def get_tweets(self, limit=10, offset=0):
from tweet import Tweet
new_tweets = []
cached_media = memcache.get(self.id) or {}
cached_tweets_json = cached_media.get('tweets') or []
if not cached_tweets_json or limit + offset > len(cached_tweets_json):
tweets = Tweet.all().filter('media =', self)
if len(cached_tweets_json) and offset < len(cached_tweets_json):
latest_time = iso8601.parse_date(cached_tweets_json[0]['time']).replace(tzinfo=None)
tweets = tweets.filter('time >', latest_time)
tweets = tweets.order('-time').fetch(limit, offset=offset)
if tweets and len(tweets):
new_time = tweets[0].time
inserted = False
# Insert by timestamp
for i in range(len(cached_tweets_json)):
time = iso8601.parse_date(cached_tweets_json[i]['time']).replace(tzinfo=None)
if new_time > time:
for t in tweets:
if t.id == cached_tweets_json[i]['id']:
break
new_tweets.append(t.to_json())
inserted = True
if inserted:
new_tweets += cached_tweets_json[i:]
break
new_tweets.append(cached_tweets_json[i])
if not cached_tweets_json or not inserted:
new_tweets = cached_tweets_json + [t.to_json() for t in tweets]
cached_tweets_json = new_tweets if len(new_tweets) else cached_tweets_json
cached_media['tweets'] = cached_tweets_json
memcache.set(self.id, cached_media)
return cached_tweets_json[offset:offset+limit]
