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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 <memory>
#include "mongo/db/operation_context.h"
#include "mongo/executor/async_rpc.h"
#include "mongo/s/async_rpc_shard_targeter.h"
#include "mongo/s/transaction_router.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT mongo::logv2::LogComponent::kExecutor
namespace mongo::async_rpc {
/**
* This function operates in the same way as `async_rpc::sendCommand`, but will attach transaction
* metadata from the opCtx to the command BSONObject metadata before sending to the targeted
* shardId.
*/
template <typename CommandType>
ExecutorFuture<AsyncRPCResponse<typename CommandType::Reply>> sendTxnCommand(
std::shared_ptr<AsyncRPCOptions<CommandType>> options,
OperationContext* opCtx,
std::unique_ptr<ShardIdTargeter> targeter) {
using ReplyType = AsyncRPCResponse<typename CommandType::Reply>;
// Execute the command after extracting the db name and bson from the CommandType.
// Wrapping this function allows us to separate the CommandType parsing logic from the
// implementation details of executing the remote command asynchronously.
auto runner = detail::AsyncRPCRunner::get(opCtx->getServiceContext());
auto cmdBSON = options->cmd.toBSON({});
const auto shardId = targeter->getShardId();
if (auto txnRouter = TransactionRouter::get(opCtx); txnRouter) {
cmdBSON = txnRouter.attachTxnFieldsIfNeeded(opCtx, targeter->getShardId(), cmdBSON);
}
auto genericArgs =
options->genericArgs.stable.toBSON().addFields(options->genericArgs.unstable.toBSON());
auto cmdBsonWithArgs = cmdBSON.addFields(genericArgs);
return detail::sendCommandWithRunner(
cmdBsonWithArgs, options, runner, opCtx, std::move(targeter))
.onCompletion([opCtx, shardId](StatusWith<ReplyType> swResponse) -> StatusWith<ReplyType> {
auto txnRouter = TransactionRouter::get(opCtx);
if (!txnRouter) {
return swResponse;
}
if (swResponse.isOK()) {
ReplyType reply = swResponse.getValue();
GenericReplyFields gens = reply.genericReplyFields;
// The TransactionRouter expects a raw-BSON command-response
// in its API for processing transaction metadata. The async_rpc API
// doesn't expose the raw-BSON of the response in the case of command-success,
// so we construct a fake one for now to appease the TxnRouter API.
auto fakeResponseObj = [&] {
BSONObjBuilder bob;
gens.stable.serialize(&bob);
gens.unstable.serialize(&bob);
return bob.obj();
}();
txnRouter.processParticipantResponse(opCtx, shardId, fakeResponseObj);
} else {
auto extraInfo = swResponse.getStatus().template extraInfo<AsyncRPCErrorInfo>();
if (extraInfo->isRemote()) {
auto remoteError = extraInfo->asRemote();
txnRouter.processParticipantResponse(
opCtx, shardId, remoteError.getResponseObj());
}
}
return swResponse;
})
.thenRunOn(options->exec);
}
} // namespace mongo::async_rpc
#undef MONGO_LOGV2_DEFAULT_COMPONENT
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