99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
#pragma once
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#ifndef ASYNC_WRITER_H_HQIRH28I
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#define ASYNC_WRITER_H_HQIRH28I
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#include "asio.hpp"
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#include "rpc/msgpack.hpp"
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#include <condition_variable>
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#include <deque>
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#include <memory>
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#include <thread>
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namespace rpc {
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class client;
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namespace detail {
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//! \brief Common logic for classes that have a write queue with async writing.
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class async_writer : public std::enable_shared_from_this<async_writer> {
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public:
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async_writer(RPCLIB_ASIO::io_service *io,
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RPCLIB_ASIO::ip::tcp::socket socket)
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: socket_(std::move(socket)), write_strand_(*io), exit_(false) {}
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void do_write() {
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if (exit_) {
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return;
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}
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auto self(shared_from_this());
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auto &item = write_queue_.front();
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// the data in item remains valid until the handler is called
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// since it will still be in the queue physically until then.
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RPCLIB_ASIO::async_write(
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socket_, RPCLIB_ASIO::buffer(item.data(), item.size()),
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write_strand_.wrap(
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[this, self](std::error_code ec, std::size_t transferred) {
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(void)transferred;
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if (!ec) {
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write_queue_.pop_front();
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if (write_queue_.size() > 0) {
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if (!exit_) {
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do_write();
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}
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}
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} else {
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LOG_ERROR("Error while writing to socket: {}", ec);
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}
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if (exit_) {
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LOG_INFO("Closing socket");
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std::error_code e;
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socket_.shutdown(
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RPCLIB_ASIO::ip::tcp::socket::shutdown_both,
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e);
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if (e) {
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LOG_WARN("std::system_error during socket shutdown. "
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"Code: {}. Message: {}", e.value(), e.message());
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}
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socket_.close();
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}
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}));
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}
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void write(RPCLIB_MSGPACK::sbuffer &&data) {
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write_queue_.push_back(std::move(data));
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if (write_queue_.size() > 1) {
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return; // there is an ongoing write chain so don't start another
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}
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do_write();
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}
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friend class rpc::client;
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protected:
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template <typename Derived>
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std::shared_ptr<Derived> shared_from_base() {
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return std::static_pointer_cast<Derived>(shared_from_this());
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}
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protected:
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RPCLIB_ASIO::ip::tcp::socket socket_;
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RPCLIB_ASIO::strand write_strand_;
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std::atomic_bool exit_{false};
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bool exited_ = false;
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std::mutex m_exit_;
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std::condition_variable cv_exit_;
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private:
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std::deque<RPCLIB_MSGPACK::sbuffer> write_queue_;
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RPCLIB_CREATE_LOG_CHANNEL(async_writer)
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};
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} /* detail */
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} /* rpc */
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#endif /* end of include guard: ASYNC_WRITER_H_HQIRH28I */
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