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/**
* Copyright (C) 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/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/s/cluster_explain.h"
#include "mongo/s/strategy.h"
#include "mongo/util/timer.h"
namespace mongo {
using std::auto_ptr;
using std::string;
using std::vector;
/**
* Implements the find command on mongos.
*
* TODO: this is just a placeholder. It needs to be implemented for real under SERVER-15176.
*/
class ClusterFindCmd : public Command {
MONGO_DISALLOW_COPYING(ClusterFindCmd);
public:
ClusterFindCmd() : Command("find") { }
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual bool slaveOk() const { return false; }
virtual bool slaveOverrideOk() const { return true; }
virtual bool maintenanceOk() const { return false; }
virtual bool adminOnly() const { return false; }
virtual void help(std::stringstream& help) const {
help << "query for documents";
}
/**
* In order to run the find command, you must be authorized for the "find" action
* type on the collection.
*/
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
ResourcePattern pattern = parseResourcePattern(dbname, cmdObj);
if (authzSession->isAuthorizedForActionsOnResource(pattern, ActionType::find)) {
return Status::OK();
}
return Status(ErrorCodes::Unauthorized, "unauthorized");
}
virtual Status explain(OperationContext* txn,
const std::string& dbname,
const BSONObj& cmdObj,
ExplainCommon::Verbosity verbosity,
BSONObjBuilder* out) const {
const string fullns = parseNs(dbname, cmdObj);
// Parse the command BSON to a LiteParsedQuery.
LiteParsedQuery* rawLpq;
bool isExplain = true;
Status lpqStatus = LiteParsedQuery::make(fullns, cmdObj, isExplain, &rawLpq);
if (!lpqStatus.isOK()) {
return lpqStatus;
}
auto_ptr<LiteParsedQuery> lpq(rawLpq);
BSONObjBuilder explainCmdBob;
ClusterExplain::wrapAsExplain(cmdObj, verbosity, &explainCmdBob);
// We will time how long it takes to run the commands on the shards.
Timer timer;
vector<Strategy::CommandResult> shardResults;
Strategy::commandOp(dbname,
explainCmdBob.obj(),
lpq->getOptions(),
fullns,
lpq->getFilter(),
&shardResults);
long long millisElapsed = timer.millis();
const char* mongosStageName = ClusterExplain::getStageNameForReadOp(shardResults, cmdObj);
return ClusterExplain::buildExplainResult(shardResults,
mongosStageName,
millisElapsed,
out);
}
virtual bool run(OperationContext* txn,
const std::string& dbname,
BSONObj& cmdObj, int options,
std::string& errmsg,
BSONObjBuilder& result) {
// Currently only explains of finds run through the find command. Queries that are not
// explained use the legacy OP_QUERY path.
errmsg = "find command not yet implemented";
return false;
}
} cmdFindCluster;
} // namespace mongo
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