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POPython socket error resilience / workaround
 

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  1. POPython socket error resilience / workaround
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    <p>I have a script running that is testing a series of urls for availability.</p> <p>This is one of the functions.</p> <pre><code>def checkUrl(url): # Only downloads headers, returns status code. p = urlparse(url) conn = httplib.HTTPConnection(p.netloc) conn.request('HEAD', p.path) resp = conn.getresponse() return resp.status </code></pre> <p>Occasionally, the VPS will lose connectivity, the entire script crashes when that occurs.</p> <pre><code>File "/usr/lib/python2.6/httplib.py", line 914, in request self._send_request(method, url, body, headers) File "/usr/lib/python2.6/httplib.py", line 951, in _send_request self.endheaders() File "/usr/lib/python2.6/httplib.py", line 908, in endheaders self._send_output() File "/usr/lib/python2.6/httplib.py", line 780, in _send_output self.send(msg) File "/usr/lib/python2.6/httplib.py", line 739, in send self.connect() File "/usr/lib/python2.6/httplib.py", line 720, in connect self.timeout) File "/usr/lib/python2.6/socket.py", line 561, in create_connection raise error, msg socket.error: [Errno 101] Network is unreachable </code></pre> <p>I'm not at all familiar with handling errors like this in python.</p> <p>What is the appropriate way to keep the script from crashing when network connectivity is temporarily lost?</p> <hr> <p>Edit:</p> <p>I ended up with this - feedback?</p> <pre><code>def checkUrl(url): # Only downloads headers, returns status code. try: p = urlparse(url) conn = httplib.HTTPConnection(p.netloc) conn.request('HEAD', p.path) resp = conn.getresponse() return resp.status except IOError, e: if e.errno == 101: print "Network Error" time.sleep(1) checkUrl(url) else: raise </code></pre> <p>I'm not sure I fully understand what raise does though..</p>
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    1. COPlease read Python documentation before asking questions: http://docs.python.org/tutorial/errors.html
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