def update(self, obj, edit_session):
'''Updates model object lock as being active. Raises exception on
error. obj should be either model object or its global identifier.'''
cfg = self.env.cfg
redis = self.env.redis
key = self._item_lock_key(obj)
with redis.pipeline() as pipe:
for i in range(2):
try:
# put a WATCH on the key that holds our sequence value
pipe.watch(key)
old_value = loads(pipe.get(key))
if old_value is None:
raise ModelLockIsLost()
elif old_value['edit_session']==edit_session:
# now we can put the pipeline back into buffered mode with MULTI
pipe.multi()
pipe.expire(key, cfg.MODEL_LOCK_TIMEOUT)
pipe.execute()
return edit_session
else:
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user, old_value['edit_session'])
except WatchError:
continue
logger.error('Failed to update model object lock. '\
'Problem with redis?')
raise ModelLockError()
def update(self, obj, edit_session):
'''Updates model object lock as being active. Raises exception on
error. obj should be either model object or its global identifier.'''
cfg = self.env.cfg
redis = self.env.redis
key = self._item_lock_key(obj)
with redis.pipeline() as pipe:
for i in range(2):
try:
# put a WATCH on the key that holds our sequence value
pipe.watch(key)
old_value = loads(pipe.get(key))
if old_value is None:
raise ModelLockIsLost()
elif old_value['edit_session'] == edit_session:
# now we can put the pipeline back into buffered mode with MULTI
pipe.multi()
pipe.expire(key, cfg.MODEL_LOCK_TIMEOUT)
pipe.execute()
return edit_session
else:
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user,
old_value['edit_session'])
except WatchError:
continue
logger.error('Failed to update model object lock. '\
'Problem with redis?')
raise ModelLockError()
def create(self, obj, force=False):
'''Marks model object as editted. Returns edit session on success or
raises exception. obj should be either model object or its global
identifier. When force is True the current lock is ignored.'''
cfg = self.env.cfg
redis = self.env.redis
edit_session = self._create_edit_session()
key = self._item_lock_key(obj)
value = self._item_lock_value(edit_session)
if force:
redis.set(key, json.dumps(value))
redis.expire(key, cfg.MODEL_LOCK_TIMEOUT)
return edit_session
with redis.pipeline() as pipe:
for i in range(2):
try:
# put a WATCH on the key that holds our sequence value
pipe.watch(key)
# after WATCHing, the pipeline is put into immediate execution
# mode until we tell it to start buffering commands again.
# this allows us to get the current value of our sequence
old_value = loads(pipe.get(key))
if old_value is None:
# now we can put the pipeline back into buffered mode with MULTI
pipe.multi()
pipe.set(key, json.dumps(value))
pipe.expire(key, cfg.MODEL_LOCK_TIMEOUT)
# and finally, execute the pipeline (the set command)
pipe.execute()
# if a WatchError wasn't raised during execution, everything
# we just did happened atomically.
return edit_session
else:
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user,
old_value['edit_session'])
except WatchError:
continue
logger.error('Failed to lock model object. '\
'Problem with redis?')
raise ModelLockError()
def create(self, obj, force=False):
'''Marks model object as editted. Returns edit session on success or
raises exception. obj should be either model object or its global
identifier. When force is True the current lock is ignored.'''
cfg = self.env.cfg
redis = self.env.redis
edit_session = self._create_edit_session()
key = self._item_lock_key(obj)
value = self._item_lock_value(edit_session)
if force:
redis.set(key, json.dumps(value))
redis.expire(key, cfg.MODEL_LOCK_TIMEOUT)
return edit_session
with redis.pipeline() as pipe:
for i in range(2):
try:
# put a WATCH on the key that holds our sequence value
pipe.watch(key)
# after WATCHing, the pipeline is put into immediate execution
# mode until we tell it to start buffering commands again.
# this allows us to get the current value of our sequence
old_value = loads(pipe.get(key))
if old_value is None:
# now we can put the pipeline back into buffered mode with MULTI
pipe.multi()
pipe.set(key, json.dumps(value))
pipe.expire(key, cfg.MODEL_LOCK_TIMEOUT)
# and finally, execute the pipeline (the set command)
pipe.execute()
# if a WatchError wasn't raised during execution, everything
# we just did happened atomically.
return edit_session
else:
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user, old_value['edit_session'])
except WatchError:
continue
logger.error('Failed to lock model object. '\
'Problem with redis?')
raise ModelLockError()
def create(self, obj, force=False):
'''Marks model object as editted. Returns edit session on success or
raises exception. obj should be either model object or its global
identifier. When force is True the current lock is ignored.'''
cfg = self.env.cfg
cache = self.env.cache
cache.cas_ids.clear()
edit_session = self._create_edit_session()
key = self._item_lock_key(obj)
value = self._item_lock_value(edit_session)
if force:
if cache.set(key, value, time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
else:
raise ModelLockError()
for i in range(3):
if cache.add(key, value, time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
old_value = cache.gets(key)
if old_value is None:
# Should try add() again
continue
if not old_value or \
time()-old_value['time']>cfg.MODEL_LOCK_TIMEOUT:
# Somebody's lock is already expired
if cache.cas(key, value,
time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
else:
continue
# Somebody holds active lock, no farther attempts
break
else:
logger.error('Failed to lock model object. '\
'Problem with memcached?')
raise ModelLockError()
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user, old_value['edit_session'])
def create(self, obj, force=False):
'''Marks model object as editted. Returns edit session on success or
raises exception. obj should be either model object or its global
identifier. When force is True the current lock is ignored.'''
cfg = self.env.cfg
cache = self.env.cache
cache.cas_ids.clear()
edit_session = self._create_edit_session()
key = self._item_lock_key(obj)
value = self._item_lock_value(edit_session)
if force:
if cache.set(key, value, time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
else:
raise ModelLockError()
for i in range(3):
if cache.add(key, value, time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
old_value = cache.gets(key)
if old_value is None:
# Should try add() again
continue
if not old_value or \
time()-old_value['time']>cfg.MODEL_LOCK_TIMEOUT:
# Somebody's lock is already expired
if cache.cas(key, value, time=cfg.MODEL_LOCK_TIMEOUT):
return edit_session
else:
continue
# Somebody holds active lock, no farther attempts
break
else:
logger.error('Failed to lock model object. '\
'Problem with memcached?')
raise ModelLockError()
lock_user = self.env.db.query(self.env.auth_model)\
.get(old_value['user_id'])
raise ModelLockedByOther(lock_user, old_value['edit_session'])
