examples => example

example/cpp20_protobuf.cpp

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+/* 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/redis/connection.hpp>
+#include <boost/redis/resp3/serialization.hpp>
+#include <boost/asio/deferred.hpp>
+#include <boost/asio/co_spawn.hpp>
+#include <boost/asio/detached.hpp>
+#include <boost/asio/consign.hpp>
+#include <boost/system/errc.hpp>
+#include <iostream>
+
+// See the definition in person.proto. This header is automatically
+// generated by CMakeLists.txt.
+#include "person.pb.h"
+
+#if defined(BOOST_ASIO_HAS_CO_AWAIT)
+
+namespace asio = boost::asio;
+using boost::redis::request;
+using boost::redis::response;
+using boost::redis::operation;
+using boost::redis::ignore_t;
+using boost::redis::config;
+using boost::redis::connection;
+
+// The protobuf type described in example/person.proto
+using tutorial::person;
+
+// Boost.Redis customization points (example/protobuf.hpp)
+namespace tutorial
+{
+
+// Below I am using a Boost.Redis to indicate a protobuf error, this
+// is ok for an example, users however might want to define their own
+// error codes.
+void boost_redis_to_bulk(std::string& to, person const& u)
+{
+   std::string tmp;
+   if (!u.SerializeToString(&tmp))
+      throw boost::system::system_error(boost::redis::error::invalid_data_type);
+
+   boost::redis::resp3::boost_redis_to_bulk(to, tmp);
+}
+
+void boost_redis_from_bulk(person& u, std::string_view sv, boost::system::error_code& ec)
+{
+   std::string const tmp {sv};
+   if (!u.ParseFromString(tmp))
+      ec = boost::redis::error::invalid_data_type;
+}
+
+} // tutorial
+
+using tutorial::boost_redis_to_bulk;
+using tutorial::boost_redis_from_bulk;
+
+asio::awaitable<void> co_main(config cfg)
+{
+   auto ex = co_await asio::this_coro::executor;
+   auto conn = std::make_shared<connection>(ex);
+   conn->async_run(cfg, {}, asio::consign(asio::detached, conn));
+
+   person p;
+   p.set_name("Louis");
+   p.set_id(3);
+   p.set_email("No email yet.");
+
+   request req;
+   req.push("SET", "protobuf-key", p);
+   req.push("GET", "protobuf-key");
+
+   response<ignore_t, person> resp;
+
+   // Sends the request and receives the response.
+   co_await conn->async_exec(req, resp, asio::deferred);
+   conn->cancel();
+
+   std::cout
+      << "Name: " << std::get<1>(resp).value().name() << "\n"
+      << "Age: " << std::get<1>(resp).value().id() << "\n"
+      << "Email: " << std::get<1>(resp).value().email() << "\n";
+}
+
+#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)