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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/auth/authorization_session.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"
namespace mongo {
namespace {
bool isMergePipeline(const std::vector<BSONObj>& pipeline) {
if (pipeline.empty()) {
return false;
}
return pipeline[0].hasField("$mergeCursors");
}
class PipelineCommand final : public Command {
public:
PipelineCommand() : Command("aggregate") {}
std::unique_ptr<CommandInvocation> parse(OperationContext* opCtx,
const OpMsgRequest& opMsgRequest) override {
// TODO: Parsing to a Pipeline and/or AggregationRequest here.
auto privileges =
uassertStatusOK(AuthorizationSession::get(opCtx->getClient())
->getPrivilegesForAggregate(
AggregationRequest::parseNs(
opMsgRequest.getDatabase().toString(), opMsgRequest.body),
opMsgRequest.body,
false));
return std::make_unique<Invocation>(this, opMsgRequest, std::move(privileges));
}
class Invocation final : public CommandInvocation {
public:
Invocation(Command* cmd, const OpMsgRequest& request, PrivilegeVector privileges)
: CommandInvocation(cmd),
_request(request),
_dbName(request.getDatabase().toString()),
_privileges(std::move(privileges)) {}
private:
bool supportsWriteConcern() const override {
return true;
}
bool canIgnorePrepareConflicts() const override {
// Aggregate is a special case for prepare conflicts. It may do writes to an output
// collection, but it enables enforcement of prepare conflicts before doing so.
return true;
}
bool supportsReadConcern(repl::ReadConcernLevel level) const override {
// Aggregations that are run directly against a collection allow any read concern.
// Otherwise, if the aggregate is collectionless then the read concern must be 'local'
// (e.g. $currentOp). The exception to this is a $changeStream on a whole database,
// which is considered collectionless but must be read concern 'majority'. Further read
// concern validation is done one the pipeline is parsed.
return level == repl::ReadConcernLevel::kLocalReadConcern ||
level == repl::ReadConcernLevel::kMajorityReadConcern ||
!AggregationRequest::parseNs(_dbName, _request.body).isCollectionlessAggregateNS();
}
bool allowsSpeculativeMajorityReads() const override {
// Currently only change stream aggregation queries are allowed to use speculative
// majority. The aggregation command itself will check this internally and fail if
// necessary.
return true;
}
void run(OperationContext* opCtx, rpc::ReplyBuilderInterface* reply) override {
CommandHelpers::handleMarkKillOnClientDisconnect(
opCtx, !Pipeline::aggHasWriteStage(_request.body));
const auto aggregationRequest = uassertStatusOK(
AggregationRequest::parseFromBSON(_dbName, _request.body, boost::none));
uassertStatusOK(runAggregate(opCtx,
aggregationRequest.getNamespaceString(),
aggregationRequest,
_request.body,
_privileges,
reply));
}
NamespaceString ns() const override {
return AggregationRequest::parseNs(_dbName, _request.body);
}
void explain(OperationContext* opCtx,
ExplainOptions::Verbosity verbosity,
rpc::ReplyBuilderInterface* result) override {
const auto aggregationRequest = uassertStatusOK(
AggregationRequest::parseFromBSON(_dbName, _request.body, verbosity));
uassertStatusOK(runAggregate(opCtx,
aggregationRequest.getNamespaceString(),
aggregationRequest,
_request.body,
_privileges,
result));
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForPrivileges(_privileges));
}
const OpMsgRequest& _request;
const std::string _dbName;
const PrivilegeVector _privileges;
};
std::string help() const override {
return "Runs the aggregation command. See http://dochub.mongodb.org/core/aggregation for "
"more details.";
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kOptIn;
}
ReadWriteType getReadWriteType() const {
return ReadWriteType::kRead;
}
} pipelineCmd;
} // namespace
} // namespace mongo
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