blob: 1d21f5afb427ba05d1bf1285655c97bb99eb4fea [file] [log] [blame]
# Copyright (c) 2011 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.
"""Module containing methods and classes to interact with a devserver instance.
import logging
import multiprocessing
import os
import socket
import tempfile
import urllib2
from chromite.buildbot import constants
from chromite.lib import cros_build_lib
from chromite.lib import osutils
from chromite.lib import timeout_util
from chromite.lib import remote_access
def GenerateUpdateId(target, src, key, for_vm):
"""Returns a simple representation id of |target| and |src| paths.
target: Target image of the update payloads.
src: Base image to of the delta update payloads.
key: Private key used to sign the payloads.
for_vm: Whether the update payloads are to be used in a VM .
update_id = target
if src:
update_id = '->'.join([src, update_id])
if key:
update_id = '+'.join([update_id, key])
if not for_vm:
update_id = '+'.join([update_id, 'patched_kernel'])
return update_id
class DevServerException(Exception):
"""Thrown when the devserver fails to start up or responds with an error."""
class DevServerWrapper(multiprocessing.Process):
"""A Simple wrapper around a dev server instance."""
# Wait up to 15 minutes for the dev server to start. It can take a
# while to start when generating payloads in parallel.
def __init__(self, static_dir=None, port=None, log_dir=None, src_image=None,
"""Initialize a DevServerWrapper instance.
static_dir: The static directory to be used by the devserver.
port: The port to used by the devserver.
log_dir: Directory to store the log files.
src_image: The path to the image to be used as the base to
generate delta payloads.
board: Override board to pass to the devserver for xbuddy pathing.
super(DevServerWrapper, self).__init__()
self.devserver_bin = 'start_devserver'
self.port = 8080 if not port else port
self.src_image = src_image
self.board = board
self.tempdir = None
self.log_dir = log_dir
if not self.log_dir:
self.tempdir = osutils.TempDir(
self.log_dir = self.tempdir.tempdir
self.static_dir = static_dir
self.log_filename = os.path.join(self.log_dir, 'dev_server.log')
self._pid_file = self._GetPIDFilePath()
self._pid = None
def DownloadFile(cls, url, dest):
"""Download the file from the URL to a local path."""
if os.path.isdir(dest):
dest = os.path.join(dest, os.path.basename(url))'Downloading %s to %s', url, dest)
osutils.WriteFile(dest, DevServerWrapper.OpenURL(url), mode='wb')
def GetDevServerURL(cls, ip=None, port=None, sub_dir=None):
"""Returns the dev server url.
ip: IP address of the devserver. If not set, use the IP
address of this machine.
port: Port number of devserver.
sub_dir: The subdirectory of the devserver url.
ip = cros_build_lib.GetIPv4Address() if not ip else ip
port = 8080 if not port else port
url = 'http://%(ip)s:%(port)s' % {'ip': ip, 'port': str(port)}
if sub_dir:
url += '/' + sub_dir
return url
def OpenURL(cls, url, ignore_url_error=False, timeout=60):
"""Returns the HTTP response of a URL."""
logging.debug('Retrieving %s', url)
res = urllib2.urlopen(url, timeout=timeout)
except urllib2.HTTPError as e:
logging.error('Devserver responsded with an error!')
raise DevServerException(e)
except (urllib2.URLError, socket.timeout) as e:
if not ignore_url_error:
logging.error('Cannot connect to devserver!')
raise DevServerException(e)
def WipePayloadCache(cls, devserver_bin='start_devserver', static_dir=None):
"""Cleans up devserver cache of payloads.
devserver_bin: path to the devserver binary.
static_dir: path to use as the static directory of the devserver instance.
cros_build_lib.Info('Cleaning up previously generated payloads.')
cmd = [devserver_bin, '--clear_cache', '--exit']
if static_dir:
cmd.append('--static_dir=%s' % static_dir)
cmd, enter_chroot=True, print_cmd=False, combine_stdout_stderr=True,
redirect_stdout=True, redirect_stderr=True, cwd=constants.SOURCE_ROOT)
def IsReady(self):
"""Check if devserver is up and running."""
if not self.is_alive():
raise DevServerException('Devserver terminated unexpectedly!')
url = os.path.join('http://%s:%d' % (remote_access.LOCALHOST_IP, self.port),
if self.OpenURL(url, ignore_url_error=True, timeout=2):
return True
return False
def _GetPIDFilePath(self):
"""Returns pid file path."""
return tempfile.NamedTemporaryFile(prefix='devserver_wrapper',
def _GetPID(self):
"""Returns the pid read from the pid file."""
# Pid file was passed into the chroot.
return osutils.ReadFile(self._pid_file).rstrip()
def _WaitUntilStarted(self):
"""Wait until the devserver has started."""
timeout_util.WaitForReturnValue([True], self.IsReady,
except timeout_util.TimeoutError:
raise DevServerException('Devserver did not start')
def run(self):
"""Kicks off devserver in a separate process and waits for it to finish."""
# Truncate the log file if it already exists.
if os.path.exists(self.log_filename):
osutils.SafeUnlink(self.log_filename, sudo=True)
cmd = [self.devserver_bin,
'--port', str(self.port),
'--pidfile', cros_build_lib.ToChrootPath(self._pid_file),
'--logfile', cros_build_lib.ToChrootPath(self.log_filename)]
if self.static_dir:
'--static_dir=%s' % cros_build_lib.ToChrootPath(self.static_dir))
if self.src_image:
cmd.append('--src_image=%s' % cros_build_lib.ToChrootPath(self.src_image))
if self.board:
cmd.append('--board=%s' % self.board)
result = self._RunCommand(
cmd, enter_chroot=True,
cwd=constants.SOURCE_ROOT, error_code_ok=True,
redirect_stdout=True, combine_stdout_stderr=True)
if result.returncode != 0:
msg = ('Devserver failed to start!\n'
'--- Start output from the devserver startup command ---\n'
'--- End output from the devserver startup command ---'
) % result.output
def Start(self):
"""Starts a background devserver and waits for it to start.
Starts a background devserver and waits for it to start. Will only return
once devserver has started and running pid has been read.
self._pid = self._GetPID()
def Stop(self):
"""Kills the devserver instance with SIGTERM and SIGKILL if SIGTERM fails"""
if not self._pid:
logging.debug('No devserver running.')
logging.debug('Stopping devserver instance with pid %s', self._pid)
if self.is_alive():
self._RunCommand(['kill', self._pid])
logging.debug('Devserver not running!')
if self.is_alive():
logging.warning('Devserver is unstoppable. Killing with SIGKILL')
self._RunCommand(['kill', '-9', self._pid])
def PrintLog(self):
"""Print devserver output to stdout."""
print self.TailLog(num_lines='+1')
def TailLog(self, num_lines=50):
"""Returns the most recent |num_lines| lines of the devserver log file."""
fname = self.log_filename
if os.path.exists(fname):
result = self._RunCommand(['tail', '-n', str(num_lines), fname],
output = '--- Start output from %s ---' % fname
output += result.output
output += '--- End output from %s ---' % fname
return output
def _RunCommand(self, *args, **kwargs):
"""Runs a shell commmand."""
kwargs.setdefault('debug_level', logging.DEBUG)
return cros_build_lib.SudoRunCommand(*args, **kwargs)
class RemoteDevServerWrapper(DevServerWrapper):
"""A wrapper of a devserver on a remote device.
Devserver wrapper for RemoteDevice. This wrapper kills all existing
running devserver instances before startup, thus allowing one
devserver running at a time.
We assume there is no chroot on the device, thus we do not launch
devserver inside chroot.
# Shorter timeout because the remote devserver instance does not
# need to generate payloads.
PID_FILE_PATH = '/tmp/'
Your device does not have cherrypy package installed; cherrypy is
necessary for launching devserver on the device. Your device may be
running an older image (<R33-4986.0.0), where cherrypy is not
installed by default.
You can fix this with one of the following three options:
1. Update the device to a newer image with a USB stick.
2. Run 'cros deploy device cherrypy' to install cherrpy.
3. Run cros flash with --no-rootfs-update to update only the stateful
parition to a newer image (with the risk that the rootfs/stateful version
mismatch may cause some problems).
def __init__(self, remote_device, devserver_bin, **kwargs):
"""Initializes a RemoteDevserverPortal object with the remote device.
remote_device: A RemoteDevice object.
devserver_bin: The path to the devserver script on the device.
**kwargs: See DevServerWrapper documentation.
super(RemoteDevServerWrapper, self).__init__(**kwargs)
self.device = remote_device
self.devserver_bin = devserver_bin
self.hostname = remote_device.hostname
def _GetPID(self):
"""Returns the pid read from pid file."""
result = self._RunCommand(['cat', self._pid_file])
return result.output
def _GetPIDFilePath(self):
"""Returns the pid filename"""
return self.PID_FILE_PATH
def _RunCommand(self, *args, **kwargs):
"""Runs a remote shell command.
*args: See RemoteAccess.RemoteDevice documentation.
**kwargs: See RemoteAccess.RemoteDevice documentation.
kwargs.setdefault('debug_level', logging.DEBUG)
return self.device.RunCommand(*args, **kwargs)
def IsReady(self):
"""Returns True if devserver is ready to accept requests."""
if not self.is_alive():
raise DevServerException('Devserver terminated unexpectedly!')
url = os.path.join('' % self.port, 'check_health')
# Running wget through ssh because the port on the device is not
# accessible by default.
result = self.device.RunCommand(
['wget', url, '-q', '-O', '/dev/null'], error_code_ok=True)
return result.returncode == 0
def run(self):
"""Launches a devserver process on the device."""
self._RunCommand(['cat', '/dev/null', '>|', self.log_filename])
self._RunCommand(['pkill', os.path.basename(self.devserver_bin)],
cmd = ['python', self.devserver_bin,
'--port=%s' % str(self.port),
'--logfile=%s' % self.log_filename,
'--pidfile', self._pid_file]
if self.static_dir:
cmd.append('--static_dir=%s' % self.static_dir)'Starting devserver %s', self.GetDevServerURL(ip=self.hostname,
result = self._RunCommand(cmd, error_code_ok=True, redirect_stdout=True,
if result.returncode != 0:
msg = ('Remote devserver failed to start!\n'
'--- Start output from the devserver startup command ---\n'
'--- End output from the devserver startup command ---'
) % result.output
if 'ImportError: No module named cherrypy' in result.output:
def WipePayloadCache(cls, devserver_bin='start_devserver', static_dir=None):
"""Cleans up devserver cache of payloads."""
raise NotImplementedError()