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How to use _server_thread method in autotest

Best Python code snippet using autotest_python

_background_server.py

Source:_background_server.py

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#      http://www.apache.org/licenses/LICENSE-2.08#9# 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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