The Python logging module has some nice built-in LogHandlers that do network IO, but I couldn't square with having HTTP POSTs and SMTP sends in web response threads. I didn't find an asynchronous logging wrapper, so I wrote a decorator of sorts using the really nifty monkey patching availble in python:
def patchAsyncEmit(handler): base_emit = handler.emit queue = Queue.Queue() def loop(): while True: record = queue.get(True) # blocks try : base_emit(record) except: # not much you can do when your logger is broken print sys.exc_info( thread = threading.Thread(target=loop) thread.daemon = True thread.start( def asyncEmit(record): queue.put(record) handler.emit = asyncEmit return handler
In a more traditional OO language I'd do that with extension or a dynamic proxy, and in Scala I'd do it as a trait, but this saved me having to write delegates for all the other methods in LogHandler.
Did I miss this in the standard logging stuff, does everyone roll their own, or is everyone else okay doing remote logging in a web thread?
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