BSONObj SyncClusterConnection::findOne(const string &ns, Query query, const BSONObj *fieldsToReturn, int queryOptions) {
if ( ns.find( ".$cmd" ) != string::npos ){
string cmdName = query.obj.firstElement().fieldName();
int lockType = _lockType( cmdName );
if ( lockType > 0 ){ // write $cmd
string errmsg;
if ( ! prepare( errmsg ) )
throw UserException( 13104 , (string)"SyncClusterConnection::insert prepare failed: " + errmsg );
vector<BSONObj> all;
for ( size_t i=0; i<_conns.size(); i++ ){
all.push_back( _conns[i]->findOne( ns , query , 0 , queryOptions ).getOwned() );
}
_checkLast();
for ( size_t i=0; i<all.size(); i++ ){
BSONObj temp = all[i];
if ( isOk( temp ) )
continue;
stringstream ss;
ss << "write $cmd failed on a shard: " << temp.jsonString();
ss << " " << _conns[i]->toString();
throw UserException( 13105 , ss.str() );
}
return all[0];
}
}
return DBClientBase::findOne( ns , query , fieldsToReturn , queryOptions );
}
auto_ptr<DBClientCursor> SyncClusterConnection::query(const string &ns, Query query, int nToReturn, int nToSkip,
const BSONObj *fieldsToReturn, int queryOptions, int batchSize ) {
_lastErrors.clear();
if ( ns.find( ".$cmd" ) != string::npos ) {
string cmdName = query.obj.firstElementFieldName();
int lockType = _lockType( cmdName );
uassert( 13054 , (string)"write $cmd not supported in SyncClusterConnection::query for:" + cmdName , lockType <= 0 );
}
return _queryOnActive( ns , query , nToReturn , nToSkip , fieldsToReturn , queryOptions , batchSize );
}