diff options
Diffstat (limited to 'libtransport/src/hicn/transport/core/socket_connector.cc')
-rwxr-xr-x | libtransport/src/hicn/transport/core/socket_connector.cc | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/libtransport/src/hicn/transport/core/socket_connector.cc b/libtransport/src/hicn/transport/core/socket_connector.cc new file mode 100755 index 000000000..332b87ec7 --- /dev/null +++ b/libtransport/src/hicn/transport/core/socket_connector.cc @@ -0,0 +1,237 @@ +/* + * 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. + */ + +#include <hicn/transport/core/socket_connector.h> +#include <hicn/transport/errors/errors.h> +#include <hicn/transport/utils/log.h> +#include <hicn/transport/utils/object_pool.h> + +#include <vector> + +namespace transport { + +namespace core { + +namespace { +class NetworkMessage { + public: + static constexpr std::size_t fixed_header_length = 10; + + static std::size_t decodeHeader(const uint8_t *packet) { + // General checks + // CCNX Control packet format + uint8_t first_byte = packet[0]; + uint8_t ip_format = (packet[0] & 0xf0) >> 4; + + if (TRANSPORT_EXPECT_FALSE(first_byte == 102)) { + // Get packet length + return 44; + } else if (TRANSPORT_EXPECT_TRUE(ip_format == 6 || ip_format == 4)) { + Packet::Format format = Packet::getFormatFromBuffer(packet); + return Packet::getHeaderSizeFromBuffer(format, packet) + + Packet::getPayloadSizeFromBuffer(format, packet); + } + + return 0; + } +}; +} // namespace + +SocketConnector::SocketConnector(PacketReceivedCallback &&receive_callback, + OnReconnect &&on_reconnect_callback, + asio::io_service &io_service, + std::string app_name) + : Connector(), + io_service_(io_service), + socket_(io_service_), + resolver_(io_service_), + timer_(io_service_), + read_msg_(packet_pool_.makePtr(nullptr)), + is_connecting_(false), + is_reconnection_(false), + data_available_(false), + receive_callback_(receive_callback), + on_reconnect_callback_(on_reconnect_callback), + app_name_(app_name) {} + +SocketConnector::~SocketConnector() {} + +void SocketConnector::connect(std::string ip_address, std::string port) { + endpoint_iterator_ = resolver_.resolve( + {ip_address, port, asio::ip::resolver_query_base::numeric_service}); + + startConnectionTimer(); + doConnect(); +} + +void SocketConnector::state() { return; } + +void SocketConnector::send(const uint8_t *packet, std::size_t len, + const PacketSentCallback &packet_sent) { + asio::async_write(socket_, asio::buffer(packet, len), + [packet_sent](std::error_code ec, std::size_t /*length*/) { + packet_sent(); + }); +} + +void SocketConnector::send(const Packet::MemBufPtr &packet) { + io_service_.post([this, packet]() { + bool write_in_progress = !output_buffer_.empty(); + output_buffer_.push_back(std::move(packet)); + if (TRANSPORT_EXPECT_FALSE(!is_connecting_)) { + if (!write_in_progress) { + doWrite(); + } + } else { + // Tell the handle connect it has data to write + data_available_ = true; + } + }); +} + +void SocketConnector::close() { + io_service_.post([this]() { socket_.close(); }); +} + +void SocketConnector::doWrite() { + // TODO improve this piece of code for sending many buffers togethers + // if list contains more than one packet + 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); + + asio::async_write( + socket_, std::move(array), + [this /*, packet*/](std::error_code ec, std::size_t length) { + if (TRANSPORT_EXPECT_TRUE(!ec)) { + output_buffer_.pop_front(); + if (!output_buffer_.empty()) { + doWrite(); + } + } else { + TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str()); + tryReconnect(); + } + }); +} + +void SocketConnector::doReadBody(std::size_t body_length) { + asio::async_read( + socket_, asio::buffer(read_msg_->writableTail(), body_length), + asio::transfer_exactly(body_length), + [this](std::error_code ec, std::size_t length) { + read_msg_->append(length); + if (TRANSPORT_EXPECT_TRUE(!ec)) { + receive_callback_(std::move(read_msg_)); + doReadHeader(); + } else { + TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str()); + tryReconnect(); + } + }); +} + +void SocketConnector::doReadHeader() { + read_msg_ = getPacket(); + asio::async_read( + socket_, + asio::buffer(read_msg_->writableData(), + NetworkMessage::fixed_header_length), + asio::transfer_exactly(NetworkMessage::fixed_header_length), + [this](std::error_code ec, std::size_t length) { + if (TRANSPORT_EXPECT_TRUE(!ec)) { + read_msg_->append(NetworkMessage::fixed_header_length); + std::size_t body_length = 0; + if ((body_length = NetworkMessage::decodeHeader(read_msg_->data())) > + 0) { + doReadBody(body_length - length); + } else { + TRANSPORT_LOGE("Decoding error. Ignoring packet."); + } + } else { + TRANSPORT_LOGE("%d %s", ec.value(), ec.message().c_str()); + tryReconnect(); + } + }); +} + +void SocketConnector::tryReconnect() { + if (!is_connecting_) { + TRANSPORT_LOGE("Connection lost. Trying to reconnect...\n"); + is_connecting_ = true; + is_reconnection_ = true; + io_service_.post([this]() { + socket_.close(); + startConnectionTimer(); + doConnect(); + }); + } +} + +void SocketConnector::doConnect() { + asio::async_connect(socket_, endpoint_iterator_, + [this](std::error_code ec, tcp::resolver::iterator) { + if (!ec) { + timer_.cancel(); + is_connecting_ = false; + asio::ip::tcp::no_delay noDelayOption(true); + socket_.set_option(noDelayOption); + doReadHeader(); + + if (data_available_) { + data_available_ = false; + doWrite(); + } + + if (is_reconnection_) { + is_reconnection_ = false; + TRANSPORT_LOGI("Connection recovered!\n"); + on_reconnect_callback_(); + } + } else { + sleep(1); + doConnect(); + } + }); +} + +bool SocketConnector::checkConnected() { return !is_connecting_; } + +void SocketConnector::enableBurst() { return; } + +void SocketConnector::startConnectionTimer() { + timer_.expires_from_now(std::chrono::seconds(60)); + timer_.async_wait( + std::bind(&SocketConnector::handleDeadline, this, std::placeholders::_1)); +} + +void SocketConnector::handleDeadline(const std::error_code &ec) { + if (!ec) { + io_service_.post([this]() { + socket_.close(); + TRANSPORT_LOGE("Error connecting. Is the forwarder running?\n"); + io_service_.stop(); + }); + } +} + +} // end namespace core + +} // end namespace transport |