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// @file d_logic.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/>.
*/
/**
these are commands that live in mongod
mostly around shard management and checking
*/
#include "pch.h"
#include <map>
#include <string>
#include "../db/commands.h"
#include "../db/jsobj.h"
#include "../db/dbmessage.h"
#include "../client/connpool.h"
#include "../util/queue.h"
#include "shard.h"
#include "d_logic.h"
#include "d_writeback.h"
using namespace std;
namespace mongo {
bool _handlePossibleShardedMessage( Message &m, DbResponse* dbresponse ) {
DEV verify( shardingState.enabled() );
int op = m.operation();
if ( op < 2000
|| op >= 3000
|| op == dbGetMore // cursors are weird
)
return false;
DbMessage d(m);
const char *ns = d.getns();
string errmsg;
// We don't care about the version here, since we're returning it later in the writeback
ConfigVersion received, wanted;
if ( shardVersionOk( ns , errmsg, received, wanted ) ) {
return false;
}
bool getsAResponse = doesOpGetAResponse( op );
LOG(1) << "connection sharding metadata does not match for collection " << ns
<< ", will retry (wanted : " << wanted << ", received : " << received << ")"
<< ( getsAResponse ? "" : " (queuing writeback)" ) << endl;
if( getsAResponse ){
verify( dbresponse );
BufBuilder b( 32768 );
b.skip( sizeof( QueryResult ) );
{
BSONObjBuilder bob;
bob.append( "$err", errmsg );
bob.append( "ns", ns );
wanted.addToBSON( bob, "vWanted" );
received.addToBSON( bob, "vReceived" );
BSONObj obj = bob.obj();
b.appendBuf( obj.objdata() , obj.objsize() );
}
QueryResult *qr = (QueryResult*)b.buf();
qr->_resultFlags() = ResultFlag_ErrSet | ResultFlag_ShardConfigStale;
qr->len = b.len();
qr->setOperation( opReply );
qr->cursorId = 0;
qr->startingFrom = 0;
qr->nReturned = 1;
b.decouple();
Message * resp = new Message();
resp->setData( qr , true );
dbresponse->response = resp;
dbresponse->responseTo = m.header()->id;
return true;
}
uassert( 9517 , "writeback" , ( d.reservedField() & Reserved_FromWriteback ) == 0 );
OID writebackID;
writebackID.initSequential();
const OID& clientID = ShardedConnectionInfo::get(false)->getID();
massert( 10422 , "write with bad shard config and no server id!" , clientID.isSet() );
// We need to check this here, since otherwise we'll get errors wrapping the writeback -
// not just here, but also when returning as a command result.
// We choose 1/2 the overhead of the internal maximum so that we can still handle ops of
// 16MB exactly.
massert( 16437, "data size of operation is too large to queue for writeback",
m.dataSize() < BSONObjMaxInternalSize - (8 * 1024));
LOG(1) << "writeback queued for " << m.toString() << endl;
BSONObjBuilder b;
b.appendBool( "writeBack" , true );
b.append( "ns" , ns );
b.append( "id" , writebackID );
b.append( "connectionId" , cc().getConnectionId() );
b.append( "instanceIdent" , prettyHostName() );
wanted.addToBSON( b );
received.addToBSON( b, "yourVersion" );
b.appendBinData( "msg" , m.header()->len , bdtCustom , (char*)(m.singleData()) );
LOG(2) << "writing back msg with len: " << m.header()->len << " op: " << m.operation() << endl;
// Convert to new BSONObj here just to be safe
BSONObj wbObj = b.obj();
// Don't register the writeback until immediately before we queue it -
// after this line, mongos will wait for an hour if we don't queue correctly
lastError.getSafe()->writeback( writebackID );
writeBackManager.queueWriteBack( clientID.str() , wbObj );
return true;
}
}
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