gstreamer/validate/launcher/vfb_server.py

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#!/usr/bin/env python3
#
# Copyright (c) 2015,Thibault Saunier <tsaunier@gnome.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
# Boston, MA 02110-1301, USA.
import os
import time
from . import loggable
import subprocess
class VirtualFrameBufferServer(loggable.Loggable):
def __init__(self, options):
loggable.Loggable.__init__(self)
self.options = options
def start(self):
raise NotImplementedError
def stop(self):
raise NotImplementedError
class Xvfb(VirtualFrameBufferServer):
""" Class to run xvfb in a process."""
def __init__(self, options):
VirtualFrameBufferServer.__init__(self, options)
self.display_id = ":27"
self._process = None
self._logsfile = None
self._command = "Xvfb %s -screen 0 1920x1080x24" % self.display_id
def _check_is_up(self, timeout=60):
""" Check if the xvfb is up, running a simple test based on wget. """
start = time.time()
while True:
try:
cdisplay = os.environ.get("DISPLAY", None)
os.environ["DISPLAY"] = self.display_id
subprocess.check_output(["xset", "q"],
stderr=self._logsfile)
print(("DISPLAY set to %s" % self.display_id))
return True
except subprocess.CalledProcessError:
pass
if time.time() - start > timeout:
return False
time.sleep(1)
def start(self):
""" Start xvfb in a subprocess """
self._logsfile = open(os.path.join(self.options.logsdir,
"xvfb.logs"), 'w+')
if self._check_is_up(timeout=2):
print("xvfb already running")
return (True, None)
print("Starting xvfb")
try:
self.debug("Launching xvfb: %s (logs in %s)", self._command, self._logsfile)
self._process = subprocess.Popen(self._command.split(" "),
stderr=self._logsfile,
stdout=self._logsfile)
self.debug("Launched xvfb")
# Dirty way to avoid eating to much CPU...
# good enough for us anyway.
time.sleep(1)
if self._check_is_up():
print("Xvfb tarted")
return (True, None)
else:
print("Failed starting xvfb")
self._process.terminate()
self._process = None
except Exception as ex:
return (False, "Could not launch %s %s\n"
"Make sure Xvfb is installed" % (self._command, ex))
def stop(self):
""" Stop the xvfb subprocess if running. """
if self._process:
self._process.terminate()
self._process = None
self.debug("xvfb stopped")
def get_virual_frame_buffer_server(options):
"""
Return a VirtualFrameBufferServer
"""
return Xvfb(options)