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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#pragma once
#include <functional>
#include <memory>
#include <string>
#include "mongo/base/status_with.h"
#include "mongo/config.h"
#include "mongo/db/server_options.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/thread.h"
#include "mongo/transport/transport_layer.h"
#include "mongo/transport/transport_mode.h"
#include "mongo/util/fail_point.h"
#include "mongo/util/hierarchical_acquisition.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/net/ssl_options.h"
#include "mongo/util/net/ssl_types.h"
namespace asio {
class io_context;
template <typename Protocol>
class basic_socket_acceptor;
namespace generic {
class stream_protocol;
} // namespace generic
namespace ssl {
class context;
} // namespace ssl
} // namespace asio
namespace mongo {
class ServiceContext;
class ServiceEntryPoint;
namespace transport {
// This fail point simulates reads and writes that always return 1 byte and fail with EAGAIN
extern FailPoint transportLayerASIOshortOpportunisticReadWrite;
// This fail point will cause an asyncConnect to timeout after it's successfully connected
// to the remote peer
extern FailPoint transportLayerASIOasyncConnectTimesOut;
/**
* A TransportLayer implementation based on ASIO networking primitives.
*/
class TransportLayerASIO final : public TransportLayer {
TransportLayerASIO(const TransportLayerASIO&) = delete;
TransportLayerASIO& operator=(const TransportLayerASIO&) = delete;
public:
constexpr static auto kSlowOperationThreshold = Seconds(1);
struct Options {
constexpr static auto kIngress = 0x1;
constexpr static auto kEgress = 0x10;
explicit Options(const ServerGlobalParams* params);
Options() = default;
int mode = kIngress | kEgress;
bool isIngress() const {
return mode & kIngress;
}
bool isEgress() const {
return mode & kEgress;
}
int port = ServerGlobalParams::DefaultDBPort; // port to bind to
std::vector<std::string> ipList; // addresses to bind to
#ifndef _WIN32
bool useUnixSockets = true; // whether to allow UNIX sockets in ipList
#endif
bool enableIPv6 = false; // whether to allow IPv6 sockets in ipList
Mode transportMode = Mode::kSynchronous; // whether accepted sockets should be put into
// non-blocking mode after they're accepted
size_t maxConns = DEFAULT_MAX_CONN; // maximum number of active connections
};
TransportLayerASIO(const Options& opts, ServiceEntryPoint* sep);
virtual ~TransportLayerASIO();
StatusWith<SessionHandle> connect(HostAndPort peer,
ConnectSSLMode sslMode,
Milliseconds timeout) final;
Future<SessionHandle> asyncConnect(HostAndPort peer,
ConnectSSLMode sslMode,
const ReactorHandle& reactor,
Milliseconds timeout) final;
Status setup() final;
ReactorHandle getReactor(WhichReactor which) final;
Status start() final;
void shutdown() final;
int listenerPort() const {
return _listenerPort;
}
#ifdef __linux__
BatonHandle makeBaton(OperationContext* opCtx) const override;
#endif
private:
class BatonASIO;
class ASIOSession;
class ASIOReactor;
using ASIOSessionHandle = std::shared_ptr<ASIOSession>;
using ConstASIOSessionHandle = std::shared_ptr<const ASIOSession>;
using GenericAcceptor = asio::basic_socket_acceptor<asio::generic::stream_protocol>;
void _acceptConnection(GenericAcceptor& acceptor);
template <typename Endpoint>
StatusWith<ASIOSessionHandle> _doSyncConnect(Endpoint endpoint,
const HostAndPort& peer,
const Milliseconds& timeout);
void _runListener() noexcept;
#ifdef MONGO_CONFIG_SSL
SSLParams::SSLModes _sslMode() const;
#endif
Mutex _mutex = MONGO_MAKE_LATCH(HierarchicalAcquisitionLevel(0), "TransportLayerASIO::_mutex");
// There are three reactors that are used by TransportLayerASIO. The _ingressReactor contains
// all the accepted sockets and all ingress networking activity. The _acceptorReactor contains
// all the sockets in _acceptors. The _egressReactor contains egress connections.
//
// TransportLayerASIO should never call run() on the _ingressReactor.
// In synchronous mode, this will cause a massive performance degradation due to
// unnecessary wakeups on the asio thread for sockets we don't intend to interact
// with asynchronously. The additional IO context avoids registering those sockets
// with the acceptors epoll set, thus avoiding those wakeups. Calling run will
// undo that benefit.
//
// TransportLayerASIO should run its own thread that calls run() on the _acceptorReactor
// to process calls to async_accept - this is the equivalent of the "listener" thread in
// other TransportLayers.
//
// The underlying problem that caused this is here:
// https://github.com/chriskohlhoff/asio/issues/240
//
// It is important that the reactors be declared before the vector of acceptors (or any other
// state that is associated with the reactors), so that we destroy any existing acceptors or
// other reactor associated state before we drop the refcount on the reactor, which may destroy
// it.
std::shared_ptr<ASIOReactor> _ingressReactor;
std::shared_ptr<ASIOReactor> _egressReactor;
std::shared_ptr<ASIOReactor> _acceptorReactor;
#ifdef MONGO_CONFIG_SSL
std::unique_ptr<asio::ssl::context> _ingressSSLContext;
std::unique_ptr<asio::ssl::context> _egressSSLContext;
#endif
std::vector<std::pair<SockAddr, GenericAcceptor>> _acceptors;
// Only used if _listenerOptions.async is false.
struct Listener {
stdx::thread thread;
stdx::condition_variable cv;
bool active = false;
};
Listener _listener;
ServiceEntryPoint* const _sep = nullptr;
Options _listenerOptions;
// The real incoming port in case of _listenerOptions.port==0 (ephemeral).
int _listenerPort = 0;
bool _isShutdown = false;
};
} // namespace transport
} // namespace mongo
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