def _delete(self, path, tega_id=None, version=None):
qname = None
if not tega_id:
tega_id = self.tega_id
if isinstance(path, Cont):
qname = path.qname_()
else:
qname = path2qname(path)
if version and _collision_check(qname, version):
raise ValueError('collision detected')
else:
#
# DELETE OPERATION
#
# _idb _idb
# / copy (D) / / (E)
# o root(A) o o O ..> [Old roots]
# / \ ..> \ ..> \
# o o (B) o o (C) del the attribute
# / \ / \ \
# o o o o X o
# ^
# |
# delete operation
#
root_oid = qname[0]
prev_version, new_version, new_root, above_tail = self._copy_on_write(
qname, above_tail=True)
if above_tail:
oid = qname[-1]
instance = above_tail[oid]
#del above_tail[oid]
del above_tail.__dict__[oid]
if above_tail.is_empty_():
above_tail.delete_()
else:
instance = _idb[path]
if not root_oid in self.candidate:
self.candidate[root_oid] = (prev_version, new_version,
new_root)
# Commit queue
ephemeral = instance.is_ephemeral_()
if ephemeral:
remove_ephemeral_node(tega_id, path)
self._enqueue_commit(OPE.DELETE, path, tega_id, instance,
ephemeral)
def _notify_append(self, log):
'''
Appends a CRUD operation as notifications to subscribers
'''
path = log['path']
instance = log['instance']
qname = path2qname(path)
# Searches "path" in "channels".
# Example:
# regex_path = 'a\.b.\c'
for regex_path in channels:
nested = nested_regex_path(regex_path)
are_parents_or_me = re.match(nested + '$',
path) # (A)a.b or (B)a.b.c
are_children = re.match(regex_path + '\.', path) # (C)a.b.c.d
if are_parents_or_me:
#print(are_parents_or_me.groups())
idx = 1
for elm in are_parents_or_me.groups():
if elm:
idx += 1
else:
break
sub_qname = regex_path.split('\.')[idx:]
#print(are_parents_or_me.groups())
#print(sub_qname)
for regex_oid in sub_qname:
for oid in instance:
# TODO: regex matching multiple children
if re.match(regex_oid, oid):
instance = instance[oid]
path += '.' + oid
else:
break
log['path'] = path
log['instance'] = instance
if are_parents_or_me or are_children:
for subscriber in channels[regex_path]:
try:
if not subscriber in self.notify_batch:
self.notify_batch[subscriber] = []
self.notify_batch[subscriber].append(log)
except:
traceback.print_exc()
logging.warn(
'subscriber removed - {}'.format(subscriber))
channels[_path].remove(subscriber)
def _notify_append(self, log):
'''
Appends a CRUD operation as notifications to subscribers
'''
path = log['path']
instance = log['instance']
qname = path2qname(path)
# Searches "path" in "channels".
# Example:
# regex_path = 'a\.b.\c'
for regex_path in channels:
nested = nested_regex_path(regex_path)
are_parents_or_me = re.match(nested+'$', path) # (A)a.b or (B)a.b.c
are_children = re.match(regex_path+'\.', path) # (C)a.b.c.d
if are_parents_or_me:
#print(are_parents_or_me.groups())
idx = 1
for elm in are_parents_or_me.groups():
if elm:
idx += 1
else:
break
sub_qname = regex_path.split('\.')[idx:]
#print(are_parents_or_me.groups())
#print(sub_qname)
for regex_oid in sub_qname:
for oid in instance:
# TODO: regex matching multiple children
if re.match(regex_oid, oid):
instance = instance[oid]
path += '.' + oid
else:
break
log['path'] = path
log['instance'] = instance
if are_parents_or_me or are_children:
for subscriber in channels[regex_path]:
try:
if not subscriber in self.notify_batch:
self.notify_batch[subscriber] = []
self.notify_batch[subscriber].append(log)
except:
traceback.print_exc()
logging.warn('subscriber removed - {}'.
format(subscriber))
channels[_path].remove(subscriber)
def _delete(self, path, tega_id=None, version=None):
qname = None
if not tega_id:
tega_id = self.tega_id
if isinstance(path, Cont):
qname = path.qname_()
else:
qname = path2qname(path)
if version and _collision_check(qname, version):
raise ValueError('collision detected')
else:
#
# DELETE OPERATION
#
# _idb _idb
# / copy (D) / / (E)
# o root(A) o o O ..> [Old roots]
# / \ ..> \ ..> \
# o o (B) o o (C) del the attribute
# / \ / \ \
# o o o o X o
# ^
# |
# delete operation
#
root_oid = qname[0]
prev_version, new_version, new_root, above_tail = self._copy_on_write(qname, above_tail=True)
if above_tail:
oid = qname[-1]
instance = above_tail[oid]
#del above_tail[oid]
del above_tail.__dict__[oid]
if above_tail.is_empty_():
above_tail.delete_()
else:
instance = _idb[path]
if not root_oid in self.candidate:
self.candidate[root_oid] = (prev_version, new_version, new_root)
# Commit queue
ephemeral = instance.is_ephemeral_()
if ephemeral:
remove_ephemeral_node(tega_id, path)
self._enqueue_commit(OPE.DELETE, path, tega_id, instance, ephemeral)
def rpc(path, args=None, kwargs=None):
'''
RPC (Remote Procedure Call).
Raises KeyError if path is not found in idb.
'''
try:
qname = path2qname(path)
f = get(path)
if type(f) == RPC:
func = get(path)._get_func()
if args and kwargs:
return func(*args, **kwargs)
elif args:
return func(*args)
elif kwargs:
return func(**kwargs)
else:
return func()
else:
raise NonLocalRPC('path exists but not for local RPC')
except KeyError:
raise
def rpc(path, args=None, kwargs=None):
'''
RPC (Remote Procedure Call).
Raises KeyError if path is not found in idb.
'''
try:
qname = path2qname(path)
f = get(path)
if type(f) == RPC:
func = get(path)._get_func()
if args and kwargs:
return func(*args, **kwargs)
elif args:
return func(*args)
elif kwargs:
return func(**kwargs)
else:
return func()
else:
raise NonLocalRPC('path exists but not for local RPC')
except KeyError:
raise
def get(path, version=None, regex_flag=False):
'''
GET operation.
Raises KeyError if path is not found in idb.
'''
try:
if regex_flag:
regex_qname = path.split('\.')
regex_oid = regex_qname[0]
instances = []
for root_oid in _idb:
m = re.match(regex_oid, root_oid)
if m:
regex_groups = []
g = m.groups()
if g:
regex_groups.append(g)
instance = _fetch_root_with_version(root_oid, version)
if len(regex_qname) > 1:
g = _select(instance, regex_qname[1:], regex_groups)
for match in g:
instances.append(match)
else:
instances.append((root_oid, instance, regex_groups))
return instances
else:
qname = path2qname(path)
root_oid = qname[0]
instance = _fetch_root_with_version(root_oid, version)
if len(qname) > 1:
for oid in qname[1:]:
instance = instance.__dict__[oid]
return instance
except KeyError:
raise
def get(path, version=None, regex_flag=False):
'''
GET operation.
Raises KeyError if path is not found in idb.
'''
try:
if regex_flag:
regex_qname = path.split('\.')
regex_oid = regex_qname[0]
instances = []
for root_oid in _idb:
m = re.match(regex_oid, root_oid)
if m:
regex_groups = []
g = m.groups()
if g:
regex_groups.append(g)
instance = _fetch_root_with_version(root_oid, version)
if len(regex_qname) > 1:
g = _select(instance, regex_qname[1:], regex_groups)
for match in g:
instances.append(match)
else:
instances.append((root_oid, instance, regex_groups))
return instances
else:
qname = path2qname(path)
root_oid = qname[0]
instance = _fetch_root_with_version(root_oid, version)
if len(qname) > 1:
for oid in qname[1:]:
instance = instance.__dict__[oid]
return instance
except KeyError:
raise