keepalive.py 文件源码

def error_handler(url):
    global HANDLE_ERRORS
    orig = HANDLE_ERRORS
    keepalive_handler = HTTPHandler()
    opener = urllib2.build_opener(keepalive_handler)
    urllib2.install_opener(opener)
    pos = {0: 'off', 1: 'on'}
    for i in (0, 1):
        print "  fancy error handling %s (HANDLE_ERRORS = %i)" % (pos[i], i)
        HANDLE_ERRORS = i
        try:
            fo = urllib2.urlopen(url)
            foo = fo.read()
            fo.close()
            try: status, reason = fo.status, fo.reason
            except AttributeError: status, reason = None, None
        except IOError, e:
            print "  EXCEPTION: %s" % e
            raise
        else:
            print "  status = %s, reason = %s" % (status, reason)
    HANDLE_ERRORS = orig
    hosts = keepalive_handler.open_connections()
    print "open connections:", hosts
    keepalive_handler.close_all()