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/**
* Copyright (C) 2022-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/db/pipeline/document_source_internal_all_collection_stats.h"
#include "mongo/db/pipeline/document_source_project.h"
namespace mongo {
using boost::intrusive_ptr;
DocumentSourceInternalAllCollectionStats::DocumentSourceInternalAllCollectionStats(
const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
DocumentSourceInternalAllCollectionStatsSpec spec)
: DocumentSource(kStageNameInternal, pExpCtx),
_internalAllCollectionStatsSpec(std::move(spec)) {}
REGISTER_DOCUMENT_SOURCE(_internalAllCollectionStats,
DocumentSourceInternalAllCollectionStats::LiteParsed::parse,
DocumentSourceInternalAllCollectionStats::createFromBsonInternal,
AllowedWithApiStrict::kInternal);
DocumentSource::GetNextResult DocumentSourceInternalAllCollectionStats::doGetNext() {
if (!_catalogDocs) {
_catalogDocs = pExpCtx->mongoProcessInterface->listCatalog(pExpCtx->opCtx);
}
while (!_catalogDocs->empty()) {
BSONObj obj(std::move(_catalogDocs->front()));
NamespaceString nss(obj["ns"].String());
_catalogDocs->pop_front();
// Avoid computing stats for collections that do not match the absorbed filter on the 'ns'
// field.
if (_absorbedMatch && !_absorbedMatch->getMatchExpression()->matchesBSON(std::move(obj))) {
continue;
}
if (const auto& stats = _internalAllCollectionStatsSpec.getStats()) {
try {
return {Document{DocumentSourceCollStats::makeStatsForNs(
pExpCtx, nss, stats.get(), _projectFilter)}};
} catch (const ExceptionFor<ErrorCodes::CommandNotSupportedOnView>&) {
// We don't want to retrieve data for views, only for collections.
continue;
}
}
}
return GetNextResult::makeEOF();
}
Pipeline::SourceContainer::iterator DocumentSourceInternalAllCollectionStats::doOptimizeAt(
Pipeline::SourceContainer::iterator itr, Pipeline::SourceContainer* container) {
invariant(*itr == this);
if (std::next(itr) == container->end()) {
return container->end();
}
// Attempt to internalize any predicates of a $project stage in order to calculate only
// necessary fields.
if (auto nextProject =
dynamic_cast<DocumentSourceSingleDocumentTransformation*>((*std::next(itr)).get())) {
_projectFilter =
nextProject->getTransformer().serializeTransformation(boost::none).toBson();
}
// Attempt to internalize any predicates of a $match upon the "ns" field.
auto nextMatch = dynamic_cast<DocumentSourceMatch*>((*std::next(itr)).get());
if (!nextMatch) {
return std::next(itr);
}
auto splitMatch = std::move(*nextMatch).splitSourceBy({"ns"}, {});
invariant(splitMatch.first || splitMatch.second);
// Remove the original $match.
container->erase(std::next(itr));
// Absorb the part of $match that is dependant on 'ns'
if (splitMatch.second) {
if (!_absorbedMatch) {
_absorbedMatch = std::move(splitMatch.second);
} else {
// We have already absorbed a $match. We need to join it with splitMatch.second.
_absorbedMatch->joinMatchWith(std::move(splitMatch.second));
}
}
// splitMatch.first is independent of 'ns'. Put it back on the pipeline.
if (splitMatch.first) {
container->insert(std::next(itr), std::move(splitMatch.first));
return std::next(itr);
} else {
// There may be further optimization between this stage and the new neighbor, so we return
// an iterator pointing to ourself.
return itr;
}
}
void DocumentSourceInternalAllCollectionStats::serializeToArray(
std::vector<Value>& array, boost::optional<ExplainOptions::Verbosity> explain) const {
if (explain) {
BSONObjBuilder bob;
_internalAllCollectionStatsSpec.serialize(&bob);
if (_absorbedMatch) {
bob.append("match", _absorbedMatch->getQuery());
}
auto doc = Document{{getSourceName(), bob.obj()}};
array.push_back(Value(doc));
} else {
array.push_back(serialize(explain));
if (_absorbedMatch) {
_absorbedMatch->serializeToArray(array);
}
}
}
intrusive_ptr<DocumentSource> DocumentSourceInternalAllCollectionStats::createFromBsonInternal(
BSONElement elem, const intrusive_ptr<ExpressionContext>& pExpCtx) {
uassert(6789103,
str::stream() << "$_internalAllCollectionStats must take a nested object but found: "
<< elem,
elem.type() == BSONType::Object);
uassert(6789104,
"The $_internalAllCollectionStats stage must be run on the admin database",
pExpCtx->ns.isAdminDB() && pExpCtx->ns.isCollectionlessAggregateNS());
auto spec = DocumentSourceInternalAllCollectionStatsSpec::parse(
IDLParserContext(kStageNameInternal), elem.embeddedObject());
return make_intrusive<DocumentSourceInternalAllCollectionStats>(pExpCtx, std::move(spec));
}
const char* DocumentSourceInternalAllCollectionStats::getSourceName() const {
return kStageNameInternal.rawData();
}
Value DocumentSourceInternalAllCollectionStats::serialize(
boost::optional<ExplainOptions::Verbosity> explain) const {
return Value(Document{{getSourceName(), _internalAllCollectionStatsSpec.toBSON()}});
}
} // namespace mongo
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