non-blocking session provider

[WyriHaximus]

Currently the session provider reads out session data in a blocking way. This is okey but not an option if we want to go for a full non-blocking websocket server. Creating an deferrable interface would allow for predis async to be used as well as still supporting sf2 sessions within a wrapper. It would make the plain sf2 sessions a bit more complicated but allows more adapters then just predis. Below is some pseudo code how it could be done.

interface {
    readSession(sessionId);
}

concrete class {
    readSession(sessionId) {
        promise = new promise;
        this->client->get(sessionId, promise);
        return promise;
    }
}

Another thing is should the onOpen call wait for the session to be retrieved or fire anyway and fire another call for the session data?

Possible adapters:

• PredisAsync
• MySQL
• Blocking adapter running in a seperrate process made possible by:
  • 0MQ
  • ChildProcess

[cboden]

#142

[cboden]

ping @nervo