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/**
* Copyright (c) 2011-2014 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/base/init.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/run_aggregate.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/pipeline.h"
#include "mongo/db/server_options.h"
namespace mongo {
namespace {
bool isMergePipeline(const std::vector<BSONObj>& pipeline) {
if (pipeline.empty()) {
return false;
}
return pipeline[0].hasField("$mergeCursors");
}
class PipelineCommand : public Command {
public:
PipelineCommand()
: Command(AggregationRequest::kCommandName) {} // command is called "aggregate"
// Locks are managed manually, in particular by DocumentSourceCursor.
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return Pipeline::aggSupportsWriteConcern(cmd);
}
virtual bool slaveOk() const {
return false;
}
virtual bool slaveOverrideOk() const {
return true;
}
bool supportsReadConcern() const final {
return true;
}
ReadWriteType getReadWriteType() const {
return ReadWriteType::kRead;
}
virtual void help(std::stringstream& help) const {
help << "{ pipeline: [ { $stage: {...} }, ... ]"
<< ", allowDiskUse: <bool>"
<< ", cursor: {batchSize: <number>}"
<< ", ..."
<< " }" << std::endl
<< "See http://dochub.mongodb.org/core/aggregation for more details.";
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) final {
const NamespaceString nss(parseNsCollectionRequired(dbname, cmdObj));
return AuthorizationSession::get(client)->checkAuthForAggregate(nss, cmdObj);
}
virtual bool run(OperationContext* opCtx,
const std::string& db,
BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& result) {
const NamespaceString nss(parseNsCollectionRequired(db, cmdObj));
// Parse the options for this request.
auto request = AggregationRequest::parseFromBSON(nss, cmdObj);
if (!request.isOK()) {
return appendCommandStatus(result, request.getStatus());
}
// If the featureCompatibilityVersion is 3.2, we disallow collation from the user. However,
// operations should still respect the collection default collation. The mongos attaches the
// collection default collation to the merger pipeline, since the merger may not have the
// collection metadata. So the merger needs to accept a collation, and we rely on the shards
// to reject collations from the user.
if (!request.getValue().getCollation().isEmpty() &&
serverGlobalParams.featureCompatibility.version.load() ==
ServerGlobalParams::FeatureCompatibility::Version::k32 &&
!isMergePipeline(request.getValue().getPipeline())) {
return appendCommandStatus(
result,
Status(ErrorCodes::InvalidOptions,
"The featureCompatibilityVersion must be 3.4 to use collation. See "
"http://dochub.mongodb.org/core/3.4-feature-compatibility."));
}
return appendCommandStatus(result,
runAggregate(opCtx, nss, request.getValue(), cmdObj, result));
}
Status explain(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj,
ExplainOptions::Verbosity verbosity,
const rpc::ServerSelectionMetadata& serverSelectionMetadata,
BSONObjBuilder* out) const override {
const NamespaceString nss(parseNsCollectionRequired(dbName, cmdObj));
// Parse the options for this request, supplying the explain verbosity separately.
auto request = AggregationRequest::parseFromBSON(nss, cmdObj, verbosity);
if (!request.isOK()) {
return request.getStatus();
}
// If the featureCompatibilityVersion is 3.2, we disallow collation from the user. However,
// operations should still respect the collection default collation. The mongos attaches the
// collection default collation to the merger pipeline, since the merger may not have the
// collection metadata. So the merger needs to accept a collation, and we rely on the shards
// to reject collations from the user.
if (!request.getValue().getCollation().isEmpty() &&
serverGlobalParams.featureCompatibility.version.load() ==
ServerGlobalParams::FeatureCompatibility::Version::k32 &&
!isMergePipeline(request.getValue().getPipeline())) {
return Status(ErrorCodes::InvalidOptions,
"The featureCompatibilityVersion must be 3.4 to use collation. See "
"http://dochub.mongodb.org/core/3.4-feature-compatibility.");
}
return runAggregate(opCtx, nss, request.getValue(), cmdObj, *out);
}
};
MONGO_INITIALIZER(PipelineCommand)(InitializerContext* context) {
new PipelineCommand();
return Status::OK();
}
} // namespace
} // namespace mongo
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