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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.hpp>
#include <cstdint>
#include <queue>
#include <memory>
#include <unordered_map>
#include "mongo/executor/async_stream_factory_interface.h"
#include "mongo/executor/async_stream_interface.h"
#include "mongo/executor/remote_command_request.h"
#include "mongo/executor/remote_command_response.h"
#include "mongo/rpc/protocol.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/functional.h"
#include "mongo/stdx/mutex.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
namespace executor {
class AsyncStreamInterface;
class AsyncMockStreamFactory final : public AsyncStreamFactoryInterface {
public:
AsyncMockStreamFactory() = default;
std::unique_ptr<AsyncStreamInterface> makeStream(asio::io_service::strand* strand,
const HostAndPort& host) override;
class MockStream final : public AsyncStreamInterface {
public:
MockStream(asio::io_service::strand* strand,
AsyncMockStreamFactory* factory,
const HostAndPort& target);
// Use unscoped enum so we can specialize on it
enum StreamState {
kRunning,
kBlockedBeforeConnect,
kBlockedBeforeRead,
kBlockedAfterWrite,
kCanceled,
};
~MockStream();
void connect(asio::ip::tcp::resolver::iterator endpoints,
ConnectHandler&& connectHandler) override;
void write(asio::const_buffer buf, StreamHandler&& writeHandler) override;
void read(asio::mutable_buffer buf, StreamHandler&& readHandler) override;
bool isOpen() override;
HostAndPort target();
StreamState waitUntilBlocked();
void cancel() override;
std::vector<uint8_t> popWrite();
void pushRead(std::vector<uint8_t> toRead);
void setError(std::error_code ec);
void unblock();
void simulateServer(
rpc::Protocol proto,
const stdx::function<RemoteCommandResponse(RemoteCommandRequest)> replyFunc);
private:
using Action = stdx::function<void()>;
void _defer(StreamState state, Action&& handler);
void _defer_inlock(StreamState state, Action&& handler);
void _unblock_inlock();
asio::io_service::strand* _strand;
AsyncMockStreamFactory* _factory;
HostAndPort _target;
stdx::mutex _mutex;
stdx::condition_variable _deferredCV;
StreamState _state{kRunning};
std::queue<std::vector<uint8_t>> _readQueue;
std::queue<std::vector<uint8_t>> _writeQueue;
std::error_code _error;
Action _deferredAction;
};
MockStream* blockUntilStreamExists(const HostAndPort& host);
private:
void _createStream(const HostAndPort& host, MockStream* stream);
void _destroyStream(const HostAndPort& host);
stdx::mutex _factoryMutex;
stdx::condition_variable _factoryCv;
std::unordered_map<HostAndPort, MockStream*> _streams;
};
template <int EventType>
class StreamEvent {
public:
StreamEvent(AsyncMockStreamFactory::MockStream* stream) : _stream(stream) {
ASSERT(stream->waitUntilBlocked() == EventType);
}
void skip() {
_stream->unblock();
skipped = true;
}
~StreamEvent() {
if (!skipped) {
skip();
}
}
private:
bool skipped = false;
AsyncMockStreamFactory::MockStream* _stream = nullptr;
};
using ReadEvent = StreamEvent<AsyncMockStreamFactory::MockStream::StreamState::kBlockedBeforeRead>;
using WriteEvent = StreamEvent<AsyncMockStreamFactory::MockStream::StreamState::kBlockedAfterWrite>;
using ConnectEvent =
StreamEvent<AsyncMockStreamFactory::MockStream::StreamState::kBlockedBeforeConnect>;
} // namespace executor
} // namespace mongo
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