How to use _server_thread method in autotest

Best Python code snippet using autotest_python Github


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1# Copyright 2018 Google LLC2#3# Licensed under the Apache License, Version 2.0 (the "License");4# you may not use this file except in compliance with the License.5# You may obtain a copy of the License at6#7# Unless required by applicable law or agreed to in writing, software10# distributed under the License is distributed on an "AS IS" BASIS,11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.12# See the License for the specific language governing permissions and13# limitations under the License.14"""Tornado server running in a background thread."""15from __future__ import absolute_import16from __future__ import division17from __future__ import print_function18import threading19import portpicker20import tornado21import tornado.httpserver22import tornado.ioloop23import tornado.web24class _BackgroundServer(object):25 """HTTP server that runs in a background thread."""26 def __init__(self, app):27 """Initialize (but do not start) background server.28 Args:29 app: server application to run.30 """31 self._app = app32 # These will be initialized when starting the server.33 self._port = None34 self._server_thread = None35 self._ioloop = None36 self._server = None37 @property38 def port(self):39 """Returns the current port or error if the server is not started.40 Raises:41 RuntimeError: If server has not been started yet.42 Returns:43 The port being used by the server.44 """45 if self._server_thread is None:46 raise RuntimeError('Server not running.')47 return self._port48 def stop(self):49 """Stops the server thread.50 Raises:51 RuntimeError: if server is already stopped.52 """53 if self._server_thread is None:54 raise RuntimeError('stop() called on stopped server')55 def shutdown():56 self._server.stop()57 self._ioloop.stop()58 try:59 self._ioloop.add_callback(shutdown)60 self._server_thread.join()61 self._ioloop.close(all_fds=True)62 finally:63 self._server_thread = None64 def start(self, port=None, timeout=1):65 """Starts a server in a thread using the WSGI application provided.66 Will wait until the thread has started calling with an already serving67 application will simple return.68 Args:69 port: Number of the port to use for the application, will find an open70 port if a nonzero port is not provided.71 timeout: Http timeout in seconds. Note that this is only respected under72 tornado v4.73 Raises:74 RuntimeError: if server is already started.75 """76 if self._server_thread is not None:77 raise RuntimeError('start() called on running background server.')78 self._port = port or portpicker.pick_unused_port()79 # Support both internal & external colab (tornado v3 vs. v4)80 # TODO(b/35548011): remove tornado v3 handling81 if tornado.version[0] >= '4':82 kwds = {'idle_connection_timeout': timeout, 'body_timeout': timeout}83 else:84 kwds = {}85 self._server = tornado.httpserver.HTTPServer(self._app, **kwds)86 self._ioloop = tornado.ioloop.IOLoop()87 def start_server(httpd, ioloop, port):88 # TODO(b/147233568): Restrict this to local connections.89 host = '' # Bind to all90 ioloop.make_current()91 httpd.listen(port=port, address=host)92 ioloop.start()93 self._server_thread = threading.Thread(94 target=start_server,95 kwargs={96 'httpd': self._server,97 'ioloop': self._ioloop,98 'port': self._port99 })100 started = threading.Event()101 self._ioloop.add_callback(started.set)102 self._server_thread.start()...

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