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POThe thread hangs using FTP LIST with Python
 

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  1. POThe thread hangs using FTP LIST with Python
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    <p>I'm using ftplib for connecting and getting file list from FTP server. The problem I have is that the connection hangs from time to time and I don't know why. I'm running python script as a daemon, using threads. See what I mean:</p> <pre><code>def main(): signal.signal(signal.SIGINT, signal_handler) app.db = MySQLWrapper() try: app.opener = FTP_Opener() mainloop = MainLoop() while not app.terminate: # suspend main thread until the queue terminates # this lets to restart the queue automatically in case of unexpected shutdown mainloop.join(10) while (not app.terminate) and (not mainloop.isAlive()): time.sleep(script_timeout) print time.ctime(), "main: trying to restart the queue" try: mainloop = MainLoop() except Exception: time.sleep(60) finally: app.db.close() app.db = None app.opener = None mainloop = None try: os.unlink(PIDFILE) except: pass # give other threads time to terminate time.sleep(1) print time.ctime(), "main: main thread terminated" </code></pre> <p>MainLoop() has some functions for FTP connect, download specific files and disconnect from the server. </p> <p>Here's how I get the file's list:</p> <pre><code>file_list = app.opener.load_list() </code></pre> <p>And how FTP_Opener.load_list() function looks like:</p> <pre><code>def load_list(self): attempts = 0 while attempts&lt;=ftp_config.load_max_attempts: attempts += 1 filelist = [] try: self._connect() self._chdir() # retrieve file list to 'filelist' var self.FTP.retrlines('LIST', lambda s: filelist.append(s)) filelist = self._filter_filelist(self._parse_filelist(filelist)) return filelist except Exception: print sys.exc_info() self._disconnect() sleep(0.1) print time.ctime(), "FTP Opener: can't load file list" return [] </code></pre> <p>Why sometimes the FTP connection hangs and how can I monitor this? So if it happens I would like to terminate the thread somehow and start a new one.</p> <p>Thanks</p>
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