# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import atexit
import logging
import os
import urllib2
import urlparse
try:
from selenium import webdriver
except ImportError:
# Ignore import error, as this can happen when builder tries to call the
# setup method of test that imports chromedriver.
logging.error('selenium module failed to be imported.')
pass
from autotest_lib.client.bin import utils
from autotest_lib.client.common_lib.cros import chrome
CHROMEDRIVER_EXE_PATH = '/usr/local/chromedriver/chromedriver'
X_SERVER_DISPLAY = ':0'
X_AUTHORITY = '/home/chronos/.Xauthority'
class chromedriver(object):
"""Wrapper class, a context manager type, for tests to use Chrome Driver."""
def __init__(self, extra_chrome_flags=[], subtract_extra_chrome_flags=[],
extension_paths=[], username=None, password=None,
server_port=None, skip_cleanup=False, url_base=None,
extra_chromedriver_args=None, *args, **kwargs):
"""Initialize.
@param extra_chrome_flags: Extra chrome flags to pass to chrome, if any.
@param subtract_extra_chrome_flags: Remove default flags passed to
chrome by chromedriver, if any.
@param extension_paths: A list of paths to unzipped extensions. Note
that paths to crx files won't work.
@param username: Log in using this username instead of the default.
@param password: Log in using this password instead of the default.
@param server_port: Port number for the chromedriver server. If None,
an available port is chosen at random.
@param skip_cleanup: If True, leave the server and browser running
so that remote tests can run after this script
ends. Default is False.
@param url_base: Optional base url for chromedriver.
@param extra_chromedriver_args: List of extra arguments to forward to
the chromedriver binary, if any.
"""
self._cleanup = not skip_cleanup
assert os.geteuid() == 0, 'Need superuser privileges'
# Log in with telemetry
self._chrome = chrome.Chrome(extension_paths=extension_paths,
username=username,
password=password,
extra_browser_args=extra_chrome_flags)
self._browser = self._chrome.browser
# Close all tabs owned and opened by Telemetry, as these cannot be
# transferred to ChromeDriver.
self._browser.tabs[0].Close()
# Start ChromeDriver server
self._server = chromedriver_server(CHROMEDRIVER_EXE_PATH,
port=server_port,
skip_cleanup=skip_cleanup,
url_base=url_base,
extra_args=extra_chromedriver_args)
# Open a new tab using Chrome remote debugging. ChromeDriver expects
# a tab opened for remote to work. Tabs opened using Telemetry will be
# owned by Telemetry, and will be inaccessible to ChromeDriver.
urllib2.urlopen('http://localhost:%i/json/new' %
utils.get_chrome_remote_debugging_port())
chromeOptions = {'debuggerAddress':
('localhost:%d' %
utils.get_chrome_remote_debugging_port())}
capabilities = {'chromeOptions':chromeOptions}
# Handle to chromedriver, for chrome automation.
try:
self.driver = webdriver.Remote(command_executor=self._server.url,
desired_capabilities=capabilities)
except NameError:
logging.error('selenium module failed to be imported.')
raise
def __enter__(self):
return self
def __exit__(self, *args):
"""Clean up after running the test.
"""
if hasattr(self, 'driver') and self.driver:
self.driver.close()
del self.driver
if not hasattr(self, '_cleanup') or self._cleanup:
if hasattr(self, '_server') and self._server:
self._server.close()
del self._server
if hasattr(self, '_browser') and self._browser:
self._browser.Close()
del self._browser
def get_extension(self, extension_path):
"""Gets an extension by proxying to the browser.
@param extension_path: Path to the extension loaded in the browser.
@return: A telemetry extension object representing the extension.
"""
return self._chrome.get_extension(extension_path)
@property
def chrome_instance(self):
""" The chrome instance used by this chrome driver instance. """
return self._chrome
class chromedriver_server(object):
"""A running ChromeDriver server.
This code is migrated from chrome:
src/chrome/test/chromedriver/server/server.py
"""
def __init__(self, exe_path, port=None, skip_cleanup=False,
url_base=None, extra_args=None):
"""Starts the ChromeDriver server and waits for it to be ready.
Args:
exe_path: path to the ChromeDriver executable
port: server port. If None, an available port is chosen at random.
skip_cleanup: If True, leave the server running so that remote
tests can run after this script ends. Default is
False.
url_base: Optional base url for chromedriver.
extra_args: List of extra arguments to forward to the chromedriver
binary, if any.
Raises:
RuntimeError if ChromeDriver fails to start
"""
if not os.path.exists(exe_path):
raise RuntimeError('ChromeDriver exe not found at: ' + exe_path)
chromedriver_args = [exe_path]
if port:
# Allow remote connections if a port was specified
chromedriver_args.append('--whitelisted-ips')
else:
port = utils.get_unused_port()
chromedriver_args.append('--port=%d' % port)
self.url = 'http://localhost:%d' % port
if url_base:
chromedriver_args.append('--url-base=%s' % url_base)
self.url = urlparse.urljoin(self.url, url_base)
if extra_args:
chromedriver_args.extend(extra_args)
# TODO(ihf): Remove references to X after M45.
# Chromedriver will look for an X server running on the display
# specified through the DISPLAY environment variable.
os.environ['DISPLAY'] = X_SERVER_DISPLAY
os.environ['XAUTHORITY'] = X_AUTHORITY
self.bg_job = utils.BgJob(chromedriver_args, stderr_level=logging.DEBUG)
if self.bg_job is None:
raise RuntimeError('ChromeDriver server cannot be started')
try:
timeout_msg = 'Timeout on waiting for ChromeDriver to start.'
utils.poll_for_condition(self.is_running,
exception=utils.TimeoutError(timeout_msg),
timeout=10,
sleep_interval=.1)
except utils.TimeoutError:
self.close_bgjob()
raise RuntimeError('ChromeDriver server did not start')
logging.debug('Chrome Driver server is up and listening at port %d.',
port)
if not skip_cleanup:
atexit.register(self.close)
def is_running(self):
"""Returns whether the server is up and running."""
try:
urllib2.urlopen(self.url + '/status')
return True
except urllib2.URLError as e:
return False
def close_bgjob(self):
"""Close background job and log stdout and stderr."""
utils.nuke_subprocess(self.bg_job.sp)
utils.join_bg_jobs([self.bg_job], timeout=1)
result = self.bg_job.result
if result.stdout or result.stderr:
logging.info('stdout of Chrome Driver:\n%s', result.stdout)
logging.error('stderr of Chrome Driver:\n%s', result.stderr)
def close(self):
"""Kills the ChromeDriver server, if it is running."""
if self.bg_job is None:
return
try:
urllib2.urlopen(self.url + '/shutdown', timeout=10).close()
except:
pass
self.close_bgjob()