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=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 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 create(self,
queue,
metadata,
project=None,
limit=storage.DEFAULT_MESSAGES_PER_CLAIM):
if project is None:
project = ''
with self.driver.trans() as trans:
try:
qid = utils.get_qid(self.driver, queue, project)
except errors.QueueDoesNotExist:
return None, iter([])
# Clean up all expired claims in this queue
dlt = tables.Claims.delete().where(
sa.and_(
tables.Claims.c.ttl <= utils.get_age(
tables.Claims.c.created), tables.Claims.c.qid == qid))
trans.execute(dlt)
ins = tables.Claims.insert().values(qid=qid, ttl=metadata['ttl'])
res = trans.execute(ins)
cid = res.lastrowid
and_stmt = sa.and_(
tables.Messages.c.cid == (None), tables.Messages.c.ttl >
sfunc.now() - tables.Messages.c.created,
tables.Messages.c.qid == qid)
sel = sa.sql.select([tables.Messages.c.id], and_stmt).limit(limit)
records = [t[0] for t in trans.execute(sel)]
and_stmt = sa.and_(tables.Messages.c.id.in_(records))
update = tables.Messages.update().values(cid=cid).where(and_stmt)
trans.execute(update)
# NOTE(flaper87): I bet there's a better way
# to do this.
messages_ttl = metadata['ttl'] + metadata['grace']
update = (tables.Messages.update().values(ttl=messages_ttl).where(
sa.and_(tables.Messages.c.ttl < messages_ttl,
tables.Messages.c.cid == cid)))
trans.execute(update)
return (utils.cid_encode(cid), self.__get(cid))
def create(self, queue, metadata, project=None,
limit=storage.DEFAULT_MESSAGES_PER_CLAIM):
if project is None:
project = ''
with self.driver.trans() as trans:
try:
qid = utils.get_qid(self.driver, queue, project)
except errors.QueueDoesNotExist:
return None, iter([])
# Clean up all expired claims in this queue
dlt = tables.Claims.delete().where(sa.and_(
tables.Claims.c.ttl <=
utils.get_age(tables.Claims.c.created),
tables.Claims.c.qid == qid))
trans.execute(dlt)
ins = tables.Claims.insert().values(qid=qid, ttl=metadata['ttl'])
res = trans.execute(ins)
cid = res.lastrowid
and_stmt = sa.and_(tables.Messages.c.cid == (None),
tables.Messages.c.ttl >
sfunc.now() - tables.Messages.c.created,
tables.Messages.c.qid == qid)
sel = sa.sql.select([tables.Messages.c.id], and_stmt).limit(limit)
records = [t[0] for t in trans.execute(sel)]
and_stmt = sa.and_(tables.Messages.c.id.in_(records))
update = tables.Messages.update().values(cid=cid).where(and_stmt)
trans.execute(update)
# NOTE(flaper87): I bet there's a better way
# to do this.
messages_ttl = metadata['ttl'] + metadata['grace']
update = (tables.Messages.update().values(ttl=messages_ttl).
where(sa.and_(
tables.Messages.c.ttl < messages_ttl,
tables.Messages.c.cid == cid)))
trans.execute(update)
return (utils.cid_encode(cid), self.__get(cid))
def __get(self, cid):
# NOTE(flaper87): This probably needs to
# join on `Claim` to check the claim ttl.
sel = sa.sql.select(
[
tables.Messages.c.id, tables.Messages.c.body,
tables.Messages.c.ttl, tables.Messages.c.created
],
sa.and_(
tables.Messages.c.ttl > utils.get_age(
tables.Messages.c.created),
#tables.Messages.c.ttl >
#utils.get_age(tables.Claims.c.created),
tables.Messages.c.cid == cid))
records = self.driver.run(sel)
for id, body, ttl, created in records:
yield {
'id': utils.msgid_encode(id),
'ttl': ttl,
'age': (timeutils.utcnow() - created).seconds,
'body': body,
}
def __get(self, cid):
# NOTE(flaper87): This probably needs to
# join on `Claim` to check the claim ttl.
sel = sa.sql.select([tables.Messages.c.id,
tables.Messages.c.body,
tables.Messages.c.ttl,
tables.Messages.c.created],
sa.and_(
tables.Messages.c.ttl >
utils.get_age(tables.Messages.c.created),
#tables.Messages.c.ttl >
#utils.get_age(tables.Claims.c.created),
tables.Messages.c.cid == cid
))
records = self.driver.run(sel)
for id, body, ttl, created in records:
yield {
'id': utils.msgid_encode(id),
'ttl': ttl,
'age': (timeutils.utcnow() - created).seconds,
'body': body,
}