qotnews/apiserver/server.py

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import logging
logging.basicConfig(
format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
level=logging.INFO)
import copy
import threading
import time
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import shelve
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import feed
from utils import gen_rand_id
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from flask import abort, Flask, request
from flask_cors import CORS
CACHE_LENGTH = 300
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DATA_FILE = 'data/data'
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news_index = 0
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with shelve.open(DATA_FILE) as db:
logging.info('Reading caches from disk...')
news_list = db.get('news_list', [])
news_ref_to_id = db.get('news_ref_to_id', {})
news_cache = db.get('news_cache', {})
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flask_app = Flask(__name__)
cors = CORS(flask_app)
@flask_app.route('/')
def index():
front_page = [news_cache[news_ref_to_id[ref]] for ref in news_list]
front_page = [copy.copy(x) for x in front_page if 'text' in x and x['text']][:100]
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for story in front_page:
if 'comments' in story: story.pop('comments')
if 'text' in story: story.pop('text')
return {'stories': front_page}
@flask_app.route('/<id>')
def comments(id):
if id in news_cache:
return {'story': news_cache[id]}
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with shelve.open(DATA_FILE) as db:
if id in db:
return {'story': db[id]}
abort(404)
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print('Starting Flask...')
web_thread = threading.Thread(target=flask_app.run, kwargs={'port': 33842})
web_thread.setDaemon(True)
web_thread.start()
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def new_id():
nid = gen_rand_id()
with shelve.open(DATA_FILE) as db:
while nid in news_cache or nid in db:
nid = gen_rand_id()
return nid
def remove_ref(old_ref, archive=False):
while old_ref in news_list:
news_list.remove(old_ref)
old_story = news_cache.pop(news_ref_to_id[old_ref])
old_id = news_ref_to_id.pop(old_ref)
logging.info('Removed ref {} id {}.'.format(old_ref, old_id))
if archive:
with shelve.open(DATA_FILE) as db:
db[old_id] = old_story
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try:
while True:
if news_index == 0:
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feed_list = feed.list()
new_items = [(ref, source) for ref, source in feed_list if ref not in news_list]
for ref, source in new_items:
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news_list.insert(0, ref)
nid = new_id()
news_ref_to_id[ref] = nid
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news_cache[nid] = dict(id=nid, ref=ref, source=source)
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if len(new_items):
logging.info('Added {} new refs.'.format(len(new_items)))
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while len(news_list) > CACHE_LENGTH:
old_ref = news_list[-1]
remove_ref(old_ref, archive=True)
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if news_index < len(news_list):
update_ref = news_list[news_index]
update_id = news_ref_to_id[update_ref]
news_story = news_cache[update_id]
valid = feed.update_story(news_story)
if not valid:
remove_ref(update_ref)
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time.sleep(3)
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news_index += 1
if news_index == CACHE_LENGTH: news_index = 0
finally:
with shelve.open(DATA_FILE) as db:
logging.info('Writing caches to disk...')
db['news_list'] = news_list
db['news_ref_to_id'] = news_ref_to_id
db['news_cache'] = news_cache