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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 "mongo/platform/basic.h"
#include "mongo/s/multi_statement_transaction_requests_sender.h"
#include "mongo/db/operation_context.h"
#include "mongo/s/transaction_router.h"
namespace mongo {
namespace {
std::vector<AsyncRequestsSender::Request> attachTxnDetails(
OperationContext* opCtx, const std::vector<AsyncRequestsSender::Request>& requests) {
auto txnRouter = TransactionRouter::get(opCtx);
if (!txnRouter) {
return requests;
}
std::vector<AsyncRequestsSender::Request> newRequests;
newRequests.reserve(requests.size());
for (auto request : requests) {
newRequests.emplace_back(
request.shardId,
txnRouter.attachTxnFieldsIfNeeded(opCtx, request.shardId, request.cmdObj));
}
return newRequests;
}
void processReplyMetadata(OperationContext* opCtx, const AsyncRequestsSender::Response& response) {
auto txnRouter = TransactionRouter::get(opCtx);
if (!txnRouter) {
return;
}
if (!response.swResponse.isOK()) {
return;
}
txnRouter.processParticipantResponse(
opCtx, response.shardId, response.swResponse.getValue().data);
}
} // unnamed namespace
MultiStatementTransactionRequestsSender::MultiStatementTransactionRequestsSender(
OperationContext* opCtx,
std::shared_ptr<executor::TaskExecutor> executor,
StringData dbName,
const std::vector<AsyncRequestsSender::Request>& requests,
const ReadPreferenceSetting& readPreference,
Shard::RetryPolicy retryPolicy)
: _opCtx(opCtx),
_ars(std::make_unique<AsyncRequestsSender>(opCtx,
std::move(executor),
dbName,
attachTxnDetails(opCtx, requests),
readPreference,
retryPolicy)) {}
MultiStatementTransactionRequestsSender::~MultiStatementTransactionRequestsSender() {
invariant(_opCtx);
auto baton = _opCtx->getBaton();
invariant(baton);
// Delegate the destruction of `_ars` to the `_opCtx` baton to potentially move the cost off of
// the critical path. The assumption is that postponing the destruction is safe so long as the
// `_opCtx` that corresponds to `_ars` remains alive.
baton->schedule([ars = std::move(_ars)](Status) mutable { ars.reset(); });
}
bool MultiStatementTransactionRequestsSender::done() {
return _ars->done();
}
AsyncRequestsSender::Response MultiStatementTransactionRequestsSender::next() {
const auto response = _ars->next();
processReplyMetadata(_opCtx, response);
return response;
}
void MultiStatementTransactionRequestsSender::stopRetrying() {
_ars->stopRetrying();
}
} // namespace mongo
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