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/*
* 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
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