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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/db/pipeline/lite_parsed_pipeline.h"
#include "mongo/db/operation_context.h"
namespace mongo {
ReadConcernSupportResult LiteParsedPipeline::supportsReadConcern(
repl::ReadConcernLevel level,
boost::optional<ExplainOptions::Verbosity> explain,
bool enableMajorityReadConcern) const {
// Start by assuming that we will support both readConcern and cluster-wide default.
ReadConcernSupportResult result = ReadConcernSupportResult::allSupportedAndDefaultPermitted();
// 1. Determine whether the given read concern must be rejected for any pipeline-global reasons.
if (!hasChangeStream() && !enableMajorityReadConcern &&
(level == repl::ReadConcernLevel::kMajorityReadConcern)) {
// Reject non change stream aggregation queries that try to use "majority" read concern when
// enableMajorityReadConcern=false.
result.readConcernSupport = {
ErrorCodes::ReadConcernMajorityNotEnabled,
"Only change stream aggregation queries support 'majority' read concern when "
"enableMajorityReadConcern=false"};
} else if (explain && level != repl::ReadConcernLevel::kLocalReadConcern) {
// Reject non-local read concern when the pipeline is being explained.
result.readConcernSupport = {
ErrorCodes::InvalidOptions,
str::stream() << "Explain for the aggregate command cannot run with a readConcern "
<< "other than 'local'. Current readConcern level: "
<< repl::readConcernLevels::toString(level)};
}
// 2. Determine whether the default read concern must be denied for any pipeline-global reasons.
if (explain) {
result.defaultReadConcernPermit = {
ErrorCodes::InvalidOptions,
"Explain for the aggregate command does not permit default readConcern to be "
"applied."};
}
// 3. If either the specified or default readConcern have not already been rejected, determine
// whether the pipeline stages support them. If not, we record the first error we encounter.
for (auto&& spec : _stageSpecs) {
// If both result statuses are already not OK, stop checking further stages.
if (!result.readConcernSupport.isOK() && !result.defaultReadConcernPermit.isOK()) {
break;
}
result.merge(spec->supportsReadConcern(level));
}
return result;
}
void LiteParsedPipeline::assertSupportsMultiDocumentTransaction(
boost::optional<ExplainOptions::Verbosity> explain) const {
uassert(ErrorCodes::OperationNotSupportedInTransaction,
"Operation not permitted in transaction :: caused by :: Explain for the aggregate "
"command cannot run within a multi-document transaction",
!explain);
for (auto&& spec : _stageSpecs) {
spec->assertSupportsMultiDocumentTransaction();
}
}
void LiteParsedPipeline::verifyIsSupported(
OperationContext* opCtx,
const std::function<bool(OperationContext*, const NamespaceString&)> isSharded,
const boost::optional<ExplainOptions::Verbosity> explain,
bool enableMajorityReadConcern) const {
// Verify litePipe can be run in a transaction.
if (opCtx->inMultiDocumentTransaction()) {
assertSupportsMultiDocumentTransaction(explain);
}
// Verify that no involved namespace is sharded unless allowed by the pipeline.
for (const auto& nss : getInvolvedNamespaces()) {
uassert(28769,
str::stream() << nss.ns() << " cannot be sharded",
allowShardedForeignCollection(nss) || !isSharded(opCtx, nss));
}
}
} // namespace mongo
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