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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/base/system_error.h"
#include "mongo/db/stats/counters.h"
#include "mongo/transport/asio_utils.h"
#include "mongo/transport/ticket_asio.h"
#include "mongo/util/log.h"
#include "mongo/transport/session_asio.h"
namespace mongo {
namespace transport {
namespace {
constexpr auto kHeaderSize = sizeof(MSGHEADER::Value);
} // namespace
std::shared_ptr<TransportLayerASIO::ASIOSession> TransportLayerASIO::ASIOTicket::getSession() {
auto session = _session.lock();
if (!session || !session->isOpen()) {
finishFill(Ticket::SessionClosedStatus);
return nullptr;
}
return session;
}
bool TransportLayerASIO::ASIOTicket::isSync() const {
return _fillSync;
}
TransportLayerASIO::ASIOTicket::ASIOTicket(const ASIOSessionHandle& session, Date_t expiration)
: _session(session), _sessionId(session->id()), _expiration(expiration) {}
TransportLayerASIO::ASIOSourceTicket::ASIOSourceTicket(const ASIOSessionHandle& session,
Date_t expiration,
Message* msg)
: ASIOTicket(session, expiration), _target(msg) {}
TransportLayerASIO::ASIOSinkTicket::ASIOSinkTicket(const ASIOSessionHandle& session,
Date_t expiration,
const Message& msg)
: ASIOTicket(session, expiration), _msgToSend(msg) {}
void TransportLayerASIO::ASIOSourceTicket::_bodyCallback(const Status& status, size_t size) {
if (!status.isOK()) {
finishFill(status);
return;
}
_target->setData(std::move(_buffer));
networkCounter.hitPhysicalIn(_target->size());
finishFill(Status::OK());
}
void TransportLayerASIO::ASIOSourceTicket::_headerCallback(const Status& status, size_t size) {
if (!status.isOK()) {
finishFill(status);
return;
}
auto session = getSession();
if (!session)
return;
if (session->checkForHTTPRequest(asio::buffer(_buffer.get(), size))) {
return session->sendHTTPResponse(isSync(), [this](Status status) { finishFill(status); });
}
MSGHEADER::View headerView(_buffer.get());
auto msgLen = static_cast<size_t>(headerView.getMessageLength());
if (msgLen < kHeaderSize || msgLen > MaxMessageSizeBytes) {
StringBuilder sb;
sb << "recv(): message msgLen " << msgLen << " is invalid. "
<< "Min " << kHeaderSize << " Max: " << MaxMessageSizeBytes;
const auto str = sb.str();
LOG(0) << str;
finishFill(Status(ErrorCodes::ProtocolError, str));
return;
}
if (msgLen == size) {
finishFill(Status::OK());
return;
}
_buffer.realloc(msgLen);
MsgData::View msgView(_buffer.get());
session->read(isSync(),
asio::buffer(msgView.data(), msgView.dataLen()),
[this](const Status& status, size_t size) { _bodyCallback(status, size); });
}
void TransportLayerASIO::ASIOSourceTicket::fillImpl() {
auto session = getSession();
if (!session)
return;
const auto initBufSize = kHeaderSize;
_buffer = SharedBuffer::allocate(initBufSize);
session->read(isSync(),
asio::buffer(_buffer.get(), initBufSize),
[this](const Status& status, size_t size) { _headerCallback(status, size); });
}
void TransportLayerASIO::ASIOSinkTicket::_sinkCallback(const Status& status, size_t size) {
networkCounter.hitPhysicalOut(_msgToSend.size());
finishFill(status);
}
void TransportLayerASIO::ASIOSinkTicket::fillImpl() {
auto session = getSession();
if (!session)
return;
session->write(isSync(),
asio::buffer(_msgToSend.buf(), _msgToSend.size()),
[this](const Status& status, size_t size) { _sinkCallback(status, size); });
}
void TransportLayerASIO::ASIOTicket::finishFill(Status status) {
// We want to make sure that a Ticket can only be filled once; filling a ticket invalidates it.
// So we check that the _fillCallback is set, then move it out of the ticket and into a local
// variable, and then call that. It's illegal to interact with the ticket after calling the
// fillCallback, so we have to move it out of _fillCallback so there are no writes to any
// variables in ASIOTicket after it gets called.
invariant(_fillCallback);
auto fillCallback = std::move(_fillCallback);
fillCallback(status);
}
void TransportLayerASIO::ASIOTicket::fill(bool sync, TicketCallback&& cb) {
_fillSync = sync;
dassert(!_fillCallback);
_fillCallback = std::move(cb);
fillImpl();
}
} // namespace transport
} // namespace mongo
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