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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 <utility>
#include "mongo/db/pipeline/aggregate_command_gen.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/process_interface/stub_mongo_process_interface.h"
#include "mongo/db/query/collation/collation_spec.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/db/stats/counters.h"
#include "mongo/util/intrusive_counter.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 AggregateCommandRequest& request,
std::unique_ptr<CollatorInterface> collator,
std::shared_ptr<MongoProcessInterface> processInterface,
StringMap<ResolvedNamespace> resolvedNamespaces,
boost::optional<UUID> collUUID,
bool mayDbProfile)
: ExpressionContext(opCtx,
request.getExplain(),
request.getFromMongos(),
request.getNeedsMerge(),
request.getAllowDiskUse(),
request.getBypassDocumentValidation().value_or(false),
request.getIsMapReduceCommand(),
request.getNamespace(),
request.getLegacyRuntimeConstants(),
std::move(collator),
std::move(processInterface),
std::move(resolvedNamespaces),
std::move(collUUID),
request.getLet(),
mayDbProfile) {
if (request.getIsMapReduceCommand()) {
// mapReduce command JavaScript invocation is only subject to the server global
// 'jsHeapLimitMB' limit.
jsHeapLimitMB = boost::none;
}
}
ExpressionContext::ExpressionContext(
OperationContext* opCtx,
const boost::optional<ExplainOptions::Verbosity>& explain,
bool fromMongos,
bool needsMerge,
bool allowDiskUse,
bool bypassDocumentValidation,
bool isMapReduce,
const NamespaceString& ns,
const boost::optional<LegacyRuntimeConstants>& runtimeConstants,
std::unique_ptr<CollatorInterface> collator,
const std::shared_ptr<MongoProcessInterface>& mongoProcessInterface,
StringMap<ExpressionContext::ResolvedNamespace> resolvedNamespaces,
boost::optional<UUID> collUUID,
const boost::optional<BSONObj>& letParameters,
bool mayDbProfile)
: explain(explain),
fromMongos(fromMongos),
needsMerge(needsMerge),
allowDiskUse(allowDiskUse),
bypassDocumentValidation(bypassDocumentValidation),
ns(ns),
uuid(std::move(collUUID)),
opCtx(opCtx),
mongoProcessInterface(mongoProcessInterface),
timeZoneDatabase(getTimeZoneDatabase(opCtx)),
variablesParseState(variables.useIdGenerator()),
mayDbProfile(mayDbProfile),
_collator(std::move(collator)),
_documentComparator(_collator.get()),
_valueComparator(_collator.get()),
_resolvedNamespaces(std::move(resolvedNamespaces)) {
if (runtimeConstants && runtimeConstants->getClusterTime().isNull()) {
// Try to get a default value for clusterTime if a logical clock exists.
auto genConsts = variables.generateRuntimeConstants(opCtx);
genConsts.setJsScope(runtimeConstants->getJsScope());
genConsts.setIsMapReduce(runtimeConstants->getIsMapReduce());
variables.setLegacyRuntimeConstants(genConsts);
} else if (runtimeConstants) {
variables.setLegacyRuntimeConstants(*runtimeConstants);
} else {
variables.setDefaultRuntimeConstants(opCtx);
}
if (!isMapReduce) {
jsHeapLimitMB = internalQueryJavaScriptHeapSizeLimitMB.load();
}
if (letParameters)
variables.seedVariablesWithLetParameters(this, *letParameters);
}
ExpressionContext::ExpressionContext(
OperationContext* opCtx,
std::unique_ptr<CollatorInterface> collator,
const NamespaceString& nss,
const boost::optional<LegacyRuntimeConstants>& runtimeConstants,
const boost::optional<BSONObj>& letParameters,
bool mayDbProfile,
boost::optional<ExplainOptions::Verbosity> explain)
: explain(explain),
ns(nss),
opCtx(opCtx),
mongoProcessInterface(std::make_shared<StubMongoProcessInterface>()),
timeZoneDatabase(opCtx && opCtx->getServiceContext()
? TimeZoneDatabase::get(opCtx->getServiceContext())
: nullptr),
variablesParseState(variables.useIdGenerator()),
mayDbProfile(mayDbProfile),
_collator(std::move(collator)),
_documentComparator(_collator.get()),
_valueComparator(_collator.get()) {
if (runtimeConstants) {
variables.setLegacyRuntimeConstants(*runtimeConstants);
}
jsHeapLimitMB = internalQueryJavaScriptHeapSizeLimitMB.load();
if (letParameters)
variables.seedVariablesWithLetParameters(this, *letParameters);
}
void ExpressionContext::checkForInterruptSlow() {
// This check could be expensive, at least in relative terms, so don't check every time.
invariant(opCtx);
_interruptCounter = kInterruptCheckPeriod;
opCtx->checkForInterrupt();
}
ExpressionContext::CollatorStash::CollatorStash(ExpressionContext* const expCtx,
std::unique_ptr<CollatorInterface> newCollator)
: _expCtx(expCtx), _originalCollator(std::move(_expCtx->_collator)) {
_expCtx->setCollator(std::move(newCollator));
}
ExpressionContext::CollatorStash::~CollatorStash() {
_expCtx->setCollator(std::move(_originalCollator));
}
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)));
}
intrusive_ptr<ExpressionContext> ExpressionContext::copyWith(
NamespaceString ns,
boost::optional<UUID> uuid,
boost::optional<std::unique_ptr<CollatorInterface>> updatedCollator) const {
auto collator = updatedCollator
? std::move(*updatedCollator)
: (_collator ? _collator->clone() : std::unique_ptr<CollatorInterface>{});
auto expCtx = make_intrusive<ExpressionContext>(opCtx,
explain,
fromMongos,
needsMerge,
allowDiskUse,
bypassDocumentValidation,
false, // isMapReduce
ns,
boost::none, // runtimeConstants
std::move(collator),
mongoProcessInterface,
_resolvedNamespaces,
uuid);
expCtx->inMongos = inMongos;
expCtx->maxFeatureCompatibilityVersion = maxFeatureCompatibilityVersion;
expCtx->subPipelineDepth = subPipelineDepth;
expCtx->tempDir = tempDir;
expCtx->jsHeapLimitMB = jsHeapLimitMB;
expCtx->variables = variables;
expCtx->variablesParseState = variablesParseState.copyWith(expCtx->variables.useIdGenerator());
expCtx->exprUnstableForApiV1 = exprUnstableForApiV1;
expCtx->exprDeprectedForApiV1 = exprDeprectedForApiV1;
expCtx->initialPostBatchResumeToken = initialPostBatchResumeToken.getOwned();
expCtx->originalAggregateCommand = originalAggregateCommand.getOwned();
// 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;
}
void ExpressionContext::startExpressionCounters() {
if (!_expressionCounters) {
_expressionCounters = boost::make_optional<ExpressionCounters>({});
}
}
void ExpressionContext::incrementMatchExprCounter(StringData name) {
if (_expressionCounters) {
++_expressionCounters.get().matchExprCountersMap[name];
}
}
void ExpressionContext::stopExpressionCounters() {
if (_expressionCounters) {
operatorCountersMatchExpressions.mergeCounters(
_expressionCounters.get().matchExprCountersMap);
}
_expressionCounters = boost::none;
}
} // namespace mongo
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