qinling/qinling/utils/thread_local.py
2017-04-17 23:58:36 +12:00

68 lines
2.0 KiB
Python

# Copyright 2017 Catalyst IT Limited
#
# 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.
import threading
from eventlet import corolocal
_th_loc_storage = threading.local()
def _get_greenlet_local_storage():
greenlet_id = corolocal.get_ident()
greenlet_locals = getattr(_th_loc_storage, "greenlet_locals", None)
if not greenlet_locals:
greenlet_locals = {}
_th_loc_storage.greenlet_locals = greenlet_locals
if greenlet_id in greenlet_locals:
return greenlet_locals[greenlet_id]
else:
return None
def has_thread_local(var_name):
gl_storage = _get_greenlet_local_storage()
return gl_storage and var_name in gl_storage
def get_thread_local(var_name):
if not has_thread_local(var_name):
return None
return _get_greenlet_local_storage()[var_name]
def set_thread_local(var_name, val):
if val is None and has_thread_local(var_name):
gl_storage = _get_greenlet_local_storage()
# Delete variable from greenlet local storage.
if gl_storage:
del gl_storage[var_name]
# Delete the entire greenlet local storage from thread local storage.
if gl_storage and len(gl_storage) == 0:
del _th_loc_storage.greenlet_locals[corolocal.get_ident()]
if val is not None:
gl_storage = _get_greenlet_local_storage()
if not gl_storage:
gl_storage = _th_loc_storage.greenlet_locals[
corolocal.get_ident()] = {}
gl_storage[var_name] = val