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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.
*/
#include "mongo/transport/grpc/mock_server_stream.h"
#include "mongo/db/service_context.h"
#include "mongo/transport/grpc/mock_util.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/interruptible.h"
namespace mongo::transport::grpc {
MockServerStream::MockServerStream(HostAndPort remote,
Promise<MetadataContainer>&& initialMetadataPromise,
Promise<::grpc::Status>&& rpcTerminationStatusPromise,
std::shared_ptr<MockCancellationState> rpcCancellationState,
BidirectionalPipe::End&& serverPipeEnd,
MetadataView clientMetadata)
: _remote(std::move(remote)),
_initialMetadata(std::move(initialMetadataPromise)),
_rpcReturnStatus(std::move(rpcTerminationStatusPromise)),
_finalStatusReturned(false),
_rpcCancellationState(std::move(rpcCancellationState)),
_pipe{std::move(serverPipeEnd)},
_clientMetadata{std::move(clientMetadata)} {}
boost::optional<SharedBuffer> MockServerStream::read() {
invariant(!*_finalStatusReturned);
return runWithDeadline<boost::optional<SharedBuffer>>(
_rpcCancellationState->getDeadline(), [&](Interruptible* i) { return _pipe.read(i); });
}
bool MockServerStream::isCancelled() const {
return _rpcCancellationState->isCancelled();
}
bool MockServerStream::write(ConstSharedBuffer msg) {
invariant(!*_finalStatusReturned);
if (isCancelled()) {
return false;
}
_initialMetadata.trySend();
return runWithDeadline<bool>(_rpcCancellationState->getDeadline(),
[&](Interruptible* i) { return _pipe.write(msg, i); });
}
void MockServerStream::sendReturnStatus(::grpc::Status status) {
{
auto finalStatusReturned = _finalStatusReturned.synchronize();
invariant(!*finalStatusReturned);
*finalStatusReturned = true;
// Client side ignores the mocked return value in the event of a cancellation, so don't need
// to check if stream has been cancelled before sending the status.
}
_rpcReturnStatus.emplaceValue(std::move(status));
_pipe.close();
}
void MockServerStream::cancel(::grpc::Status status) {
// Only mark the RPC as cancelled if a status hasn't already been returned to client.
auto finalStatusReturned = _finalStatusReturned.synchronize();
if (*finalStatusReturned) {
return;
}
// Need to update the cancellation state before closing the pipe so that when a stream
// read/write is interrupted, the cancellation state will already be up to date.
_rpcCancellationState->cancel(std::move(status));
_pipe.close();
}
} // namespace mongo::transport::grpc
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