fileserver.py 文件源码

def WaitForFileServerToStart(port):
    """
    Wait for the Flask file server to start up.  Test it by trying the
    PyUpdater update URL, e.g. http://127.0.0.1:12345.  If we receive
    a ConnectionError, we continue waiting, but if we receive an HTTP
    response code (404), we return True.  For a frozen app, e.g. a
    Mac .app bundle, the location of the updates must be supplied by
    an environment variable, whereas when running from the source repo,
    the location of the updates is likely to be ./pyu-data/deploy/
    """
    url = 'http://%s:%s/fileserver-is-ready' % (LOCALHOST, port)
    attempts = 0
    while True:
        try:
            attempts += 1
            requests.get(url, timeout=1)
            return True
        except requests.exceptions.ConnectionError:
            time.sleep(0.25)
            if attempts > 10:
                logger.warning("WaitForFileServerToStart: timeout")
                return