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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.
*/
#include <boost/optional.hpp>
#include <memory>
#include "mongo/base/status_with.h"
#include "mongo/executor/network_connection_hook.h"
namespace mongo {
namespace executor {
/**
* A utility for creating one-off NetworkConnectionHook instances from inline lambdas. This is
* only to be used in testing code, not in production.
*/
template <typename ValidateFunc, typename RequestFunc, typename ReplyFunc>
class TestConnectionHook final : public NetworkConnectionHook {
public:
TestConnectionHook(ValidateFunc&& validateFunc,
RequestFunc&& requestFunc,
ReplyFunc&& replyFunc)
: _validateFunc(std::forward<ValidateFunc>(validateFunc)),
_requestFunc(std::forward<RequestFunc>(requestFunc)),
_replyFunc(std::forward<ReplyFunc>(replyFunc)) {}
Status validateHost(const HostAndPort& remoteHost,
const BSONObj& request,
const RemoteCommandResponse& isMasterReply) override {
return _validateFunc(remoteHost, request, isMasterReply);
}
StatusWith<boost::optional<RemoteCommandRequest>> makeRequest(const HostAndPort& remoteHost) {
return _requestFunc(remoteHost);
}
Status handleReply(const HostAndPort& remoteHost, RemoteCommandResponse&& response) {
return _replyFunc(remoteHost, std::move(response));
}
private:
ValidateFunc _validateFunc;
RequestFunc _requestFunc;
ReplyFunc _replyFunc;
};
/**
* Factory function for TestConnectionHook instances. Needed for template type deduction, so that
* one can instantiate a TestConnectionHook instance without uttering the unutterable (types).
*/
template <typename Val, typename Req, typename Rep>
std::unique_ptr<TestConnectionHook<Val, Req, Rep>> makeTestHook(Val&& validateFunc,
Req&& requestFunc,
Rep&& replyFunc) {
return std::make_unique<TestConnectionHook<Val, Req, Rep>>(std::forward<Val>(validateFunc),
std::forward<Req>(requestFunc),
std::forward<Rep>(replyFunc));
}
} // namespace executor
} // namespace mongo
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