const _getChannel = (slug, page = 1, cb) => {
  const key = `channelpage-channel-${ slug }-${ page }`;
  client
    .getAsync(key)
    .then((result) => {
      if (result) return cb(null, JSON.parse(result));
      _requestChannelWithVideos(slug, page)
      .then((data) => {
        cb(null, data);
        client.set(key, JSON.stringify(data));
        client.expire(key, _redisExpire);
      })
      .catch(cb);
    })
    .catch(cb);
};