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// hashcmd.cpp
/**
* Copyright (C) 2012 10gen 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/>.
*/
/*
* Defines a shell command for hashing a BSONElement value
*/
#include <string>
#include <vector>
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/commands.h"
#include "mongo/db/hasher.h"
#include "mongo/db/jsobj.h"
namespace mongo {
// Testing only, enabled via command-line.
class CmdHashElt : public Command {
public:
CmdHashElt() : Command("_hashBSONElement") {};
virtual LockType locktype() const { return NONE; }
virtual bool slaveOk() const { return true; }
// No auth needed because it only works when enabled via command line.
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {}
virtual void help( stringstream& help ) const {
help << "returns the hash of the first BSONElement val in a BSONObj";
}
/* CmdObj has the form {"hash" : <thingToHash>}
* or {"hash" : <thingToHash>, "seed" : <number> }
* Result has the form
* {"key" : <thingTohash>, "seed" : <int>, "out": NumberLong(<hash>)}
*
* Example use in the shell:
*> db.runCommand({hash: "hashthis", seed: 1})
*> {"key" : "hashthis",
*> "seed" : 1,
*> "out" : NumberLong(6271151123721111923),
*> "ok" : 1 }
**/
bool run( const string& db,
BSONObj& cmdObj,
int options, string& errmsg,
BSONObjBuilder& result,
bool fromRepl = false ){
result.appendAs(cmdObj.firstElement(),"key");
int seed = 0;
if (cmdObj.hasField("seed")){
if (! cmdObj["seed"].isNumber()) {
errmsg += "seed must be a number";
return false;
}
seed = cmdObj["seed"].numberInt();
}
result.append( "seed" , seed );
result.append( "out" , BSONElementHasher::hash64( cmdObj.firstElement() , seed ) );
return true;
}
};
MONGO_INITIALIZER(RegisterHashEltCmd)(InitializerContext* context) {
if (Command::testCommandsEnabled) {
// Leaked intentionally: a Command registers itself when constructed.
new CmdHashElt();
}
return Status::OK();
}
}
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