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// s/request.cpp
/**
* 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/>.
*/
#include "pch.h"
#include "server.h"
#include "../db/commands.h"
#include "../db/dbmessage.h"
#include "../db/stats/counters.h"
#include "../client/connpool.h"
#include "request.h"
#include "config.h"
#include "chunk.h"
#include "stats.h"
#include "cursors.h"
#include "grid.h"
#include "client.h"
namespace mongo {
Request::Request( Message& m, AbstractMessagingPort* p ) :
_m(m) , _d( m ) , _p(p) , _didInit(false) {
assert( _d.getns() );
_id = _m.header()->id;
_clientId = p ? p->getClientId() : 0;
_clientInfo = ClientInfo::get( _clientId );
_clientInfo->newRequest( p );
}
void Request::init() {
if ( _didInit )
return;
_didInit = true;
reset();
}
void Request::reset( bool reload ) {
if ( _m.operation() == dbKillCursors ) {
return;
}
uassert( 13644 , "can't use 'local' database through mongos" , ! str::startsWith( getns() , "local." ) );
_config = grid.getDBConfig( getns() );
if ( reload )
uassert( 10192 , "db config reload failed!" , _config->reload() );
if ( _config->isSharded( getns() ) ) {
_chunkManager = _config->getChunkManager( getns() , reload );
uassert( 10193 , (string)"no shard info for: " + getns() , _chunkManager );
}
else {
_chunkManager.reset();
}
_m.header()->id = _id;
}
Shard Request::primaryShard() const {
assert( _didInit );
if ( _chunkManager ) {
if ( _chunkManager->numChunks() > 1 )
throw UserException( 8060 , "can't call primaryShard on a sharded collection" );
return _chunkManager->findChunk( _chunkManager->getShardKey().globalMin() )->getShard();
}
Shard s = _config->getShard( getns() );
uassert( 10194 , "can't call primaryShard on a sharded collection!" , s.ok() );
return s;
}
void Request::process( int attempt ) {
init();
int op = _m.operation();
assert( op > dbMsg );
if ( op == dbKillCursors ) {
cursorCache.gotKillCursors( _m );
return;
}
log(3) << "Request::process ns: " << getns() << " msg id:" << (int)(_m.header()->id) << " attempt: " << attempt << endl;
Strategy * s = SINGLE;
_counter = &opsNonSharded;
_d.markSet();
if ( _chunkManager ) {
s = SHARDED;
_counter = &opsSharded;
}
bool iscmd = false;
if ( op == dbQuery ) {
iscmd = isCommand();
try {
s->queryOp( *this );
}
catch ( StaleConfigException& staleConfig ) {
log() << staleConfig.what() << " attempt: " << attempt << endl;
uassert( 10195 , "too many attempts to update config, failing" , attempt < 5 );
ShardConnection::checkMyConnectionVersions( getns() );
if (!staleConfig.justConnection() )
sleepsecs( attempt );
reset( ! staleConfig.justConnection() );
_d.markReset();
process( attempt + 1 );
return;
}
}
else if ( op == dbGetMore ) {
s->getMore( *this );
}
else {
s->writeOp( op, *this );
}
globalOpCounters.gotOp( op , iscmd );
_counter->gotOp( op , iscmd );
}
bool Request::isCommand() const {
int x = _d.getQueryNToReturn();
return ( x == 1 || x == -1 ) && strstr( getns() , ".$cmd" );
}
void Request::gotInsert() {
globalOpCounters.gotInsert();
_counter->gotInsert();
}
void Request::reply( Message & response , const string& fromServer ) {
assert( _didInit );
long long cursor =response.header()->getCursor();
if ( cursor ) {
if ( fromServer.size() ) {
cursorCache.storeRef( fromServer , cursor );
}
else {
// probably a getMore
// make sure we have a ref for this
assert( cursorCache.getRef( cursor ).size() );
}
}
_p->reply( _m , response , _id );
}
} // namespace mongo
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