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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#pragma once
#include <memory>
#include <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/aggregation_request.h"
#include "mongo/db/pipeline/lite_parsed_document_source.h"
namespace mongo {
/**
* A semi-parsed version of a Pipeline, parsed just enough to determine information like what
* foreign collections are involved.
*/
class LiteParsedPipeline {
public:
/**
* Constructs a LiteParsedPipeline from the raw BSON stages given in 'request'.
*
* May throw a AssertionException if there is an invalid stage specification, although full
* validation happens later, during Pipeline construction.
*/
LiteParsedPipeline(const AggregationRequest& request) {
_stageSpecs.reserve(request.getPipeline().size());
for (auto&& rawStage : request.getPipeline()) {
_stageSpecs.push_back(LiteParsedDocumentSource::parse(request, rawStage));
}
}
/**
* Returns all foreign namespaces referenced by stages within this pipeline, if any.
*/
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const {
stdx::unordered_set<NamespaceString> involvedNamespaces;
for (auto&& spec : _stageSpecs) {
auto stagesInvolvedNamespaces = spec->getInvolvedNamespaces();
involvedNamespaces.insert(stagesInvolvedNamespaces.begin(),
stagesInvolvedNamespaces.end());
}
return involvedNamespaces;
}
/**
* Returns a list of the priviliges required for this pipeline.
*/
PrivilegeVector requiredPrivileges(bool isMongos) const {
PrivilegeVector requiredPrivileges;
for (auto&& spec : _stageSpecs) {
Privilege::addPrivilegesToPrivilegeVector(&requiredPrivileges,
spec->requiredPrivileges(isMongos));
}
return requiredPrivileges;
}
/**
* Returns true if the pipeline begins with a $collStats stage.
*/
bool startsWithCollStats() const {
return !_stageSpecs.empty() && _stageSpecs.front()->isCollStats();
}
/**
* Returns true if the pipeline has a $changeStream stage.
*
* TODO SERVER-29506 Require $changeStream to be the first stage.
*/
bool hasChangeStream() const {
return std::any_of(_stageSpecs.begin(), _stageSpecs.end(), [](auto&& spec) {
return spec->isChangeStream();
});
}
/**
* Returns false if the pipeline has any stage which must be run locally on mongos.
*/
bool allowedToForwardFromMongos() const {
return std::all_of(_stageSpecs.cbegin(), _stageSpecs.cend(), [](const auto& spec) {
return spec->allowedToForwardFromMongos();
});
}
private:
std::vector<std::unique_ptr<LiteParsedDocumentSource>> _stageSpecs;
};
} // namespace mongo
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