youtube_thumbnails_cache.py 文件源码

def fetch_thumbnail_from_youtube(self, at_milliseconds):
        """
            Retrieves the YT thumbnail.

            Returns the raw image content with the
        """
        url = \
        "http://img.youtube.com/vd?id={yt_id}&ats={at_milliseconds}".format(
            yt_id=self.youtube_id, at_milliseconds=at_milliseconds)

        retries = 0
        content = None
        found = False
        while retries <= self.max_fetch_retries:
            result = urlfetch.fetch(url, deadline=50)
            if result.status_code in (200, 404,):
                content = result.content

            if result.status_code == 200:
                found = True
                break
            else:
                retries += 1

        return content, found