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// Copyright (C) 2017-2018 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <asiolink/asio_wrapper.h>
#include <http/connection.h>
#include <http/connection_pool.h>
#include <http/http_log.h>
#include <http/http_messages.h>
#include <boost/bind.hpp>
using namespace isc::asiolink;
namespace isc {
namespace http {
void
HttpConnection::
SocketCallback::operator()(boost::system::error_code ec, size_t length) {
if (ec.value() == boost::asio::error::operation_aborted) {
return;
}
callback_(ec, length);
}
HttpConnection:: HttpConnection(asiolink::IOService& io_service,
HttpAcceptor& acceptor,
HttpConnectionPool& connection_pool,
const HttpResponseCreatorPtr& response_creator,
const HttpAcceptorCallback& callback,
const long request_timeout,
const long idle_timeout)
: request_timer_(io_service),
request_timer_setup_(false),
request_timeout_(request_timeout),
idle_timeout_(idle_timeout),
socket_(io_service),
acceptor_(acceptor),
connection_pool_(connection_pool),
response_creator_(response_creator),
request_(response_creator_->createNewHttpRequest()),
parser_(new HttpRequestParser(*request_)),
acceptor_callback_(callback),
buf_(),
output_buf_() {
parser_->initModel();
}
HttpConnection::~HttpConnection() {
close();
}
void
HttpConnection::close() {
request_timer_setup_ = false;
request_timer_.cancel();
socket_.close();
}
void
HttpConnection::stopThisConnection() {
try {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_BASIC,
HTTP_CONNECTION_STOP)
.arg(getRemoteEndpointAddressAsText());
connection_pool_.stop(shared_from_this());
} catch (...) {
LOG_ERROR(http_logger, HTTP_CONNECTION_STOP_FAILED);
}
}
void
HttpConnection::asyncAccept() {
// Create instance of the callback. It is safe to pass the local instance
// of the callback, because the underlying boost functions make copies
// as needed.
HttpAcceptorCallback cb = boost::bind(&HttpConnection::acceptorCallback,
shared_from_this(),
boost::asio::placeholders::error);
try {
acceptor_.asyncAccept(socket_, cb);
} catch (const std::exception& ex) {
isc_throw(HttpConnectionError, "unable to start accepting TCP "
"connections: " << ex.what());
}
}
void
HttpConnection::doRead() {
try {
TCPEndpoint endpoint;
// Create instance of the callback. It is safe to pass the local instance
// of the callback, because the underlying boost functions make copies
// as needed.
SocketCallback cb(boost::bind(&HttpConnection::socketReadCallback,
shared_from_this(),
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
socket_.asyncReceive(static_cast<void*>(buf_.data()), buf_.size(),
0, &endpoint, cb);
} catch (...) {
stopThisConnection();
}
}
void
HttpConnection::doWrite() {
try {
if (!output_buf_.empty()) {
// Create instance of the callback. It is safe to pass the local instance
// of the callback, because the underlying boost functions make copies
// as needed.
SocketCallback cb(boost::bind(&HttpConnection::socketWriteCallback,
shared_from_this(),
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
socket_.asyncSend(output_buf_.data(),
output_buf_.length(),
cb);
} else {
if (!request_->isPersistent()) {
stopThisConnection();
} else {
reinitProcessingState();
doRead();
}
}
} catch (...) {
stopThisConnection();
}
}
void
HttpConnection::asyncSendResponse(const ConstHttpResponsePtr& response) {
output_buf_ = response->toString();
doWrite();
}
void
HttpConnection::acceptorCallback(const boost::system::error_code& ec) {
if (!acceptor_.isOpen()) {
return;
}
if (ec) {
stopThisConnection();
}
acceptor_callback_(ec);
if (!ec) {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL,
HTTP_REQUEST_RECEIVE_START)
.arg(getRemoteEndpointAddressAsText())
.arg(static_cast<unsigned>(request_timeout_/1000));
setupRequestTimer();
doRead();
}
}
void
HttpConnection::socketReadCallback(boost::system::error_code ec, size_t length) {
if (ec) {
// IO service has been stopped and the connection is probably
// going to be shutting down.
if (ec.value() == boost::asio::error::operation_aborted) {
return;
// EWOULDBLOCK and EAGAIN are special cases. Everything else is
// treated as fatal error.
} else if ((ec.value() != boost::asio::error::try_again) &&
(ec.value() != boost::asio::error::would_block)) {
stopThisConnection();
// We got EWOULDBLOCK or EAGAIN which indicate that we may be able to
// read something from the socket on the next attempt. Just make sure
// we don't try to read anything now in case there is any garbage
// passed in length.
} else {
length = 0;
}
}
if (length != 0) {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL_DATA,
HTTP_DATA_RECEIVED)
.arg(length)
.arg(getRemoteEndpointAddressAsText());
std::string s(&buf_[0], buf_[0] + length);
parser_->postBuffer(static_cast<void*>(buf_.data()), length);
parser_->poll();
}
if (parser_->needData()) {
doRead();
} else {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL,
HTTP_REQUEST_RECEIVED)
.arg(getRemoteEndpointAddressAsText());
try {
request_->finalize();
} catch (...) {
}
HttpResponsePtr response = response_creator_->createHttpResponse(request_);
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL,
HTTP_RESPONSE_SEND)
.arg(response->toBriefString())
.arg(getRemoteEndpointAddressAsText());
asyncSendResponse(response);
}
}
void
HttpConnection::socketWriteCallback(boost::system::error_code ec, size_t length) {
if (ec) {
// IO service has been stopped and the connection is probably
// going to be shutting down.
if (ec.value() == boost::asio::error::operation_aborted) {
return;
// EWOULDBLOCK and EAGAIN are special cases. Everything else is
// treated as fatal error.
} else if ((ec.value() != boost::asio::error::try_again) &&
(ec.value() != boost::asio::error::would_block)) {
stopThisConnection();
// We got EWOULDBLOCK or EAGAIN which indicate that we may be able to
// read something from the socket on the next attempt.
} else {
doWrite();
}
}
if (length <= output_buf_.size()) {
output_buf_.erase(0, length);
doWrite();
} else {
output_buf_.clear();
if (!request_->isPersistent()) {
stopThisConnection();
} else {
reinitProcessingState();
doRead();
}
}
}
void
HttpConnection::reinitProcessingState() {
request_ = response_creator_->createNewHttpRequest();
parser_.reset(new HttpRequestParser(*request_));
parser_->initModel();
setupIdleTimer();
}
void
HttpConnection::setupRequestTimer() {
// Pass raw pointer rather than shared_ptr to this object,
// because IntervalTimer already passes shared pointer to the
// IntervalTimerImpl to make sure that the callback remains
// valid.
if (!request_timer_setup_) {
request_timer_setup_ = true;
request_timer_.setup(boost::bind(&HttpConnection::requestTimeoutCallback,
this),
request_timeout_, IntervalTimer::ONE_SHOT);
}
}
void
HttpConnection::setupIdleTimer() {
request_timer_setup_ = false;
request_timer_.setup(boost::bind(&HttpConnection::idleTimeoutCallback,
this),
idle_timeout_, IntervalTimer::ONE_SHOT);
}
void
HttpConnection::requestTimeoutCallback() {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL,
HTTP_REQUEST_TIMEOUT_OCCURRED)
.arg(getRemoteEndpointAddressAsText());
HttpResponsePtr response =
response_creator_->createStockHttpResponse(request_,
HttpStatusCode::REQUEST_TIMEOUT);
asyncSendResponse(response);
}
void
HttpConnection::idleTimeoutCallback() {
LOG_DEBUG(http_logger, isc::log::DBGLVL_TRACE_DETAIL,
HTTP_IDLE_CONNECTION_TIMEOUT_OCCURRED)
.arg(getRemoteEndpointAddressAsText());
stopThisConnection();
}
std::string
HttpConnection::getRemoteEndpointAddressAsText() const {
try {
if (socket_.getASIOSocket().is_open()) {
return (socket_.getASIOSocket().remote_endpoint().address().to_string());
}
} catch (...) {
}
return ("(unknown address)");
}
} // end of namespace isc::http
} // end of namespace isc
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