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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_client_stream.h"
#include "mongo/transport/grpc/mock_util.h"
#include "mongo/util/interruptible.h"
namespace mongo::transport::grpc {
MockClientStream::MockClientStream(HostAndPort remote,
Future<MetadataContainer>&& initialMetadataFuture,
Future<::grpc::Status>&& rpcReturnStatus,
std::shared_ptr<MockCancellationState> rpcCancellationState,
BidirectionalPipe::End&& pipe)
: _remote{std::move(remote)},
_serverInitialMetadata{std::move(initialMetadataFuture)},
_rpcReturnStatus{std::move(rpcReturnStatus)},
_rpcCancellationState(std::move(rpcCancellationState)),
_pipe{std::move(pipe)} {}
boost::optional<SharedBuffer> MockClientStream::read() {
// Even if the server side handler of this stream has set a final status for the RPC (i.e.
// _rpcReturnStatus is ready), there may still be unread messages in the queue that the server
// sent before setting that status, so only return early here if the RPC was cancelled.
// Otherwise, try to read whatever messages are in the queue.
if (_rpcCancellationState->isCancelled()) {
return boost::none;
}
return runWithDeadline<boost::optional<SharedBuffer>>(
_rpcCancellationState->getDeadline(), [&](Interruptible* i) { return _pipe.read(i); });
}
bool MockClientStream::write(ConstSharedBuffer msg) {
if (_rpcCancellationState->isCancelled() || _rpcReturnStatus.isReady()) {
return false;
}
return runWithDeadline<bool>(_rpcCancellationState->getDeadline(),
[&](Interruptible* i) { return _pipe.write(msg, i); });
}
::grpc::Status MockClientStream::finish() {
// We use a busy wait here because there is no easy way to wait until all the messages in the
// pipe have been read.
while (!_pipe.isConsumed() && !_rpcCancellationState->isDeadlineExceeded()) {
sleepFor(Milliseconds(1));
}
invariant(_rpcReturnStatus.isReady() || _rpcCancellationState->isCancelled());
if (auto cancellationStatus = _rpcCancellationState->getCancellationStatus();
cancellationStatus.has_value()) {
return *cancellationStatus;
}
return _rpcReturnStatus.get();
}
void MockClientStream::_cancel() {
_rpcCancellationState->cancel(::grpc::Status::CANCELLED);
_pipe.close();
}
} // namespace mongo::transport::grpc
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