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/** * Copyright (C) 2015 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.
*/
#pragma once
#include <asio/system_timer.hpp>
#include <memory>
#include "mongo/executor/async_stream_interface.h"
#include "mongo/executor/connection_pool.h"
#include "mongo/executor/network_interface.h"
#include "mongo/executor/network_interface_asio.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
namespace executor {
namespace connection_pool_asio {
/**
* Implements connection pool timers on top of asio
*/
class ASIOTimer final : public ConnectionPool::TimerInterface {
public:
using clock_type = asio::system_timer::clock_type;
ASIOTimer(asio::io_service::strand* strand);
~ASIOTimer();
void setTimeout(Milliseconds timeout, TimeoutCallback cb) override;
void cancelTimeout() override;
private:
struct CallbackSharedState {
stdx::mutex mutex;
std::size_t id = 0;
};
TimeoutCallback _cb;
asio::io_service::strand* const _strand;
asio::basic_waitable_timer<clock_type> _impl;
std::shared_ptr<CallbackSharedState> _callbackSharedState;
};
/**
* Implements connection pool connections on top of asio
*
* Owns an async op when it's out of the pool
*/
class ASIOConnection final : public ConnectionPool::ConnectionInterface {
public:
ASIOConnection(const HostAndPort& hostAndPort, size_t generation, ASIOImpl* global);
void indicateSuccess() override;
void indicateFailure(Status status) override;
const HostAndPort& getHostAndPort() const override;
std::unique_ptr<NetworkInterfaceASIO::AsyncOp> releaseAsyncOp();
void bindAsyncOp(std::unique_ptr<NetworkInterfaceASIO::AsyncOp> op);
bool isHealthy() override;
private:
void indicateUsed() override;
Date_t getLastUsed() const override;
const Status& getStatus() const override;
void setTimeout(Milliseconds timeout, TimeoutCallback cb) override;
void cancelTimeout() override;
void setup(Milliseconds timeout, SetupCallback cb) override;
void resetToUnknown() override;
void refresh(Milliseconds timeout, RefreshCallback cb) override;
size_t getGeneration() const override;
static std::unique_ptr<NetworkInterfaceASIO::AsyncOp> makeAsyncOp(ASIOConnection* conn);
static Message makeIsMasterRequest(ASIOConnection* conn);
private:
SetupCallback _setupCallback;
RefreshCallback _refreshCallback;
ASIOImpl* const _global;
Date_t _lastUsed;
Status _status = ConnectionPool::kConnectionStateUnknown;
HostAndPort _hostAndPort;
size_t _generation;
std::unique_ptr<NetworkInterfaceASIO::AsyncOp> _impl;
ASIOTimer _timer;
};
/**
* Implementions connection pool implementation for asio
*/
class ASIOImpl final : public ConnectionPool::DependentTypeFactoryInterface {
friend class ASIOConnection;
public:
ASIOImpl(NetworkInterfaceASIO* impl);
std::unique_ptr<ConnectionPool::ConnectionInterface> makeConnection(
const HostAndPort& hostAndPort, size_t generation) override;
std::unique_ptr<ConnectionPool::TimerInterface> makeTimer() override;
Date_t now() override;
private:
NetworkInterfaceASIO* const _impl;
};
} // namespace connection_pool_asio
} // namespace executor
} // namespace mongo
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