CQ: add a timeout for socket operations

commit-queue/verification/tree_status.py

 # coding=utf8
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Postpone commits until the tree is open."""
 
 import calendar
 import json
 import logging
+import ssl
 import time
 import urllib2
 
 from verification import base
 
 
 class TreeStatus(base.IVerifierStatus):
   tree_status_url = unicode
   issue = int
   last_tree_status = unicode
@@ skipping 19 matching lines @@
       for item in sorted(data, key=lambda x: x['date'], reverse=True):
         if item['general_state'] != 'open':
           logging.warn(
               'Not committing CL %d because the tree was closed %ds ago',
               self.issue, int(now - item['date']))
           self.last_tree_status = unicode(item['message'])
           return True
         if item['date'] < cutoff:
           break
       return False
-    except (urllib2.URLError, ValueError):
+    except (ssl.SSLError, urllib2.URLError, ValueError):
       logging.error('Failed to request tree status! %s' % url)
       return True
 
   def why_not(self):
     if self.last_tree_status:
       return u'Tree is currently not open: %s' % self.last_tree_status
 
 
 class TreeStatusVerifier(base.Verifier):
   """Checks the tree status before allowing a commit."""
   name = 'tree status'
 
   def __init__(self, tree_status_url):
     super(TreeStatusVerifier, self).__init__()
     self.tree_status_url = tree_status_url
 
   def verify(self, pending):
     pending.verifications[self.name] = TreeStatus(
         tree_status_url=self.tree_status_url, issue=pending.issue)
 
   def update_status(self, queue):
     pass