Simplifies the connect operations.

include/boost/redis/detail/connector.hpp

@@ -12,9 +12,8 @@
 #include <boost/asio/compose.hpp>
 #include <boost/asio/connect.hpp>
 #include <boost/asio/coroutine.hpp>
-#include <boost/asio/experimental/parallel_group.hpp>
 #include <boost/asio/ip/tcp.hpp>
-#include <boost/asio/steady_timer.hpp>
+#include <boost/asio/cancel_after.hpp>
 #include <string>
 #include <chrono>
 
@@ -30,65 +29,29 @@ struct connect_op {
 
    template <class Self>
    void operator()( Self& self
-                  , std::array<std::size_t, 2> const& order = {}
-                  , system::error_code const& ec1 = {}
-                  , asio::ip::tcp::endpoint const& ep= {}
-                  , system::error_code const& ec2 = {})
+                  , system::error_code const& ec = {}
+                  , asio::ip::tcp::endpoint const& ep= {})
    {
       BOOST_ASIO_CORO_REENTER (coro)
       {
-         ctor_->timer_.expires_after(ctor_->timeout_);
-
          BOOST_ASIO_CORO_YIELD
-         asio::experimental::make_parallel_group(
-            [this](auto token)
-            {
-               auto f = [](system::error_code const&, auto const&) { return true; };
-               return asio::async_connect(*stream, *res_, f, token);
-            },
-            [this](auto token) { return ctor_->timer_.async_wait(token);}
-         ).async_wait(
-            asio::experimental::wait_for_one(),
-            std::move(self));
+         asio::async_connect(*stream, *res_,
+            [](system::error_code const&, auto const&) { return true; },
+            asio::cancel_after(ctor_->timeout_, std::move(self)));
 
-         if (is_cancelled(self)) {
-            self.complete(asio::error::operation_aborted);
-            return;
-         }
-
-         switch (order[0]) {
-            case 0: {
          ctor_->endpoint_ = ep;
-               self.complete(ec1);
-            } break;
-            case 1:
-            {
-               if (ec2) {
-                  self.complete(ec2);
-               } else {
-                  self.complete(error::connect_timeout);
-               }
-            } break;
 
-            default: BOOST_ASSERT(false);
+         if (ec == asio::error::operation_aborted) {
+            ec == error::connect_timeout;
          }
+
+         self.complete(ec);
       }
    }
 };
 
-template <class Executor>
 class connector {
 public:
-   using timer_type =
-      asio::basic_waitable_timer<
-         std::chrono::steady_clock,
-         asio::wait_traits<std::chrono::steady_clock>,
-         Executor>;
-
-   connector(Executor ex)
-   : timer_{ex}
-   {}
-
    void set_config(config const& cfg)
       { timeout_ = cfg.connect_timeout; }
 
@@ -102,20 +65,7 @@ public:
       return asio::async_compose
          < CompletionToken
          , void(system::error_code)
-         >(connect_op<connector, Stream>{this, &stream, &res}, token, timer_);
-   }
-
-   std::size_t cancel(operation op)
-   {
-      switch (op) {
-         case operation::connect:
-         case operation::all:
-            timer_.cancel();
-            break;
-         default: /* ignore */;
-      }
-
-      return 0;
+         >(connect_op<connector, Stream>{this, &stream, &res}, token);
    }
 
    auto const& endpoint() const noexcept { return endpoint_;}
@@ -123,7 +73,6 @@ public:
 private:
    template <class, class> friend struct connect_op;
 
-   timer_type timer_;
    std::chrono::steady_clock::duration timeout_ = std::chrono::seconds{2};
    asio::ip::tcp::endpoint endpoint_;
 };

include/boost/redis/detail/resolver.hpp

@@ -40,7 +40,9 @@ struct resolve_op {
 
          resv_->results_ = res;
 
-         // TODO: map operation_canceled into error::resolve_timeout
+         if (ec == asio::error::operation_aborted) {
+            ec == error::resolve_timeout;
+         }
          self.complete(ec);
       }
    }

include/boost/redis/detail/runner.hpp

@@ -18,7 +18,6 @@
 #include <boost/redis/detail/resolver.hpp>
 #include <boost/redis/detail/handshaker.hpp>
 #include <boost/asio/compose.hpp>
-#include <boost/asio/connect.hpp>
 #include <boost/asio/coroutine.hpp>
 #include <boost/asio/experimental/parallel_group.hpp>
 #include <boost/asio/ip/tcp.hpp>
@@ -165,7 +164,6 @@ class runner {
 public:
    runner(Executor ex, config cfg)
    : resv_{ex}
-   , ctor_{ex}
    , hsher_{ex}
    , health_checker_{ex}
    , cfg_{cfg}
@@ -174,7 +172,6 @@ public:
    std::size_t cancel(operation op)
    {
       resv_.cancel(op);
-      ctor_.cancel(op);
       hsher_.cancel(op);
       health_checker_.cancel(op);
       return 0U;
@@ -202,10 +199,8 @@ public:
 
 private:
    using resolver_type = resolver<Executor>;
-   using connector_type = connector<Executor>;
    using handshaker_type = detail::handshaker<Executor>;
    using health_checker_type = health_checker<Executor>;
-   using timer_type = typename connector_type::timer_type;
 
    template <class, class, class> friend class runner_op;
    template <class, class, class> friend struct hello_op;
@@ -245,7 +240,7 @@ private:
    }
 
    resolver_type resv_;
-   connector_type ctor_;
+   connector ctor_;
    handshaker_type hsher_;
    health_checker_type health_checker_;
    request hello_req_;