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224 lines
7.2 KiB
224 lines
7.2 KiB
# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation. |
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# Copyright (C) 2013 YAMAMOTO Takashi <yamamoto at valinux co jp> |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import logging |
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import os |
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from os_ken.lib import ip |
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# We don't bother to use cfg.py because monkey patch needs to be |
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# called very early. Instead, we use an environment variable to |
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# select the type of hub. |
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HUB_TYPE = os.getenv('OSKEN_HUB_TYPE', 'eventlet') |
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LOG = logging.getLogger('os_ken.lib.hub') |
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if HUB_TYPE == 'eventlet': |
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import eventlet |
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# HACK: |
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# sleep() is the workaround for the following issue. |
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# https://github.com/eventlet/eventlet/issues/401 |
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eventlet.sleep() |
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import eventlet.event |
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import eventlet.queue |
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import eventlet.semaphore |
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import eventlet.timeout |
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import eventlet.wsgi |
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from eventlet import websocket |
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import greenlet |
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import ssl |
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import socket |
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import traceback |
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getcurrent = eventlet.getcurrent |
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patch = eventlet.monkey_patch |
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sleep = eventlet.sleep |
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listen = eventlet.listen |
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connect = eventlet.connect |
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def spawn(*args, **kwargs): |
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raise_error = kwargs.pop('raise_error', False) |
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def _launch(func, *args, **kwargs): |
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# Mimic gevent's default raise_error=False behaviour |
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# by not propagating an exception to the joiner. |
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try: |
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return func(*args, **kwargs) |
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except TaskExit: |
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pass |
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except BaseException as e: |
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if raise_error: |
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raise e |
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# Log uncaught exception. |
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# Note: this is an intentional divergence from gevent |
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# behaviour; gevent silently ignores such exceptions. |
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LOG.error('hub: uncaught exception: %s', |
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traceback.format_exc()) |
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return eventlet.spawn(_launch, *args, **kwargs) |
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def spawn_after(seconds, *args, **kwargs): |
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raise_error = kwargs.pop('raise_error', False) |
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def _launch(func, *args, **kwargs): |
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# Mimic gevent's default raise_error=False behaviour |
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# by not propagating an exception to the joiner. |
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try: |
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return func(*args, **kwargs) |
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except TaskExit: |
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pass |
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except BaseException as e: |
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if raise_error: |
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raise e |
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# Log uncaught exception. |
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# Note: this is an intentional divergence from gevent |
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# behaviour; gevent silently ignores such exceptions. |
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LOG.error('hub: uncaught exception: %s', |
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traceback.format_exc()) |
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return eventlet.spawn_after(seconds, _launch, *args, **kwargs) |
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def kill(thread): |
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thread.kill() |
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def joinall(threads): |
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for t in threads: |
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# This try-except is necessary when killing an inactive |
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# greenthread. |
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try: |
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t.wait() |
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except TaskExit: |
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pass |
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Queue = eventlet.queue.LightQueue |
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QueueEmpty = eventlet.queue.Empty |
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Semaphore = eventlet.semaphore.Semaphore |
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BoundedSemaphore = eventlet.semaphore.BoundedSemaphore |
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TaskExit = greenlet.GreenletExit |
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class StreamServer(object): |
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def __init__(self, listen_info, handle=None, backlog=None, |
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spawn='default', **ssl_args): |
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assert backlog is None |
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assert spawn == 'default' |
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if ip.valid_ipv6(listen_info[0]): |
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self.server = eventlet.listen(listen_info, |
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family=socket.AF_INET6) |
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elif os.path.isdir(os.path.dirname(listen_info[0])): |
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# Case for Unix domain socket |
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self.server = eventlet.listen(listen_info[0], |
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family=socket.AF_UNIX) |
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else: |
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self.server = eventlet.listen(listen_info) |
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if ssl_args: |
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def wrap_and_handle(sock, addr): |
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ssl_args.setdefault('server_side', True) |
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handle(ssl.wrap_socket(sock, **ssl_args), addr) |
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self.handle = wrap_and_handle |
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else: |
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self.handle = handle |
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def serve_forever(self): |
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while True: |
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sock, addr = self.server.accept() |
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spawn(self.handle, sock, addr) |
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class StreamClient(object): |
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def __init__(self, addr, timeout=None, **ssl_args): |
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assert ip.valid_ipv4(addr[0]) or ip.valid_ipv6(addr[0]) |
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self.addr = addr |
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self.timeout = timeout |
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self.ssl_args = ssl_args |
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self._is_active = True |
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def connect(self): |
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try: |
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if self.timeout is not None: |
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client = socket.create_connection(self.addr, |
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timeout=self.timeout) |
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else: |
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client = socket.create_connection(self.addr) |
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except socket.error: |
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return None |
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if self.ssl_args: |
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client = ssl.wrap_socket(client, **self.ssl_args) |
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return client |
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def connect_loop(self, handle, interval): |
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while self._is_active: |
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sock = self.connect() |
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if sock: |
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handle(sock, self.addr) |
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sleep(interval) |
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def stop(self): |
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self._is_active = False |
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class LoggingWrapper(object): |
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def write(self, message): |
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LOG.info(message.rstrip('\n')) |
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class WSGIServer(StreamServer): |
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def serve_forever(self): |
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self.logger = LoggingWrapper() |
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eventlet.wsgi.server(self.server, self.handle, self.logger) |
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WebSocketWSGI = websocket.WebSocketWSGI |
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Timeout = eventlet.timeout.Timeout |
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class Event(object): |
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def __init__(self): |
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self._ev = eventlet.event.Event() |
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self._cond = False |
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def _wait(self, timeout=None): |
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while not self._cond: |
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self._ev.wait() |
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def _broadcast(self): |
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self._ev.send() |
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# Since eventlet Event doesn't allow multiple send() operations |
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# on an event, re-create the underlying event. |
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# Note: _ev.reset() is obsolete. |
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self._ev = eventlet.event.Event() |
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def is_set(self): |
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return self._cond |
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def set(self): |
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self._cond = True |
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self._broadcast() |
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def clear(self): |
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self._cond = False |
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def wait(self, timeout=None): |
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if timeout is None: |
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self._wait() |
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else: |
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try: |
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with Timeout(timeout): |
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self._wait() |
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except Timeout: |
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pass |
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return self._cond
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