/usr/share/pyshared/celery/backends/redis.py is in python-celery 2.5.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | # -*- coding: utf-8 -*-
from __future__ import absolute_import
from ..exceptions import ImproperlyConfigured
from ..utils import cached_property
from .base import KeyValueStoreBackend
try:
import redis
from redis.exceptions import ConnectionError
except ImportError:
redis = None # noqa
ConnectionError = None # noqa
class RedisBackend(KeyValueStoreBackend):
"""Redis task result store."""
#: redis-py client module.
redis = redis
#: default Redis server hostname (`localhost`).
host = "localhost"
#: default Redis server port (6379)
port = 6379
#: default Redis db number (0)
db = 0
#: default Redis password (:const:`None`)
password = None
#: Maximium number of connections in the pool.
max_connections = None
supports_native_join = True
def __init__(self, host=None, port=None, db=None, password=None,
expires=None, max_connections=None, **kwargs):
super(RedisBackend, self).__init__(**kwargs)
conf = self.app.conf
if self.redis is None:
raise ImproperlyConfigured(
"You need to install the redis library in order to use "
+ "Redis result store backend.")
# For compatibility with the old REDIS_* configuration keys.
def _get(key):
for prefix in "CELERY_REDIS_%s", "REDIS_%s":
try:
return conf[prefix % key]
except KeyError:
pass
self.host = host or _get("HOST") or self.host
self.port = int(port or _get("PORT") or self.port)
self.db = db or _get("DB") or self.db
self.password = password or _get("PASSWORD") or self.password
self.expires = self.prepare_expires(expires, type=int)
self.max_connections = (max_connections
or _get("MAX_CONNECTIONS")
or self.max_connections)
def get(self, key):
return self.client.get(key)
def mget(self, keys):
return self.client.mget(keys)
def set(self, key, value):
client = self.client
if self.expires is not None:
client.setex(key, value, self.expires)
else:
client.set(key, value)
client.publish(key, value)
def delete(self, key):
self.client.delete(key)
def on_chord_apply(self, setid, body, result=None, **kwargs):
self.app.TaskSetResult(setid, result).save()
def on_chord_part_return(self, task, propagate=False):
from ..task.sets import subtask
from ..result import TaskSetResult
setid = task.request.taskset
if not setid:
return
key = self.get_key_for_chord(setid)
deps = TaskSetResult.restore(setid, backend=task.backend)
if self.client.incr(key) >= deps.total:
subtask(task.request.chord).delay(deps.join(propagate=propagate))
deps.delete()
self.client.delete(key)
else:
self.client.expire(key, 86400)
@cached_property
def client(self):
pool = self.redis.ConnectionPool(host=self.host, port=self.port,
db=self.db, password=self.password,
max_connections=self.max_connections)
return self.redis.Redis(connection_pool=pool)
def __reduce__(self, args=(), kwargs={}):
kwargs.update(
dict(host=self.host,
port=self.port,
db=self.db,
password=self.password,
expires=self.expires,
max_connections=self.max_connections))
return super(RedisBackend, self).__reduce__(args, kwargs)
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