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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "TcpTransport.h"
#include "ConnectionContext.h"
#include "qpid/sys/AsynchIO.h"
#include "qpid/sys/ConnectionCodec.h"
#include "qpid/sys/Poller.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
#include <boost/format.hpp>
using namespace qpid::sys;
namespace qpid {
namespace messaging {
namespace amqp {
// Static constructor which registers connector here
namespace {
Transport* create(TransportContext& c, Poller::shared_ptr p)
{
return new TcpTransport(c, p);
}
struct StaticInit
{
StaticInit()
{
Transport::add("tcp", &create);
};
} init;
}
TcpTransport::TcpTransport(TransportContext& c, boost::shared_ptr<Poller> p) : socket(createSocket()), context(c), connector(0), aio(0), poller(p) {}
void TcpTransport::connect(const std::string& host, const std::string& port)
{
assert(!connector);
assert(!aio);
connector = AsynchConnector::create(
*socket,
host, port,
boost::bind(&TcpTransport::connected, this, _1),
boost::bind(&TcpTransport::failed, this, _3));
connector->start(poller);
}
void TcpTransport::failed(const std::string& msg)
{
QPID_LOG(debug, "Failed to connect: " << msg);
connector = 0;
socket->close();
context.closed();
}
void TcpTransport::connected(const Socket&)
{
context.opened();
connector = 0;
aio = AsynchIO::create(*socket,
boost::bind(&TcpTransport::read, this, _1, _2),
boost::bind(&TcpTransport::eof, this, _1),
boost::bind(&TcpTransport::disconnected, this, _1),
boost::bind(&TcpTransport::socketClosed, this, _1, _2),
0, // nobuffs
boost::bind(&TcpTransport::write, this, _1));
aio->createBuffers(std::numeric_limits<uint16_t>::max());//note: AMQP 1.0 _can_ handle large frame sizes
id = boost::str(boost::format("[%1%]") % socket->getFullAddress());
aio->start(poller);
}
void TcpTransport::read(AsynchIO&, AsynchIO::BufferBase* buffer)
{
int32_t decoded = context.getCodec().decode(buffer->bytes+buffer->dataStart, buffer->dataCount);
if (decoded < buffer->dataCount) {
// Adjust buffer for used bytes and then "unread them"
buffer->dataStart += decoded;
buffer->dataCount -= decoded;
aio->unread(buffer);
} else {
// Give whole buffer back to aio subsystem
aio->queueReadBuffer(buffer);
}
}
void TcpTransport::write(AsynchIO&)
{
if (context.getCodec().canEncode()) {
AsynchIO::BufferBase* buffer = aio->getQueuedBuffer();
if (buffer) {
size_t encoded = context.getCodec().encode(buffer->bytes, buffer->byteCount);
buffer->dataStart = 0;
buffer->dataCount = encoded;
aio->queueWrite(buffer);
}
}
}
void TcpTransport::close()
{
QPID_LOG(debug, id << " TcpTransport closing...");
if (aio)
aio->queueWriteClose();
}
void TcpTransport::eof(AsynchIO&)
{
close();
}
void TcpTransport::disconnected(AsynchIO&)
{
close();
socketClosed(*aio, *socket);
}
void TcpTransport::socketClosed(AsynchIO&, const Socket&)
{
if (aio)
aio->queueForDeletion();
context.closed();
QPID_LOG(debug, id << " Socket closed");
}
void TcpTransport::abort()
{
if (aio) {
// Established connection
aio->requestCallback(boost::bind(&TcpTransport::eof, this, _1));
} else if (connector) {
// We're still connecting
connector->stop();
failed("Connection timedout");
}
}
void TcpTransport::activateOutput()
{
if (aio) aio->notifyPendingWrite();
}
}}} // namespace qpid::messaging::amqp
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