path: root/scripting/sm_db.cpp

// sm_db.cpp

/*    Copyright 2009 10gen Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

// hacked in right now from engine_spidermonkey.cpp

#include "../client/syncclusterconnection.h"
#include "../util/base64.h"

namespace mongo {

    bool haveLocalShardingInfo( const string& ns );

    // ------------    some defs needed ---------------
    
    JSObject * doCreateCollection( JSContext * cx , JSObject * db , const string& shortName );
        
    // ------------     utils          ------------------
         

    bool isSpecialName( const string& name ){
        static set<string> names;
        if ( names.size() == 0 ){
            names.insert( "tojson" );
            names.insert( "toJson" );
            names.insert( "toString" );
        }

        if ( name.length() == 0 )
            return false;
        
        if ( name[0] == '_' )
            return true;
        
        return names.count( name ) > 0;
    }


    // ------ cursor ------

    class CursorHolder {
    public:
        CursorHolder( auto_ptr< DBClientCursor > &cursor, const shared_ptr< DBClientWithCommands > &connection ) :
        connection_( connection ),
        cursor_( cursor ) {
            assert( cursor_.get() );
        }
        DBClientCursor *get() const { return cursor_.get(); }
    private:
        shared_ptr< DBClientWithCommands > connection_;
        auto_ptr< DBClientCursor > cursor_;
    };
    
    DBClientCursor *getCursor( JSContext *cx, JSObject *obj ) {
        CursorHolder * holder = (CursorHolder*)JS_GetPrivate( cx , obj );
        uassert( 10235 ,  "no cursor!" , holder );
        return holder->get();
    }
    
    JSBool internal_cursor_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        uassert( 10236 ,  "no args to internal_cursor_constructor" , argc == 0 );
        assert( JS_SetPrivate( cx , obj , 0 ) ); // just for safety
        return JS_TRUE;
    }

    void internal_cursor_finalize( JSContext * cx , JSObject * obj ){
        CursorHolder * holder = (CursorHolder*)JS_GetPrivate( cx , obj );
        if ( holder ){
            delete holder;
            assert( JS_SetPrivate( cx , obj , 0 ) );
        }
    }

    JSBool internal_cursor_hasNext(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){
        DBClientCursor *cursor = getCursor( cx, obj );
        *rval = cursor->more() ? JSVAL_TRUE : JSVAL_FALSE;
        return JS_TRUE;
    }

    JSBool internal_cursor_next(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){
        DBClientCursor *cursor = getCursor( cx, obj );
        if ( ! cursor->more() ){
            JS_ReportError( cx , "cursor at the end" );
            return JS_FALSE;
        }
        Convertor c(cx);

        BSONObj n = cursor->next();
        *rval = c.toval( &n );
        return JS_TRUE;
    }

    JSFunctionSpec internal_cursor_functions[] = {
        { "hasNext" , internal_cursor_hasNext , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { "next" , internal_cursor_next , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { 0 }
    };

    JSClass internal_cursor_class = {
        "InternalCursor" , JSCLASS_HAS_PRIVATE  ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, internal_cursor_finalize,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };

    
    // ------ mongo stuff ------

    JSBool mongo_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        uassert( 10237 ,  "mongo_constructor not implemented yet" , 0 );
        throw -1;
    }
    
    JSBool mongo_local_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );

        shared_ptr< DBClientWithCommands > client( createDirectClient() );
        assert( JS_SetPrivate( cx , obj , (void*)( new shared_ptr< DBClientWithCommands >( client ) ) ) );

        jsval host = c.toval( "EMBEDDED" );
        assert( JS_SetProperty( cx , obj , "host" , &host ) );

        return JS_TRUE;
    }

    JSBool mongo_external_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );
        
        uassert( 10238 ,  "0 or 1 args to Mongo" , argc <= 1 );
        
        string host = "127.0.0.1";
        if ( argc > 0 )
            host = c.toString( argv[0] );
        
        int numCommas = DBClientBase::countCommas( host );

        shared_ptr< DBClientWithCommands > conn;
        
        string errmsg;
        if ( numCommas == 0 ){
            DBClientConnection * c = new DBClientConnection( true );
            conn.reset( c );
            if ( ! c->connect( host , errmsg ) ){
                JS_ReportError( cx , ((string)"couldn't connect: " + errmsg).c_str() );
                return JS_FALSE;
            }
            ScriptEngine::runConnectCallback( *c );
        }
        else if ( numCommas == 1 ){ // paired
            DBClientPaired * c = new DBClientPaired();
            conn.reset( c );
            if ( ! c->connect( host ) ){
                JS_ReportError( cx , "couldn't connect to pair" );
                    return JS_FALSE;
            }
        }
        else if ( numCommas == 2 ){
            conn.reset( new SyncClusterConnection( host ) );
        }
        else {
            JS_ReportError( cx , "1 (paired) or 2(quorum) commas are allowed" );
            return JS_FALSE;
        }
        
        
        assert( JS_SetPrivate( cx , obj , (void*)( new shared_ptr< DBClientWithCommands >( conn ) ) ) );
        jsval host_val = c.toval( host.c_str() );
        assert( JS_SetProperty( cx , obj , "host" , &host_val ) );
        return JS_TRUE;

    }

    DBClientWithCommands *getConnection( JSContext *cx, JSObject *obj ) {
        shared_ptr< DBClientWithCommands > * connHolder = (shared_ptr< DBClientWithCommands >*)JS_GetPrivate( cx , obj );
        uassert( 10239 ,  "no connection!" , connHolder && connHolder->get() );
        return connHolder->get();
    }
    
    void mongo_finalize( JSContext * cx , JSObject * obj ){
        shared_ptr< DBClientWithCommands > * connHolder = (shared_ptr< DBClientWithCommands >*)JS_GetPrivate( cx , obj );
        if ( connHolder ){
            delete connHolder;
            assert( JS_SetPrivate( cx , obj , 0 ) );
        }
    }

    JSClass mongo_class = {
        "Mongo" , JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, mongo_finalize,
        JSCLASS_NO_OPTIONAL_MEMBERS
     };

    JSBool mongo_find(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){
        uassert( 10240 ,  "mongo_find neesd 6 args" , argc == 6 );
        shared_ptr< DBClientWithCommands > * connHolder = (shared_ptr< DBClientWithCommands >*)JS_GetPrivate( cx , obj );
        uassert( 10241 ,  "no connection!" , connHolder && connHolder->get() );
        DBClientWithCommands *conn = connHolder->get();
                      
        Convertor c( cx );

        string ns = c.toString( argv[0] );
        
        BSONObj q = c.toObject( argv[1] );
        BSONObj f = c.toObject( argv[2] );
        
        int nToReturn = (int) c.toNumber( argv[3] );
        int nToSkip = (int) c.toNumber( argv[4] );
        bool slaveOk = c.getBoolean( obj , "slaveOk" );
        int batchSize = (int) c.toNumber( argv[5] );

        try {

            auto_ptr<DBClientCursor> cursor = conn->query( ns , q , nToReturn , nToSkip , f.nFields() ? &f : 0  , slaveOk ? QueryOption_SlaveOk : 0 , batchSize );
            if ( ! cursor.get() ){
                log() << "query failed : " << ns << " " << q << " to: " << conn->toString() << endl;
                JS_ReportError( cx , "error doing query: failed" );
                return JS_FALSE;
            }
            JSObject * mycursor = JS_NewObject( cx , &internal_cursor_class , 0 , 0 );
            CHECKNEWOBJECT( mycursor, cx, "internal_cursor_class" );
            assert( JS_SetPrivate( cx , mycursor , new CursorHolder( cursor, *connHolder ) ) );
            *rval = OBJECT_TO_JSVAL( mycursor );
            return JS_TRUE;
        }
        catch ( ... ){
            JS_ReportError( cx , "error doing query: unknown" );
            return JS_FALSE;
        }
    }

    JSBool mongo_update(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){
        smuassert( cx ,  "mongo_find needs at elast 3 args" , argc >= 3 );
        smuassert( cx ,  "2nd param to update has to be an object" , JSVAL_IS_OBJECT( argv[1] ) );
        smuassert( cx ,  "3rd param to update has to be an object" , JSVAL_IS_OBJECT( argv[2] ) );

        Convertor c( cx );
        if ( c.getBoolean( obj , "readOnly" ) ){
            JS_ReportError( cx , "js db in read only mode - mongo_update" );
            return JS_FALSE;
        }

        DBClientWithCommands * conn = getConnection( cx, obj );
        uassert( 10245 ,  "no connection!" , conn );

        string ns = c.toString( argv[0] );

        bool upsert = argc > 3 && c.toBoolean( argv[3] );
        bool multi = argc > 4 && c.toBoolean( argv[4] );

        try {
            conn->update( ns , c.toObject( argv[1] ) , c.toObject( argv[2] ) , upsert , multi );
            return JS_TRUE;
        }
        catch ( ... ){
            JS_ReportError( cx , "error doing update" );
            return JS_FALSE;
        }
    }

    JSBool mongo_insert(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        smuassert( cx ,  "mongo_insert needs 2 args" , argc == 2 );
        smuassert( cx ,  "2nd param to insert has to be an object" , JSVAL_IS_OBJECT( argv[1] ) );

        Convertor c( cx );
        if ( c.getBoolean( obj , "readOnly" ) ){
            JS_ReportError( cx , "js db in read only mode - mongo_insert" );
            return JS_FALSE;
        }
        
        DBClientWithCommands * conn = getConnection( cx, obj );
        uassert( 10248 ,  "no connection!" , conn );
        
        
        string ns = c.toString( argv[0] );
        BSONObj o = c.toObject( argv[1] );

        // TODO: add _id
        
        try {
            conn->insert( ns , o );
            return JS_TRUE;
        }
        catch ( std::exception& e ){
            stringstream ss;
            ss << "error doing insert:" << e.what();
            string s = ss.str();
            JS_ReportError( cx , s.c_str() );
            return JS_FALSE;
        }
        catch ( ... ){
            JS_ReportError( cx , "error doing insert" );
            return JS_FALSE;
        }
    }

    JSBool mongo_remove(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        smuassert( cx ,  "mongo_remove needs 2 arguments" , argc == 2 );
        smuassert( cx ,  "2nd param to insert has to be an object" , JSVAL_IS_OBJECT( argv[1] ) );

        Convertor c( cx );
        if ( c.getBoolean( obj , "readOnly" ) ){
            JS_ReportError( cx , "js db in read only mode - mongo_remove" );
            return JS_FALSE;
        }

        DBClientWithCommands * conn = getConnection( cx, obj );
        uassert( 10251 ,  "no connection!" , conn );
        
        string ns = c.toString( argv[0] );
        BSONObj o = c.toObject( argv[1] );

        try {
            conn->remove( ns , o );
            return JS_TRUE;
        }
        catch ( ... ){
            JS_ReportError( cx , "error doing remove" );
            return JS_FALSE;
        }
        
    }

    JSFunctionSpec mongo_functions[] = {
        { "find" , mongo_find , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { "update" , mongo_update , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { "insert" , mongo_insert , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { "remove" , mongo_remove , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { 0 }
    };


     // -------------  db_collection -------------

     JSBool db_collection_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){    
         smuassert( cx ,  "db_collection_constructor wrong args" , argc == 4 );
         assert( JS_SetProperty( cx , obj , "_mongo" , &(argv[0]) ) );
         assert( JS_SetProperty( cx , obj , "_db" , &(argv[1]) ) );
         assert( JS_SetProperty( cx , obj , "_shortName" , &(argv[2]) ) );
         assert( JS_SetProperty( cx , obj , "_fullName" , &(argv[3]) ) );
         
         Convertor c(cx);
         if ( haveLocalShardingInfo( c.toString( argv[3] ) ) ){
             JS_ReportError( cx , "can't use sharded collection from db.eval" );
             return JS_FALSE;
         }
         
         return JS_TRUE;
     }

     JSBool db_collection_resolve( JSContext *cx, JSObject *obj, jsval id, uintN flags, JSObject **objp ){
         if ( flags & JSRESOLVE_ASSIGNING )
             return JS_TRUE;
         
         Convertor c( cx );
         string collname = c.toString( id );

         if ( isSpecialName( collname ) )
             return JS_TRUE;
         
         if ( obj == c.getGlobalPrototype( "DBCollection" ) )
             return JS_TRUE;
         
         JSObject * proto = JS_GetPrototype( cx , obj );
         if ( c.hasProperty( obj , collname.c_str() ) || ( proto && c.hasProperty( proto , collname.c_str() )  ) )
             return JS_TRUE;
         
         string name = c.toString( c.getProperty( obj , "_shortName" ) );
         name += ".";
         name += collname;
         
         jsval db = c.getProperty( obj , "_db" );
         if ( ! JSVAL_IS_OBJECT( db ) )
             return JS_TRUE;

         JSObject * coll = doCreateCollection( cx , JSVAL_TO_OBJECT( db ) , name );
         if ( ! coll )
             return JS_FALSE;
         c.setProperty( obj , collname.c_str() , OBJECT_TO_JSVAL( coll ) );
         *objp = obj;
         return JS_TRUE;
     }

    JSClass db_collection_class = {
         "DBCollection" , JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE , 
         JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
         JS_EnumerateStub, (JSResolveOp)(&db_collection_resolve) , JS_ConvertStub, JS_FinalizeStub,
         JSCLASS_NO_OPTIONAL_MEMBERS
     };


     JSObject * doCreateCollection( JSContext * cx , JSObject * db , const string& shortName ){
         Convertor c(cx);
         
         assert( c.hasProperty( db , "_mongo" ) );
         assert( c.hasProperty( db , "_name" ) );
         
         JSObject * coll = JS_NewObject( cx , &db_collection_class , 0 , 0 );
         CHECKNEWOBJECT( coll, cx, "doCreateCollection" );
         c.setProperty( coll , "_mongo" , c.getProperty( db , "_mongo" ) );
         c.setProperty( coll , "_db" , OBJECT_TO_JSVAL( db ) );
         c.setProperty( coll , "_shortName" , c.toval( shortName.c_str() ) );
         
         string name = c.toString( c.getProperty( db , "_name" ) );
         name += "." + shortName;
         c.setProperty( coll , "_fullName" , c.toval( name.c_str() ) );
         
         if ( haveLocalShardingInfo( name ) ){
             JS_ReportError( cx , "can't use sharded collection from db.eval" );
             return 0;
         }

         return coll;
    }
    
    // --------------  DB ---------------
    
    
    JSBool db_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        smuassert( cx,  "wrong number of arguments to DB" , argc == 2 );
        assert( JS_SetProperty( cx , obj , "_mongo" , &(argv[0]) ) );
        assert( JS_SetProperty( cx , obj , "_name" , &(argv[1]) ) );

        return JS_TRUE;
    }

    JSBool db_resolve( JSContext *cx, JSObject *obj, jsval id, uintN flags, JSObject **objp ){
        if ( flags & JSRESOLVE_ASSIGNING )
            return JS_TRUE;

        Convertor c( cx );

        if ( obj == c.getGlobalPrototype( "DB" ) )
            return JS_TRUE;

        string collname = c.toString( id );
        
        if ( isSpecialName( collname ) )
             return JS_TRUE;

        JSObject * proto = JS_GetPrototype( cx , obj );
        if ( proto && c.hasProperty( proto , collname.c_str() ) )
            return JS_TRUE;

        JSObject * coll = doCreateCollection( cx , obj , collname );
        if ( ! coll )
            return JS_FALSE;
        c.setProperty( obj , collname.c_str() , OBJECT_TO_JSVAL( coll ) );
        
        *objp = obj;
        return JS_TRUE;
    }

    JSClass db_class = {
        "DB" , JSCLASS_HAS_PRIVATE | JSCLASS_NEW_RESOLVE , 
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, (JSResolveOp)(&db_resolve) , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    

    // -------------- object id -------------

    JSBool object_id_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );

        OID oid;
        if ( argc == 0 ){
            oid.init();
        }
        else {
            smuassert( cx ,  "object_id_constructor can't take more than 1 param" , argc == 1 );
            string s = c.toString( argv[0] );

            try {
                Scope::validateObjectIdString( s );
            } catch ( const MsgAssertionException &m ) {
                static string error = m.toString();
                JS_ReportError( cx, error.c_str() );
                return JS_FALSE;
            }
            oid.init( s );
        }
        
        if ( ! JS_InstanceOf( cx , obj , &object_id_class , 0 ) ){
            obj = JS_NewObject( cx , &object_id_class , 0 , 0 );
            CHECKNEWOBJECT( obj, cx, "object_id_constructor" );
            *rval = OBJECT_TO_JSVAL( obj );
        }
        
        jsval v = c.toval( oid.str().c_str() );
        assert( JS_SetProperty( cx , obj , "str" , &v  ) );

        return JS_TRUE;
    }
    
    JSClass object_id_class = {
        "ObjectId" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };

    JSBool object_id_tostring(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        Convertor c(cx);
        return *rval = c.getProperty( obj , "str" );
    }

    JSFunctionSpec object_id_functions[] = {
        { "toString" , object_id_tostring , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { 0 }
    };


    // dbpointer

    JSBool dbpointer_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );
                
        if ( argc == 2 ){

            if ( ! JSVAL_IS_OID( argv[1] ) ){
                JS_ReportError( cx , "2nd arg to DBPointer needs to be oid" );
                return JS_FALSE;            
            }
            
            assert( JS_SetProperty( cx , obj , "ns" , &(argv[0]) ) );
            assert( JS_SetProperty( cx , obj , "id" , &(argv[1]) ) );
            return JS_TRUE;
        }
        else {
            JS_ReportError( cx , "DBPointer needs 2 arguments" );
            return JS_FALSE;            
        }
    }
 
    JSClass dbpointer_class = {
        "DBPointer" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };

    JSFunctionSpec dbpointer_functions[] = {
        { 0 }
    };


    JSBool dbref_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );

        if ( argc == 2 ){
            JSObject * o = JS_NewObject( cx , NULL , NULL, NULL );
            CHECKNEWOBJECT( o, cx, "dbref_constructor" );
            assert( JS_SetProperty( cx, o , "$ref" , &argv[ 0 ] ) );
            assert( JS_SetProperty( cx, o , "$id" , &argv[ 1 ] ) );
            BSONObj bo = c.toObject( o );
            assert( JS_SetPrivate( cx , obj , (void*)(new BSONHolder( bo.getOwned() ) ) ) );
            return JS_TRUE;
        }
        else {
            JS_ReportError( cx , "DBRef needs 2 arguments" );
            assert( JS_SetPrivate( cx , obj , (void*)(new BSONHolder( BSONObj().getOwned() ) ) ) );
            return JS_FALSE;            
        }
    }
 
    JSClass dbref_class = bson_class; // name will be fixed later

    // BinData


    JSBool bindata_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        Convertor c( cx );
        
        if ( argc == 2 ){

            int type = (int)c.toNumber( argv[ 0 ] );
            string encoded = c.toString( argv[ 1 ] );
            string decoded = base64::decode( encoded );

            assert( JS_SetPrivate( cx, obj, new BinDataHolder( decoded.data(), decoded.length() ) ) );
            c.setProperty( obj, "len", c.toval( decoded.length() ) );
            c.setProperty( obj, "type", c.toval( type ) );

            return JS_TRUE;
        }
        else {
            JS_ReportError( cx , "BinData needs 2 arguments" );
            return JS_FALSE;            
        }
    }
 
    JSBool bindata_tostring(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        Convertor c(cx);
        int type = (int)c.getNumber( obj , "type" );
        int len = (int)c.getNumber( obj, "len" );
        void *holder = JS_GetPrivate( cx, obj );
        assert( holder );
        const char *data = ( ( BinDataHolder* )( holder ) )->c_;
        stringstream ss;
        ss << "BinData( type: " << type << ", base64: \"";
        base64::encode( ss, (const char *)data, len );
        ss << "\" )";
        string ret = ss.str();
        return *rval = c.toval( ret.c_str() );
    }

    void bindata_finalize( JSContext * cx , JSObject * obj ){
        Convertor c(cx);
        void *holder = JS_GetPrivate( cx, obj );
        if ( holder ){
            delete ( BinDataHolder* )holder;
            assert( JS_SetPrivate( cx , obj , 0 ) );
        }
    }    
    
    JSClass bindata_class = {
        "BinData" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, bindata_finalize,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };

    JSFunctionSpec bindata_functions[] = {
        { "toString" , bindata_tostring , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
        { 0 }
    };
    
    // Map

    bool specialMapString( const string& s ){
        return s == "put" || s == "get" || s == "_get" || s == "values" || s == "_data" || s == "constructor" ;
    }

    JSBool map_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        if ( argc > 0 ){
            JS_ReportError( cx , "Map takes no arguments" );
            return JS_FALSE;
        }

        JSObject * array = JS_NewObject( cx , 0 , 0 , 0 );
        CHECKNEWOBJECT( array, cx, "map_constructor" );

        jsval a = OBJECT_TO_JSVAL( array );
        JS_SetProperty( cx , obj , "_data" , &a );

        return JS_TRUE;
    }
 
    JSBool map_prop( JSContext *cx, JSObject *obj, jsval idval, jsval *vp ){
        Convertor c(cx);
        if ( specialMapString( c.toString( idval ) ) )
            return JS_TRUE;
        
        log() << "illegal prop access: " << c.toString( idval ) << endl;
        JS_ReportError( cx , "can't use array access with Map" );
        return JS_FALSE;
    }
    
    JSClass map_class = {
        "Map" , JSCLASS_HAS_PRIVATE ,
        map_prop, JS_PropertyStub, map_prop, map_prop,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    
    JSFunctionSpec map_functions[] = {
        { 0 }
    };
    

    // -----

    JSClass timestamp_class = {
        "Timestamp" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    
    JSClass numberlong_class = {
        "NumberLong" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    
    JSBool numberlong_valueof(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        Convertor c(cx);
        return *rval = c.toval( double( c.toNumberLongUnsafe( obj ) ) );        
    }
    
    JSBool numberlong_tonumber(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        return numberlong_valueof( cx, obj, argc, argv, rval );
    }

    JSBool numberlong_tostring(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval){    
        Convertor c(cx);
        stringstream ss;
        ss <<  c.toNumberLongUnsafe( obj );
        string ret = ss.str();
        return *rval = c.toval( ret.c_str() );
    }

    JSFunctionSpec numberlong_functions[] = {
    { "valueOf" , numberlong_valueof , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
    { "toNumber" , numberlong_tonumber , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
    { "toString" , numberlong_tostring , 0 , JSPROP_READONLY | JSPROP_PERMANENT, 0 } ,
    { 0 }
    };    
    
    JSClass minkey_class = {
        "MinKey" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };

    JSClass maxkey_class = {
        "MaxKey" , JSCLASS_HAS_PRIVATE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, JS_ResolveStub , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    
    // dbquery

    JSBool dbquery_constructor( JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval ){
        smuassert( cx ,  "DDQuery needs at least 4 args" , argc >= 4 );
        
        Convertor c(cx);
        c.setProperty( obj , "_mongo" , argv[0] );
        c.setProperty( obj , "_db" , argv[1] );
        c.setProperty( obj , "_collection" , argv[2] );
        c.setProperty( obj , "_ns" , argv[3] );

        if ( argc > 4 && JSVAL_IS_OBJECT( argv[4] ) )
            c.setProperty( obj , "_query" , argv[4] );
        else {
            JSObject * temp = JS_NewObject( cx , 0 , 0 , 0 );
            CHECKNEWOBJECT( temp, cx, "dbquery_constructor" );
            c.setProperty( obj , "_query" , OBJECT_TO_JSVAL( temp ) );
        }
        
        if ( argc > 5 && JSVAL_IS_OBJECT( argv[5] ) )
            c.setProperty( obj , "_fields" , argv[5] );
        else
            c.setProperty( obj , "_fields" , JSVAL_NULL );
        
        
        if ( argc > 6 && JSVAL_IS_NUMBER( argv[6] ) )
            c.setProperty( obj , "_limit" , argv[6] );
        else 
            c.setProperty( obj , "_limit" , JSVAL_ZERO );
        
        if ( argc > 7 && JSVAL_IS_NUMBER( argv[7] ) )
            c.setProperty( obj , "_skip" , argv[7] );
        else 
            c.setProperty( obj , "_skip" , JSVAL_ZERO );

        if ( argc > 8 && JSVAL_IS_NUMBER( argv[8] ) )
            c.setProperty( obj , "_batchSize" , argv[8] );
        else 
            c.setProperty( obj , "_batchSize" , JSVAL_ZERO );
        
        c.setProperty( obj , "_cursor" , JSVAL_NULL );
        c.setProperty( obj , "_numReturned" , JSVAL_ZERO );
        c.setProperty( obj , "_special" , JSVAL_FALSE );

        return JS_TRUE;
    }

    JSBool dbquery_resolve( JSContext *cx, JSObject *obj, jsval id, uintN flags, JSObject **objp ){
        if ( flags & JSRESOLVE_ASSIGNING )
            return JS_TRUE;

        if ( ! JSVAL_IS_NUMBER( id ) )
            return JS_TRUE;

        jsval val = JSVAL_VOID;
        assert( JS_CallFunctionName( cx , obj , "arrayAccess" , 1 , &id , &val ) );
        Convertor c(cx);
        c.setProperty( obj , c.toString( id ).c_str() , val );
        *objp = obj;
        return JS_TRUE;
    }

    JSClass dbquery_class = {
        "DBQuery" , JSCLASS_NEW_RESOLVE ,
        JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
        JS_EnumerateStub, (JSResolveOp)(&dbquery_resolve) , JS_ConvertStub, JS_FinalizeStub,
        JSCLASS_NO_OPTIONAL_MEMBERS
    };
    
    // ---- other stuff ----
    
    void initMongoJS( SMScope * scope , JSContext * cx , JSObject * global , bool local ){

        assert( JS_InitClass( cx , global , 0 , &mongo_class , local ? mongo_local_constructor : mongo_external_constructor , 0 , 0 , mongo_functions , 0 , 0 ) );
        
        assert( JS_InitClass( cx , global , 0 , &object_id_class , object_id_constructor , 0 , 0 , object_id_functions , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &db_class , db_constructor , 2 , 0 , 0 , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &db_collection_class , db_collection_constructor , 4 , 0 , 0 , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &internal_cursor_class , internal_cursor_constructor , 0 , 0 , internal_cursor_functions , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &dbquery_class , dbquery_constructor , 0 , 0 , 0 , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &dbpointer_class , dbpointer_constructor , 0 , 0 , dbpointer_functions , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &bindata_class , bindata_constructor , 0 , 0 , bindata_functions , 0 , 0 ) );

        assert( JS_InitClass( cx , global , 0 , &timestamp_class , 0 , 0 , 0 , 0 , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &numberlong_class , 0 , 0 , 0 , numberlong_functions , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &minkey_class , 0 , 0 , 0 , 0 , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &maxkey_class , 0 , 0 , 0 , 0 , 0 , 0 ) );

        assert( JS_InitClass( cx , global , 0 , &map_class , map_constructor , 0 , 0 , map_functions , 0 , 0 ) );
        
        assert( JS_InitClass( cx , global , 0 , &bson_ro_class , bson_cons , 0 , 0 , bson_functions , 0 , 0 ) );
        assert( JS_InitClass( cx , global , 0 , &bson_class , bson_cons , 0 , 0 , bson_functions , 0 , 0 ) );
        
        static const char *dbrefName = "DBRef";
        dbref_class.name = dbrefName;
        assert( JS_InitClass( cx , global , 0 , &dbref_class , dbref_constructor , 2 , 0 , bson_functions , 0 , 0 ) );
        
        scope->exec( jsconcatcode );
    }

    bool appendSpecialDBObject( Convertor * c , BSONObjBuilder& b , const string& name , jsval val , JSObject * o ){
        
        if ( JS_InstanceOf( c->_context , o , &object_id_class , 0 ) ){
            OID oid;
            oid.init( c->getString( o , "str" ) );
            b.append( name.c_str() , oid );
            return true;
        }

        if ( JS_InstanceOf( c->_context , o , &minkey_class , 0 ) ){
            b.appendMinKey( name.c_str() );
            return true;
        }

        if ( JS_InstanceOf( c->_context , o , &maxkey_class , 0 ) ){
            b.appendMaxKey( name.c_str() );
            return true;
        }
        
        if ( JS_InstanceOf( c->_context , o , &timestamp_class , 0 ) ){
            b.appendTimestamp( name.c_str() , (unsigned long long)c->getNumber( o , "t" ) , (unsigned int )c->getNumber( o , "i" ) );
            return true;
        }

        if ( JS_InstanceOf( c->_context , o , &numberlong_class , 0 ) ){
            b.append( name.c_str() , c->toNumberLongUnsafe( o ) );
            return true;
        }
        
        if ( JS_InstanceOf( c->_context , o , &dbpointer_class , 0 ) ){
            b.appendDBRef( name.c_str() , c->getString( o , "ns" ).c_str() , c->toOID( c->getProperty( o , "id" ) ) );
            return true;
        }
        
        if ( JS_InstanceOf( c->_context , o , &bindata_class , 0 ) ){
            void *holder = JS_GetPrivate( c->_context , o );
            const char *data = ( ( BinDataHolder * )( holder ) )->c_;
            b.appendBinData( name.c_str() , 
                             (int)(c->getNumber( o , "len" )) , (BinDataType)((char)(c->getNumber( o , "type" ) ) ) , 
                             data
                             );
            return true;
        }
        
#if defined( SM16 ) || defined( MOZJS )
#warning dates do not work in your version of spider monkey
        {
            jsdouble d = js_DateGetMsecSinceEpoch( c->_context , o );
            if ( d ){
                b.appendDate( name.c_str() , Date_t(d) );
                return true;
            }
        }
#elif defined( XULRUNNER )
        if ( JS_InstanceOf( c->_context , o, globalSMEngine->_dateClass , 0 ) ){
            jsdouble d = js_DateGetMsecSinceEpoch( c->_context , o );
            b.appendDate( name.c_str() , Date_t(d) );
            return true;
        }
#else
        if ( JS_InstanceOf( c->_context , o, &js_DateClass , 0 ) ){
            jsdouble d = js_DateGetMsecSinceEpoch( c->_context , o );
            //TODO: make signed
            b.appendDate( name.c_str() , Date_t((unsigned long long)d) );
            return true;
        }
#endif

        
        if ( JS_InstanceOf( c->_context , o , &dbquery_class , 0 ) ||
             JS_InstanceOf( c->_context , o , &mongo_class , 0 ) || 
             JS_InstanceOf( c->_context , o , &db_collection_class , 0 ) ){
            b.append( name.c_str() , c->toString( val ) );
            return true;
        }

#if defined( XULRUNNER ) 
        if ( JS_InstanceOf( c->_context , o , globalSMEngine->_regexClass , 0 ) ){
            c->appendRegex( b , name , c->toString( val ) );
            return true;
        }
#elif defined( SM18 ) 
        if ( JS_InstanceOf( c->_context , o , &js_RegExpClass , 0 ) ){
            c->appendRegex( b , name , c->toString( val ) );
            return true;
        }
#endif
        
        return false;
    }

    bool isDate( JSContext * cx , JSObject * o ){
#if defined( SM16 ) || defined( MOZJS ) || defined( XULRUNNER )
        return js_DateGetMsecSinceEpoch( cx , o ) != 0;
#else
        return JS_InstanceOf( cx , o, &js_DateClass, 0 );
#endif
    }
    
}