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backend_update_task.py
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backend_update_task.py
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#!/usr/bin/env python
# Copyright (c) 2009 Johan Uhle
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from google.appengine.runtime import DeadlineExceededError
from google.appengine.api.labs import taskqueue
from google.appengine.api import memcache
from google.appengine.ext import webapp
import wsgiref.handlers
import logging
import time
import os
import models
import backend_utils
import settings
class BackendUpdate(webapp.RequestHandler):
def post(self):
"""
This method queries the SoundCloud API, fetches the tracks having been uploaded
in the specified time and adds them to the task queue for further processing.
"""
try:
logging.info("Backend update task started")
logging.info("Fetching the tracks from SoundCloud")
time_from = self.request.get('time_from')
time_to = self.request.get('time_to')
tracks = backend_utils.get_latest_tracks_from_soundcloud()
logging.info("Fetched %i tracks from Soundcloud" % len(tracks))
if len(tracks) > 0:
counter = 0
for track in tracks:
track['id'] = unicode(track['id'])
memcache_add = memcache.add(track['id'],
track,
time=settings.TRACK_BACKEND_UPDATE_LIFETIME*60,
namespace="backend_update_track")
if memcache_add:
taskqueue.add(url='/backend-update/track',
params={'track_id': track['id'],
'time_track_added_to_queue': str(int(time.time()))})
logging.info("Added track_id %s to memcache and task queue." % track['id'])
counter += 1
else:
logging.error("Setting Memcache failed for track \"%s\" by \"%s\" (id: %s, created at: %s)." % \
(track['title'], track['user']['username'], track['id'], track['created_at']))
logging.info("Added %i tracks to the taskqueue" % counter)
else:
logging.info("Backend update finished without new tracks")
except DeadlineExceededError:
logging.warning("Backend Update has been canceled due to Deadline Exceeded")
for name in os.environ.keys():
logging.info("%s = %s" % (name, os.environ[name]))
def main():
wsgiref.handlers.CGIHandler().run(webapp.WSGIApplication([
('/backend-update-task', BackendUpdate),
]))
if __name__ == '__main__':
main()