-
-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
redis.py
585 lines (485 loc) · 21.7 KB
/
redis.py
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
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
"""Redis result store backend."""
import time
from contextlib import contextmanager
from functools import partial
from ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
from urllib.parse import unquote
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.result import GroupResult, allow_join_result
from celery.utils.functional import dictfilter
from celery.utils.log import get_logger
from celery.utils.time import humanize_seconds
from .asynchronous import AsyncBackendMixin, BaseResultConsumer
from .base import BaseKeyValueStoreBackend
try:
import redis.connection
from kombu.transport.redis import get_redis_error_classes
except ImportError: # pragma: no cover
redis = None # noqa
get_redis_error_classes = None # noqa
try:
import redis.sentinel
except ImportError:
pass
__all__ = ('RedisBackend', 'SentinelBackend')
E_REDIS_MISSING = """
You need to install the redis library in order to use \
the Redis result store backend.
"""
E_REDIS_SENTINEL_MISSING = """
You need to install the redis library with support of \
sentinel in order to use the Redis result store backend.
"""
W_REDIS_SSL_CERT_OPTIONAL = """
Setting ssl_cert_reqs=CERT_OPTIONAL when connecting to redis means that \
celery might not valdate the identity of the redis broker when connecting. \
This leaves you vulnerable to man in the middle attacks.
"""
W_REDIS_SSL_CERT_NONE = """
Setting ssl_cert_reqs=CERT_NONE when connecting to redis means that celery \
will not valdate the identity of the redis broker when connecting. This \
leaves you vulnerable to man in the middle attacks.
"""
E_REDIS_SSL_PARAMS_AND_SCHEME_MISMATCH = """
SSL connection parameters have been provided but the specified URL scheme \
is redis://. A Redis SSL connection URL should use the scheme rediss://.
"""
E_REDIS_SSL_CERT_REQS_MISSING_INVALID = """
A rediss:// URL must have parameter ssl_cert_reqs and this must be set to \
CERT_REQUIRED, CERT_OPTIONAL, or CERT_NONE
"""
E_LOST = 'Connection to Redis lost: Retry (%s/%s) %s.'
E_RETRY_LIMIT_EXCEEDED = """
Retry limit exceeded while trying to reconnect to the Celery redis result \
store backend. The Celery application must be restarted.
"""
logger = get_logger(__name__)
class ResultConsumer(BaseResultConsumer):
_pubsub = None
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._get_key_for_task = self.backend.get_key_for_task
self._decode_result = self.backend.decode_result
self._ensure = self.backend.ensure
self._connection_errors = self.backend.connection_errors
self.subscribed_to = set()
def on_after_fork(self):
try:
self.backend.client.connection_pool.reset()
if self._pubsub is not None:
self._pubsub.close()
except KeyError as e:
logger.warning(str(e))
super().on_after_fork()
def _reconnect_pubsub(self):
self._pubsub = None
self.backend.client.connection_pool.reset()
# task state might have changed when the connection was down so we
# retrieve meta for all subscribed tasks before going into pubsub mode
metas = self.backend.client.mget(self.subscribed_to)
metas = [meta for meta in metas if meta]
for meta in metas:
self.on_state_change(self._decode_result(meta), None)
self._pubsub = self.backend.client.pubsub(
ignore_subscribe_messages=True,
)
self._pubsub.subscribe(*self.subscribed_to)
@contextmanager
def reconnect_on_error(self):
try:
yield
except self._connection_errors:
try:
self._ensure(self._reconnect_pubsub, ())
except self._connection_errors:
logger.critical(E_RETRY_LIMIT_EXCEEDED)
raise
def _maybe_cancel_ready_task(self, meta):
if meta['status'] in states.READY_STATES:
self.cancel_for(meta['task_id'])
def on_state_change(self, meta, message):
super().on_state_change(meta, message)
self._maybe_cancel_ready_task(meta)
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(**kwargs):
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):
if self._pubsub:
with self.reconnect_on_error():
message = self._pubsub.get_message(timeout=timeout)
if message and message['type'] == 'message':
self.on_state_change(self._decode_result(message['data']), message)
elif timeout:
time.sleep(timeout)
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)
with self.reconnect_on_error():
self._pubsub.subscribe(key)
def cancel_for(self, task_id):
key = self._get_key_for_task(task_id)
self.subscribed_to.discard(key)
if self._pubsub:
with self.reconnect_on_error():
self._pubsub.unsubscribe(key)
class RedisBackend(BaseKeyValueStoreBackend, AsyncBackendMixin):
"""Redis task result store.
It makes use of the following commands:
GET, MGET, DEL, INCRBY, EXPIRE, SET, SETEX
"""
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().__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')
retry_on_timeout = _get('redis_retry_on_timeout')
socket_keepalive = _get('redis_socket_keepalive')
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),
'retry_on_timeout': retry_on_timeout or False,
'socket_connect_timeout':
socket_connect_timeout and float(socket_connect_timeout),
}
# absent in redis.connection.UnixDomainSocketConnection
if socket_keepalive:
self.connparams['socket_keepalive'] = socket_keepalive
# "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)
# If we've received SSL parameters via query string or the
# redis_backend_use_ssl dict, check ssl_cert_reqs is valid. If set
# via query string ssl_cert_reqs will be a string so convert it here
if ('connection_class' in self.connparams and
self.connparams['connection_class'] is redis.SSLConnection):
ssl_cert_reqs_missing = 'MISSING'
ssl_string_to_constant = {'CERT_REQUIRED': CERT_REQUIRED,
'CERT_OPTIONAL': CERT_OPTIONAL,
'CERT_NONE': CERT_NONE,
'required': CERT_REQUIRED,
'optional': CERT_OPTIONAL,
'none': CERT_NONE}
ssl_cert_reqs = self.connparams.get('ssl_cert_reqs', ssl_cert_reqs_missing)
ssl_cert_reqs = ssl_string_to_constant.get(ssl_cert_reqs, ssl_cert_reqs)
if ssl_cert_reqs not in ssl_string_to_constant.values():
raise ValueError(E_REDIS_SSL_CERT_REQS_MISSING_INVALID)
if ssl_cert_reqs == CERT_OPTIONAL:
logger.warning(W_REDIS_SSL_CERT_OPTIONAL)
elif ssl_cert_reqs == CERT_NONE:
logger.warning(W_REDIS_SSL_CERT_NONE)
self.connparams['ssl_cert_reqs'] = ssl_cert_reqs
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
ssl_param_keys = ['ssl_ca_certs', 'ssl_certfile', 'ssl_keyfile',
'ssl_cert_reqs']
if scheme == 'redis':
# If connparams or query string contain ssl params, raise error
if (any(key in connparams for key in ssl_param_keys) or
any(key in query for key in ssl_param_keys)):
raise ValueError(E_REDIS_SSL_PARAMS_AND_SCHEME_MISMATCH)
if scheme == 'rediss':
connparams['connection_class'] = redis.SSLConnection
# The following parameters, if present in the URL, are encoded. We
# must add the decoded values to connparams.
for ssl_setting in ssl_param_keys:
ssl_val = query.pop(ssl_setting, None)
if ssl_val:
connparams[ssl_setting] = unquote(ssl_val)
# db may be string and start with / like in kombu.
db = connparams.get('db') or 0
db = db.strip('/') if isinstance(db, str) else db
connparams['db'] = int(db)
for key, value in query.items():
if key in redis.connection.URL_QUERY_ARGUMENT_PARSERS:
query[key] = redis.connection.URL_QUERY_ARGUMENT_PARSERS[key](
value
)
# Query parameters override other parameters
connparams.update(query)
return connparams
@cached_property
def retry_policy(self):
retry_policy = super().retry_policy
if "retry_policy" in self._transport_options:
retry_policy = retry_policy.copy()
retry_policy.update(self._transport_options['retry_policy'])
return retry_policy
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 forget(self, task_id):
super().forget(task_id)
self.result_consumer.cancel_for(task_id)
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(f'Dependency {tid} raised {retval!r}')
return retval
def apply_chord(self, header_result, body, **kwargs):
# If any of the child results of this chord are complex (ie. group
# results themselves), we need to save `header_result` to ensure that
# the expected structure is retained when we finish the chord and pass
# the results onward to the body in `on_chord_part_return()`. We don't
# do this is all cases to retain an optimisation in the common case
# where a chord header is comprised of simple result objects.
if any(isinstance(nr, GroupResult) for nr in header_result.results):
header_result.save(backend=self)
@cached_property
def _chord_zset(self):
return self._transport_options.get('result_chord_ordered', True)
@cached_property
def _transport_options(self):
return self.app.conf.get('result_backend_transport_options', {})
def on_chord_part_return(self, request, state, result,
propagate=None, **kwargs):
app = self.app
tid, gid, group_index = request.id, request.group, request.group_index
if not gid or not tid:
return
if group_index is None:
group_index = '+inf'
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)
encoded = self.encode([1, tid, state, result])
with client.pipeline() as pipe:
pipeline = (
pipe.zadd(jkey, {encoded: group_index}).zcount(jkey, "-inf", "+inf")
if self._chord_zset
else pipe.rpush(jkey, encoded).llen(jkey)
).get(tkey)
if self.expires:
pipeline = pipeline \
.expire(jkey, self.expires) \
.expire(tkey, self.expires)
_, readycount, totaldiff = pipeline.execute()[:3]
totaldiff = int(totaldiff or 0)
try:
callback = maybe_signature(request.chord, app=app)
total = callback['chord_size'] + totaldiff
if readycount == total:
hr = GroupResult.restore(gid)
if hr is not None:
# If we manage to restore a `GroupResult`, then it must
# have been complex and saved by `apply_chord()` earlier.
#
# Before we can join the `GroupResult`, it needs to be
# manually marked as ready to avoid blocking
hr.on_ready()
# We'll `join()` it to get the results and ensure they are
# structured as intended rather than the flattened version
# we'd construct without any other information.
j = hr.join_native if hr.supports_native_join else hr.join
with allow_join_result():
resl = j(timeout=3.0, propagate=True)
else:
# Otherwise simply extract and decode the results we
# stashed along the way, which should be faster for large
# numbers of simple results in the chord header.
decode, unpack = self.decode, self._unpack_chord_result
with client.pipeline() as pipe:
if self._chord_zset:
pipeline = pipe.zrange(jkey, 0, -1)
else:
pipeline = pipe.lrange(jkey, 0, total)
resl, = pipeline.execute()
resl = [unpack(tup, decode) for tup in resl]
try:
callback.delay(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(f'Callback error: {exc!r}'),
)
finally:
with client.pipeline() as pipe:
_, _ = pipe \
.delete(jkey) \
.delete(tkey) \
.execute()
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(f'Join error: {exc!r}'),
)
def _create_client(self, **params):
return self._get_client()(
connection_pool=self._get_pool(**params),
)
def _get_client(self):
return self.redis.StrictRedis
def _get_pool(self, **params):
return 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=None):
kwargs = {} if not kwargs else kwargs
return super().__reduce__(
(self.url,), {'expires': self.expires},
)
class SentinelBackend(RedisBackend):
"""Redis sentinel task result store."""
sentinel = getattr(redis, "sentinel", None)
def __init__(self, *args, **kwargs):
if self.sentinel is None:
raise ImproperlyConfigured(E_REDIS_SENTINEL_MISSING.strip())
super().__init__(*args, **kwargs)
def _params_from_url(self, url, defaults):
# URL looks like sentinel://0.0.0.0:26347/3;sentinel://0.0.0.0:26348/3.
chunks = url.split(";")
connparams = dict(defaults, hosts=[])
for chunk in chunks:
data = super()._params_from_url(
url=chunk, defaults=defaults)
connparams['hosts'].append(data)
for param in ("host", "port", "db", "password"):
connparams.pop(param)
# Adding db/password in connparams to connect to the correct instance
for param in ("db", "password"):
if connparams['hosts'] and param in connparams['hosts'][0]:
connparams[param] = connparams['hosts'][0].get(param)
return connparams
def _get_sentinel_instance(self, **params):
connparams = params.copy()
hosts = connparams.pop("hosts")
min_other_sentinels = self._transport_options.get("min_other_sentinels", 0)
sentinel_kwargs = self._transport_options.get("sentinel_kwargs", {})
sentinel_instance = self.sentinel.Sentinel(
[(cp['host'], cp['port']) for cp in hosts],
min_other_sentinels=min_other_sentinels,
sentinel_kwargs=sentinel_kwargs,
**connparams)
return sentinel_instance
def _get_pool(self, **params):
sentinel_instance = self._get_sentinel_instance(**params)
master_name = self._transport_options.get("master_name", None)
return sentinel_instance.master_for(
service_name=master_name,
redis_class=self._get_client(),
).connection_pool