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/*
* Copyright (c) 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 "ATSConnector.h"
#include "HTTP1.xMessageFastParser.h"
#include <hicn/transport/utils/branch_prediction.h>
#include <hicn/transport/utils/log.h>
#include <iostream>
namespace transport {
ATSConnector::ATSConnector(asio::io_service &io_service,
std::string &ip_address, std::string &port,
ContentReceivedCallback receive_callback,
OnReconnect on_reconnect_callback)
: io_service_(io_service),
socket_(io_service_),
resolver_(io_service_),
endpoint_iterator_(resolver_.resolve({ip_address, port})),
timer_(io_service),
is_reconnection_(false),
data_available_(false),
receive_callback_(receive_callback),
on_reconnect_callback_(on_reconnect_callback) {
input_buffer_.prepare(buffer_size + 2048);
state_ = ConnectorState::CONNECTING;
doConnect();
}
ATSConnector::~ATSConnector() {}
void ATSConnector::send(const uint8_t *packet, std::size_t len,
ContentSentCallback &&content_sent) {
asio::async_write(
socket_, asio::buffer(packet, len),
[content_sent = std::move(content_sent)](
std::error_code ec, std::size_t /*length*/) { content_sent(); });
}
void ATSConnector::send(utils::MemBuf *buffer,
ContentSentCallback &&content_sent) {
io_service_.dispatch([this, buffer, callback = std::move(content_sent)]() {
bool write_in_progress = !write_msgs_.empty();
write_msgs_.emplace_back(std::unique_ptr<utils::MemBuf>(buffer),
std::move(callback));
if (TRANSPORT_EXPECT_TRUE(state_ == ConnectorState::CONNECTED)) {
if (!write_in_progress) {
doWrite();
}
} else {
TRANSPORT_LOGD("Tell the handle connect it has data to write");
data_available_ = true;
}
});
}
void ATSConnector::close() {
if (state_ != ConnectorState::CLOSED) {
state_ = ConnectorState::CLOSED;
if (socket_.is_open()) {
socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both);
socket_.close();
// on_disconnect_callback_();
}
}
}
void ATSConnector::doWrite() {
auto &buffer = write_msgs_.front().first;
asio::async_write(socket_, asio::buffer(buffer->data(), buffer->length()),
[this](std::error_code ec, std::size_t length) {
if (TRANSPORT_EXPECT_FALSE(!ec)) {
TRANSPORT_LOGD("Content successfully sent!");
write_msgs_.front().second();
write_msgs_.pop_front();
if (!write_msgs_.empty()) {
doWrite();
}
} else {
TRANSPORT_LOGD("Content NOT sent!");
}
});
} // namespace transport
void ATSConnector::handleRead(std::error_code ec, std::size_t length,
std::size_t size) {
if (TRANSPORT_EXPECT_TRUE(!ec)) {
size -= length;
const uint8_t *buffer =
asio::buffer_cast<const uint8_t *>(input_buffer_.data());
receive_callback_(buffer, input_buffer_.size(), !size, false);
input_buffer_.consume(input_buffer_.size());
if (!size) {
doReadHeader();
} else {
auto to_read = size >= buffer_size ? buffer_size : size;
asio::async_read(
socket_, input_buffer_, asio::transfer_exactly(to_read),
std::bind(&ATSConnector::handleRead, this, std::placeholders::_1,
std::placeholders::_2, size));
}
} else if (ec == asio::error::eof) {
input_buffer_.consume(input_buffer_.size());
tryReconnection();
}
}
void ATSConnector::doReadBody(std::size_t size) {
auto to_read =
size >= buffer_size ? (buffer_size - input_buffer_.size()) : size;
asio::async_read(
socket_, input_buffer_, asio::transfer_exactly(to_read),
std::bind(&ATSConnector::handleRead, this, std::placeholders::_1,
std::placeholders::_2, size));
}
void ATSConnector::doReadHeader() {
asio::async_read_until(
socket_, input_buffer_, "\r\n\r\n",
[this](std::error_code ec, std::size_t length) {
if (TRANSPORT_EXPECT_TRUE(!ec)) {
const uint8_t *buffer =
asio::buffer_cast<const uint8_t *>(input_buffer_.data());
std::size_t size = HTTPMessageFastParser::hasBody(buffer, length);
auto additional_bytes = input_buffer_.size() - length;
auto bytes_to_read =
size >= additional_bytes ? (size - additional_bytes) : size;
receive_callback_(buffer, length, !size, true);
input_buffer_.consume(length);
doReadBody(bytes_to_read);
} else {
input_buffer_.consume(input_buffer_.size());
tryReconnection();
}
});
}
void ATSConnector::tryReconnection() {
TRANSPORT_LOGD("Connection lost. Trying to reconnect...\n");
if (state_ == ConnectorState::CONNECTED) {
state_ = ConnectorState::CONNECTING;
is_reconnection_ = true;
io_service_.post([this]() {
if (socket_.is_open()) {
// socket_.shutdown(asio::ip::tcp::socket::shutdown_type::shutdown_both);
socket_.close();
}
startConnectionTimer();
doConnect();
});
}
}
void ATSConnector::doConnect() {
asio::async_connect(socket_, endpoint_iterator_,
[this](std::error_code ec, tcp::resolver::iterator) {
if (!ec) {
timer_.cancel();
state_ = ConnectorState::CONNECTED;
asio::ip::tcp::no_delay noDelayOption(true);
socket_.set_option(noDelayOption);
// on_reconnect_callback_();
doReadHeader();
if (data_available_ && !write_msgs_.empty()) {
data_available_ = false;
doWrite();
}
if (is_reconnection_) {
is_reconnection_ = false;
TRANSPORT_LOGD("Connection recovered!");
}
} else {
TRANSPORT_LOGE("Impossible to reconnect: %s",
ec.message().c_str());
close();
}
});
}
bool ATSConnector::checkConnected() {
return state_ == ConnectorState::CONNECTED;
}
void ATSConnector::startConnectionTimer() {
timer_.expires_from_now(std::chrono::seconds(10));
timer_.async_wait(
std::bind(&ATSConnector::handleDeadline, this, std::placeholders::_1));
}
void ATSConnector::handleDeadline(const std::error_code &ec) {
if (!ec) {
io_service_.post([this]() {
socket_.close();
TRANSPORT_LOGE("Error connecting. Is the server running?\n");
io_service_.stop();
});
}
}
} // namespace transport
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