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/**
* Copyright (C) 2023-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 <map>
#include <string>
#include <boost/optional.hpp>
#include <grpcpp/grpcpp.h>
#include <grpcpp/support/status.h>
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/util/interruptible.h"
#include "mongo/util/synchronized_value.h"
#include "mongo/util/time_support.h"
namespace mongo::transport::grpc {
/**
* Class containing the shared cancellation state between a MockServerStream and its corresponding
* MockClientStream. This mocks cases in which an RPC is terminated before the server's RPC handler
* is able to return a status (e.g. explicit client/server cancellation or a network error).
*/
class MockCancellationState {
public:
explicit MockCancellationState(Date_t deadline) : _deadline(deadline) {}
Date_t getDeadline() const {
return _deadline;
}
bool isCancelled() const {
return _cancellationStatus->has_value() || isDeadlineExceeded();
}
bool isDeadlineExceeded() const {
return getGlobalServiceContext()->getFastClockSource()->now() > _deadline;
}
boost::optional<::grpc::Status> getCancellationStatus() {
if (auto status = _cancellationStatus.synchronize(); status->has_value()) {
return *status;
} else if (isDeadlineExceeded()) {
return ::grpc::Status(::grpc::StatusCode::DEADLINE_EXCEEDED, "Deadline exceeded");
} else {
return boost::none;
}
}
void cancel(::grpc::Status status) {
auto statusGuard = _cancellationStatus.synchronize();
if (statusGuard->has_value()) {
return;
}
*statusGuard = std::move(status);
}
private:
Date_t _deadline;
synchronized_value<boost::optional<::grpc::Status>> _cancellationStatus;
};
/**
* Performs the provided lambda and returns its return value. If the lambda's execution is
* interrupted due to the deadline being exceeded, this returns a default-constructed T instead.
*/
template <typename T, typename F>
T runWithDeadline(Date_t deadline, F f) {
auto svcCtx = getGlobalServiceContext();
if (svcCtx->getFastClockSource()->now() > deadline) {
return T();
}
auto cl = svcCtx->makeClient("MockGRPCTimer");
AlternativeClientRegion acr(cl);
auto opCtx = cc().makeOperationContext();
opCtx->setDeadlineByDate(deadline, ErrorCodes::ExceededTimeLimit);
try {
return f(opCtx.get());
} catch (const ExceptionFor<ErrorCodes::ExceededTimeLimit>&) {
return T();
}
}
} // namespace mongo::transport::grpc
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