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// strategy_simple.cpp
#include "stdafx.h"
#include "request.h"
#include "../client/connpool.h"
#include "../db/commands.h"
namespace mongo {
class SingleStrategy : public Strategy {
public:
SingleStrategy(){
_commandsSafeToPass.insert( "$eval" );
_commandsSafeToPass.insert( "create" );
}
private:
virtual void queryOp( Request& r ){
QueryMessage q( r.d() );
bool lateAssert = false;
log(3) << "single query: " << q.ns << " " << q.query << " ntoreturn: " << q.ntoreturn << endl;
try {
if ( ( q.ntoreturn == -1 || q.ntoreturn == 1 ) && strstr(q.ns, ".$cmd") ) {
BSONObjBuilder builder;
bool ok = Command::runAgainstRegistered(q.ns, q.query, builder);
if ( ok ) {
BSONObj x = builder.done();
replyToQuery(0, r.p(), r.m(), x);
return;
}
string commandName = q.query.firstElement().fieldName();
if ( ! _commandsSafeToPass.count( commandName ) )
log() << "passing through unknown command: " << commandName << " " << q.query << endl;
}
lateAssert = true;
doQuery( r , r.singleServerName() );
}
catch ( AssertionException& e ) {
assert( !lateAssert );
BSONObjBuilder err;
err.append("$err", string("mongos: ") + (e.msg.empty() ? "assertion during query" : e.msg));
BSONObj errObj = err.done();
replyToQuery(QueryResult::ResultFlag_ErrSet, r.p() , r.m() , errObj);
return;
}
}
virtual void getMore( Request& r ){
const char *ns = r.getns();
log(3) << "single getmore: " << ns << endl;
ScopedDbConnection dbcon( r.singleServerName() );
DBClientBase& _c = dbcon.conn();
// TODO
DBClientConnection &c = dynamic_cast<DBClientConnection&>(_c);
Message response;
bool ok = c.port().call( r.m() , response);
uassert( 10204 , "dbgrid: getmore: error calling db", ok);
r.reply( response );
dbcon.done();
}
void handleIndexWrite( int op , Request& r ){
DbMessage& d = r.d();
if ( op == dbInsert ){
while( d.moreJSObjs() ){
BSONObj o = d.nextJsObj();
const char * ns = o["ns"].valuestr();
if ( r.getConfig()->isSharded( ns ) ){
uassert( 10205 , (string)"can't use unique indexes with sharding ns:" + ns +
" key: " + o["key"].embeddedObjectUserCheck().toString() ,
IndexDetails::isIdIndexPattern( o["key"].embeddedObjectUserCheck() ) ||
! o["unique"].trueValue() );
ChunkManager * cm = r.getConfig()->getChunkManager( ns );
assert( cm );
for ( int i=0; i<cm->numChunks();i++)
doWrite( op , r , cm->getChunk(i)->getShard() );
}
else {
doWrite( op , r , r.singleServerName() );
}
}
}
else if ( op == dbUpdate ){
throw UserException( 8050 , "can't update system.indexes" );
}
else if ( op == dbDelete ){
// TODO
throw UserException( 8051 , "can't delete indexes on sharded collection yet" );
}
else {
log() << "handleIndexWrite invalid write op: " << op << endl;
throw UserException( 8052 , "handleIndexWrite invalid write op" );
}
}
virtual void writeOp( int op , Request& r ){
const char *ns = r.getns();
if ( r.isShardingEnabled() &&
strstr( ns , ".system.indexes" ) == strstr( ns , "." ) &&
strstr( ns , "." ) ){
log(1) << " .system.indexes write for: " << ns << endl;
handleIndexWrite( op , r );
return;
}
log(3) << "single write: " << ns << endl;
doWrite( op , r , r.singleServerName() );
}
set<string> _commandsSafeToPass;
};
Strategy * SINGLE = new SingleStrategy();
}
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