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queue.py
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queue.py
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#!/usr/bin/env
from flask import current_app
from flask import json
import pickle
import uuid
import time
import settings
import config
class DelayedResult(object):
def __init__(self, key):
self.db = config.get_redis_connection()
self.key = key
self._rv = None
@property
def return_value(self):
if self._rv is None:
rv = self.db.get('{0}:{1}'.format(self.key))
if rv is not None:
self._rv = pickle.loads(rv)
return self._rv
def task(f):
def delay(*args, **kwargs):
db = config.get_redis_connection()
qkey = settings.TASK_QUEUE_NAME
task_id = str(uuid.uuid4())
key = '{0}:{1}'.format(qkey, task_id)
s = pickle.dumps((f, task_id, args, kwargs))
db.rpush(settings.TASK_QUEUE_NAME, s)
return DelayedResult(task_id)
f.delay = delay
return f
def queue_daemon(app, rv_ttl=settings.TASK_QUEUE_KEY_TTL):
db = config.get_redis_connection()
while True:
msg = db.blpop(settings.TASK_QUEUE_NAME)
print('Running task: {0}'.format(msg))
func, task_id, args, kwargs = pickle.loads(msg[1])
qkey = settings.TASK_QUEUE_NAME
key = '{0}:{1}'.format(qkey, task_id)
data = {'date': time.time(), 'task_id': task_id, 'status': 'running', 'result': None}
db.set(key, json.dumps(data))
try:
rv = func(*args, **kwargs)
data['status'] = 'complete'
except Exception, e:
import traceback
traceback.print_exc()
rv = e
data['status'] = 'error'
if not isinstance(rv, dict):
rv = str(rv)
data['result'] = rv
if rv is not None:
db.set(key, json.dumps(data))
db.expire(key, rv_ttl)
if __name__=='__main__':
print('Starting queue...')
try:
app = config.create_app()
queue_daemon(app)
except KeyboardInterrupt:
print('Exiting...')