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/*
* Copyright (c) 2010-2018 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/Network/BoostConnection.h>
#include <algorithm>
#include <memory>
#include <mutex>
#include <string>
#include <boost/asio/placeholders.hpp>
#include <boost/asio/write.hpp>
#include <boost/bind.hpp>
#include <Swiften/Base/Algorithm.h>
#include <Swiften/Base/ByteArray.h>
#include <Swiften/Base/Log.h>
#include <Swiften/Base/SafeAllocator.h>
#include <Swiften/Base/sleep.h>
#include <Swiften/EventLoop/EventLoop.h>
#include <Swiften/Network/HostAddressPort.h>
namespace Swift {
static const size_t BUFFER_SIZE = 4096;
// -----------------------------------------------------------------------------
// A reference-counted non-modifiable buffer class.
class SharedBuffer {
public:
SharedBuffer(const SafeByteArray& data) :
data_(new std::vector<char, SafeAllocator<char> >(data.begin(), data.end())),
buffer_(boost::asio::buffer(*data_)) {
}
// ConstBufferSequence requirements.
typedef boost::asio::const_buffer value_type;
typedef const boost::asio::const_buffer* const_iterator;
const boost::asio::const_buffer* begin() const { return &buffer_; }
const boost::asio::const_buffer* end() const { return &buffer_ + 1; }
private:
std::shared_ptr< std::vector<char, SafeAllocator<char> > > data_;
boost::asio::const_buffer buffer_;
};
// -----------------------------------------------------------------------------
BoostConnection::BoostConnection(std::shared_ptr<boost::asio::io_service> ioService, EventLoop* eventLoop) :
eventLoop(eventLoop), ioService(ioService), socket_(*ioService), writing_(false), closeSocketAfterNextWrite_(false) {
}
BoostConnection::~BoostConnection() {
}
void BoostConnection::listen() {
doRead();
}
void BoostConnection::connect(const HostAddressPort& addressPort) {
boost::asio::ip::tcp::endpoint endpoint(
boost::asio::ip::address::from_string(addressPort.getAddress().toString()), addressPort.getPort());
socket_.async_connect(
endpoint,
boost::bind(&BoostConnection::handleConnectFinished, shared_from_this(), boost::asio::placeholders::error));
}
void BoostConnection::disconnect() {
//MainEventLoop::removeEventsFromOwner(shared_from_this());
// Mac OS X apparently exhibits a problem where closing a socket during a write could potentially go into uninterruptable sleep.
// See e.g. http://bugs.python.org/issue7401
// We therefore wait until any pending write finishes, which hopefully should fix our hang on exit during close().
std::lock_guard<std::mutex> lock(writeMutex_);
if (writing_) {
closeSocketAfterNextWrite_ = true;
} else {
closeSocket();
}
}
void BoostConnection::closeSocket() {
std::lock_guard<std::mutex> lock(readCloseMutex_);
boost::system::error_code errorCode;
socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_both, errorCode);
socket_.close();
}
void BoostConnection::write(const SafeByteArray& data) {
std::lock_guard<std::mutex> lock(writeMutex_);
if (!writing_) {
writing_ = true;
doWrite(data);
}
else {
append(writeQueue_, data);
}
}
void BoostConnection::doWrite(const SafeByteArray& data) {
boost::asio::async_write(socket_, SharedBuffer(data),
boost::bind(&BoostConnection::handleDataWritten, shared_from_this(), boost::asio::placeholders::error));
}
void BoostConnection::handleConnectFinished(const boost::system::error_code& error) {
SWIFT_LOG(debug) << "Connect finished: " << error << std::endl;
if (!error) {
eventLoop->postEvent(boost::bind(boost::ref(onConnectFinished), false), shared_from_this());
doRead();
}
else if (error != boost::asio::error::operation_aborted) {
eventLoop->postEvent(boost::bind(boost::ref(onConnectFinished), true), shared_from_this());
}
}
void BoostConnection::doRead() {
readBuffer_ = std::make_shared<SafeByteArray>(BUFFER_SIZE);
std::lock_guard<std::mutex> lock(readCloseMutex_);
socket_.async_read_some(
boost::asio::buffer(*readBuffer_),
boost::bind(&BoostConnection::handleSocketRead, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
void BoostConnection::handleSocketRead(const boost::system::error_code& error, size_t bytesTransferred) {
SWIFT_LOG(debug) << "Socket read " << error << std::endl;
if (!error) {
readBuffer_->resize(bytesTransferred);
eventLoop->postEvent(boost::bind(boost::ref(onDataRead), readBuffer_), shared_from_this());
doRead();
}
else if (/*error == boost::asio::error::eof ||*/ error == boost::asio::error::operation_aborted) {
eventLoop->postEvent(boost::bind(boost::ref(onDisconnected), boost::optional<Error>()), shared_from_this());
}
else {
eventLoop->postEvent(boost::bind(boost::ref(onDisconnected), ReadError), shared_from_this());
}
}
void BoostConnection::handleDataWritten(const boost::system::error_code& error) {
SWIFT_LOG(debug) << "Data written " << error << std::endl;
if (!error) {
eventLoop->postEvent(boost::ref(onDataWritten), shared_from_this());
}
else if (/*error == boost::asio::error::eof || */error == boost::asio::error::operation_aborted) {
eventLoop->postEvent(boost::bind(boost::ref(onDisconnected), boost::optional<Error>()), shared_from_this());
}
else {
eventLoop->postEvent(boost::bind(boost::ref(onDisconnected), WriteError), shared_from_this());
}
{
std::lock_guard<std::mutex> lock(writeMutex_);
if (writeQueue_.empty()) {
writing_ = false;
if (closeSocketAfterNextWrite_) {
closeSocket();
}
}
else {
doWrite(writeQueue_);
writeQueue_.clear();
}
}
}
HostAddressPort BoostConnection::getLocalAddress() const {
return HostAddressPort(socket_.local_endpoint());
}
HostAddressPort BoostConnection::getRemoteAddress() const {
return HostAddressPort(socket_.remote_endpoint());
}
}
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Swift