diff options
Diffstat (limited to 'libtransport/src/io_modules/udp/udp_socket_connector.cc')
| -rw-r--r-- | libtransport/src/io_modules/udp/udp_socket_connector.cc | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/libtransport/src/io_modules/udp/udp_socket_connector.cc b/libtransport/src/io_modules/udp/udp_socket_connector.cc new file mode 100644 index 000000000..456886a54 --- /dev/null +++ b/libtransport/src/io_modules/udp/udp_socket_connector.cc @@ -0,0 +1,211 @@ +/* + * Copyright (c) 2017-2019 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifdef _WIN32 +#include <hicn/transport/portability/win_portability.h> +#endif + +#include <hicn/transport/errors/errors.h> +#include <hicn/transport/utils/log.h> +#include <hicn/transport/utils/object_pool.h> +#include <io_modules/udp/udp_socket_connector.h> + +#include <thread> +#include <vector> + +namespace transport { + +namespace core { + +UdpSocketConnector::UdpSocketConnector( + PacketReceivedCallback &&receive_callback, PacketSentCallback &&packet_sent, + OnCloseCallback &&close_callback, OnReconnectCallback &&on_reconnect, + asio::io_service &io_service, std::string app_name) + : Connector(std::move(receive_callback), std::move(packet_sent), + std::move(close_callback), std::move(on_reconnect)), + io_service_(io_service), + socket_(io_service_), + resolver_(io_service_), + connection_timer_(io_service_), + read_msg_(std::make_pair(nullptr, 0)), + is_reconnection_(false), + data_available_(false), + app_name_(app_name) {} + +UdpSocketConnector::~UdpSocketConnector() {} + +void UdpSocketConnector::connect(std::string ip_address, std::string port) { + endpoint_iterator_ = resolver_.resolve( + {ip_address, port, asio::ip::resolver_query_base::numeric_service}); + + state_ = Connector::State::CONNECTING; + doConnect(); +} + +void UdpSocketConnector::send(const uint8_t *packet, std::size_t len) { + socket_.async_send(asio::buffer(packet, len), + [this](std::error_code ec, std::size_t /*length*/) { + if (sent_callback_) { + sent_callback_(this, ec); + } + }); +} + +void UdpSocketConnector::send(Packet &packet) { + io_service_.post([this, _packet{packet.shared_from_this()}]() { + bool write_in_progress = !output_buffer_.empty(); + output_buffer_.push_back(std::move(_packet)); + if (TRANSPORT_EXPECT_TRUE(state_ == Connector::State::CONNECTED)) { + if (!write_in_progress) { + doWrite(); + } + } else { + // Tell the handle connect it has data to write + data_available_ = true; + } + }); +} + +void UdpSocketConnector::close() { + if (io_service_.stopped()) { + doClose(); + } else { + io_service_.dispatch(std::bind(&UdpSocketConnector::doClose, this)); + } +} + +void UdpSocketConnector::doClose() { + if (state_ != Connector::State::CLOSED) { + state_ = Connector::State::CLOSED; + if (socket_.is_open()) { + socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both); + socket_.close(); + } + } +} + +void UdpSocketConnector::doWrite() { + auto packet = output_buffer_.front().get(); + auto array = std::vector<asio::const_buffer>(); + + const utils::MemBuf *current = packet; + do { + array.push_back(asio::const_buffer(current->data(), current->length())); + current = current->next(); + } while (current != packet); + + socket_.async_send(std::move(array), [this](std::error_code ec, + std::size_t length) { + if (TRANSPORT_EXPECT_TRUE(!ec)) { + output_buffer_.pop_front(); + if (!output_buffer_.empty()) { + doWrite(); + } + } else if (ec.value() == static_cast<int>(std::errc::operation_canceled)) { + // The connection has been closed by the application. + return; + } else { + TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str()); + tryReconnect(); + } + }); +} + +void UdpSocketConnector::doRead() { + read_msg_ = getRawBuffer(); + socket_.async_receive( + asio::buffer(read_msg_.first, read_msg_.second), + [this](std::error_code ec, std::size_t length) { + if (TRANSPORT_EXPECT_TRUE(!ec)) { + auto packet = getPacketFromBuffer(read_msg_.first, length); + receive_callback_(this, *packet, std::make_error_code(std::errc(0))); + doRead(); + } else if (ec.value() == + static_cast<int>(std::errc::operation_canceled)) { + // The connection has been closed by the application. + return; + } else { + TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str()); + tryReconnect(); + } + }); +} + +void UdpSocketConnector::tryReconnect() { + if (state_ == Connector::State::CONNECTED) { + TRANSPORT_LOGE("Connection lost. Trying to reconnect...\n"); + state_ = Connector::State::CONNECTING; + is_reconnection_ = true; + io_service_.post([this]() { + if (socket_.is_open()) { + socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both); + socket_.close(); + } + + doConnect(); + startConnectionTimer(); + std::this_thread::sleep_for(std::chrono::milliseconds(500)); + }); + } +} + +void UdpSocketConnector::doConnect() { + asio::async_connect( + socket_, endpoint_iterator_, + [this](std::error_code ec, udp::resolver::iterator) { + if (!ec) { + connection_timer_.cancel(); + state_ = Connector::State::CONNECTED; + doRead(); + + if (data_available_) { + data_available_ = false; + doWrite(); + } + + if (is_reconnection_) { + is_reconnection_ = false; + } + + on_reconnect_callback_(this); + } else { + doConnect(); + std::this_thread::sleep_for(std::chrono::milliseconds(500)); + } + }); +} + +bool UdpSocketConnector::checkConnected() { + return state_ == Connector::State::CONNECTED; +} + +void UdpSocketConnector::startConnectionTimer() { + connection_timer_.expires_from_now(std::chrono::seconds(60)); + connection_timer_.async_wait(std::bind(&UdpSocketConnector::handleDeadline, + this, std::placeholders::_1)); +} + +void UdpSocketConnector::handleDeadline(const std::error_code &ec) { + if (!ec) { + io_service_.post([this]() { + socket_.close(); + TRANSPORT_LOGE("Error connecting. Is the forwarder running?\n"); + }); + } +} + +} // end namespace core + +} // end namespace transport |