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POSetting a timeout for mechanize.Browser
 

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    <p>I was perusing the question posted here: </p> <p><a href="https://stackoverflow.com/questions/8464391/what-should-i-do-if-socket-setdefaulttimeout-is-not-working">What should I do if socket.setdefaulttimeout() is not working?</a></p> <p>to try and come up with a solution to kill requests when my <code>mechanize.Browser</code> object is taking too long, and I have been experimenting with the first solution in tomasz's edit (reposted here for clarity):</p> <pre><code>import signal, time def request(arg): """Your http request""" time.sleep(2) return arg class Timeout(): """Timeout class using ALARM signal""" class Timeout(Exception): pass def __init__(self, sec): self.sec = sec def __enter__(self): signal.signal(signal.SIGALRM, self.raise_timeout) signal.alarm(self.sec) def __exit__(self, *args): signal.alarm(0) # disable alarm def raise_timeout(self, *args): raise Timeout.Timeout() # Run block of code with timeouts try: with Timeout(3): print request("Request 1") with Timeout(1): print request("Request 2") except Timeout.Timeout: print "Timeout" # Prints "Request 1" and "Timeout" </code></pre> <p>When I run this from my terminal using <code>python timeout.py</code> (version is<code>Python 2.7.2+</code> and I am on Ubuntu 11.10 Oneiric Ocelot), there is no exception thrown- instead it simply prints</p> <pre><code>Request 1 Request 2 </code></pre> <p>Could someone please explain how to fix this? An explanation of what's going on with those <code>signal.alarm</code> and <code>signal.signal</code> calls would be awesome too.</p> <p>Thank you very much for your time!</p> <p>EDIT:</p> <p>Running <code>strace -f python timeout.py</code> yields:</p> <pre><code>alarm(3) = 0 select(0, NULL, NULL, NULL, {2, 0}) = 0 (Timeout) fstat64(1, {st_mode=S_IFREG|0664, st_size=0, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb740c000 alarm(0) = 1 rt_sigaction(SIGALRM, {0x812f450, [], 0}, {0x812f450, [], 0}, 8) = 0 alarm(1) = 0 select(0, NULL, NULL, NULL, {2, 0}) = 0 (Timeout) alarm(0) = 0 rt_sigaction(SIGINT, {SIG_DFL, [], 0}, {0x812f450, [], 0}, 8) = 0 rt_sigaction(SIGALRM, {SIG_DFL, [], 0}, {0x812f450, [], 0}, 8) = 0 write(1, "Request 1\nRequest 2\n", 20) = 20 exit_group(0) = ? </code></pre>
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    1. COMaybe `sleep` uses `SIGALRM` internally, that is plausible and would mess up your test. Try doing a blocking I/O op instead of sleep (just read from stdin and don't type anything at the console).
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    2. COIt works for me, same version of Ubuntu. You didn't forget `#!/usr/bin/env python` or `chmod 777 <filename>` did you?
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    3. COcode works as expected in my environment (cPython 2.6.5 / ubuntu 9.04)
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      1. USPaulo Scardine
 

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