run();
+
+   BOOST_CHECK_EQUAL(in, out);
+}
+

tests/connection_connect.cpp

@@ -1,153 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <iostream>
-#include <boost/asio.hpp>
-#include <boost/system/errc.hpp>
-
-#define BOOST_TEST_MODULE low level
-#include <boost/test/included/unit_test.hpp>
-
-#include <aedis.hpp>
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-
-using connection = aedis::connection<>;
-using endpoint = aedis::endpoint;
-using error_code = boost::system::error_code;
-
-bool is_host_not_found(error_code ec)
-{
-   if (ec == net::error::netdb_errors::host_not_found) return true;
-   if (ec == net::error::netdb_errors::host_not_found_try_again) return true;
-   return false;
-}
-
-error_code test_async_run(endpoint ep, connection::timeouts cfg = {})
-{
-   net::io_context ioc;
-   connection db{ioc};
-   error_code ret;
-   db.async_run(ep, cfg, [&](auto ec) { ret = ec; });
-   ioc.run();
-   return ret;
-}
-
-// Tests whether resolve fails with the correct error.
-BOOST_AUTO_TEST_CASE(test_resolve)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "Atibaia";
-   ep.port = "6379";
-
-   connection::timeouts cfg;
-   cfg.resolve_timeout = std::chrono::seconds{100};
-   auto const ec = test_async_run(ep, cfg);
-
-   BOOST_TEST(is_host_not_found(ec));
-}
-
-BOOST_AUTO_TEST_CASE(test_resolve_with_timeout)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "Atibaia";
-   ep.port = "6379";
-
-   connection::timeouts cfg;
-   // Low-enough to cause a timeout always.
-   cfg.resolve_timeout = std::chrono::milliseconds{1};
-   auto const ec = test_async_run(ep, cfg);
-   BOOST_CHECK_EQUAL(ec, aedis::error::resolve_timeout);
-}
-
-BOOST_AUTO_TEST_CASE(test_connect)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "127.0.0.1";
-   ep.port = "1";
-
-   connection::timeouts cfg;
-   cfg.connect_timeout = std::chrono::seconds{100};
-   auto const ec = test_async_run(ep, cfg);
-   BOOST_CHECK_EQUAL(ec, net::error::basic_errors::connection_refused);
-}
-
-BOOST_AUTO_TEST_CASE(test_connect_timeout)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "example.com";
-   ep.port = "1";
-
-   connection::timeouts cfg;
-   cfg.connect_timeout = std::chrono::milliseconds{1};
-   auto const ec = test_async_run(ep, cfg);
-   BOOST_CHECK_EQUAL(ec, aedis::error::connect_timeout);
-}
-
-BOOST_AUTO_TEST_CASE(test_hello_fail)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   // Succeeds with the tcp connection but fails the hello.
-   endpoint ep;
-   ep.host = "google.com";
-   ep.port = "80";
-
-   auto const ec = test_async_run(ep);
-   BOOST_CHECK_EQUAL(ec, aedis::error::invalid_data_type);
-}
-
-BOOST_AUTO_TEST_CASE(test_hello_tls_over_plain_fail)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "google.com";
-   ep.port = "443";
-
-   auto const ec = test_async_run(ep);
-   BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-}
-
-BOOST_AUTO_TEST_CASE(test_auth_fail)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   // Should cause an error in the authentication as our redis server
-   // has no authentication configured.
-   endpoint ep;
-   ep.host = "127.0.0.1";
-   ep.port = "6379";
-   ep.username = "caboclo-do-mato";
-   ep.password = "jabuticaba";
-
-   auto const ec = test_async_run(ep);
-   BOOST_CHECK_EQUAL(ec, aedis::error::resp3_simple_error);
-}
-
-BOOST_AUTO_TEST_CASE(test_wrong_role)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   // Should cause an error in the authentication as our redis server
-   // has no authentication configured.
-   endpoint ep;
-   ep.host = "127.0.0.1";
-   ep.port = "6379";
-   ep.role = "errado";
-
-   auto const ec = test_async_run(ep);
-   BOOST_CHECK_EQUAL(ec, aedis::error::unexpected_server_role);
-}

tests/connection_other.cpp

@@ -1,152 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <iostream>
-#include <boost/asio.hpp>
-#include <boost/system/errc.hpp>
-#include <boost/asio/experimental/as_tuple.hpp>
-
-#define BOOST_TEST_MODULE low level
-#include <boost/test/included/unit_test.hpp>
-
-#include <aedis.hpp>
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-
-using aedis::resp3::request;
-using aedis::adapt;
-using connection = aedis::connection<>;
-using endpoint = aedis::endpoint;
-using error_code = boost::system::error_code;
-using net::experimental::as_tuple;
-
-#ifdef BOOST_ASIO_HAS_CO_AWAIT
-#include <boost/asio/experimental/awaitable_operators.hpp>
-using namespace net::experimental::awaitable_operators;
-
-net::awaitable<void> send_after(std::shared_ptr<connection> db, std::chrono::milliseconds ms)
-{
-   net::steady_timer st{co_await net::this_coro::executor};
-   st.expires_after(ms);
-   co_await st.async_wait(net::use_awaitable);
-
-   request req;
-   req.push("CLIENT", "PAUSE", ms.count());
-
-   auto [ec, n] = co_await db->async_exec(req, adapt(), as_tuple(net::use_awaitable));
-   BOOST_TEST(!ec);
-}
-
-BOOST_AUTO_TEST_CASE(test_idle)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-   std::chrono::milliseconds ms{5000};
-
-   {
-      std::cout << "test_idle" << std::endl;
-      connection::timeouts cfg;
-      cfg.resolve_timeout = std::chrono::seconds{1};
-      cfg.connect_timeout = std::chrono::seconds{1};
-      cfg.ping_interval = std::chrono::seconds{1};
-
-      net::io_context ioc;
-      auto db = std::make_shared<connection>(ioc);
-
-      net::co_spawn(ioc.get_executor(), send_after(db, ms), net::detached);
-
-      endpoint ep{"127.0.0.1", "6379"};
-      db->async_run(ep, cfg, [](auto ec){
-         BOOST_CHECK_EQUAL(ec, aedis::error::idle_timeout);
-      });
-
-      ioc.run();
-   }
-
-   //----------------------------------------------------------------
-   // Since we have paused the server above, we have to wait until the
-   // server is responsive again, so as not to cause other tests to
-   // fail.
-
-   {
-      net::io_context ioc;
-      auto db = std::make_shared<connection>(ioc);
-      connection::timeouts cfg;
-      cfg.ping_interval = 2 * ms;
-      cfg.resolve_timeout = 2 * ms;
-      cfg.connect_timeout = 2 * ms;
-      cfg.ping_interval = 2 * ms;
-      cfg.resp3_handshake_timeout = 2 * ms;
-
-      request req;
-      req.push("QUIT");
-
-      endpoint ep{"127.0.0.1", "6379"};
-      db->async_run(ep, req, adapt(), cfg, [](auto ec, auto){
-         BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-      });
-
-      ioc.run();
-   }
-}
-
-net::awaitable<void> reconnect(std::shared_ptr<connection> db)
-{
-   net::steady_timer timer{co_await net::this_coro::executor};
-   for (auto i = 0; i < 1000; ++i) {
-      timer.expires_after(std::chrono::milliseconds{10});
-      endpoint ep{"127.0.0.1", "6379"};
-      co_await (
-         db->async_run(ep, {}, net::use_awaitable) ||
-         timer.async_wait(net::use_awaitable)
-      );
-      std::cout << i << ": Retrying" << std::endl;
-   }
-   std::cout << "Finished" << std::endl;
-}
-
-BOOST_AUTO_TEST_CASE(test_cancelation)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   net::co_spawn(ioc, reconnect(db), net::detached);
-   ioc.run();
-}
-#endif
-
-BOOST_AUTO_TEST_CASE(test_wrong_data_type)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-   request req;
-   req.push("QUIT");
-
-   // Wrong data type.
-   std::tuple<int> resp;
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(resp), {}, [](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::not_a_number);
-   });
-
-   ioc.run();
-}
-
-BOOST_AUTO_TEST_CASE(test_not_connected)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-   request req{{true}};
-   req.push("PING");
-
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   db->async_exec(req, adapt(), [](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::not_connected);
-   });
-
-   ioc.run();
-}

tests/connection_push.cpp

@@ -1,277 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <iostream>
-#include <boost/asio.hpp>
-#include <boost/system/errc.hpp>
-#include <boost/asio/experimental/as_tuple.hpp>
-
-#define BOOST_TEST_MODULE low level
-#include <boost/test/included/unit_test.hpp>
-
-#include <aedis.hpp>
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-
-using aedis::resp3::request;
-using aedis::adapt;
-using aedis::endpoint;
-using aedis::operation;
-using connection = aedis::connection<>;
-using error_code = boost::system::error_code;
-using net::experimental::as_tuple;
-
-// Checks whether we get idle timeout when no push reader is set.
-void test_missing_push_reader1(bool coalesce)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req{{false, coalesce}};
-   req.push("SUBSCRIBE", "channel");
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::idle_timeout);
-   });
-
-   ioc.run();
-}
-
-void test_missing_push_reader2(bool coalesce)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req{{false, coalesce}}; // Wrong command syntax.
-   req.push("SUBSCRIBE");
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::idle_timeout);
-   });
-
-   ioc.run();
-}
-
-void test_missing_push_reader3(bool coalesce)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req{{false, coalesce}}; // Wrong command synthax.
-   req.push("PING", "Message");
-   req.push("SUBSCRIBE");
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::idle_timeout);
-   });
-
-   ioc.run();
-}
-
-#ifdef BOOST_ASIO_HAS_CO_AWAIT
-net::awaitable<void> push_consumer1(std::shared_ptr<connection> db, bool& push_received)
-{
-   {
-      auto [ec, ev] = co_await db->async_receive_push(adapt(), as_tuple(net::use_awaitable));
-      BOOST_TEST(!ec);
-   }
-
-   {
-      auto [ec, ev] = co_await db->async_receive_push(adapt(), as_tuple(net::use_awaitable));
-      BOOST_CHECK_EQUAL(ec, boost::asio::experimental::channel_errc::channel_cancelled);
-   }
-
-   push_received = true;
-}
-
-struct adapter_error {
-   void
-   operator()(
-      std::size_t, aedis::resp3::node<boost::string_view> const&, boost::system::error_code& ec)
-   {
-      ec = aedis::error::incompatible_size;
-   }
-
-   [[nodiscard]]
-   auto get_supported_response_size() const noexcept
-      { return static_cast<std::size_t>(-1);}
-
-   [[nodiscard]]
-   auto get_max_read_size(std::size_t) const noexcept
-      { return static_cast<std::size_t>(-1);}
-};
-
-BOOST_AUTO_TEST_CASE(test_push_adapter)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req;
-   req.push("PING");
-   req.push("SUBSCRIBE", "channel");
-   req.push("PING");
-
-   db->async_receive_push(adapter_error{}, [](auto ec, auto) {
-      BOOST_CHECK_EQUAL(ec, aedis::error::incompatible_size);
-   });
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [db](auto, auto){
-      //BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-   });
-
-   ioc.run();
-
-   // TODO: Reset the ioc reconnect and send a quit to ensure
-   // reconnection is possible after an error.
-}
-
-void test_push_is_received1(bool coalesce)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req{{false, coalesce}};
-   req.push("SUBSCRIBE", "channel");
-   req.push("QUIT");
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req, adapt(), {}, [db](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-      db->cancel(operation::receive_push);
-   });
-
-   bool push_received = false;
-   net::co_spawn(
-      ioc.get_executor(),
-      push_consumer1(db, push_received),
-      net::detached);
-
-   ioc.run();
-
-   BOOST_TEST(push_received);
-}
-
-void test_push_is_received2(bool coalesce)
-{
-   request req1{{false, coalesce}};
-   req1.push("PING", "Message1");
-
-   request req2{{false, coalesce}};
-   req2.push("SUBSCRIBE", "channel");
-
-   request req3{{false, coalesce}};
-   req3.push("PING", "Message2");
-   req3.push("QUIT");
-
-   net::io_context ioc;
-
-   auto db = std::make_shared<connection>(ioc);
-
-   auto handler =[](auto ec, auto...)
-   {
-      BOOST_TEST(!ec);
-   };
-
-   db->async_exec(req1, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req3, adapt(), handler);
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, {}, [db](auto ec, auto...) {
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-      db->cancel(operation::receive_push);
-   });
-
-   bool push_received = false;
-   net::co_spawn(
-      ioc.get_executor(),
-      push_consumer1(db, push_received),
-      net::detached);
-
-   ioc.run();
-
-   BOOST_TEST(push_received);
-}
-
-net::awaitable<void> push_consumer3(std::shared_ptr<connection> db)
-{
-   for (;;)
-      co_await db->async_receive_push(adapt(), net::use_awaitable);
-}
-
-// Test many subscribe requests.
-void test_push_many_subscribes(bool coalesce)
-{
-   request req0{{false, coalesce}};
-   req0.push("HELLO", 3);
-
-   request req1{{false, coalesce}};
-   req1.push("PING", "Message1");
-
-   request req2{{false, coalesce}};
-   req2.push("SUBSCRIBE", "channel");
-
-   request req3{{false, coalesce}};
-   req3.push("QUIT");
-
-   auto handler =[](auto ec, auto...)
-   {
-      BOOST_TEST(!ec);
-   };
-
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   db->async_exec(req0, adapt(), handler);
-   db->async_exec(req1, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req1, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req1, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req1, adapt(), handler);
-   db->async_exec(req2, adapt(), handler);
-   db->async_exec(req3, adapt(), handler);
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, {}, [db](auto ec, auto...) {
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-      db->cancel(operation::receive_push);
-   });
-
-   net::co_spawn(ioc.get_executor(), push_consumer3(db), net::detached);
-   ioc.run();
-}
-
-#endif
-
-BOOST_AUTO_TEST_CASE(test_push)
-{
-#ifdef BOOST_ASIO_HAS_CO_AWAIT
-   test_push_is_received1(true);
-   test_push_is_received2(true);
-   test_push_many_subscribes(true);
-#endif
-   test_missing_push_reader1(true);
-   test_missing_push_reader2(false);
-   test_missing_push_reader3(true);
-
-#ifdef BOOST_ASIO_HAS_CO_AWAIT
-   test_push_is_received1(true);
-   test_push_is_received2(false);
-   test_push_many_subscribes(false);
-#endif
-   test_missing_push_reader1(true);
-   test_missing_push_reader2(false);
-   test_missing_push_reader3(false);
-}
-

tests/connection_reconnect.cpp

@@ -1,77 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <iostream>
-#include <boost/asio.hpp>
-
-#define BOOST_TEST_MODULE low level
-#include <boost/test/included/unit_test.hpp>
-
-#include <aedis.hpp>
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-
-using aedis::resp3::request;
-using aedis::adapt;
-using connection = aedis::connection<>;
-using endpoint = aedis::endpoint;
-using error_code = boost::system::error_code;
-
-#ifdef BOOST_ASIO_HAS_CO_AWAIT
-
-net::awaitable<void> test_reconnect_impl(std::shared_ptr<connection> db)
-{
-   request req;
-   req.push("QUIT");
-
-   int i = 0;
-   endpoint ep{"127.0.0.1", "6379"};
-   for (; i < 5; ++i) {
-      boost::system::error_code ec;
-      co_await db->async_run(ep, req, adapt(), {}, net::redirect_error(net::use_awaitable, ec));
-      db->reset_stream();
-      BOOST_CHECK_EQUAL(ec, net::error::misc_errors::eof);
-   }
-
-   BOOST_CHECK_EQUAL(i, 5);
-   co_return;
-}
-
-// Test whether the client works after a reconnect.
-BOOST_AUTO_TEST_CASE(test_reconnect)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-   net::co_spawn(ioc, test_reconnect_impl(db), net::detached);
-   ioc.run();
-}
-
-#endif
-
-BOOST_AUTO_TEST_CASE(test_reconnect_timeout)
-{
-   net::io_context ioc;
-   auto db = std::make_shared<connection>(ioc);
-
-   request req1;
-   req1.push("CLIENT", "PAUSE", 7000);
-
-   request req2;
-   req2.push("QUIT");
-
-   endpoint ep{"127.0.0.1", "6379"};
-   db->async_run(ep, req1, adapt(), {}, [db, &req2, &ep](auto ec, auto){
-      BOOST_CHECK_EQUAL(ec, aedis::error::idle_timeout);
-      db->reset_stream();
-      db->async_run(ep, req2, adapt(), {}, [db](auto ec, auto){
-         BOOST_CHECK_EQUAL(ec, aedis::error::exec_timeout);
-      });
-   });
-
-   ioc.run();
-}

tests/connection_tls.cpp

@@ -1,80 +0,0 @@
-/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
- *
- * Distributed under the Boost Software License, Version 1.0. (See
- * accompanying file LICENSE.txt)
- */
-
-#include <iostream>
-#include <boost/asio.hpp>
-#include <boost/asio/ssl.hpp>
-
-#define BOOST_TEST_MODULE low level
-#include <boost/test/included/unit_test.hpp>
-
-#include <aedis.hpp>
-#include <aedis/ssl/connection.hpp>
-#include <aedis/src.hpp>
-
-namespace net = boost::asio;
-
-using aedis::adapt;
-using connection = aedis::ssl::connection<net::ssl::stream<net::ip::tcp::socket>>;
-using endpoint = aedis::endpoint;
-
-bool verify_certificate(bool, net::ssl::verify_context&)
-{
-   std::cout << "set_verify_callback" << std::endl;
-   return true;
-}
-
-boost::system::error_code hello_fail(endpoint ep)
-{
-   net::io_context ioc;
-
-   net::ssl::context ctx{net::ssl::context::sslv23};
-   auto conn = std::make_shared<connection>(ioc.get_executor(), ctx);
-   conn->next_layer().set_verify_mode(net::ssl::verify_peer);
-   conn->next_layer().set_verify_callback(verify_certificate);
-   boost::system::error_code ret;
-   conn->async_run(ep, {}, [&](auto ec) {
-      ret = ec;
-   });
-
-   ioc.run();
-   return ret;
-}
-
-BOOST_AUTO_TEST_CASE(test_tls_handshake_fail)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "google.com";
-   ep.port = "80";
-   auto const ec = hello_fail(ep);
-   BOOST_TEST(!!ec);
-   std::cout << "-----> " << ec.message() << std::endl;
-}
-
-BOOST_AUTO_TEST_CASE(test_tls_handshake_fail2)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "127.0.0.1";
-   ep.port = "6379";
-   auto const ec = hello_fail(ep);
-   BOOST_CHECK_EQUAL(ec, aedis::error::ssl_handshake_timeout);
-}
-
-BOOST_AUTO_TEST_CASE(test_hello_fail)
-{
-   std::cout << boost::unit_test::framework::current_test_case().p_name << std::endl;
-
-   endpoint ep;
-   ep.host = "google.com";
-   ep.port = "443";
-   auto const ec = hello_fail(ep);
-   BOOST_CHECK_EQUAL(ec, aedis::error::invalid_data_type);
-}
-

tests/low_level.cpp

@@ -24,6 +24,13 @@
 
 // TODO: Test with empty strings.
 
+
+namespace std
+{
+auto operator==(aedis::ignore, aedis::ignore) noexcept {return true;}
+auto operator!=(aedis::ignore, aedis::ignore) noexcept {return false;}
+}
+
 namespace net = boost::asio;
 namespace resp3 = aedis::resp3;
 
@@ -112,7 +119,8 @@ void test_async(net::any_io_executor ex, expect<Result> e)
 std::optional<int> op_int_ok = 11;
 std::optional<bool> op_bool_ok = true;
 
-std::string const streamed_string_wire = "$?\r\n;4\r\nHell\r\n;5\r\no wor\r\n;1\r\nd\r\n;0\r\n";
+// TODO: Test a streamed string that is not finished with a string of
+// size 0 but other command comes in.
 std::vector<node_type> streamed_string_e1
 { {aedis::resp3::type::streamed_string_part, 1, 1, "Hell"}
 , {aedis::resp3::type::streamed_string_part, 1, 1, "o wor"}
@@ -122,39 +130,68 @@ std::vector<node_type> streamed_string_e1
 
 std::vector<node_type> streamed_string_e2 { {resp3::type::streamed_string_part, 1UL, 1UL, {}} };
 
+#define S01 "#11\r\n"
+#define S02 "#f\r\n"
+#define S03 "#t\r\n"
+#define S04 "$?\r\n;0\r\n"
+#define S05 "%11\r\n"
+#define S06 "$?\r\n;4\r\nHell\r\n;5\r\no wor\r\n;1\r\nd\r\n;0\r\n"
+#define S07 "$?\r\n;b\r\nHell\r\n;5\r\no wor\r\n;1\r\nd\r\n;0\r\n"
+#define S08 "*1\r\n:11\r\n"
+#define S09 ":-3\r\n"
+#define S10 ":11\r\n"
+#define S11 ":3\r\n"
+#define S12 "_\r\n"
+#define S13 ">4\r\n+pubsub\r\n+message\r\n+some-channel\r\n+some message\r\n"
+#define S14 ">0\r\n"
+#define S15 "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n"
+#define S16 "%4\r\n$4\r\nkey1\r\n$6\r\nvalue1\r\n$4\r\nkey2\r\n$6\r\nvalue2\r\n$4\r\nkey3\r\n$6\r\nvalue3\r\n$4\r\nkey3\r\n$6\r\nvalue3\r\n"
+#define S17 "*1\r\n" S16
+#define S18 "|1\r\n+key-popularity\r\n%2\r\n$1\r\na\r\n,0.1923\r\n$1\r\nb\r\n,0.0012\r\n"
+#define S19 "|0\r\n"
+#define S20 "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n"
+#define S21 "*1\r\n*1\r\n$2\r\nab\r\n"
+#define S22 "*1\r\n*1\r\n*1\r\n*1\r\n*1\r\n*1\r\na\r\n"
+#define S23 "*0\r\n"
+#define S24 "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n"
+#define S25 "~6\r\n+orange\r\n+apple\r\n+one\r\n+two\r\n+three\r\n+orange\r\n"
+#define S26 "*1\r\n" S25
+#define S27 "~0\r\n"
+#define S28 "-Error\r\n"
+#define S29 "-\r\n"
 
 #define NUMBER_TEST_CONDITIONS(test) \
-   test(ex, make_expected("#11\r\n",       std::optional<bool>{}, "bool.error", aedis::error::unexpected_bool_value)); \
-   test(ex, make_expected("#f\r\n",        bool{false},             "bool.bool (true)")); \
-   test(ex, make_expected("#f\r\n",        node_type{resp3::type::boolean, 1UL, 0UL, {"f"}}, "bool.node (false)")); \
-   test(ex, make_expected("#t\r\n",        bool{true}, "bool.bool (true)")); \
-   test(ex, make_expected("#t\r\n",        node_type{resp3::type::boolean, 1UL, 0UL, {"t"}}, "bool.node (true)")); \
-   test(ex, make_expected("#t\r\n",        op_bool_ok, "optional.int")); \
-   test(ex, make_expected("#t\r\n",        std::map<int, int>{}, "bool.error", aedis::error::expects_resp3_map)); \
-   test(ex, make_expected("#t\r\n",        std::set<int>{}, "bool.error", aedis::error::expects_resp3_set)); \
-   test(ex, make_expected("#t\r\n",        std::unordered_map<int, int>{}, "bool.error", aedis::error::expects_resp3_map)); \
-   test(ex, make_expected("#t\r\n",        std::unordered_set<int>{}, "bool.error", aedis::error::expects_resp3_set)); \
-   test(ex, make_expected("$?\r\n;0\r\n",  streamed_string_e2, "streamed_string.node.empty")); \
-   test(ex, make_expected("%11\r\n",       std::optional<int>{}, "number.optional.int.error", aedis::error::expects_resp3_simple_type));; \
-   test(ex, make_expected("*1\r\n:11\r\n", std::tuple<int>{11}, "number.tuple.int")); \
-   test(ex, make_expected(":-3\r\n",       node_type{resp3::type::number, 1UL, 0UL, {"-3"}}, "number.node (negative)")); \
-   test(ex, make_expected(":11\r\n",       int{11}, "number.int")); \
-   test(ex, make_expected(":11\r\n",       op_int_ok, "number.optional.int")); \
-   test(ex, make_expected(":11\r\n",       std::list<std::string>{}, "number.optional.int", aedis::error::expects_resp3_aggregate)); \
-   test(ex, make_expected(":11\r\n",       std::map<std::string, std::string>{}, "number.optional.int", aedis::error::expects_resp3_map)); \
-   test(ex, make_expected(":11\r\n",       std::set<std::string>{}, "number.optional.int", aedis::error::expects_resp3_set)); \
-   test(ex, make_expected(":11\r\n",       std::unordered_map<std::string, std::string>{}, "number.optional.int", aedis::error::expects_resp3_map)); \
-   test(ex, make_expected(":11\r\n",       std::unordered_set<std::string>{}, "number.optional.int", aedis::error::expects_resp3_set)); \
-   test(ex, make_expected(":3\r\n",        node_type{resp3::type::number, 1UL, 0UL, {"3"}}, "number.node (positive)")); \
-   test(ex, make_expected("_\r\n",         int{0}, "number.int.error.null", aedis::error::resp3_null)); \
-   test(ex, make_expected(streamed_string_wire, std::string{"Hello word"}, "streamed_string.string")); \
-   test(ex, make_expected(streamed_string_wire, int{}, "streamed_string.string", aedis::error::not_a_number)); \
-   test(ex, make_expected(streamed_string_wire, streamed_string_e1, "streamed_string.node")); \
+   test(ex, make_expected(S01, std::optional<bool>{}, "bool.error", aedis::error::unexpected_bool_value)); \
+   test(ex, make_expected(S02, bool{false}, "bool.bool (true)")); \
+   test(ex, make_expected(S02, node_type{resp3::type::boolean, 1UL, 0UL, {"f"}}, "bool.node (false)")); \
+   test(ex, make_expected(S03, bool{true}, "bool.bool (true)")); \
+   test(ex, make_expected(S03, node_type{resp3::type::boolean, 1UL, 0UL, {"t"}}, "bool.node (true)")); \
+   test(ex, make_expected(S03, op_bool_ok, "optional.int")); \
+   test(ex, make_expected(S03, std::map<int, int>{}, "bool.error", aedis::error::expects_resp3_map)); \
+   test(ex, make_expected(S03, std::set<int>{}, "bool.error", aedis::error::expects_resp3_set)); \
+   test(ex, make_expected(S03, std::unordered_map<int, int>{}, "bool.error", aedis::error::expects_resp3_map)); \
+   test(ex, make_expected(S03, std::unordered_set<int>{}, "bool.error", aedis::error::expects_resp3_set)); \
+   test(ex, make_expected(S04, streamed_string_e2, "streamed_string.node.empty")); \
+   test(ex, make_expected(S05, std::optional<int>{}, "number.optional.int.error", aedis::error::expects_resp3_simple_type));; \
+   test(ex, make_expected(S06, int{}, "streamed_string.string", aedis::error::not_a_number)); \
+   test(ex, make_expected(S06, std::string{"Hello word"}, "streamed_string.string")); \
+   test(ex, make_expected(S06, streamed_string_e1, "streamed_string.node")); \
+   test(ex, make_expected(S07, std::string{}, "streamed_string.error", aedis::error::not_a_number)); \
+   test(ex, make_expected(S08, std::tuple<int>{11}, "number.tuple.int")); \
+   test(ex, make_expected(S09, node_type{resp3::type::number, 1UL, 0UL, {"-3"}}, "number.node (negative)")); \
+   test(ex, make_expected(S10, int{11}, "number.int")); \
+   test(ex, make_expected(S10, op_int_ok, "number.optional.int")); \
+   test(ex, make_expected(S10, std::list<std::string>{}, "number.optional.int", aedis::error::expects_resp3_aggregate)); \
+   test(ex, make_expected(S10, std::map<std::string, std::string>{}, "number.optional.int", aedis::error::expects_resp3_map)); \
+   test(ex, make_expected(S10, std::set<std::string>{}, "number.optional.int", aedis::error::expects_resp3_set)); \
+   test(ex, make_expected(S10, std::unordered_map<std::string, std::string>{}, "number.optional.int", aedis::error::expects_resp3_map)); \
+   test(ex, make_expected(S10, std::unordered_set<std::string>{}, "number.optional.int", aedis::error::expects_resp3_set)); \
+   test(ex, make_expected(S11, node_type{resp3::type::number, 1UL, 0UL, {"3"}}, "number.node (positive)")); \
+   test(ex, make_expected(S12, int{0}, "number.int.error.null", aedis::error::resp3_null)); \
 
 BOOST_AUTO_TEST_CASE(test_push)
 {
    net::io_context ioc;
-   std::string const wire = ">4\r\n+pubsub\r\n+message\r\n+some-channel\r\n+some message\r\n";
 
    std::vector<node_type> e1a
       { {resp3::type::push,          4UL, 0UL, {}}
@@ -166,8 +203,8 @@ BOOST_AUTO_TEST_CASE(test_push)
 
    std::vector<node_type> e1b { {resp3::type::push, 0UL, 0UL, {}} };
 
-   auto const in01 = expect<std::vector<node_type>>{wire, e1a, "push.node"};
-   auto const in02 = expect<std::vector<node_type>>{">0\r\n", e1b, "push.node.empty"};
+   auto const in01 = expect<std::vector<node_type>>{S13, e1a, "push.node"};
+   auto const in02 = expect<std::vector<node_type>>{S14, e1b, "push.node.empty"};
 
    auto ex = ioc.get_executor();
 
@@ -191,9 +228,6 @@ BOOST_AUTO_TEST_CASE(test_map)
    using op_vec_type = std::optional<std::vector<std::string>>;
    using tuple_type = std::tuple<std::string, std::string, std::string, std::string, std::string, std::string, std::string, std::string>;
 
-   std::string const wire2 = "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n";
-   std::string const wire = "%4\r\n$4\r\nkey1\r\n$6\r\nvalue1\r\n$4\r\nkey2\r\n$6\r\nvalue2\r\n$4\r\nkey3\r\n$6\r\nvalue3\r\n$4\r\nkey3\r\n$6\r\nvalue3\r\n";
-
    std::vector<node_type> expected_1a
    { {resp3::type::map,         4UL, 0UL, {}}
    , {resp3::type::blob_string, 1UL, 1UL, {"key1"}}
@@ -252,20 +286,20 @@ BOOST_AUTO_TEST_CASE(test_map)
    , std::string{"key3"}, std::string{"value3"}
    };
 
-   auto const in00 = expect<std::vector<node_type>>{wire, expected_1a, "map.node"};
+   auto const in00 = expect<std::vector<node_type>>{S16, expected_1a, "map.node"};
    auto const in01 = expect<map_type>{"%0\r\n", map_type{}, "map.map.empty"};
-   auto const in02 = expect<map_type>{wire, expected_1b, "map.map"};
-   auto const in03 = expect<mmap_type>{wire, e1k, "map.multimap"};
-   auto const in04 = expect<umap_type>{wire, e1g, "map.unordered_map"};
-   auto const in05 = expect<mumap_type>{wire, e1l, "map.unordered_multimap"};
-   auto const in06 = expect<vec_type>{wire, expected_1c, "map.vector"};
-   auto const in07 = expect<op_map_type>{wire, expected_1d, "map.optional.map"};
-   auto const in08 = expect<op_vec_type>{wire, expected_1e, "map.optional.vector"};
-   auto const in09 = expect<std::tuple<op_map_type>>{"*1\r\n" + wire, std::tuple<op_map_type>{expected_1d}, "map.transaction.optional.map"};
+   auto const in02 = expect<map_type>{S16, expected_1b, "map.map"};
+   auto const in03 = expect<mmap_type>{S16, e1k, "map.multimap"};
+   auto const in04 = expect<umap_type>{S16, e1g, "map.unordered_map"};
+   auto const in05 = expect<mumap_type>{S16, e1l, "map.unordered_multimap"};
+   auto const in06 = expect<vec_type>{S16, expected_1c, "map.vector"};
+   auto const in07 = expect<op_map_type>{S16, expected_1d, "map.optional.map"};
+   auto const in08 = expect<op_vec_type>{S16, expected_1e, "map.optional.vector"};
+   auto const in09 = expect<std::tuple<op_map_type>>{S17, std::tuple<op_map_type>{expected_1d}, "map.transaction.optional.map"};
    auto const in10 = expect<int>{"%11\r\n", int{}, "map.invalid.int", aedis::error::expects_resp3_simple_type};
-   auto const in11 = expect<tuple_type>{wire, e1f, "map.tuple"};
-   auto const in12 = expect<map_type>{wire2, map_type{}, "map.error", aedis::error::expects_resp3_map};
-   auto const in13 = expect<map_type>{"_\r\n", map_type{}, "map.null", aedis::error::resp3_null};
+   auto const in11 = expect<tuple_type>{S16, e1f, "map.tuple"};
+   auto const in12 = expect<map_type>{S15, map_type{}, "map.error", aedis::error::expects_resp3_map};
+   auto const in13 = expect<map_type>{S12, map_type{}, "map.null", aedis::error::resp3_null};
 
    auto ex = ioc.get_executor();
 
@@ -303,8 +337,6 @@ BOOST_AUTO_TEST_CASE(test_map)
 
 void test_attribute(net::io_context& ioc)
 {
-   char const* wire = "|1\r\n+key-popularity\r\n%2\r\n$1\r\na\r\n,0.1923\r\n$1\r\nb\r\n,0.0012\r\n";
-
    std::vector<node_type> e1a
       { {resp3::type::attribute,     1UL, 0UL, {}}
       , {resp3::type::simple_string, 1UL, 1UL, "key-popularity"}
@@ -317,8 +349,8 @@ void test_attribute(net::io_context& ioc)
 
    std::vector<node_type> e1b;
 
-   auto const in01 = expect<std::vector<node_type>>{wire, e1a, "attribute.node"};
-   auto const in02 = expect<std::vector<node_type>>{"|0\r\n", e1b, "attribute.node.empty"};
+   auto const in01 = expect<std::vector<node_type>>{S18, e1a, "attribute.node"};
+   auto const in02 = expect<std::vector<node_type>>{S19, e1b, "attribute.node.empty"};
 
    auto ex = ioc.get_executor();
 
@@ -336,9 +368,6 @@ BOOST_AUTO_TEST_CASE(test_array)
    using array_type2 = std::array<int, 1>;
 
    net::io_context ioc;
-   char const* wire = "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n";
-   char const* wire_nested = "*1\r\n*1\r\n$2\r\nab\r\n";
-   char const* wire_nested2 = "*1\r\n*1\r\n*1\r\n*1\r\n*1\r\n*1\r\na\r\n";
 
    std::vector<node_type> e1a
       { {resp3::type::array,       3UL, 0UL, {}}
@@ -355,22 +384,22 @@ BOOST_AUTO_TEST_CASE(test_array)
    std::list<int> const e1g{11, 22, 3};
    std::deque<int> const e1h{11, 22, 3};
 
-   auto const in01 = expect<std::vector<node_type>>{wire, e1a, "array.node"};
-   auto const in02 = expect<std::vector<int>>{wire, e1b, "array.int"};
-   auto const in03 = expect<std::vector<node_type>>{"*0\r\n", e1e, "array.node.empty"};
-   auto const in04 = expect<std::vector<std::string>>{"*0\r\n", e1d, "array.string.empty"};
-   auto const in05 = expect<std::vector<std::string>>{wire, e1c, "array.string"};
-   auto const in06 = expect<array_type>{wire, e1f, "array.array"};
-   auto const in07 = expect<std::list<int>>{wire, e1g, "array.list"};
-   auto const in08 = expect<std::deque<int>>{wire, e1h, "array.deque"};
-   auto const in09 = expect<std::vector<int>>{"_\r\n", std::vector<int>{}, "array.vector", aedis::error::resp3_null};
-   auto const in10 = expect<std::list<int>>{"_\r\n", std::list<int>{}, "array.list", aedis::error::resp3_null};
-   auto const in11 = expect<array_type>{"_\r\n", array_type{}, "array.null", aedis::error::resp3_null};
-   auto const in12 = expect<tuple_type>{wire, tuple_type{}, "array.list", aedis::error::incompatible_size};
-   auto const in13 = expect<array_type2>{wire_nested, array_type2{}, "array.nested", aedis::error::nested_aggregate_not_supported};
-   auto const in14 = expect<array_type2>{wire, array_type2{}, "array.null", aedis::error::incompatible_size};
-   auto const in15 = expect<array_type2>{":3\r\n", array_type2{}, "array.array", aedis::error::expects_resp3_aggregate};
-   auto const in16 = expect<vec_node_type>{wire_nested2, vec_node_type{}, "array.depth.exceeds", aedis::error::exceeeds_max_nested_depth};
+   auto const in01 = expect<std::vector<node_type>>{S20, e1a, "array.node"};
+   auto const in02 = expect<std::vector<int>>{S20, e1b, "array.int"};
+   auto const in03 = expect<std::vector<node_type>>{S23, e1e, "array.node.empty"};
+   auto const in04 = expect<std::vector<std::string>>{S23, e1d, "array.string.empty"};
+   auto const in05 = expect<std::vector<std::string>>{S20, e1c, "array.string"};
+   auto const in06 = expect<array_type>{S20, e1f, "array.array"};
+   auto const in07 = expect<std::list<int>>{S20, e1g, "array.list"};
+   auto const in08 = expect<std::deque<int>>{S20, e1h, "array.deque"};
+   auto const in09 = expect<std::vector<int>>{S12, std::vector<int>{}, "array.vector", aedis::error::resp3_null};
+   auto const in10 = expect<std::list<int>>{S12, std::list<int>{}, "array.list", aedis::error::resp3_null};
+   auto const in11 = expect<array_type>{S12, array_type{}, "array.null", aedis::error::resp3_null};
+   auto const in12 = expect<tuple_type>{S20, tuple_type{}, "array.list", aedis::error::incompatible_size};
+   auto const in13 = expect<array_type2>{S21, array_type2{}, "array.nested", aedis::error::nested_aggregate_not_supported};
+   auto const in14 = expect<array_type2>{S20, array_type2{}, "array.null", aedis::error::incompatible_size};
+   auto const in15 = expect<array_type2>{S11, array_type2{}, "array.array", aedis::error::expects_resp3_aggregate};
+   auto const in16 = expect<vec_node_type>{S22, vec_node_type{}, "array.depth.exceeds", aedis::error::exceeeds_max_nested_depth};
 
    auto ex = ioc.get_executor();
 
@@ -421,9 +450,6 @@ BOOST_AUTO_TEST_CASE(test_set)
    using vec_type = std::vector<std::string>;
    using op_vec_type = std::optional<std::vector<std::string>>;
 
-   std::string const wire2 = "*3\r\n$2\r\n11\r\n$2\r\n22\r\n$1\r\n3\r\n";
-   std::string const wire = "~6\r\n+orange\r\n+apple\r\n+one\r\n+two\r\n+three\r\n+orange\r\n";
-
    std::vector<node_type> const expected1a
    { {resp3::type::set,            6UL, 0UL, {}}
    , {resp3::type::simple_string,  1UL, 1UL, {"orange"}}
@@ -441,16 +467,16 @@ BOOST_AUTO_TEST_CASE(test_set)
    op_vec_type expected_1e;
    expected_1e = e1d;
 
-   auto const in00 = expect<std::vector<node_type>>{wire, expected1a, "set.node"};
-   auto const in01 = expect<std::vector<node_type>>{"~0\r\n", std::vector<node_type>{ {resp3::type::set,  0UL, 0UL, {}} }, "set.node (empty)"};
-   auto const in02 = expect<set_type>{wire, set_type{"apple", "one", "orange", "three", "two"}, "set.set"};
-   auto const in03 = expect<mset_type>{wire, e1f, "set.multiset"};
-   auto const in04 = expect<vec_type>{wire, e1d, "set.vector "};
-   auto const in05 = expect<op_vec_type>{wire, expected_1e, "set.vector "};
-   auto const in06 = expect<uset_type>{wire, e1c, "set.unordered_set"};
-   auto const in07 = expect<muset_type>{wire, e1g, "set.unordered_multiset"};
-   auto const in08 = expect<std::tuple<uset_type>>{"*1\r\n" + wire, std::tuple<uset_type>{e1c}, "set.tuple"};
-   auto const in09 = expect<set_type>{wire2, set_type{}, "set.error", aedis::error::expects_resp3_set};
+   auto const in00 = expect<std::vector<node_type>>{S25, expected1a, "set.node"};
+   auto const in01 = expect<std::vector<node_type>>{S27, std::vector<node_type>{ {resp3::type::set,  0UL, 0UL, {}} }, "set.node (empty)"};
+   auto const in02 = expect<set_type>{S25, set_type{"apple", "one", "orange", "three", "two"}, "set.set"};
+   auto const in03 = expect<mset_type>{S25, e1f, "set.multiset"};
+   auto const in04 = expect<vec_type>{S25, e1d, "set.vector "};
+   auto const in05 = expect<op_vec_type>{S25, expected_1e, "set.vector "};
+   auto const in06 = expect<uset_type>{S25, e1c, "set.unordered_set"};
+   auto const in07 = expect<muset_type>{S25, e1g, "set.unordered_multiset"};
+   auto const in08 = expect<std::tuple<uset_type>>{S26, std::tuple<uset_type>{e1c}, "set.tuple"};
+   auto const in09 = expect<set_type>{S24, set_type{}, "set.error", aedis::error::expects_resp3_set};
 
    auto ex = ioc.get_executor();
 
@@ -481,16 +507,19 @@ BOOST_AUTO_TEST_CASE(test_set)
 BOOST_AUTO_TEST_CASE(test_simple_error)
 {
    net::io_context ioc;
-   auto const in01 = expect<node_type>{"-Error\r\n", node_type{resp3::type::simple_error, 1UL, 0UL, {"Error"}}, "simple_error.node", aedis::error::resp3_simple_error};
-   auto const in02 = expect<node_type>{"-\r\n", node_type{resp3::type::simple_error, 1UL, 0UL, {""}}, "simple_error.node.empty", aedis::error::resp3_simple_error};
+   auto const in01 = expect<node_type>{S28, node_type{resp3::type::simple_error, 1UL, 0UL, {"Error"}}, "simple_error.node", aedis::error::resp3_simple_error};
+   auto const in02 = expect<node_type>{S29, node_type{resp3::type::simple_error, 1UL, 0UL, {""}}, "simple_error.node.empty", aedis::error::resp3_simple_error};
+   auto const in03 = expect<aedis::ignore>{S28, aedis::ignore{}, "simple_error.not.ignore.error", aedis::error::resp3_simple_error};
 
    auto ex = ioc.get_executor();
 
    test_sync(ex, in01);
    test_sync(ex, in02);
+   test_sync(ex, in03);
 
    test_async(ex, in01);
    test_async(ex, in02);
+   test_async(ex, in03);
    ioc.run();
 }
 
@@ -557,14 +586,17 @@ BOOST_AUTO_TEST_CASE(test_blob_error)
    net::io_context ioc;
    auto const in01 = expect<node_type>{"!21\r\nSYNTAX invalid syntax\r\n", node_type{resp3::type::blob_error, 1UL, 0UL, {"SYNTAX invalid syntax"}}, "blob_error", aedis::error::resp3_blob_error};
    auto const in02 = expect<node_type>{"!0\r\n\r\n", node_type{resp3::type::blob_error, 1UL, 0UL, {}}, "blob_error.empty", aedis::error::resp3_blob_error};
+   auto const in03 = expect<aedis::ignore>{"!3\r\nfoo\r\n", aedis::ignore{}, "blob_error.ignore.adapter.error", aedis::error::resp3_blob_error};
 
    auto ex = ioc.get_executor();
 
    test_sync(ex, in01);
    test_sync(ex, in02);
+   test_sync(ex, in03);
 
    test_async(ex, in01);
    test_async(ex, in02);
+   test_async(ex, in03);
    ioc.run();
 }
 
@@ -679,15 +711,15 @@ BOOST_AUTO_TEST_CASE(test_null)
    using op_type_08 = std::optional<std::set<std::string>>;
    using op_type_09 = std::optional<std::unordered_set<std::string>>;
 
-   auto const in01 = expect<op_type_01>{"_\r\n", op_type_01{}, "null.optional.bool"};
-   auto const in02 = expect<op_type_02>{"_\r\n", op_type_02{}, "null.optional.int"};
-   auto const in03 = expect<op_type_03>{"_\r\n", op_type_03{}, "null.optional.string"};
-   auto const in04 = expect<op_type_04>{"_\r\n", op_type_04{}, "null.optional.vector"};
-   auto const in05 = expect<op_type_05>{"_\r\n", op_type_05{}, "null.optional.list"};
-   auto const in06 = expect<op_type_06>{"_\r\n", op_type_06{}, "null.optional.map"};
-   auto const in07 = expect<op_type_07>{"_\r\n", op_type_07{}, "null.optional.unordered_map"};
-   auto const in08 = expect<op_type_08>{"_\r\n", op_type_08{}, "null.optional.set"};
-   auto const in09 = expect<op_type_09>{"_\r\n", op_type_09{}, "null.optional.unordered_set"};
+   auto const in01 = expect<op_type_01>{S12, op_type_01{}, "null.optional.bool"};
+   auto const in02 = expect<op_type_02>{S12, op_type_02{}, "null.optional.int"};
+   auto const in03 = expect<op_type_03>{S12, op_type_03{}, "null.optional.string"};
+   auto const in04 = expect<op_type_04>{S12, op_type_04{}, "null.optional.vector"};
+   auto const in05 = expect<op_type_05>{S12, op_type_05{}, "null.optional.list"};
+   auto const in06 = expect<op_type_06>{S12, op_type_06{}, "null.optional.map"};
+   auto const in07 = expect<op_type_07>{S12, op_type_07{}, "null.optional.unordered_map"};
+   auto const in08 = expect<op_type_08>{S12, op_type_08{}, "null.optional.set"};
+   auto const in09 = expect<op_type_09>{S12, op_type_09{}, "null.optional.unordered_set"};
 
    auto ex = ioc.get_executor();
 
@@ -713,6 +745,45 @@ BOOST_AUTO_TEST_CASE(test_null)
    ioc.run();
 }
 
+BOOST_AUTO_TEST_CASE(ignore_adapter_simple_error)
+{
+   net::io_context ioc;
+   std::string rbuffer;
+
+   boost::system::error_code ec;
+
+   test_stream ts {ioc};
+   ts.append("-Error\r\n");
+   resp3::read(ts, net::dynamic_buffer(rbuffer), adapt2(), ec);
+   BOOST_CHECK_EQUAL(ec, aedis::error::resp3_simple_error);
+   BOOST_TEST(!rbuffer.empty());
+}
+
+BOOST_AUTO_TEST_CASE(ignore_adapter_blob_error)
+{
+   net::io_context ioc;
+   std::string rbuffer;
+   boost::system::error_code ec;
+
+   test_stream ts {ioc};
+   ts.append("!21\r\nSYNTAX invalid syntax\r\n");
+   resp3::read(ts, net::dynamic_buffer(rbuffer), adapt2(), ec);
+   BOOST_CHECK_EQUAL(ec, aedis::error::resp3_blob_error);
+   BOOST_TEST(!rbuffer.empty());
+}
+
+BOOST_AUTO_TEST_CASE(ignore_adapter_no_error)
+{
+   net::io_context ioc;
+   std::string rbuffer;
+   boost::system::error_code ec;
+   test_stream ts {ioc};
+   ts.append(":10\r\n");
+   resp3::read(ts, net::dynamic_buffer(rbuffer), adapt2(), ec);
+   BOOST_TEST(!ec);
+   BOOST_TEST(rbuffer.empty());
+}
+
 BOOST_AUTO_TEST_CASE(all_tests)
 {
    net::io_context ioc;
@@ -747,11 +818,6 @@ void check_error(char const* name, aedis::error ev)
 
 BOOST_AUTO_TEST_CASE(error)
 {
-   check_error("aedis", aedis::error::resolve_timeout);
-   check_error("aedis", aedis::error::resolve_timeout);
-   check_error("aedis", aedis::error::connect_timeout);
-   check_error("aedis", aedis::error::idle_timeout);
-   check_error("aedis", aedis::error::exec_timeout);
    check_error("aedis", aedis::error::invalid_data_type);
    check_error("aedis", aedis::error::not_a_number);
    check_error("aedis", aedis::error::exceeeds_max_nested_depth);
@@ -767,7 +833,7 @@ BOOST_AUTO_TEST_CASE(error)
    check_error("aedis", aedis::error::incompatible_size);
    check_error("aedis", aedis::error::not_a_double);
    check_error("aedis", aedis::error::resp3_null);
-   check_error("aedis", aedis::error::unexpected_server_role);
+   check_error("aedis", aedis::error::not_connected);
 }
 
 std::string get_type_as_str(aedis::resp3::type t)
@@ -824,3 +890,13 @@ BOOST_AUTO_TEST_CASE(type_convert)
 #undef CHECK_CASE
 }
 
+BOOST_AUTO_TEST_CASE(adapter)
+{
+   using aedis::adapt;
+
+   std::string s;
+   auto resp = std::tie(s, std::ignore);
+   auto f = adapt(resp);
+   (void)f;
+}
+

tests/request.cpp

@@ -0,0 +1,57 @@
+/* Copyright (c) 2018-2022 Marcelo Zimbres Silva (mzimbres@gmail.com)
+ *
+ * Distributed under the Boost Software License, Version 1.0. (See
+ * accompanying file LICENSE.txt)
+ */
+
+#include <iostream>
+#include <memory_resource>
+
+#define BOOST_TEST_MODULE low level
+#include <boost/test/included/unit_test.hpp>
+
+#include <aedis.hpp>
+#include <aedis/src.hpp>
+
+using aedis::resp3::request;
+
+// TODO: Serialization.
+
+BOOST_AUTO_TEST_CASE(single_arg_allocator)
+{
+   char buf[4096];
+   std::pmr::monotonic_buffer_resource resource{buf, 4096};
+   request req1{{}, &resource};
+   req1.push("PING");
+   BOOST_CHECK_EQUAL(req1.payload(), std::pmr::string{"*1\r\n$4\r\nPING\r\n"});
+}
+
+BOOST_AUTO_TEST_CASE(arg_int)
+{
+   request req;
+   req.push("PING", 42);
+   BOOST_CHECK_EQUAL(req.payload(), std::pmr::string{"*2\r\n$4\r\nPING\r\n$2\r\n42\r\n"});
+}
+
+BOOST_AUTO_TEST_CASE(multiple_args)
+{
+   char const* res = "*5\r\n$3\r\nSET\r\n$3\r\nkey\r\n$5\r\nvalue\r\n$2\r\nEX\r\n$1\r\n2\r\n";
+   request req;
+   req.push("SET", "key", "value", "EX", "2");
+   BOOST_CHECK_EQUAL(req.payload(), std::pmr::string{res});
+}
+
+BOOST_AUTO_TEST_CASE(container_and_range)
+{
+   std::map<std::string, std::string> in{{"key1", "value1"}, {"key2", "value2"}};
+
+   char const* res = "*6\r\n$4\r\nHSET\r\n$3\r\nkey\r\n$4\r\nkey1\r\n$6\r\nvalue1\r\n$4\r\nkey2\r\n$6\r\nvalue2\r\n";
+
+   request req1;
+   req1.push_range("HSET", "key", in);
+   BOOST_CHECK_EQUAL(req1.payload(), std::pmr::string{res});
+
+   request req2;
+   req2.push_range("HSET", "key", std::cbegin(in), std::cend(in));
+   BOOST_CHECK_EQUAL(req2.payload(), std::pmr::string{res});
+}