#
# Copyright 2017, 2016 Laszlo Zeke
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import webapp2
from webapp2 import Route
import urllib2
import json
import datetime
import logging
from feedformatter import Feed
from google.appengine.api import memcache
from app_id import TWITCH_CLIENT_ID
VODCACHE_PREFIX = 'vodcache'
USERIDCACHE_PREFIX = 'userid'
VOD_URL_TEMPLATE = 'https://api.twitch.tv/kraken/channels/%s/videos?broadcast_type=archive,highlight,upload'
USERID_URL_TEMPLATE = 'https://api.twitch.tv/kraken/users?login=%s'
VODCACHE_LIFETIME = 120
USERIDCACHE_LIFETIME = 0 # No expire
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.headers['Content-Type'] = 'text/html'
html_resp = """
Twitch stream RSS generator
Twitch stream RSS generator
You can get RSS of broadcasts by subscribing to https://twitchrss.appspot.com/vod/<channel name>
For example: https://twitchrss.appspot.com/vod/riotgames
Not endorsed by Twitch.tv, just a fun project.
Project home
"""
self.response.write(html_resp)
class RSSVoDServer(webapp2.RequestHandler):
def get(self, channel):
userid_json = self.fetch_userid(channel)
(channel_display_name, channel_id) = self.extract_userid(json.loads(userid_json))
channel_json = self.fetch_vods(channel_id)
decoded_json = json.loads(channel_json)
rss_data = self.construct_rss(channel, decoded_json, channel_display_name)
self.response.headers['Content-Type'] = 'application/xhtml+xml'
self.response.write(rss_data)
def head(self,channel):
self.get(channel)
def fetch_userid(self, channel_name):
return self.fetch_or_cache_object(channel_name, USERIDCACHE_PREFIX, USERID_URL_TEMPLATE, USERIDCACHE_LIFETIME)
def fetch_vods(self, channel_id):
return self.fetch_or_cache_object(channel_id, VODCACHE_PREFIX, VOD_URL_TEMPLATE, VODCACHE_LIFETIME)
def fetch_or_cache_object(self, channel, key_prefix, url_template, cache_time):
json_data = self.lookup_cache(channel, key_prefix)
if json_data == '':
json_data = self.fetch_json(channel, url_template)
if json_data == '':
self.abort(404)
else:
self.store_cache(channel, json_data, key_prefix, cache_time)
return json_data
@staticmethod
def lookup_cache(channel_name, key_prefix):
cached_data = memcache.get('%s:v5:%s' % (key_prefix, channel_name))
if cached_data is not None:
logging.debug('Cache hit for %s' % channel_name)
return cached_data
else:
logging.debug('Cache miss for %s' % channel_name)
return ''
@staticmethod
def store_cache(channel_name, data, key_prefix, cache_lifetime):
try:
logging.debug('Cached data for %s' % channel_name)
memcache.set('%s:v5:%s' % (key_prefix, channel_name), data, cache_lifetime)
except BaseException as e:
logging.warning('Memcache exception: %s' % e)
return
@staticmethod
def fetch_json(id, url_template):
url = url_template % id
headers = {
'Accept': 'application/vnd.twitchtv.v5+json',
'Client-ID': TWITCH_CLIENT_ID
}
request = urllib2.Request(url, headers=headers)
retries = 0
while retries < 3:
try:
result = urllib2.urlopen(request, timeout=3)
logging.debug('Fetch from twitch for %s with code %s' % (id, result.getcode()))
return result.read()
except BaseException as e:
logging.warning("Fetch exception caught: %s" % e)
retries += 1
return ''
def extract_userid(self, user_info):
userlist = user_info.get('users')
if userlist is None or len(userlist) < 1:
logging.info('No such user found.')
self.abort(404)
# Get the first id in the list
userid = userlist[0].get('_id')
username = userlist[0].get('display_name')
if username and userid:
return username, userid
else:
logging.warning('Userid is not found in %s' % user_info)
self.abort(404)
def construct_rss(self, channel_name, vods_info, display_name):
feed = Feed()
# Set the feed/channel level properties
feed.feed["title"] = "%s's Twitch video RSS" % display_name
feed.feed["link"] = "https://twitchrss.appspot.com/"
feed.feed["author"] = "Twitch RSS Gen"
feed.feed["description"] = "The RSS Feed of %s's videos on Twitch" % display_name
feed.feed["ttl"] = '10'
# Create an item
try:
if vods_info['videos'] is not None:
for vod in vods_info['videos']:
item = {}
if vod["status"] == "recording":
link = "http://www.twitch.tv/%s" % channel_name
item["title"] = "%s - LIVE" % vod['title']
item["category"] = "live"
else:
link = vod['url']
item["title"] = vod['title']
item["category"] = vod['broadcast_type']
item["link"] = link
item["description"] = "![](\"%s\")
" % (link, vod['preview']['large'])
if vod.get('description_html'):
item["description"] += "
" + vod['description_html']
d = datetime.datetime.strptime(vod['created_at'], '%Y-%m-%dT%H:%M:%SZ')
item["pubDate"] = d.timetuple()
item["guid"] = vod['_id']
if vod["status"] == "recording": # To show a different news item when recording is over
item["guid"] += "_live"
feed.items.append(item)
except KeyError as e:
logging.warning('Issue with json: %s\nException: %s' % (vods_info, e))
self.abort(404)
return feed.format_rss2_string()
app = webapp2.WSGIApplication([
Route('/', MainPage),
Route('/vod/', RSSVoDServer)
], debug=False)