def create(self, queue, subscriber, ttl, options, project=None):
member_key = utils.scope_subscribers_set(queue, project,
SUBSCRIBERS_SUFFIX)
if self._client.sismember(member_key, subscriber):
return None
subscription_id = str(uuid.uuid4())
subset_key = utils.scope_subscription_ids_set(queue,
project,
SUBSCRIPTION_IDS_SUFFIX)
source = queue
now = timeutils.utcnow_ts()
ttl = int(ttl)
expires = now + ttl
subscription = {'id': subscription_id,
's': source,
'u': subscriber,
't': ttl,
'e': expires,
'o': self._packer(options),
'p': project}
if not self._queue_ctrl.exists(queue, project):
raise errors.QueueDoesNotExist(queue, project)
try:
# Pipeline ensures atomic inserts.
with self._client.pipeline() as pipe:
pipe.sadd(member_key, subscriber)
pipe.zadd(subset_key, 1,
subscription_id).hmset(subscription_id, subscription)
pipe.execute()
return subscription_id
except redis.exceptions.ResponseError:
return None
def delete(self, queue, subscription_id, project=None):
subset_key = utils.scope_subscription_ids_set(queue, project,
SUBSCRIPTION_IDS_SUFFIX)
member_key = utils.scope_subscribers_set(queue, project,
SUBSCRIBERS_SUFFIX)
subscriber = self._client.hget(subscription_id, 'u')
# NOTE(prashanthr_): Pipelining is used to mitigate race conditions
with self._client.pipeline() as pipe:
pipe.srem(member_key, subscriber)
pipe.zrem(subset_key, subscription_id)
pipe.delete(subscription_id)
pipe.execute()
def delete(self, queue, subscription_id, project=None):
subset_key = utils.scope_subscription_ids_set(queue, project,
SUBSCRIPTION_IDS_SUFFIX)
member_key = utils.scope_subscribers_set(queue, project,
SUBSCRIBERS_SUFFIX)
subscriber = self._client.hget(subscription_id, 'u')
# NOTE(prashanthr_): Pipelining is used to mitigate race conditions
with self._client.pipeline() as pipe:
pipe.srem(member_key, subscriber)
pipe.zrem(subset_key, subscription_id)
pipe.delete(subscription_id)
pipe.execute()
def create(self, queue, subscriber, ttl, options, project=None):
member_key = utils.scope_subscribers_set(queue, project,
SUBSCRIBERS_SUFFIX)
if self._client.sismember(member_key, subscriber):
return None
subscription_id = str(uuid.uuid4())
subset_key = utils.scope_subscription_ids_set(queue, project,
SUBSCRIPTION_IDS_SUFFIX)
source = queue
now = timeutils.utcnow_ts()
ttl = int(ttl)
expires = now + ttl
subscription = {
'id': subscription_id,
's': source,
'u': subscriber,
't': ttl,
'e': expires,
'o': self._packer(options),
'p': project
}
if not self._queue_ctrl.exists(queue, project):
raise errors.QueueDoesNotExist(queue, project)
try:
# Pipeline ensures atomic inserts.
with self._client.pipeline() as pipe:
pipe.sadd(member_key, subscriber)
pipe.zadd(subset_key, 1,
subscription_id).hmset(subscription_id, subscription)
pipe.execute()
return subscription_id
except redis.exceptions.ResponseError:
return None
