"""
raven.transport.threaded
~~~~~~~~~~~~~~~~~~~~~~~~
:copyright: (c) 2010-2012 by the Sentry Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
import atexit
import logging
import threading
import os
from time import sleep, time
from raven.transport.base import AsyncTransport
from raven.transport.http import HTTPTransport
from raven.utils.compat import Queue, check_threads
DEFAULT_TIMEOUT = 10
logger = logging.getLogger('sentry.errors')
class AsyncWorker(object):
_terminator = object()
def __init__(self, shutdown_timeout=DEFAULT_TIMEOUT):
check_threads()
self._queue = Queue(-1)
self._lock = threading.Lock()
self._thread = None
self._thread_for_pid = None
self.options = {
'shutdown_timeout': shutdown_timeout,
}
self.start()
def is_alive(self):
if self._thread_for_pid != os.getpid():
return False
return self._thread and self._thread.is_alive()
def _ensure_thread(self):
if self.is_alive():
return
self.start()
def main_thread_terminated(self):
with self._lock:
if not self.is_alive():
# thread not started or already stopped - nothing to do
return
# wake the processing thread up
self._queue.put_nowait(self._terminator)
timeout = self.options['shutdown_timeout']
# wait briefly, initially
initial_timeout = min(0.1, timeout)
if not self._timed_queue_join(initial_timeout):
# if that didn't work, wait a bit longer
# NB that size is an approximation, because other threads may
# add or remove items
size = self._queue.qsize()
print("Sentry is attempting to send %i pending error messages"
% size)
print("Waiting up to %s seconds" % timeout)
if os.name == 'nt':
print("Press Ctrl-Break to quit")
else:
print("Press Ctrl-C to quit")
self._timed_queue_join(timeout - initial_timeout)
self._thread = None
def _timed_queue_join(self, timeout):
"""
implementation of Queue.join which takes a 'timeout' argument
returns true on success, false on timeout
"""
deadline = time() + timeout
queue = self._queue
queue.all_tasks_done.acquire()
try:
while queue.unfinished_tasks:
delay = deadline - time()
if delay <= 0:
# timed out
return False
queue.all_tasks_done.wait(timeout=delay)
return True
finally:
queue.all_tasks_done.release()
def start(self):
"""
Starts the task thread.
"""
self._lock.acquire()
try:
if not self.is_alive():
self._thread = threading.Thread(target=self._target, name="raven.AsyncWorker")
self._thread.setDaemon(True)
self._thread.start()
self._thread_for_pid = os.getpid()
finally:
self._lock.release()
atexit.register(self.main_thread_terminated)
def stop(self, timeout=None):
"""
Stops the task thread. Synchronous!
"""
with self._lock:
if self._thread:
self._queue.put_nowait(self._terminator)
self._thread.join(timeout=timeout)
self._thread = None
self._thread_for_pid = None
def queue(self, callback, *args, **kwargs):
self._ensure_thread()
self._queue.put_nowait((callback, args, kwargs))
def _target(self):
while True:
record = self._queue.get()
try:
if record is self._terminator:
break
callback, args, kwargs = record
try:
callback(*args, **kwargs)
except Exception:
logger.error('Failed processing job', exc_info=True)
finally:
self._queue.task_done()
sleep(0)
class ThreadedHTTPTransport(AsyncTransport, HTTPTransport):
scheme = ['http', 'https', 'threaded+http', 'threaded+https']
def get_worker(self):
if not hasattr(self, '_worker') or not self._worker.is_alive():
self._worker = AsyncWorker()
return self._worker
def send_sync(self, url, data, headers, success_cb, failure_cb):
try:
super(ThreadedHTTPTransport, self).send(url, data, headers)
except Exception as e:
failure_cb(e)
else:
success_cb()
def async_send(self, url, data, headers, success_cb, failure_cb):
self.get_worker().queue(
self.send_sync, url, data, headers, success_cb, failure_cb)
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