chrome/test/chromedriver/server/server.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import atexit
   6 import os
   7 import socket
   8 import subprocess
   9 import time
  10 import urllib2
  11
  12
  13 class Server(object):
  14   """A running ChromeDriver server."""
  15
  16   def __init__(self, exe_path, log_path=None):
  17     """Starts the ChromeDriver server and waits for it to be ready.
  18
  19     Args:
  20       exe_path: path to the ChromeDriver executable
  21       log_path: path to the log file
  22     Raises:
  23       RuntimeError if ChromeDriver fails to start
  24     """
  25     if not os.path.exists(exe_path):
  26       raise RuntimeError('ChromeDriver exe not found at: ' + exe_path)
  27
  28     port = self._FindOpenPort()
  29     chromedriver_args = [exe_path, '--port=%d' % port]
  30     if log_path:
  31       chromedriver_args.extend(['--verbose', '--log-path=%s' % log_path])
  32     self._process = subprocess.Popen(chromedriver_args)
  33     self._url = 'http://127.0.0.1:%d' % port
  34     if self._process is None:
  35       raise RuntimeError('ChromeDriver server cannot be started')
  36
  37     max_time = time.time() + 10
  38     while not self.IsRunning():
  39       if time.time() > max_time:
  40         self._process.terminate()
  41         raise RuntimeError('ChromeDriver server did not start')
  42       time.sleep(0.1)
  43
  44     atexit.register(self.Kill)
  45
  46   def _FindOpenPort(self):
  47     for port in range(9500, 10000):
  48       try:
  49         socket.create_connection(('127.0.0.1', port), 0.2).close()
  50       except socket.error:
  51         return port
  52     raise RuntimeError('Cannot find open port to launch ChromeDriver')
  53
  54   def GetUrl(self):
  55     return self._url
  56
  57   def IsRunning(self):
  58     """Returns whether the server is up and running."""
  59     try:
  60       urllib2.urlopen(self.GetUrl() + '/status')
  61       return True
  62     except urllib2.URLError:
  63       return False
  64
  65   def Kill(self):
  66     """Kills the ChromeDriver server, if it is running."""
  67     if self._process is None:
  68       return
  69
  70     try:
  71       urllib2.urlopen(self.GetUrl() + '/shutdown', timeout=10).close()
  72     except:
  73       self._process.terminate()
  74     self._process.wait()
  75     self._process = None