def get(self, queue, claim_id, project=None):
if not self._exists(queue, claim_id, project):
raise errors.ClaimDoesNotExist(queue, project, claim_id)
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
# basic_messages
msg_keys = self._get_claimed_message_keys(claim_msgs_key)
claimed_msgs = messages.Message.from_redis_bulk(msg_keys,
self._client)
now = timeutils.utcnow_ts()
basic_messages = [msg.to_basic(now)
for msg in claimed_msgs if msg]
# claim_meta
now = timeutils.utcnow_ts()
expires, ttl = self._get_claim_info(claim_id, [b'e', b't'])
update_time = expires - ttl
age = now - update_time
claim_meta = {
'age': age,
'ttl': ttl,
'id': claim_id,
}
return claim_meta, basic_messages
def delete(self, queue, claim_id, project=None):
# NOTE(prashanthr_): Return silently when the claim
# does not exist
if not self._exists(queue, claim_id, project):
return
now = timeutils.utcnow_ts()
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
msg_keys = self._get_claimed_message_keys(claim_msgs_key)
claimed_msgs = messages.MessageEnvelope.from_redis_bulk(msg_keys,
self._client)
# Update the claim id and claim expiration info
# for all the messages.
claims_set_key = utils.scope_claims_set(queue, project,
QUEUE_CLAIMS_SUFFIX)
with self._client.pipeline() as pipe:
pipe.zrem(claims_set_key, claim_id)
pipe.delete(claim_id)
pipe.delete(claim_msgs_key)
for msg in claimed_msgs:
if msg:
msg.claim_id = None
msg.claim_expires = now
# TODO(kgriffs): Rather than writing back the
# entire message, only set the fields that
# have changed.
msg.to_redis(pipe)
pipe.execute()
def get(self, queue, claim_id, project=None):
if not self._exists(queue, claim_id, project):
raise errors.ClaimDoesNotExist(claim_id, queue, project)
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
# basic_messages
msg_keys = self._get_claimed_message_keys(claim_msgs_key)
claimed_msgs = messages.Message.from_redis_bulk(msg_keys, self._client)
now = timeutils.utcnow_ts()
basic_messages = [msg.to_basic(now) for msg in claimed_msgs if msg]
# claim_meta
now = timeutils.utcnow_ts()
expires, ttl = self._get_claim_info(claim_id, [b'e', b't'])
update_time = expires - ttl
age = now - update_time
claim_meta = {
'age': age,
'ttl': ttl,
'id': claim_id,
}
return claim_meta, basic_messages
def delete(self, queue, claim_id, project=None):
# NOTE(prashanthr_): Return silently when the claim
# does not exist
if not self._exists(queue, claim_id, project):
return
now = timeutils.utcnow_ts()
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
msg_keys = self._get_claimed_message_keys(claim_msgs_key)
claimed_msgs = messages.MessageEnvelope.from_redis_bulk(
msg_keys, self._client)
# Update the claim id and claim expiration info
# for all the messages.
claims_set_key = utils.scope_claims_set(queue, project,
QUEUE_CLAIMS_SUFFIX)
with self._client.pipeline() as pipe:
pipe.zrem(claims_set_key, claim_id)
pipe.delete(claim_id)
pipe.delete(claim_msgs_key)
for msg in claimed_msgs:
if msg:
msg.claim_id = None
msg.claim_expires = now
# TODO(kgriffs): Rather than writing back the
# entire message, only set the fields that
# have changed.
msg.to_redis(pipe)
pipe.execute()
def create(self, queue, metadata, project=None,
limit=storage.DEFAULT_MESSAGES_PER_CLAIM):
claim_ttl = metadata['ttl']
grace = metadata['grace']
now = timeutils.utcnow_ts()
msg_ttl = claim_ttl + grace
claim_expires = now + claim_ttl
msg_expires = claim_expires + grace
claim_id = uuidutils.generate_uuid()
claimed_msgs = []
# NOTE(kgriffs): Claim some messages
msgset_key = utils.msgset_key(queue, project)
claimed_ids = self._claim_messages(msgset_key, now, limit,
claim_id, claim_expires,
msg_ttl, msg_expires)
if claimed_ids:
claimed_msgs = messages.Message.from_redis_bulk(claimed_ids,
self._client)
claimed_msgs = [msg.to_basic(now) for msg in claimed_msgs]
# NOTE(kgriffs): Perist claim records
with self._client.pipeline() as pipe:
claim_msgs_key = utils.scope_claim_messages(
claim_id, CLAIM_MESSAGES_SUFFIX)
for mid in claimed_ids:
pipe.rpush(claim_msgs_key, mid)
pipe.expire(claim_msgs_key, claim_ttl)
claim_info = {
'id': claim_id,
't': claim_ttl,
'e': claim_expires,
'n': len(claimed_ids),
}
pipe.hmset(claim_id, claim_info)
pipe.expire(claim_id, claim_ttl)
# NOTE(kgriffs): Add the claim ID to a set so that
# existence checks can be performed quickly. This
# is also used as a watch key in order to gaurd
# against race conditions.
#
# A sorted set is used to facilitate cleaning
# up the IDs of expired claims.
claims_set_key = utils.scope_claims_set(queue, project,
QUEUE_CLAIMS_SUFFIX)
pipe.zadd(claims_set_key, claim_expires, claim_id)
pipe.execute()
return claim_id, claimed_msgs
def update(self, queue, claim_id, metadata, project=None):
if not self._exists(queue, claim_id, project):
raise errors.ClaimDoesNotExist(claim_id, queue, project)
now = timeutils.utcnow_ts()
claim_ttl = metadata['ttl']
claim_expires = now + claim_ttl
grace = metadata['grace']
msg_ttl = claim_ttl + grace
msg_expires = claim_expires + grace
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
msg_keys = self._get_claimed_message_keys(claim_msgs_key)
claimed_msgs = messages.MessageEnvelope.from_redis_bulk(msg_keys,
self._client)
claim_info = {
't': claim_ttl,
'e': claim_expires,
}
with self._client.pipeline() as pipe:
for msg in claimed_msgs:
if msg:
msg.claim_id = claim_id
msg.claim_expires = claim_expires
if _msg_would_expire(msg, claim_expires):
msg.ttl = msg_ttl
msg.expires = msg_expires
# TODO(kgriffs): Rather than writing back the
# entire message, only set the fields that
# have changed.
#
# When this change is made, don't forget to
# also call pipe.expire with the new TTL value.
msg.to_redis(pipe)
# Update the claim id and claim expiration info
# for all the messages.
pipe.hmset(claim_id, claim_info)
pipe.expire(claim_id, claim_ttl)
pipe.expire(claim_msgs_key, claim_ttl)
claims_set_key = utils.scope_claims_set(queue, project,
QUEUE_CLAIMS_SUFFIX)
pipe.zadd(claims_set_key, claim_expires, claim_id)
pipe.execute()
def _del_message(self, queue, project, claim_id, message_id, pipe):
"""Called by MessageController when messages are being deleted.
This method removes the message from claim data structures.
"""
claim_msgs_key = utils.scope_claim_messages(claim_id,
CLAIM_MESSAGES_SUFFIX)
# NOTE(kgriffs): In practice, scanning will be quite fast,
# since the usual pattern is to delete messages from oldest
# to newest, and the list is sorted in that order. Also,
# the length of the list will usually be ~10 messages.
pipe.lrem(claim_msgs_key, 1, message_id)
# NOTE(kgriffs): Decrement the message counter used for stats
pipe.hincrby(claim_id, 'n', -1)
def create(self, queue, metadata, project=None,
limit=storage.DEFAULT_MESSAGES_PER_CLAIM):
queue_ctrl = self.driver.queue_controller
msg_ctrl = self.driver.message_controller
claim_ttl = metadata['ttl']
grace = metadata['grace']
now = timeutils.utcnow_ts()
msg_ttl = claim_ttl + grace
claim_expires = now + claim_ttl
msg_expires = claim_expires + grace
# Get the maxClaimCount and deadLetterQueue from current queue's meta
queue_meta = queue_ctrl.get(queue, project=project)
claim_id = uuidutils.generate_uuid()
claimed_msgs = []
# NOTE(kgriffs): Claim some messages
msgset_key = utils.msgset_key(queue, project)
claimed_ids = self._claim_messages(msgset_key, now, limit,
claim_id, claim_expires,
msg_ttl, msg_expires)
if claimed_ids:
claimed_msgs = messages.Message.from_redis_bulk(claimed_ids,
self._client)
claimed_msgs = [msg.to_basic(now) for msg in claimed_msgs]
# NOTE(kgriffs): Perist claim records
with self._client.pipeline() as pipe:
claim_msgs_key = utils.scope_claim_messages(
claim_id, CLAIM_MESSAGES_SUFFIX)
for mid in claimed_ids:
pipe.rpush(claim_msgs_key, mid)
pipe.expire(claim_msgs_key, claim_ttl)
claim_info = {
'id': claim_id,
't': claim_ttl,
'e': claim_expires,
'n': len(claimed_ids),
}
pipe.hmset(claim_id, claim_info)
pipe.expire(claim_id, claim_ttl)
# NOTE(kgriffs): Add the claim ID to a set so that
# existence checks can be performed quickly. This
# is also used as a watch key in order to guard
# against race conditions.
#
# A sorted set is used to facilitate cleaning
# up the IDs of expired claims.
claims_set_key = utils.scope_claims_set(queue, project,
QUEUE_CLAIMS_SUFFIX)
pipe.zadd(claims_set_key, {claim_id: claim_expires})
pipe.execute()
if ('_max_claim_count' in queue_meta and
'_dead_letter_queue' in queue_meta):
claimed_msgs_removed = []
for msg in claimed_msgs:
if msg:
claimed_count = msg['claim_count']
if claimed_count < queue_meta['_max_claim_count']:
# 1. Save the new max claim count for message
claim_count = claimed_count + 1
dic = {"c.c": claim_count}
pipe.hmset(msg['id'], dic)
pipe.execute()
else:
# 2. Check if the message's claim count has
# exceeded the max claim count defined in the
# queue, if so, move the message to the dead
# letter queue and modify it's ttl.
# NOTE(gengchc): We're moving message by
# moving the message id from queue to dead
# letter queue directly.That means, the queue
# and dead letter queue must be created on
# the same pool.
ddl = utils.scope_queue_name(
queue_meta['_dead_letter_queue'], project)
ddl_ttl = queue_meta.get(
"_dead_letter_queue_messages_ttl")
dic = {"t": msg['ttl']}
if ddl_ttl:
dic = {"t": ddl_ttl}
pipe.hmset(msg['id'], dic)
queueproject = [s for s in ddl.split('.')]
msgs_key_ddl = utils.msgset_key(
queueproject[1], queueproject[0])
counter_key_ddl = utils.scope_queue_index(
queueproject[1], queueproject[0],
MESSAGE_RANK_COUNTER_SUFFIX)
msgs_key = utils.msgset_key(
queue, project=project)
pipe.zrem(msgs_key, msg['id'])
message_ids = []
message_ids.append(msg['id'])
msg_ctrl._index_messages(msgs_key_ddl,
counter_key_ddl,
message_ids)
pipe.execute()
# Add dead letter message to
# claimed_msgs_removed, finally remove
# them from claimed_msgs.
claimed_msgs_removed.append(msg)
# Remove dead letter messages from claimed_msgs.
for msg_remove in claimed_msgs_removed:
claimed_msgs.remove(msg_remove)
if len(claimed_msgs) == 0:
return None, iter([])
return claim_id, claimed_msgs
def create(self,
queue,
metadata,
project=None,
limit=storage.DEFAULT_MESSAGES_PER_CLAIM):
queue_ctrl = self.driver.queue_controller
msg_ctrl = self.driver.message_controller
claim_ttl = metadata['ttl']
grace = metadata['grace']
now = timeutils.utcnow_ts()
msg_ttl = claim_ttl + grace
claim_expires = now + claim_ttl
msg_expires = claim_expires + grace
# Get the maxClaimCount and deadLetterQueue from current queue's meta
queue_meta = queue_ctrl.get(queue, project=project)
claim_id = uuidutils.generate_uuid()
claimed_msgs = []
# NOTE(kgriffs): Claim some messages
msgset_key = utils.msgset_key(queue, project)
claimed_ids = self._claim_messages(msgset_key, now, limit, claim_id,
claim_expires, msg_ttl, msg_expires)
if claimed_ids:
claimed_msgs = messages.Message.from_redis_bulk(
claimed_ids, self._client)
claimed_msgs = [msg.to_basic(now) for msg in claimed_msgs]
# NOTE(kgriffs): Perist claim records
with self._client.pipeline() as pipe:
claim_msgs_key = utils.scope_claim_messages(
claim_id, CLAIM_MESSAGES_SUFFIX)
for mid in claimed_ids:
pipe.rpush(claim_msgs_key, mid)
pipe.expire(claim_msgs_key, claim_ttl)
claim_info = {
'id': claim_id,
't': claim_ttl,
'e': claim_expires,
'n': len(claimed_ids),
}
pipe.hmset(claim_id, claim_info)
pipe.expire(claim_id, claim_ttl)
# NOTE(kgriffs): Add the claim ID to a set so that
# existence checks can be performed quickly. This
# is also used as a watch key in order to guard
# against race conditions.
#
# A sorted set is used to facilitate cleaning
# up the IDs of expired claims.
claims_set_key = utils.scope_claims_set(
queue, project, QUEUE_CLAIMS_SUFFIX)
pipe.zadd(claims_set_key, claim_expires, claim_id)
pipe.execute()
if ('_max_claim_count' in queue_meta
and '_dead_letter_queue' in queue_meta):
claimed_msgs_removed = []
for msg in claimed_msgs:
if msg:
claimed_count = msg['claim_count']
if claimed_count < queue_meta['_max_claim_count']:
# 1. Save the new max claim count for message
claim_count = claimed_count + 1
dic = {"c.c": claim_count}
pipe.hmset(msg['id'], dic)
pipe.execute()
else:
# 2. Check if the message's claim count has
# exceeded the max claim count defined in the
# queue, if so, move the message to the dead
# letter queue and modify it's ttl.
# NOTE(gengchc): We're moving message by
# moving the message id from queue to dead
# letter queue directly.That means, the queue
# and dead letter queue must be created on
# the same pool.
ddl = utils.scope_queue_name(
queue_meta['_dead_letter_queue'], project)
ddl_ttl = queue_meta.get(
"_dead_letter_queue_messages_ttl")
dic = {"t": msg['ttl']}
if ddl_ttl:
dic = {"t": ddl_ttl}
pipe.hmset(msg['id'], dic)
queueproject = [s for s in ddl.split('.')]
msgs_key_ddl = utils.msgset_key(
queueproject[1], queueproject[0])
counter_key_ddl = utils.scope_queue_index(
queueproject[1], queueproject[0],
MESSAGE_RANK_COUNTER_SUFFIX)
msgs_key = utils.msgset_key(queue,
project=project)
pipe.zrem(msgs_key, msg['id'])
message_ids = []
message_ids.append(msg['id'])
msg_ctrl._index_messages(
msgs_key_ddl, counter_key_ddl, message_ids)
pipe.execute()
# Add dead letter message to
# claimed_msgs_removed, finally remove
# them from claimed_msgs.
claimed_msgs_removed.append(msg)
# Remove dead letter messages from claimed_msgs.
for msg_remove in claimed_msgs_removed:
claimed_msgs.remove(msg_remove)
if len(claimed_msgs) == 0:
return None, iter([])
return claim_id, claimed_msgs
