def get(self, queue, claim_id, project=None):
if project is None:
project = ''
cid = utils.cid_decode(claim_id)
if cid is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
with self.driver.trans() as trans:
sel = sa.sql.select([
tables.Claims.c.id, tables.Claims.c.ttl,
tables.Claims.c.created
],
sa.and_(
tables.Claims.c.ttl > utils.get_age(
tables.Claims.c.created),
tables.Claims.c.id == cid,
tables.Queues.c.project == project,
tables.Queues.c.name == queue),
from_obj=[tables.Queues.join(tables.Claims)])
res = trans.execute(sel).fetchone()
if res is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
cid, ttl, created = res
return ({
'id': claim_id,
'ttl': ttl,
'age': (timeutils.utcnow() - created).seconds
}, self.__get(cid))
def update(self, queue, claim_id, metadata, project=None):
if project is None:
project = ''
cid = utils.cid_decode(claim_id)
if cid is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
age = utils.get_age(tables.Claims.c.created)
with self.driver.trans() as trans:
qid = utils.get_qid(self.driver, queue, project)
update = tables.Claims.update().where(sa.and_(
tables.Claims.c.ttl > age,
tables.Claims.c.id == cid,
tables.Claims.c.id == qid)).\
values(ttl=metadata['ttl'])
res = trans.execute(update)
if res.rowcount != 1:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
update = (tables.Messages.update().values(
ttl=metadata['ttl']).where(
sa.and_(tables.Messages.c.ttl < metadata['ttl'],
tables.Messages.c.cid == cid)))
trans.execute(update)
def get(self, queue, claim_id, project):
if project is None:
project = ''
cid = utils.cid_decode(claim_id)
if cid is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
with self.driver('deferred'):
try:
id, ttl, age = self.driver.get(
'''
select C.id, C.ttl, julianday() * 86400.0 - C.created
from Queues as Q join Claims as C
on Q.id = C.qid
where C.ttl > julianday() * 86400.0 - C.created
and C.id = ? and project = ? and name = ?
''', cid, project, queue)
return ({
'id': claim_id,
'ttl': ttl,
'age': int(age),
}, self.__get(id))
except utils.NoResult:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
def update(self, queue, claim_id, metadata, project):
if project is None:
project = ''
id = utils.cid_decode(claim_id)
if id is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
with self.driver('deferred'):
# still delay the cleanup here
self.driver.run(
'''
update Claims
set created = julianday() * 86400.0,
ttl = ?
where ttl > julianday() * 86400.0 - created
and id = ?
and qid = (select id from Queues
where project = ? and name = ?)
''', metadata['ttl'], id, project, queue)
if not self.driver.affected:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
self.__update_claimed(id, metadata['ttl'])
def update(self, queue, claim_id, metadata, project=None):
cid = utils.to_oid(claim_id)
if cid is None:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
now = timeutils.utcnow_ts()
ttl = int(metadata.get('ttl', 60))
expires = now + ttl
msg_ctrl = self.driver.message_controller
claimed = msg_ctrl._claimed(queue,
cid,
expires=now,
limit=1,
project=project)
try:
next(claimed)
except StopIteration:
raise errors.ClaimDoesNotExist(claim_id, queue, project)
meta = {
'id': cid,
't': ttl,
'e': expires,
}
# TODO(kgriffs): Create methods for these so we don't interact
# with the messages collection directly (loose coupling)
scope = utils.scope_queue_name(queue, project)
collection = msg_ctrl._collection(queue, project)
collection.update({
'p_q': scope,
'c.id': cid
}, {'$set': {
'c': meta
}},
upsert=False,
multi=True)
# NOTE(flaper87): Dirty hack!
# This sets the expiration time to
# `expires` on messages that would
# expire before claim.
collection.update({
'p_q': scope,
'e': {
'$lt': expires
},
'c.id': cid
}, {'$set': {
'e': expires,
't': ttl
}},
upsert=False,
multi=True)
def update(self, queue, claim_id, metadata, project):
target = self._lookup(queue, project)
if target:
control = target.claim_controller
return control.update(queue,
claim_id=claim_id,
project=project,
metadata=metadata)
raise errors.ClaimDoesNotExist(claim_id, queue, project)
def get(self, queue, claim_id, project=None):
msg_ctrl = self.driver.message_controller
# Base query, always check expire time
now = timeutils.utcnow_ts()
cid = utils.to_oid(claim_id)
if cid is None:
raise errors.ClaimDoesNotExist(queue, project, claim_id)
def messages(msg_iter):
msg = next(msg_iter)
yield msg.pop('claim')
yield msg
# Smoke it!
for msg in msg_iter:
del msg['claim']
yield msg
try:
# Lets get claim's data
# from the first message
# in the iterator
msgs = messages(msg_ctrl._claimed(queue, cid, now,
project=project))
claim = next(msgs)
update_time = claim['e'] - claim['t']
age = now - update_time
claim_meta = {
'age': int(age),
'ttl': claim['t'],
'id': str(claim['id']),
}
except StopIteration:
raise errors.ClaimDoesNotExist(cid, queue, project)
return (claim_meta, msgs)
def get(self, queue, claim_id, project):
target = self._lookup(queue, project)
if target:
control = target.claim_controller
return control.get(queue, claim_id=claim_id, project=project)
raise errors.ClaimDoesNotExist(claim_id, queue, project)
