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107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/* dbgrid/request.cpp
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Top level handling of requests (operations such as query, insert, ...)
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*/
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "stdafx.h"
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#include "server.h"
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#include "../db/commands.h"
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#include "../db/dbmessage.h"
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#include "../client/connpool.h"
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#include "request.h"
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#include "config.h"
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#include "shard.h"
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namespace mongo {
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Request::Request( Message& m, AbstractMessagingPort* p ) : _m(m) , _d( m ) , _p(p){
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assert( _d.getns() );
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_id = _m.data->id;
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_config = grid.getDBConfig( getns() );
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if ( _config->sharded( getns() ) ){
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_shardInfo = _config->getShardManager( getns() );
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uassert( (string)"no shard info for: " + getns() , _shardInfo );
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}
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else {
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_shardInfo = 0;
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}
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}
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string Request::singleServerName(){
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if ( _shardInfo ){
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if ( _shardInfo->numShards() > 1 )
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throw UserException( "can't call singleServerName on a sharded collection" );
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return _shardInfo->findShard( _shardInfo->getShardKey().globalMin() ).getServer();
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}
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string s = _config->getServer( getns() );
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uassert( "can't call singleServerName on a sharded collection!" , s.size() > 0 );
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return s;
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}
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void Request::process(){
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int op = _m.data->operation();
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assert( op > dbMsg );
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Strategy * s = SINGLE;
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if ( getConfig()->isPartitioned() && op == dbQuery ){
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// there are a few things we need to check here
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// 1. db.eval
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// TODO: right now i'm just going to block all
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// will need to make it look at function later
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// 2. $where - can't access DB
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// TODO: make it smarter
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QueryMessage q( _d );
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BSONObj query = q.query;
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if ( q.ntoreturn == 1 &&
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strstr( q.ns , ".$cmd" ) &&
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strcmp( "$eval" , query.firstElement().fieldName() ) == 0 ){
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log() << "trying to eval: " << q.query << endl;
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throw UserException( "eval not supported on partitioned databases yet" );
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}
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if ( query.hasField( "$where" ) )
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throw UserException( "$where not supported for partitioned databases yet" );
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_d.resetPull();
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}
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if ( _shardInfo ){
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if ( _shardInfo->numShards() > 1 )
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s = SHARDED;
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}
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if ( op == dbQuery ) {
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s->queryOp( *this );
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}
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else if ( op == dbGetMore ) {
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s->getMore( *this );
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}
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else {
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s->writeOp( op, *this );
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}
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}
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} // namespace mongo
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