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/**
* Copyright (C) 2021-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 "mongo/platform/basic.h"
#include "mongo/client/mongo_uri.h"
#include "mongo/executor/task_executor.h"
#include "mongo/s/is_mongos.h"
#include "mongo/transport/transport_layer.h"
#include "mongo/util/duration.h"
#include "mongo/util/future.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/timer.h"
namespace mongo {
/**
* Interface for the ReplicaSetMonitorTransport. Implementations of this interface obtain a respone
* to the 'hello' command with a provided timeout.
*/
class ReplicaSetMonitorTransport {
public:
/**
* Runs the 'hello' command on 'host' and returns the result. If the timeout value is reached,
* the Future result will contain the error.
*/
virtual Future<BSONObj> sayHello(HostAndPort host,
const std::string& setName,
const MongoURI& setUri,
Milliseconds timeout) noexcept = 0;
virtual ~ReplicaSetMonitorTransport();
};
using ReplicaSetMonitorTransportPtr = std::unique_ptr<ReplicaSetMonitorTransport>;
/**
* This class uses the DBClient object to make hello requests. It is utilized in unit tests
* to accomodate mocking the hello responses.
*/
class ReplicaSetMonitorDbClientTransport : public ReplicaSetMonitorTransport {
public:
Future<BSONObj> sayHello(HostAndPort host,
const std::string& setName,
const MongoURI& setUri,
Milliseconds timeout) noexcept override;
};
/**
* This class is used in the production version of the server to obtain hello responses.
* It uses an executor to run the hello commands with an appropriate timeout value. The
* executor should be multithreaded to accomodate TCP requests that do not get a reply in a
* timely fashion.
*/
class ReplicaSetMonitorExecutorTransport : public ReplicaSetMonitorTransport {
public:
explicit ReplicaSetMonitorExecutorTransport(executor::TaskExecutor* executor);
Future<BSONObj> sayHello(HostAndPort host,
const std::string& setName,
const MongoURI& setUri,
Milliseconds timeout) noexcept override;
private:
void _haltIfIncompatibleServer(Status status);
struct HelloRequest {
HelloRequest(HostAndPort h, Promise<BSONObj>&& p)
: host(h), timer(Timer()), promise(std::move(p)) {}
HostAndPort host;
Timer timer;
Promise<BSONObj> promise;
};
executor::TaskExecutor* const _executor;
};
}
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