/usr/lib/python2.7/dist-packages/celery/backends/redis.py is in python-celery 4.1.0-2ubuntu1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 | # -*- coding: utf-8 -*-
"""Redis result store backend."""
from __future__ import absolute_import, unicode_literals
from functools import partial
from kombu.utils.functional import retry_over_time
from kombu.utils.objects import cached_property
from kombu.utils.url import _parse_url
from celery import states
from celery._state import task_join_will_block
from celery.canvas import maybe_signature
from celery.exceptions import ChordError, ImproperlyConfigured
from celery.five import string_t
from celery.utils import deprecated
from celery.utils.functional import dictfilter
from celery.utils.log import get_logger
from celery.utils.time import humanize_seconds
from . import async
from . import base
try:
import redis
from kombu.transport.redis import get_redis_error_classes
except ImportError: # pragma: no cover
redis = None # noqa
get_redis_error_classes = None # noqa
__all__ = ['RedisBackend']
E_REDIS_MISSING = """
You need to install the redis library in order to use \
the Redis result store backend.
"""
E_LOST = 'Connection to Redis lost: Retry (%s/%s) %s.'
logger = get_logger(__name__)
class ResultConsumer(async.BaseResultConsumer):
_pubsub = None
def __init__(self, *args, **kwargs):
super(ResultConsumer, self).__init__(*args, **kwargs)
self._get_key_for_task = self.backend.get_key_for_task
self._decode_result = self.backend.decode_result
self.subscribed_to = set()
def start(self, initial_task_id, **kwargs):
self._pubsub = self.backend.client.pubsub(
ignore_subscribe_messages=True,
)
self._consume_from(initial_task_id)
def on_wait_for_pending(self, result, **kwargs):
for meta in result._iter_meta():
if meta is not None:
self.on_state_change(meta, None)
def stop(self):
if self._pubsub is not None:
self._pubsub.close()
def drain_events(self, timeout=None):
m = self._pubsub.get_message(timeout=timeout)
if m and m['type'] == 'message':
self.on_state_change(self._decode_result(m['data']), m)
def consume_from(self, task_id):
if self._pubsub is None:
return self.start(task_id)
self._consume_from(task_id)
def _consume_from(self, task_id):
key = self._get_key_for_task(task_id)
if key not in self.subscribed_to:
self.subscribed_to.add(key)
self._pubsub.subscribe(key)
def cancel_for(self, task_id):
if self._pubsub:
key = self._get_key_for_task(task_id)
self.subscribed_to.discard(key)
self._pubsub.unsubscribe(key)
class RedisBackend(base.BaseKeyValueStoreBackend, async.AsyncBackendMixin):
"""Redis task result store."""
ResultConsumer = ResultConsumer
#: :pypi:`redis` client module.
redis = redis
#: Maximum number of connections in the pool.
max_connections = None
supports_autoexpire = True
supports_native_join = True
def __init__(self, host=None, port=None, db=None, password=None,
max_connections=None, url=None,
connection_pool=None, **kwargs):
super(RedisBackend, self).__init__(expires_type=int, **kwargs)
_get = self.app.conf.get
if self.redis is None:
raise ImproperlyConfigured(E_REDIS_MISSING.strip())
if host and '://' in host:
url, host = host, None
self.max_connections = (
max_connections or
_get('redis_max_connections') or
self.max_connections)
self._ConnectionPool = connection_pool
socket_timeout = _get('redis_socket_timeout')
socket_connect_timeout = _get('redis_socket_connect_timeout')
self.connparams = {
'host': _get('redis_host') or 'localhost',
'port': _get('redis_port') or 6379,
'db': _get('redis_db') or 0,
'password': _get('redis_password'),
'max_connections': self.max_connections,
'socket_timeout': socket_timeout and float(socket_timeout),
'socket_connect_timeout':
socket_connect_timeout and float(socket_connect_timeout),
}
# "redis_backend_use_ssl" must be a dict with the keys:
# 'ssl_cert_reqs', 'ssl_ca_certs', 'ssl_certfile', 'ssl_keyfile'
# (the same as "broker_use_ssl")
ssl = _get('redis_backend_use_ssl')
if ssl:
self.connparams.update(ssl)
self.connparams['connection_class'] = redis.SSLConnection
if url:
self.connparams = self._params_from_url(url, self.connparams)
self.url = url
self.connection_errors, self.channel_errors = (
get_redis_error_classes() if get_redis_error_classes
else ((), ()))
self.result_consumer = self.ResultConsumer(
self, self.app, self.accept,
self._pending_results, self._pending_messages,
)
def _params_from_url(self, url, defaults):
scheme, host, port, _, password, path, query = _parse_url(url)
connparams = dict(
defaults, **dictfilter({
'host': host, 'port': port, 'password': password,
'db': query.pop('virtual_host', None)})
)
if scheme == 'socket':
# use 'path' as path to the socket… in this case
# the database number should be given in 'query'
connparams.update({
'connection_class': self.redis.UnixDomainSocketConnection,
'path': '/' + path,
})
# host+port are invalid options when using this connection type.
connparams.pop('host', None)
connparams.pop('port', None)
connparams.pop('socket_connect_timeout')
else:
connparams['db'] = path
# db may be string and start with / like in kombu.
db = connparams.get('db') or 0
db = db.strip('/') if isinstance(db, string_t) else db
connparams['db'] = int(db)
# Query parameters override other parameters
connparams.update(query)
return connparams
def on_task_call(self, producer, task_id):
if not task_join_will_block():
self.result_consumer.consume_from(task_id)
def get(self, key):
return self.client.get(key)
def mget(self, keys):
return self.client.mget(keys)
def ensure(self, fun, args, **policy):
retry_policy = dict(self.retry_policy, **policy)
max_retries = retry_policy.get('max_retries')
return retry_over_time(
fun, self.connection_errors, args, {},
partial(self.on_connection_error, max_retries),
**retry_policy)
def on_connection_error(self, max_retries, exc, intervals, retries):
tts = next(intervals)
logger.error(
E_LOST.strip(),
retries, max_retries or 'Inf', humanize_seconds(tts, 'in '))
return tts
def set(self, key, value, **retry_policy):
return self.ensure(self._set, (key, value), **retry_policy)
def _set(self, key, value):
with self.client.pipeline() as pipe:
if self.expires:
pipe.setex(key, self.expires, value)
else:
pipe.set(key, value)
pipe.publish(key, value)
pipe.execute()
def delete(self, key):
self.client.delete(key)
def incr(self, key):
return self.client.incr(key)
def expire(self, key, value):
return self.client.expire(key, value)
def add_to_chord(self, group_id, result):
self.client.incr(self.get_key_for_group(group_id, '.t'), 1)
def _unpack_chord_result(self, tup, decode,
EXCEPTION_STATES=states.EXCEPTION_STATES,
PROPAGATE_STATES=states.PROPAGATE_STATES):
_, tid, state, retval = decode(tup)
if state in EXCEPTION_STATES:
retval = self.exception_to_python(retval)
if state in PROPAGATE_STATES:
raise ChordError('Dependency {0} raised {1!r}'.format(tid, retval))
return retval
def apply_chord(self, header, partial_args, group_id, body,
result=None, options={}, **kwargs):
# Overrides this to avoid calling GroupResult.save
# pylint: disable=method-hidden
# Note that KeyValueStoreBackend.__init__ sets self.apply_chord
# if the implements_incr attr is set. Redis backend doesn't set
# this flag.
options['task_id'] = group_id
return header(*partial_args, **options or {})
def on_chord_part_return(self, request, state, result,
propagate=None, **kwargs):
app = self.app
tid, gid = request.id, request.group
if not gid or not tid:
return
client = self.client
jkey = self.get_key_for_group(gid, '.j')
tkey = self.get_key_for_group(gid, '.t')
result = self.encode_result(result, state)
with client.pipeline() as pipe:
_, readycount, totaldiff, _, _ = pipe \
.rpush(jkey, self.encode([1, tid, state, result])) \
.llen(jkey) \
.get(tkey) \
.expire(jkey, self.expires) \
.expire(tkey, self.expires) \
.execute()
totaldiff = int(totaldiff or 0)
try:
callback = maybe_signature(request.chord, app=app)
total = callback['chord_size'] + totaldiff
if readycount == total:
decode, unpack = self.decode, self._unpack_chord_result
with client.pipeline() as pipe:
resl, _, _ = pipe \
.lrange(jkey, 0, total) \
.delete(jkey) \
.delete(tkey) \
.execute()
try:
callback.delay([unpack(tup, decode) for tup in resl])
except Exception as exc: # pylint: disable=broad-except
logger.exception(
'Chord callback for %r raised: %r', request.group, exc)
return self.chord_error_from_stack(
callback,
ChordError('Callback error: {0!r}'.format(exc)),
)
except ChordError as exc:
logger.exception('Chord %r raised: %r', request.group, exc)
return self.chord_error_from_stack(callback, exc)
except Exception as exc: # pylint: disable=broad-except
logger.exception('Chord %r raised: %r', request.group, exc)
return self.chord_error_from_stack(
callback,
ChordError('Join error: {0!r}'.format(exc)),
)
def _create_client(self, **params):
return self.redis.StrictRedis(
connection_pool=self.ConnectionPool(**params),
)
@property
def ConnectionPool(self):
if self._ConnectionPool is None:
self._ConnectionPool = self.redis.ConnectionPool
return self._ConnectionPool
@cached_property
def client(self):
return self._create_client(**self.connparams)
def __reduce__(self, args=(), kwargs={}):
return super(RedisBackend, self).__reduce__(
(self.url,), {'expires': self.expires},
)
@deprecated.Property(4.0, 5.0)
def host(self):
return self.connparams['host']
@deprecated.Property(4.0, 5.0)
def port(self):
return self.connparams['port']
@deprecated.Property(4.0, 5.0)
def db(self):
return self.connparams['db']
@deprecated.Property(4.0, 5.0)
def password(self):
return self.connparams['password']
|