Compress alerts with zlib level 1 to fit in sheriff-o-matic's memcache.

Tools/GardeningServer/alerts.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import calendar
 import datetime
 import json
 import webapp2
+import zlib
 
 from google.appengine.api import memcache
 
 
 class DateTimeEncoder(json.JSONEncoder):
     def default(self, obj):
         if isinstance(obj, datetime.datetime):
             return calendar.timegm(obj.timetuple())
         # Let the base class default method raise the TypeError
         return json.JSONEncoder.default(self, obj)
 
 
 class AlertsHandler(webapp2.RequestHandler):
     MEMCACHE_ALERTS_KEY = 'alerts'
 
     def get(self):
         self.response.headers.add_header('Access-Control-Allow-Origin', '*')
         self.response.headers['Content-Type'] = 'application/json'
-        alerts = memcache.get(AlertsHandler.MEMCACHE_ALERTS_KEY)
-        if not alerts:
+        compressed = memcache.get(AlertsHandler.MEMCACHE_ALERTS_KEY)
+        if not compressed:
             return
-        self.response.write(json.dumps(alerts, cls=DateTimeEncoder, indent=1))
+        uncompressed = zlib.decompress(compressed)
+        self.response.write(uncompressed)
 
     def post(self):
         try:
             alerts = json.loads(self.request.get('content'))
         except ValueError:
             self.response.set_status(400, 'content field was not JSON')
             return
         alerts.update({
             'date': datetime.datetime.utcnow(),
             'alerts': alerts['alerts']
         })
-        memcache.set(AlertsHandler.MEMCACHE_ALERTS_KEY, alerts)
+        uncompressed = json.dumps(alerts, cls=DateTimeEncoder, indent=1)
+        compression_level = 1
+        compressed = zlib.compress(uncompressed, compression_level)

[ojan, 2014/08/14 01:03:51]

Nit: can you just do the following?
compressed = zlib.compress(uncompressed, level=1)

+        memcache.set(AlertsHandler.MEMCACHE_ALERTS_KEY, compressed)
 
 
 app = webapp2.WSGIApplication([
     ('/alerts', AlertsHandler)
 ])