Flask Snippets

Snippets are unofficial and unmaintained.

This is an archived view of user-submitted snippets. Despite being hosted on the Flask site, they are not official. No Flask maintainer has curated or checked the snippets for security, correctness, or design.

MongoKit multithreaded authentication

Posted by Laurie Clark-Michalek on 2011-08-19 @ 22:51 and filed in Database

As pymongo authentication is thread local, we need a seperate MongoKit connection object for each thread. This class provides a simple proxy object for managing the thread local connection objects. It expects a global `get_connection` function that takes a logger and returns a connection object.

class ThreadLocalConnectionProxy(object):
    A proxy object for a MongoKit connection object. As pymongo authentication
    is thread local, we need a seperate connection for each thread, which this
    proxy provides in a transparent manner.
    def __init__(self, logger):
        self.logger = logger
    def connect(self):
        Sets the thread local `mongodb_connection` attribute to a new connection
        aquired with :func:`get_connection`.
        self.thread_local.mongodb_connection = get_connection(self.logger)
    def connected(self):
        Returns true if there is a connection object in the thread local
        return hasattr(self.thread_local, "mongodb_connection")
    def thread_local(self):
        Thread local storage if possible, else object global.
        return flask._request_ctx_stack.top or self
    def __getattr__(self, name):
        if name == "logger":
            return super(ThreadLocalConnectionProxy, self).logger
        if not self.connected:
        return getattr(self.thread_local.mongodb_connection, name)

This snippet by Laurie Clark-Michalek can be used freely for anything you like. Consider it public domain.