def fetch(ip):
    url = 'http://ip.taobao.com/service/getIpInfo.php?ip=' + ip
    result = []    try:
        response = urllib.urlopen(url).read()
        jsondata = json.loads(response)        if jsondata[u'code'] == 0:
            result.append(jsondata[u'data'][u'ip'].encode('utf-8'))            
            result.append(jsondata[u'data'][u'country'].encode('utf-8'))
            result.append(jsondata[u'data'][u'country_id'].encode('utf-8'))
            result.append(jsondata[u'data'][u'area'].encode('utf-8'))
            result.append(jsondata[u'data'][u'area_id'].encode('utf-8'))
            result.append(jsondata[u'data'][u'region'].encode('utf-8'))
            result.append(jsondata[u'data'][u'region_id'].encode('utf-8'))
            result.append(jsondata[u'data'][u'city'].encode('utf-8'))
            result.append(jsondata[u'data'][u'city_id'].encode('utf-8'))
            result.append(jsondata[u'data'][u'county'].encode('utf-8'))
            result.append(jsondata[u'data'][u'county_id'].encode('utf-8'))
            result.append(jsondata[u'data'][u'isp'].encode('utf-8'))
            result.append(jsondata[u'data'][u'isp_id'].encode('utf-8'))            
        else:            return 0, result    except:
        logging.exception("Url open failed:" + url)        return 0, result    return 1, result 
def worker(ratelimit, jobs, results, progress):    global cancel    while not cancel:        try:
            ratelimit.ratecontrol()
            ip = jobs.get(timeout=2) # Wait 2 seconds
            ok, result = fetch(ip)            if not ok:
                logging.error("Fetch information failed, ip:{}".format(ip))
                progress.put("") # Notify the progress even it failed
            elif result is not None:
                results.put(" ".join(result))
            jobs.task_done()    # Notify one item
        except Queue.Empty:            pass
        except:
            logging.exception("Unknown Error!")

def process(target, results, progress):    global cancel    while not cancel:        try:
            line = results.get(timeout=5)        except Queue.Empty:            pass
        else:            print >>target, line
            progress.put("")
            results.task_done()

def progproc(progressbar, count, progress):    """
    Since ProgressBar is not a thread-safe class, we use a Queue to do the counting job, like
    two other threads. Use this thread do the printing of progress bar. By the way, it will
    print to stderr, which does not conflict with the default result output(stdout).    """
    idx = 1    while True:        try:
            progress.get(timeout=5)        except Queue.Empty:            pass
        else:
            progressbar.update(idx)
            idx += 1