def migrate_task(producer,
body_,
message,
remove_props=[
"application_headers", "content_type", "content_encoding"
]):
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info, message.headers,
message.properties)
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop("compression", None)
for key in remove_props:
props.pop(key, None)
producer.publish(ensure_bytes(body),
exchange=info["exchange"],
routing_key=info["routing_key"],
compression=compression,
headers=headers,
content_type=ctype,
content_encoding=enc,
**props)
def __init__(self, key, password=None):
with reraise_errors('Invalid private key: {0!r}',
errors=(ValueError, )):
self._key = serialization.load_pem_private_key(
ensure_bytes(key),
password=ensure_bytes(password),
backend=default_backend())
def _unpack(self, payload, sep=str_to_bytes('\x00\x01')):
values = b64decode(ensure_bytes(payload)).split(sep)
return {'signer': bytes_to_str(values[0]),
'signature': ensure_bytes(values[1]),
'content_type': bytes_to_str(values[2]),
'content_encoding': bytes_to_str(values[3]),
'body': ensure_bytes(values[4])}
def republish(producer,
message,
exchange=None,
routing_key=None,
remove_props=None):
"""Republish message."""
if not remove_props:
remove_props = [
"application_headers",
"content_type",
"content_encoding",
"headers",
]
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info, message.headers,
message.properties)
exchange = info["exchange"] if exchange is None else exchange
routing_key = info["routing_key"] if routing_key is None else routing_key
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop("compression", None)
for key in remove_props:
props.pop(key, None)
producer.publish(ensure_bytes(body),
exchange=exchange,
routing_key=routing_key,
compression=compression,
headers=headers,
content_type=ctype,
content_encoding=enc,
**props)
def republish(producer,
message,
exchange=None,
routing_key=None,
remove_props=[
'application_headers', 'content_type', 'content_encoding',
'headers'
]):
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info, message.headers,
message.properties)
exchange = info['exchange'] if exchange is None else exchange
routing_key = info['routing_key'] if routing_key is None else routing_key
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop('compression', None)
for key in remove_props:
props.pop(key, None)
producer.publish(ensure_bytes(body),
exchange=exchange,
routing_key=routing_key,
compression=compression,
headers=headers,
content_type=ctype,
content_encoding=enc,
**props)
def migrate_task(producer, body_, message, queues=None,
remove_props=['application_headers',
'content_type',
'content_encoding',
'headers']):
queues = {} if queues is None else queues
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info,
message.headers,
message.properties)
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop('compression', None)
for key in remove_props:
props.pop(key, None)
exchange = queues.get(info['exchange'], info['exchange'])
routing_key = queues.get(info['routing_key'], info['routing_key'])
producer.publish(ensure_bytes(body), exchange=exchange,
routing_key=routing_key,
compression=compression,
headers=headers,
content_type=ctype,
content_encoding=enc,
**props)
def test_get_result_meta_encoded(self):
self.app.conf.result_extended = True
b1 = BaseBackend(self.app)
args = ['a', 'b']
kwargs = {'foo': 'bar'}
request = Context(args=args, kwargs=kwargs)
meta = b1._get_result_meta(result={'fizz': 'buzz'},
state=states.SUCCESS, traceback=None,
request=request, encode=True)
assert meta['args'] == ensure_bytes(b1.encode(args))
assert meta['kwargs'] == ensure_bytes(b1.encode(kwargs))
def test_migrate(self, app, name='testcelery'):
connection_kwargs = {'transport_options': {'polling_interval': 0.01}}
x = Connection('memory://foo', **connection_kwargs)
y = Connection('memory://foo', **connection_kwargs)
# use separate state
x.default_channel.queues = {}
y.default_channel.queues = {}
ex = Exchange(name, 'direct')
q = Queue(name, exchange=ex, routing_key=name)
q(x.default_channel).declare()
Producer(x).publish('foo', exchange=name, routing_key=name)
Producer(x).publish('bar', exchange=name, routing_key=name)
Producer(x).publish('baz', exchange=name, routing_key=name)
assert x.default_channel.queues
assert not y.default_channel.queues
migrate_tasks(x, y, accept=['text/plain'], app=app)
yq = q(y.default_channel)
assert yq.get().body == ensure_bytes('foo')
assert yq.get().body == ensure_bytes('bar')
assert yq.get().body == ensure_bytes('baz')
Producer(x).publish('foo', exchange=name, routing_key=name)
callback = Mock()
migrate_tasks(x, y, callback=callback, accept=['text/plain'], app=app)
callback.assert_called()
migrate = Mock()
Producer(x).publish('baz', exchange=name, routing_key=name)
migrate_tasks(x,
y,
callback=callback,
migrate=migrate,
accept=['text/plain'],
app=app)
migrate.assert_called()
with patch('kombu.transport.virtual.Channel.queue_declare') as qd:
def effect(*args, **kwargs):
if kwargs.get('passive'):
raise ChannelError('some channel error')
return 0, 3, 0
qd.side_effect = effect
migrate_tasks(x, y, app=app)
x = Connection('memory://', **connection_kwargs)
x.default_channel.queues = {}
y.default_channel.queues = {}
callback = Mock()
migrate_tasks(x, y, callback=callback, accept=['text/plain'], app=app)
callback.assert_not_called()
def _unpack(self, payload, sep=str_to_bytes('\x00\x01')):
raw_payload = b64decode(ensure_bytes(payload))
first_sep = raw_payload.find(sep)
signer = raw_payload[:first_sep]
signer_cert = self._cert_store[signer]
sig_len = signer_cert._cert.get_pubkey().bits() >> 3
signature = raw_payload[
first_sep + len(sep):first_sep + len(sep) + sig_len
]
end_of_sig = first_sep + len(sep) + sig_len+len(sep)
v = raw_payload[end_of_sig:].split(sep)
values = [bytes_to_str(signer), bytes_to_str(signature),
bytes_to_str(v[0]), bytes_to_str(v[1]), bytes_to_str(v[2])]
return {
'signer': values[0],
'signature': values[1],
'content_type': values[2],
'content_encoding': values[3],
'body': values[4],
}
def _unpack(self, payload, sep=str_to_bytes('\x00\x01')):
raw_payload = b64decode(ensure_bytes(payload))
first_sep = raw_payload.find(sep)
signer = raw_payload[:first_sep]
signer_cert = self._cert_store[signer]
# shift 3 bits right to get signature length
# 2048bit rsa key has a signature length of 256
# 4096bit rsa key has a signature length of 512
sig_len = signer_cert.get_pubkey().key_size >> 3
sep_len = len(sep)
signature_start_position = first_sep + sep_len
signature_end_position = signature_start_position + sig_len
signature = raw_payload[
signature_start_position:signature_end_position]
v = raw_payload[signature_end_position + sep_len:].split(sep)
return {
'signer': signer,
'signature': signature,
'content_type': bytes_to_str(v[0]),
'content_encoding': bytes_to_str(v[1]),
'body': v[2],
}
def _get_result_meta(self,
result,
state,
traceback,
request,
format_date=True,
encode=False):
if state in self.READY_STATES:
date_done = datetime.utcnow()
if format_date:
date_done = date_done.isoformat()
else:
date_done = None
meta = {
'status': state,
'result': result,
'traceback': traceback,
'children': self.current_task_children(request),
'date_done': date_done,
}
if request and getattr(request, 'group', None):
meta['group_id'] = request.group
if request and getattr(request, 'parent_id', None):
meta['parent_id'] = request.parent_id
if self.app.conf.find_value_for_key('extended', 'result'):
if request:
request_meta = {
'name':
getattr(request, 'task', None),
'args':
getattr(request, 'args', None),
'kwargs':
getattr(request, 'kwargs', None),
'worker':
getattr(request, 'hostname', None),
'retries':
getattr(request, 'retries', None),
'queue':
request.delivery_info.get('routing_key')
if hasattr(request, 'delivery_info')
and request.delivery_info else None,
}
if getattr(request, 'stamps'):
request_meta['stamped_headers'] = request.stamped_headers
request_meta.update(request.stamps)
if encode:
# args and kwargs need to be encoded properly before saving
encode_needed_fields = {"args", "kwargs"}
for field in encode_needed_fields:
value = request_meta[field]
encoded_value = self.encode(value)
request_meta[field] = ensure_bytes(encoded_value)
meta.update(request_meta)
return meta
def _strip_prefix(self, key):
"""Takes bytes, emits string."""
key = ensure_bytes(key)
for prefix in self.task_keyprefix, self.group_keyprefix:
if key.startswith(prefix):
return bytes_to_str(key[len(prefix):])
return bytes_to_str(key)
def _pack(self, body, content_type, content_encoding, signer, signature,
sep=str_to_bytes('\x00\x01')):
fields = sep.join(
ensure_bytes(s) for s in [signer, signature, content_type,
content_encoding, body]
)
return b64encode(fields)
def _unpack(self, payload, sep=str_to_bytes('\x00\x01')):
raw_payload = b64decode(ensure_bytes(payload))
first_sep = raw_payload.find(sep)
signer = raw_payload[:first_sep]
signer_cert = self._cert_store[signer]
sig_len = signer_cert._cert.get_pubkey().bits() >> 3
signature = raw_payload[first_sep + len(sep):first_sep + len(sep) +
sig_len]
end_of_sig = first_sep + len(sep) + sig_len + len(sep)
v = raw_payload[end_of_sig:].split(sep)
values = [
bytes_to_str(signer),
bytes_to_str(signature),
bytes_to_str(v[0]),
bytes_to_str(v[1]),
bytes_to_str(v[2])
]
return {
'signer': values[0],
'signature': values[1],
'content_type': values[2],
'content_encoding': values[3],
'body': values[4],
}
def _strip_prefix(self, key):
"""Takes bytes, emits string."""
key = ensure_bytes(key)
for prefix in self.task_keyprefix, self.group_keyprefix:
if key.startswith(prefix):
return bytes_to_str(key[len(prefix):])
return bytes_to_str(key)
def _unpack(self, payload, sep=str_to_bytes('\x00\x01')):
raw_payload = b64decode(ensure_bytes(payload))
first_sep = raw_payload.find(sep)
signer = raw_payload[:first_sep]
signer_cert = self._cert_store[signer]
# shift 3 bits right to get signature length
# 2048bit rsa key has a signature length of 256
# 4096bit rsa key has a signature length of 512
sig_len = signer_cert.get_pubkey().key_size >> 3
sep_len = len(sep)
signature_start_position = first_sep + sep_len
signature_end_position = signature_start_position + sig_len
signature = raw_payload[
signature_start_position:signature_end_position
]
v = raw_payload[signature_end_position + sep_len:].split(sep)
return {
'signer': signer,
'signature': signature,
'content_type': bytes_to_str(v[0]),
'content_encoding': bytes_to_str(v[1]),
'body': bytes_to_str(v[2]),
}
def _pack(self, body, content_type, content_encoding, signer, signature,
sep=str_to_bytes('\x00\x01')):
fields = sep.join(
ensure_bytes(s) for s in [signer, signature, content_type,
content_encoding, body]
)
return b64encode(fields)
def __init__(self, key, password=None):
with reraise_errors(
'Invalid private key: {0!r}', errors=(ValueError,)
):
self._key = serialization.load_pem_private_key(
ensure_bytes(key),
password=password,
backend=default_backend())
def sign(self, data, digest):
"""Sign string containing data."""
with reraise_errors('Unable to sign data: {0!r}'):
padd = padding.PSS(mgf=padding.MGF1(digest),
salt_length=padding.PSS.MAX_LENGTH)
return self._key.sign(ensure_bytes(data), padd, digest)
def _get_result_meta(self,
result,
state,
traceback,
request,
format_date=True,
encode=False):
if state in self.READY_STATES:
date_done = datetime.utcnow()
if format_date:
date_done = date_done.isoformat()
else:
date_done = None
meta = {
"status": state,
"result": result,
"traceback": traceback,
"children": self.current_task_children(request),
"date_done": date_done,
}
if request and getattr(request, "group", None):
meta["group_id"] = request.group
if request and getattr(request, "parent_id", None):
meta["parent_id"] = request.parent_id
if self.app.conf.find_value_for_key("extended", "result"):
if request:
request_meta = {
"name":
getattr(request, "task", None),
"args":
getattr(request, "args", None),
"kwargs":
getattr(request, "kwargs", None),
"worker":
getattr(request, "hostname", None),
"retries":
getattr(request, "retries", None),
"queue":
request.delivery_info.get("routing_key")
if hasattr(request, "delivery_info")
and request.delivery_info else None,
}
if encode:
# args and kwargs need to be encoded properly before saving
encode_needed_fields = {"args", "kwargs"}
for field in encode_needed_fields:
value = request_meta[field]
encoded_value = self.encode(value)
request_meta[field] = ensure_bytes(encoded_value)
meta.update(request_meta)
return meta
def compress(body, content_type):
"""Compress text.
Arguments:
body (AnyStr): The text to compress.
content_type (str): mime-type of compression method to use.
"""
encoder, content_type = get_encoder(content_type)
return encoder(ensure_bytes(body)), content_type
def verify(self, data, signature, digest):
"""Verify signature for string containing data."""
with reraise_errors("Bad signature: {0!r}"):
padd = padding.PSS(mgf=padding.MGF1(digest),
salt_length=padding.PSS.MAX_LENGTH)
self.get_pubkey().verify(signature, ensure_bytes(data), padd,
digest)
def compress(body, content_type):
"""Compress text.
:param body: The text to compress.
:param content_type: mime-type of compression method to use.
"""
encoder, content_type = get_encoder(content_type)
return encoder(ensure_bytes(body)), content_type
def sign(self, data, digest):
"""Sign string containing data."""
with reraise_errors('Unable to sign data: {0!r}'):
padd = padding.PSS(
mgf=padding.MGF1(digest),
salt_length=padding.PSS.MAX_LENGTH)
return self._key.sign(ensure_bytes(data), padd, digest)
def compress(body, content_type):
"""Compress text.
:param body: The text to compress.
:param content_type: mime-type of compression method to use.
"""
encoder, content_type = get_encoder(content_type)
return encoder(ensure_bytes(body)), content_type
def compress(body, content_type):
"""Compress text.
Arguments:
body (AnyStr): The text to compress.
content_type (str): mime-type of compression method to use.
"""
encoder, content_type = get_encoder(content_type)
return encoder(ensure_bytes(body)), content_type
def _save_group(self, group_id, result):
"""Store the result of an executed group."""
session = self.ResultSession()
with session_cleanup(session):
group = TaskSet(group_id, ensure_bytes(self.encode(result)))
session.add(group)
session.flush()
session.commit()
return result
def verify(self, data, signature, digest):
"""Verify signature for string containing data."""
with reraise_errors('Bad signature: {0!r}'):
padd = padding.PSS(
mgf=padding.MGF1(digest),
salt_length=padding.PSS.MAX_LENGTH)
self.get_pubkey().verify(signature,
ensure_bytes(data), padd, digest)
def __inner(*args, **kwargs):
for module in modules:
if isinstance(module, string_t):
if not PY3:
module = ensure_bytes(module)
module = types.ModuleType(module)
sys.modules[module.__name__] = module
try:
return fun(*args, **kwargs)
finally:
sys.modules.pop(module.__name__, None)
def _update_result(self, task, result, state, traceback=None,
request=None):
task.result = result
task.status = state
task.traceback = traceback
if self.app.conf.find_value_for_key('extended', 'result'):
task.name = getattr(request, 'task_name', None)
task.args = ensure_bytes(
self.encode(getattr(request, 'args', None))
)
task.kwargs = ensure_bytes(
self.encode(getattr(request, 'kwargs', None))
)
task.worker = getattr(request, 'hostname', None)
task.retries = getattr(request, 'retries', None)
task.queue = (
request.delivery_info.get("routing_key")
if hasattr(request, "delivery_info") and request.delivery_info
else None
)
def republish(producer, message, exchange=None, routing_key=None,
remove_props=['application_headers',
'content_type',
'content_encoding',
'headers']):
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info,
message.headers, message.properties)
exchange = info['exchange'] if exchange is None else exchange
routing_key = info['routing_key'] if routing_key is None else routing_key
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop('compression', None)
for key in remove_props:
props.pop(key, None)
producer.publish(ensure_bytes(body), exchange=exchange,
routing_key=routing_key, compression=compression,
headers=headers, content_type=ctype,
content_encoding=enc, **props)
def migrate_task(producer, body_, message,
remove_props=["application_headers",
"content_type",
"content_encoding"]):
body = ensure_bytes(message.body) # use raw message body.
info, headers, props = (message.delivery_info,
message.headers,
message.properties)
ctype, enc = message.content_type, message.content_encoding
# remove compression header, as this will be inserted again
# when the message is recompressed.
compression = headers.pop("compression", None)
for key in remove_props:
props.pop(key, None)
producer.publish(ensure_bytes(body), exchange=info["exchange"],
routing_key=info["routing_key"],
compression=compression,
headers=headers,
content_type=ctype,
content_encoding=enc,
**props)
def serialize(self, data):
"""Serialize data structure into string."""
assert self._key is not None
assert self._cert is not None
with reraise_errors('Unable to serialize: {0!r}', (Exception,)):
content_type, content_encoding, body = dumps(
bytes_to_str(data), serializer=self._serializer)
# What we sign is the serialized body, not the body itself.
# this way the receiver doesn't have to decode the contents
# to verify the signature (and thus avoiding potential flaws
# in the decoding step).
body = ensure_bytes(body)
return self._pack(body, content_type, content_encoding,
signature=self._key.sign(body, self._digest),
signer=self._cert.get_id())
def serialize(self, data):
"""serialize data structure into string"""
assert self._key is not None
assert self._cert is not None
with reraise_errors('Unable to serialize: {0!r}', (Exception, )):
content_type, content_encoding, body = encode(
data, serializer=self._serializer)
# What we sign is the serialized body, not the body itself.
# this way the receiver doesn't have to decode the contents
# to verify the signature (and thus avoiding potential flaws
# in the decoding step).
body = ensure_bytes(body)
return self._pack(body, content_type, content_encoding,
signature=self._key.sign(body, self._digest),
signer=self._cert.get_id())
def _store_result(self, task_id, result, state,
traceback=None, max_retries=3, **kwargs):
"""Store return value and state of an executed task."""
session = self.ResultSession()
with session_cleanup(session):
task = list(session.query(Task).filter(Task.task_id == task_id))
task = task and task[0]
if not task:
task = Task(task_id)
session.add(task)
session.flush()
task.result = ensure_bytes(self.encode(result))
task.status = state
task.traceback = traceback
session.commit()
return result
def __inner(*args, **kwargs):
gen = []
for module in modules:
if isinstance(module, string_t):
if not PY3:
module = ensure_bytes(module)
module = types.ModuleType(module)
gen.append(module)
sys.modules[module.__name__] = module
name = module.__name__
if '.' in name:
parent, _, attr = name.rpartition('.')
setattr(sys.modules[parent], attr, module)
try:
return fun(*args, **kwargs)
finally:
for module in gen:
sys.modules.pop(module.__name__, None)
def __inner(*args, **kwargs):
gen = []
for module in modules:
if isinstance(module, string_t):
if not PY3:
module = ensure_bytes(module)
module = types.ModuleType(module)
gen.append(module)
sys.modules[module.__name__] = module
name = module.__name__
if '.' in name:
parent, _, attr = name.rpartition('.')
setattr(sys.modules[parent], attr, module)
try:
return fun(*args, **kwargs)
finally:
for module in gen:
sys.modules.pop(module.__name__, None)
def _unpack(self, payload, sep=str_to_bytes("\x00\x01")):
raw_payload = b64decode(ensure_bytes(payload))
first_sep = raw_payload.find(sep)
signer = raw_payload[:first_sep]
signer_cert = self._cert_store[signer]
sig_len = signer_cert._cert.get_pubkey().bits() >> 3
signature = raw_payload[first_sep + len(sep) : first_sep + len(sep) + sig_len]
end_of_sig = first_sep + len(sep) + sig_len + len(sep)
v = raw_payload[end_of_sig:].split(sep)
return {
"signer": signer,
"signature": signature,
"content_type": bytes_to_str(v[0]),
"content_encoding": bytes_to_str(v[1]),
"body": bytes_to_str(v[2]),
}
def serialize(self, data):
content_type, content_encoding, body = dumps(
bytes_to_str(data), serializer=self._serializer)
return b64encode(self.encrypt(ensure_bytes(body)))
def file_hash(filename, algorithm='md5'):
hobj = hashlib.new(algorithm)
with open(filename, 'rb') as f:
for chunk in iter(lambda: f.read(2**20), ''):
hobj.update(ensure_bytes(chunk))
return hobj.digest()
def sign(self, data, digest):
"""Sign string containing data."""
with reraise_errors('Unable to sign data: {0!r}'):
return crypto.sign(self._key, ensure_bytes(data), digest)
def test_sign(self):
pkey = PrivateKey(KEY1)
pkey.sign(ensure_bytes('test'), get_digest_algorithm())
with pytest.raises(AttributeError):
pkey.sign(ensure_bytes('test'), get_digest_algorithm('unknown'))
def get_key_for_chord(self, group_id):
"""Get the cache key for the chord waiting on group with given id."""
return self.chord_keyprefix + ensure_bytes(group_id)
def get_key_for_chord(self, group_id):
"""Get the cache key for the chord waiting on group with given id."""
return self.chord_keyprefix + ensure_bytes(group_id)
def get_key_for_group(self, group_id):
"""Get the cache key for a group by id."""
return self.group_keyprefix + ensure_bytes(group_id)
def get_key_for_task(self, task_id):
"""Get the cache key for a task by id."""
return self.task_keyprefix + ensure_bytes(task_id)
class KeyValueStoreBackend(BaseBackend):
task_keyprefix = ensure_bytes('celery-task-meta-')
group_keyprefix = ensure_bytes('celery-taskset-meta-')
chord_keyprefix = ensure_bytes('chord-unlock-')
implements_incr = False
def get(self, key):
raise NotImplementedError('Must implement the get method.')
def mget(self, keys):
raise NotImplementedError('Does not support get_many')
def set(self, key, value):
raise NotImplementedError('Must implement the set method.')
def delete(self, key):
raise NotImplementedError('Must implement the delete method')
def incr(self, key):
raise NotImplementedError('Does not implement incr')
def expire(self, key, value):
pass
def get_key_for_task(self, task_id):
"""Get the cache key for a task by id."""
return self.task_keyprefix + ensure_bytes(task_id)
def get_key_for_group(self, group_id):
"""Get the cache key for a group by id."""
return self.group_keyprefix + ensure_bytes(group_id)
def get_key_for_chord(self, group_id):
"""Get the cache key for the chord waiting on group with given id."""
return self.chord_keyprefix + ensure_bytes(group_id)
def _strip_prefix(self, key):
"""Takes bytes, emits string."""
key = ensure_bytes(key)
for prefix in self.task_keyprefix, self.group_keyprefix:
if key.startswith(prefix):
return bytes_to_str(key[len(prefix):])
return bytes_to_str(key)
def _mget_to_results(self, values, keys):
if hasattr(values, 'items'):
# client returns dict so mapping preserved.
return dict((self._strip_prefix(k), self.decode(v))
for k, v in items(values) if v is not None)
else:
# client returns list so need to recreate mapping.
return dict((bytes_to_str(keys[i]), self.decode(value))
for i, value in enumerate(values) if value is not None)
def get_many(self,
task_ids,
timeout=None,
interval=0.5,
READY_STATES=states.READY_STATES):
interval = 0.5 if interval is None else interval
ids = task_ids if isinstance(task_ids, set) else set(task_ids)
cached_ids = set()
cache = self._cache
for task_id in ids:
try:
cached = cache[task_id]
except KeyError:
pass
else:
if cached['status'] in READY_STATES:
yield bytes_to_str(task_id), cached
cached_ids.add(task_id)
ids.difference_update(cached_ids)
iterations = 0
while ids:
keys = list(ids)
r = self._mget_to_results(
self.mget([self.get_key_for_task(k) for k in keys]), keys)
cache.update(r)
ids.difference_update(set(bytes_to_str(v) for v in r))
for key, value in items(r):
yield bytes_to_str(key), value
if timeout and iterations * interval >= timeout:
raise TimeoutError('Operation timed out ({0})'.format(timeout))
time.sleep(interval) # don't busy loop.
iterations += 1
def _forget(self, task_id):
self.delete(self.get_key_for_task(task_id))
def _store_result(self,
task_id,
result,
status,
traceback=None,
request=None,
**kwargs):
meta = {
'status': status,
'result': result,
'traceback': traceback,
'children': self.current_task_children(request)
}
self.set(self.get_key_for_task(task_id), self.encode(meta))
return result
def _save_group(self, group_id, result):
self.set(self.get_key_for_group(group_id),
self.encode({'result': result.serializable()}))
return result
def _delete_group(self, group_id):
self.delete(self.get_key_for_group(group_id))
def _get_task_meta_for(self, task_id):
"""Get task metadata for a task by id."""
meta = self.get(self.get_key_for_task(task_id))
if not meta:
return {'status': states.PENDING, 'result': None}
return self.decode(meta)
def _restore_group(self, group_id):
"""Get task metadata for a task by id."""
meta = self.get(self.get_key_for_group(group_id))
# previously this was always pickled, but later this
# was extended to support other serializers, so the
# structure is kind of weird.
if meta:
meta = self.decode(meta)
result = meta['result']
meta['result'] = from_serializable(result, self.app)
return meta
def on_chord_apply(self, group_id, body, result=None, **kwargs):
if self.implements_incr:
self.save_group(group_id, self.app.GroupResult(group_id, result))
else:
self.fallback_chord_unlock(group_id, body, result, **kwargs)
def on_chord_part_return(self, task, propagate=None):
if not self.implements_incr:
return
from celery import maybe_signature
from celery.result import GroupResult
app = self.app
if propagate is None:
propagate = self.app.conf.CELERY_CHORD_PROPAGATES
gid = task.request.group
if not gid:
return
key = self.get_key_for_chord(gid)
try:
deps = GroupResult.restore(gid, backend=task.backend)
except Exception as exc:
callback = maybe_signature(task.request.chord, app=self.app)
return app._tasks[callback.task].backend.fail_from_current_stack(
callback.id,
exc=ChordError('Cannot restore group: {0!r}'.format(exc)),
)
if deps is None:
try:
raise ValueError(gid)
except ValueError as exc:
callback = maybe_signature(task.request.chord, app=self.app)
task = app._tasks[callback.task]
return task.backend.fail_from_current_stack(
callback.id,
exc=ChordError('GroupResult {0} no longer exists'.format(
gid, )))
val = self.incr(key)
if val >= len(deps):
callback = maybe_signature(task.request.chord, app=self.app)
j = deps.join_native if deps.supports_native_join else deps.join
try:
ret = j(propagate=propagate)
except Exception as exc:
try:
culprit = next(deps._failed_join_report())
reason = 'Dependency {0.id} raised {1!r}'.format(
culprit,
exc,
)
except StopIteration:
reason = repr(exc)
app._tasks[callback.task].backend.fail_from_current_stack(
callback.id,
exc=ChordError(reason),
)
else:
try:
callback.delay(ret)
except Exception as exc:
app._tasks[callback.task].backend.fail_from_current_stack(
callback.id,
exc=ChordError('Callback error: {0!r}'.format(exc)),
)
finally:
deps.delete()
self.client.delete(key)
else:
self.expire(key, 86400)
def set(self, key, value):
with self.open(self._filename(key), 'wb') as outfile:
outfile.write(ensure_bytes(value))
def set(self, key, value):
with self.open(self._filename(key), 'wb') as outfile:
outfile.write(ensure_bytes(value))
def sign(self, data, digest):
"""sign string containing data."""
with reraise_errors('Unable to sign data: {0!r}'):
return crypto.sign(self._key, ensure_bytes(data), digest)
def get_key_for_task(self, task_id):
"""Get the cache key for a task by id."""
return self.task_keyprefix + ensure_bytes(task_id)
def get_key_for_group(self, group_id):
"""Get the cache key for a group by id."""
return self.group_keyprefix + ensure_bytes(group_id)
def file_hash(filename, algorithm='md5'):
hobj = hashlib.new(algorithm)
with open(filename, 'rb') as f:
for chunk in iter(lambda: f.read(2 ** 20), ''):
hobj.update(ensure_bytes(chunk))
return hobj.digest()
def _put(self, queue, message, **kwargs):
return self._get_queue(queue).put(
ensure_bytes(dumps(message)),
priority=self._get_message_priority(message, reverse=True),
)
def get_key_for_chord(self, taskset_id):
"""Get the cache key for the chord waiting on taskset with given id."""
return self.chord_keyprefix + ensure_bytes(taskset_id)
class KeyValueStoreBackend(BaseBackend):
task_keyprefix = ensure_bytes('celery-task-meta-')
group_keyprefix = ensure_bytes('celery-taskset-meta-')
chord_keyprefix = ensure_bytes('chord-unlock-')
implements_incr = False
def get(self, key):
raise NotImplementedError('Must implement the get method.')
def mget(self, keys):
raise NotImplementedError('Does not support get_many')
def set(self, key, value):
raise NotImplementedError('Must implement the set method.')
def delete(self, key):
raise NotImplementedError('Must implement the delete method')
def incr(self, key):
raise NotImplementedError('Does not implement incr')
def expire(self, key, value):
pass
def get_key_for_task(self, task_id):
"""Get the cache key for a task by id."""
return self.task_keyprefix + ensure_bytes(task_id)
def get_key_for_group(self, group_id):
"""Get the cache key for a group by id."""
return self.group_keyprefix + ensure_bytes(group_id)
def get_key_for_chord(self, group_id):
"""Get the cache key for the chord waiting on group with given id."""
return self.chord_keyprefix + ensure_bytes(group_id)
def _strip_prefix(self, key):
"""Takes bytes, emits string."""
key = ensure_bytes(key)
for prefix in self.task_keyprefix, self.group_keyprefix:
if key.startswith(prefix):
return bytes_to_str(key[len(prefix):])
return bytes_to_str(key)
def _mget_to_results(self, values, keys):
if hasattr(values, 'items'):
# client returns dict so mapping preserved.
return dict((self._strip_prefix(k), self.decode(v))
for k, v in items(values)
if v is not None)
else:
# client returns list so need to recreate mapping.
return dict((bytes_to_str(keys[i]), self.decode(value))
for i, value in enumerate(values)
if value is not None)
def get_many(self, task_ids, timeout=None, interval=0.5):
ids = set(task_ids)
cached_ids = set()
for task_id in ids:
try:
cached = self._cache[task_id]
except KeyError:
pass
else:
if cached['status'] in states.READY_STATES:
yield bytes_to_str(task_id), cached
cached_ids.add(task_id)
ids.difference_update(cached_ids)
iterations = 0
while ids:
keys = list(ids)
r = self._mget_to_results(self.mget([self.get_key_for_task(k)
for k in keys]), keys)
self._cache.update(r)
ids.difference_update(set(map(bytes_to_str, r)))
for key, value in items(r):
yield bytes_to_str(key), value
if timeout and iterations * interval >= timeout:
raise TimeoutError('Operation timed out ({0})'.format(timeout))
time.sleep(interval) # don't busy loop.
iterations += 1
def _forget(self, task_id):
self.delete(self.get_key_for_task(task_id))
def _store_result(self, task_id, result, status, traceback=None):
meta = {'status': status, 'result': result, 'traceback': traceback,
'children': self.current_task_children()}
self.set(self.get_key_for_task(task_id), self.encode(meta))
return result
def _save_group(self, group_id, result):
self.set(self.get_key_for_group(group_id),
self.encode({'result': result.serializable()}))
return result
def _delete_group(self, group_id):
self.delete(self.get_key_for_group(group_id))
def _get_task_meta_for(self, task_id):
"""Get task metadata for a task by id."""
meta = self.get(self.get_key_for_task(task_id))
if not meta:
return {'status': states.PENDING, 'result': None}
return self.decode(meta)
def _restore_group(self, group_id):
"""Get task metadata for a task by id."""
meta = self.get(self.get_key_for_group(group_id))
# previously this was always pickled, but later this
# was extended to support other serializers, so the
# structure is kind of weird.
if meta:
meta = self.decode(meta)
result = meta['result']
if isinstance(result, (list, tuple)):
return {'result': from_serializable(result)}
return meta
def on_chord_apply(self, group_id, body, result=None, **kwargs):
if self.implements_incr:
self.app.GroupResult(group_id, result).save()
else:
self.fallback_chord_unlock(group_id, body, result, **kwargs)
def on_chord_part_return(self, task, propagate=False):
if not self.implements_incr:
return
from celery import subtask
from celery.result import GroupResult
gid = task.request.group
if not gid:
return
key = self.get_key_for_chord(gid)
deps = GroupResult.restore(gid, backend=task.backend)
if deps is None:
return
val = self.incr(key)
if val >= len(deps):
subtask(task.request.chord).delay(deps.join(propagate=propagate))
deps.delete()
self.client.delete(key)
else:
self.expire(key, 86400)
def __init__(self, cert):
with reraise_errors(
'Invalid certificate: {0!r}', errors=(ValueError,)
):
self._cert = load_pem_x509_certificate(
ensure_bytes(cert), backend=default_backend())