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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/commands/explain_cmd.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/query/explain.h"
#include "mongo/db/query/get_runner.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
static CmdExplain cmdExplain;
Status CmdExplain::checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
if (Object != cmdObj.firstElement().type()) {
return Status(ErrorCodes::BadValue, "explain command requires a nested object");
}
BSONObj explainObj = cmdObj.firstElement().Obj();
Command* commToExplain = Command::findCommand(explainObj.firstElementFieldName());
if (NULL == commToExplain) {
mongoutils::str::stream ss;
ss << "unknown command: " << explainObj.firstElementFieldName();
return Status(ErrorCodes::CommandNotFound, ss);
}
return commToExplain->checkAuthForCommand(client, dbname, explainObj);
}
bool CmdExplain::run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj, int options,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl) {
// Get the verbosity.
Explain::Verbosity verbosity = Explain::QUERY_PLANNER;
if (!cmdObj["verbosity"].eoo()) {
const char* verbStr = cmdObj["verbosity"].valuestrsafe();
if (mongoutils::str::equals(verbStr, "executionStats")) {
verbosity = Explain::EXEC_STATS;
}
else if (mongoutils::str::equals(verbStr, "allPlansExecution")) {
verbosity = Explain::EXEC_ALL_PLANS;
}
else if (!mongoutils::str::equals(verbStr, "queryPlanner")) {
errmsg = "verbosity string must be one of "
"{'queryPlanner', 'executionStats', 'allPlansExecution'}";
return false;
}
}
if (Object != cmdObj.firstElement().type()) {
errmsg = "explain command requires a nested object";
return false;
}
// This is the nested command which we are explaining.
BSONObj explainObj = cmdObj.firstElement().Obj();
const string ns = parseNs(dbname, explainObj);
Command* commToExplain = Command::findCommand(explainObj.firstElementFieldName());
if (NULL == commToExplain) {
mongoutils::str::stream ss;
ss << "unknown command: " << explainObj.firstElementFieldName();
Status explainStatus(ErrorCodes::CommandNotFound, ss);
return appendCommandStatus(result, explainStatus);
}
// Actually call the nested command's explain(...) method.
Status explainStatus = commToExplain->explain(txn, dbname, explainObj, verbosity, &result);
if (!explainStatus.isOK()) {
return appendCommandStatus(result, explainStatus);
}
return true;
}
} // namespace mongo
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