blob: 9195c27866efcab6cc8bd18be9eef39b1de91a3b [file] [log] [blame]
#!/usr/bin/env python
#
# Copyright 2007 Google 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.
#
"""Tracking of active requests."""
import ctypes
import threading
class RequestState(object):
"""State for a single request."""
def __init__(self, request_id):
self.request_id = request_id
self._threads = set([threading.current_thread().ident])
self._condition = threading.Condition()
def start_thread(self):
"""Records the start of a user-created thread as part of this request."""
thread_id = threading.current_thread().ident
with self._condition:
self._threads.add(thread_id)
def end_thread(self):
"""Records the end of a user-created thread as part of this request."""
thread_id = threading.current_thread().ident
with self._condition:
self._threads.remove(thread_id)
self._condition.notify()
def end_request(self):
"""Ends the request and blocks until all threads for this request finish."""
thread_id = threading.current_thread().ident
with self._condition:
self._threads.remove(thread_id)
while self._threads:
self._condition.wait()
def inject_exception(self, exception):
"""Injects an exception to all threads running as part of this request."""
with self._condition:
thread_ids = list(self._threads)
for thread_id in thread_ids:
ctypes.pythonapi.PyThreadState_SetAsyncExc(
ctypes.c_long(thread_id), ctypes.py_object(exception))
_request_states = {}
_request_states_lock = threading.RLock()
def start_request(request_id):
"""Starts a request with the provided request id."""
with _request_states_lock:
_request_states[request_id] = RequestState(request_id)
def end_request(request_id):
"""Ends the request with the provided request id."""
with _request_states_lock:
request_state = _request_states[request_id]
request_state.end_request()
with _request_states_lock:
del _request_states[request_id]
def get_request_state(request_id):
"""Returns the RequestState for the provided request id."""
with _request_states_lock:
return _request_states[request_id]
def get_request_states():
"""Returns a list of RequestState instances for all current requests."""
with _request_states_lock:
return _request_states.values()