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// dbeval.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/>.
*
* 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include <boost/scoped_ptr.hpp>
#include <time.h>
#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_manager_global.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/introspect.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/json.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/log.h"
namespace mongo {
using boost::scoped_ptr;
using std::dec;
using std::endl;
using std::string;
using std::stringstream;
const int edebug=0;
static bool dbEval(OperationContext* txn,
const string& dbName,
const BSONObj& cmd,
BSONObjBuilder& result,
string& errmsg) {
BSONElement e = cmd.firstElement();
uassert( 10046 , "eval needs Code" , e.type() == Code || e.type() == CodeWScope || e.type() == String );
const char *code = 0;
switch ( e.type() ) {
case String:
case Code:
code = e.valuestr();
break;
case CodeWScope:
code = e.codeWScopeCode();
break;
default:
verify(0);
}
verify( code );
if ( ! globalScriptEngine ) {
errmsg = "db side execution is disabled";
return false;
}
scoped_ptr<Scope> s(globalScriptEngine->newScope());
s->registerOperation(txn);
ScriptingFunction f = s->createFunction(code);
if ( f == 0 ) {
errmsg = (string)"compile failed: " + s->getError();
return false;
}
s->localConnectForDbEval(txn, dbName.c_str());
if ( e.type() == CodeWScope )
s->init( e.codeWScopeScopeDataUnsafe() );
BSONObj args;
{
BSONElement argsElement = cmd.getField("args");
if ( argsElement.type() == Array ) {
args = argsElement.embeddedObject();
if ( edebug ) {
log() << "args:" << args.toString() << endl;
log() << "code:\n" << code << endl;
}
}
}
int res;
{
Timer t;
res = s->invoke(f, &args, 0, 0);
int m = t.millis();
if (m > serverGlobalParams.slowMS) {
log() << "dbeval slow, time: " << dec << m << "ms " << dbName << endl;
if ( m >= 1000 ) log() << code << endl;
else OCCASIONALLY log() << code << endl;
}
}
if (res || s->isLastRetNativeCode()) {
result.append("errno", (double) res);
errmsg = "invoke failed: ";
if (s->isLastRetNativeCode())
errmsg += "cannot return native function";
else
errmsg += s->getError();
return false;
}
s->append( result , "retval" , "__returnValue" );
return true;
}
// SERVER-4328 todo review for concurrency
class CmdEval : public Command {
public:
virtual bool slaveOk() const {
return false;
}
virtual void help( stringstream &help ) const {
help << "Evaluate javascript at the server.\n" "http://dochub.mongodb.org/core/serversidecodeexecution";
}
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
RoleGraph::generateUniversalPrivileges(out);
}
CmdEval() : Command("eval", false, "$eval") { }
bool run(OperationContext* txn, const string& dbname , BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
if ( cmdObj["nolock"].trueValue() ) {
return dbEval(txn, dbname, cmdObj, result, errmsg);
}
ScopedTransaction transaction(txn, MODE_X);
Lock::GlobalWrite lk(txn->lockState());
// No WriteUnitOfWork necessary, as dbEval will create its own, see "nolock" case above
Client::Context ctx(txn, dbname );
return dbEval(txn, dbname, cmdObj, result, errmsg);
}
} cmdeval;
} // namespace mongo
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