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/**
* Copyright (C) 2008 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.
*/
#include <sstream>
#include <string>
#include <vector>
#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/auth/privilege.h"
#include "mongo/db/auth/resource_pattern.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/dbhash.h"
#include "mongo/db/instance.h"
#include "mongo/db/matcher/matcher.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/operation_context_impl.h"
namespace mongo {
class ApplyOpsCmd : public Command {
public:
virtual bool slaveOk() const { return false; }
virtual bool isWriteCommandForConfigServer() const { return true; }
ApplyOpsCmd() : Command( "applyOps" ) {}
virtual void help( stringstream &help ) const {
help << "internal (sharding)\n{ applyOps : [ ] , preCondition : [ { ns : ... , q : ... , res : ... } ] }";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
// applyOps can do pretty much anything, so require all privileges.
RoleGraph::generateUniversalPrivileges(out);
}
virtual bool run(OperationContext* txn, const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
if ( cmdObj.firstElement().type() != Array ) {
errmsg = "ops has to be an array";
return false;
}
BSONObj ops = cmdObj.firstElement().Obj();
{
// check input
BSONObjIterator i( ops );
while ( i.more() ) {
BSONElement e = i.next();
if ( e.type() == Object )
continue;
errmsg = "op not an object: ";
errmsg += e.fieldName();
return false;
}
}
// SERVER-4328 todo : is global ok or does this take a long time? i believe multiple
// ns used so locking individually requires more analysis
Lock::GlobalWrite globalWriteLock(txn->lockState());
DBDirectClient db(txn);
// Preconditions check reads the database state, so needs to be done locked
if ( cmdObj["preCondition"].type() == Array ) {
BSONObjIterator i( cmdObj["preCondition"].Obj() );
while ( i.more() ) {
BSONObj f = i.next().Obj();
DBDirectClient db( txn );
BSONObj realres = db.findOne( f["ns"].String() , f["q"].Obj() );
// Apply-ops would never have a $where matcher, so use the default callback,
// which will throw an error if $where is found.
Matcher m(f["res"].Obj());
if ( ! m.matches( realres ) ) {
result.append( "got" , realres );
result.append( "whatFailed" , f );
errmsg = "pre-condition failed";
return false;
}
}
}
// apply
int num = 0;
int errors = 0;
BSONObjIterator i( ops );
BSONArrayBuilder ab;
const bool alwaysUpsert = cmdObj.hasField("alwaysUpsert") ?
cmdObj["alwaysUpsert"].trueValue() : true;
while ( i.more() ) {
BSONElement e = i.next();
const BSONObj& temp = e.Obj();
string ns = temp["ns"].String();
// Run operations under a nested lock as a hack to prevent them from yielding.
//
// The list of operations is supposed to be applied atomically; yielding would break
// atomicity by allowing an interruption or a shutdown to occur after only some
// operations are applied. We are already locked globally at this point, so taking
// a DBWrite on the namespace creates a nested lock, and yields are disallowed for
// operations that hold a nested lock.
//
// We do not have a wrapping WriteUnitOfWork so it is possible for a journal commit
// to happen with a subset of ops applied.
// TODO figure out what to do about this.
Lock::DBWrite lk(txn->lockState(), ns);
invariant(txn->lockState()->isRecursive());
Client::Context ctx(txn, ns);
bool failed = repl::applyOperation_inlock(txn,
ctx.db(),
temp,
false,
alwaysUpsert);
ab.append(!failed);
if ( failed )
errors++;
num++;
logOpForDbHash(ns.c_str());
}
result.append( "applied" , num );
result.append( "results" , ab.arr() );
if ( ! fromRepl ) {
// We want this applied atomically on slaves
// so we re-wrap without the pre-condition for speed
string tempNS = str::stream() << dbname << ".$cmd";
// TODO: possibly use mutable BSON to remove preCondition field
// once it is available
BSONObjIterator iter(cmdObj);
BSONObjBuilder cmdBuilder;
while (iter.more()) {
BSONElement elem(iter.next());
if (strcmp(elem.fieldName(), "preCondition") != 0) {
cmdBuilder.append(elem);
}
}
repl::logOp(txn, "c", tempNS.c_str(), cmdBuilder.done());
}
if (errors != 0) {
return false;
}
return true;
}
} applyOpsCmd;
}
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