[Twisted-Python] Looking for a simple file event driven loop using Twisted

[steven howe]

Looks like a winner. Thank you very much.

Steven

On Fri, 25 Mar 2005 23:57:07 -0800, Dave Cook <daverz at gmail.com> wrote:
> Using Ken's first example, here's what I came up with:
> 
> import os
> import stat
> from twisted.internet import reactor
> 
> class FileWatcher:
> 
>     def __init__(self, period, filename):
>         self.period = period
>         self.filename = filename
>         self.callbacks = []
>         self.mtime = os.stat(filename)[stat.ST_MTIME]
>         reactor.callWhenRunning(self.checkFile)
> 
>     def addCallback(self, callback):
>         self.callbacks.append(callback)
> 
>     def removeCallback(self, callback):
>         self.callbacks.remove(callback)
> 
>     def checkFile(self):
>         mtime = os.stat(self.filename)[stat.ST_MTIME]
>         if mtime > self.mtime:
>             self.mtime = mtime
>             for callback in self.callbacks:
>                 callback(self.filename, mtime)
>         reactor.callLater(self.period, self.checkFile)
> 
> if __name__=='__main__':
> 
>     import time
> 
>     def changed(filename, mtime):
>         print "%s modified at %s." % (filename, time.ctime(mtime))
> 
>     open('/tmp/foo', "w").close()
>     FileWatcher(0.1, '/tmp/foo').addCallback(changed)
>     reactor.run()
> 
> Run it in one terminal window, and in the other run
> 
>   touch /tmp/foo
> 
> to see what happens.
> 
> _______________________________________________
> Twisted-Python mailing list
> Twisted-Python at twistedmatrix.com
> http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>