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utils.py
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utils.py
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import models
from google.appengine.ext import db
from google.appengine.api import memcache
""" returns sms message body with top 3 food trucks/votes """
def getTop3():
top3 = db.GqlQuery("SELECT * FROM Truck ORDER BY counter DESC LIMIT 3")
msg="Thanks for voting! Leaderboard: "
for truck in top3:
msg=msg+truck.name+" - "+str(truck.counter)+" votes | "
return msg
""" incerement counter for defined food truck, based on foodtruck handle"""
def incrementCounter(key, update_interval=10):
"""Increments a memcached counter.
Args:
key: The key of a datastore entity that contains the counter.
update_interval: Minimum interval between updates.
"""
lock_key = "counter_lock:%s" % (key,)
count_key = "counter_value:%s" % (key,)
if memcache.add(lock_key, None, time=update_interval):
# Time to update the DB
count = int(memcache.get(count_key) or 0) + 1
def tx():
entity = models.Truck.get_by_key_name(key)
entity.counter += count
entity.put()
db.run_in_transaction(tx)
memcache.delete(count_key)
else:
# Just update memcache
memcache.incr(count_key, initial_value=0)