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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/expression_context.h"
#include "mongo/db/pipeline/stub_mongo_process_interface.h"
#include "mongo/db/query/collation/collation_spec.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
namespace mongo {
using boost::intrusive_ptr;
ExpressionContext::ResolvedNamespace::ResolvedNamespace(NamespaceString ns,
std::vector<BSONObj> pipeline)
: ns(std::move(ns)), pipeline(std::move(pipeline)) {}
ExpressionContext::ExpressionContext(OperationContext* opCtx,
const AggregationRequest& request,
std::unique_ptr<CollatorInterface> collator,
std::shared_ptr<MongoProcessInterface> processInterface,
StringMap<ResolvedNamespace> resolvedNamespaces,
boost::optional<UUID> collUUID)
: ExpressionContext(opCtx, collator.get()) {
explain = request.getExplain();
comment = request.getComment();
fromMongos = request.isFromMongos();
needsMerge = request.needsMerge();
allowDiskUse = request.shouldAllowDiskUse();
bypassDocumentValidation = request.shouldBypassDocumentValidation();
ns = request.getNamespaceString();
mongoProcessInterface = std::move(processInterface);
collation = request.getCollation();
_ownedCollator = std::move(collator);
_resolvedNamespaces = std::move(resolvedNamespaces);
uuid = std::move(collUUID);
}
ExpressionContext::ExpressionContext(OperationContext* opCtx, const CollatorInterface* collator)
: opCtx(opCtx),
mongoProcessInterface(std::make_shared<StubMongoProcessInterface>()),
timeZoneDatabase(opCtx && opCtx->getServiceContext()
? TimeZoneDatabase::get(opCtx->getServiceContext())
: nullptr),
variablesParseState(variables.useIdGenerator()),
_collator(collator),
_documentComparator(_collator),
_valueComparator(_collator) {}
ExpressionContext::ExpressionContext(NamespaceString nss,
std::shared_ptr<MongoProcessInterface> processInterface,
const TimeZoneDatabase* tzDb)
: ns(std::move(nss)),
mongoProcessInterface(std::move(processInterface)),
timeZoneDatabase(tzDb),
variablesParseState(variables.useIdGenerator()) {}
void ExpressionContext::checkForInterrupt() {
// This check could be expensive, at least in relative terms, so don't check every time.
if (--_interruptCounter == 0) {
invariant(opCtx);
_interruptCounter = kInterruptCheckPeriod;
opCtx->checkForInterrupt();
}
}
ExpressionContext::CollatorStash::CollatorStash(
const boost::intrusive_ptr<ExpressionContext>& expCtx,
std::unique_ptr<CollatorInterface> newCollator)
: _expCtx(expCtx),
_originalCollation(_expCtx->collation),
_originalCollatorOwned(std::move(_expCtx->_ownedCollator)),
_originalCollatorUnowned(_expCtx->_collator) {
_expCtx->setCollator(std::move(newCollator));
_expCtx->collation =
_expCtx->getCollator() ? _expCtx->getCollator()->getSpec().toBSON().getOwned() : BSONObj();
}
ExpressionContext::CollatorStash::~CollatorStash() {
if (_originalCollatorOwned) {
_expCtx->setCollator(std::move(_originalCollatorOwned));
} else {
_expCtx->setCollator(_originalCollatorUnowned);
if (!_originalCollatorUnowned && _expCtx->_ownedCollator) {
// If the original collation was 'nullptr', we cannot distinguish whether it was owned
// or not. We always set '_ownedCollator' with the stash, so should reset it to null
// here.
_expCtx->_ownedCollator = nullptr;
}
}
_expCtx->collation = _originalCollation;
}
std::unique_ptr<ExpressionContext::CollatorStash> ExpressionContext::temporarilyChangeCollator(
std::unique_ptr<CollatorInterface> newCollator) {
// This constructor of CollatorStash is private, so we can't use make_unique().
return std::unique_ptr<CollatorStash>(new CollatorStash(this, std::move(newCollator)));
}
void ExpressionContext::setCollator(const CollatorInterface* collator) {
_collator = collator;
// Document/Value comparisons must be aware of the collation.
_documentComparator = DocumentComparator(_collator);
_valueComparator = ValueComparator(_collator);
}
intrusive_ptr<ExpressionContext> ExpressionContext::copyWith(
NamespaceString ns,
boost::optional<UUID> uuid,
boost::optional<std::unique_ptr<CollatorInterface>> collator) const {
intrusive_ptr<ExpressionContext> expCtx =
new ExpressionContext(std::move(ns), mongoProcessInterface, timeZoneDatabase);
expCtx->uuid = std::move(uuid);
expCtx->explain = explain;
expCtx->comment = comment;
expCtx->needsMerge = needsMerge;
expCtx->fromMongos = fromMongos;
expCtx->inMongos = inMongos;
expCtx->allowDiskUse = allowDiskUse;
expCtx->bypassDocumentValidation = bypassDocumentValidation;
expCtx->subPipelineDepth = subPipelineDepth;
expCtx->tempDir = tempDir;
expCtx->opCtx = opCtx;
if (collator) {
expCtx->collation =
*collator ? (*collator)->getSpec().toBSON() : CollationSpec::kSimpleSpec;
expCtx->setCollator(std::move(*collator));
} else {
expCtx->collation = collation;
if (_ownedCollator) {
expCtx->setCollator(_ownedCollator->clone());
} else if (_collator) {
expCtx->setCollator(_collator);
}
}
expCtx->_resolvedNamespaces = _resolvedNamespaces;
// Note that we intentionally skip copying the value of '_interruptCounter' because 'expCtx' is
// intended to be used for executing a separate aggregation pipeline.
return expCtx;
}
} // namespace mongo
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