notify when db is ready

Hi

I have tried using your level db from another module.

I can use this, this.levelConfig = RED.nodes.getNode(n.level);

Then access this.levelConfig.db.get/put

However, there is a latency issue in that I am not aware when the db has been initialised.

Suggest emitting even here:

   lvldb(this.dbname, function(err, db) {
        if (err) { node.error(err); }
        node.db = db;
        node.emit("connect");  // Flag to other modules when db is ready!
    });

From my node I can then use the following during initialisation:

    this.levelConfig.on('connect', function() { ... });

Welcome your thoughts.

Start by locating the lvldb(this.dbname, callback) initialization and the levelConfig.db access used by other modules. Check how readiness is currently exposed, then verify that consumers can listen for the proposed connect event before using get/put and that initialization errors remain reported.