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# Copyright (c) 2014 Rackspace, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from zaqarclient.queues.v2 import core
from zaqarclient.queues.v2 import iterator
from zaqarclient.queues.v2 import message
class Claim(object):
def __init__(self, queue, id=None,
ttl=None, grace=None, limit=None):
self._queue = queue
self.id = id
self._ttl = ttl
self._grace = grace
self._age = None
self._limit = limit
self._message_iter = None
if id is None:
self._create()
def __repr__(self):
return '<Claim id:{id} ttl:{ttl} age:{age}>'.format(id=self.id,
ttl=self.ttl,
age=self.age)
def _get(self):
req, trans = self._queue.client._request_and_transport()
claim_res = core.claim_get(trans, req, self._queue._name,
self.id)
self._age = claim_res['age']
self._ttl = claim_res['ttl']
self._grace = claim_res.get('grace')
msgs = claim_res.get('messages', [])
self._message_iter = iterator._Iterator(self._queue.client,
msgs,
'messages',
message.create_object(
self._queue
))
def _create(self):
req, trans = self._queue.client._request_and_transport()
msgs = core.claim_create(trans, req,
self._queue._name,
ttl=self._ttl,
grace=self._grace,
limit=self._limit)
# extract the id from the first message
if msgs is not None:
msgs = msgs['messages']
self.id = msgs[0]['href'].split('=')[-1]
self._message_iter = iterator._Iterator(self._queue.client,
msgs or [],
'messages',
message.create_object(
self._queue
))
def __iter__(self):
if self._message_iter is None:
self._get()
return self._message_iter
@property
def age(self):
self._get()
return self._age
@property
def ttl(self):
if self._ttl is None:
self._get()
return self._ttl
def delete(self):
req, trans = self._queue.client._request_and_transport()
core.claim_delete(trans, req, self._queue._name, self.id)
def update(self, ttl=None, grace=None):
req, trans = self._queue.client._request_and_transport()
kwargs = {}
if ttl is not None:
kwargs['ttl'] = ttl
if grace is not None:
kwargs['grace'] = grace
res = core.claim_update(trans, req, self._queue._name, self.id,
**kwargs)
# if the update succeeds, update our attributes.
if ttl is not None:
self._ttl = ttl
if grace is not None:
self._grace = grace
return res
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