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// get_last_error.cpp
/**
* Copyright (C) 2013 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 "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/write_concern.h"
namespace mongo {
/* reset any errors so that getlasterror comes back clean.
useful before performing a long series of operations where we want to
see if any of the operations triggered an error, but don't want to check
after each op as that woudl be a client/server turnaround.
*/
class CmdResetError : public Command {
public:
virtual LockType locktype() const { return NONE; }
virtual bool logTheOp() {
return false;
}
virtual bool slaveOk() const {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
virtual void help( stringstream& help ) const {
help << "reset error state (used with getpreverror)";
}
CmdResetError() : Command("resetError", false, "reseterror") {}
bool run(const string& db, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
LastError *le = lastError.get();
verify( le );
le->reset();
return true;
}
} cmdResetError;
/* set by replica sets if specified in the configuration.
a pointer is used to avoid any possible locking issues with lockless reading (see below locktype() is NONE
and would like to keep that)
(for now, it simply orphans any old copy as config changes should be extremely rare).
note: once non-null, never goes to null again.
*/
BSONObj *getLastErrorDefault = 0;
class CmdGetLastError : public Command {
public:
CmdGetLastError() : Command("getLastError", false, "getlasterror") { }
virtual LockType locktype() const { return NONE; }
virtual bool logTheOp() { return false; }
virtual bool slaveOk() const { return true; }
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
virtual void help( stringstream& help ) const {
help << "return error status of the last operation on this connection\n"
<< "options:\n"
<< " { fsync:true } - fsync before returning, or wait for journal commit if running with --journal\n"
<< " { j:true } - wait for journal commit if running with --journal\n"
<< " { w:n } - await replication to n servers (including self) before returning\n"
<< " { w:'majority' } - await replication to majority of set\n"
<< " { wtimeout:m} - timeout for w in m milliseconds";
}
bool run(const string& dbname, BSONObj& _cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
LastError *le = lastError.disableForCommand();
if ( le->nPrev != 1 ) {
LastError::noError.appendSelf( result , false );
le->appendSelfStatus( result );
}
else {
le->appendSelf( result , false );
}
Client& c = cc();
c.appendLastOp( result );
result.appendNumber( "connectionId" , c.getConnectionId() ); // for sharding; also useful in general for debugging
BSONObj cmdObj = _cmdObj;
{
BSONObj::iterator i(_cmdObj);
i.next();
if( !i.more() ) {
/* empty, use default */
BSONObj *def = getLastErrorDefault;
if( def )
cmdObj = *def;
}
}
WriteConcernOptions writeConcern;
Status s = writeConcern.parse( cmdObj );
if ( !s.isOK() ) {
result.append( "badGLE", cmdObj );
errmsg = s.toString();
return false;
}
WriteConcernResult res;
s = waitForWriteConcern( cc(), writeConcern, &res );
res.appendTo( &result );
if ( !s.isOK() ) {
errmsg = s.toString();
return false;
}
return true;
}
} cmdGetLastError;
class CmdGetPrevError : public Command {
public:
virtual LockType locktype() const { return NONE; }
virtual bool logTheOp() {
return false;
}
virtual void help( stringstream& help ) const {
help << "check for errors since last reseterror commandcal";
}
virtual bool slaveOk() const {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {} // No auth required
CmdGetPrevError() : Command("getPrevError", false, "getpreverror") {}
bool run(const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
LastError *le = lastError.disableForCommand();
le->appendSelf( result );
if ( le->valid )
result.append( "nPrev", le->nPrev );
else
result.append( "nPrev", -1 );
return true;
}
} cmdGetPrevError;
}
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