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117 lines
4 KiB
Python
117 lines
4 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright (c) 2015,Thibault Saunier <tsaunier@gnome.org>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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import os
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import time
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from . import loggable
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import subprocess
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class VirtualFrameBufferServer(loggable.Loggable):
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def __init__(self, options):
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loggable.Loggable.__init__(self)
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self.options = options
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def start(self):
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raise NotImplementedError
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def stop(self):
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raise NotImplementedError
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class Xvfb(VirtualFrameBufferServer):
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""" Class to run xvfb in a process."""
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def __init__(self, options):
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VirtualFrameBufferServer.__init__(self, options)
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self.display_id = ":27"
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self._process = None
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self._logsfile = None
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self._command = "Xvfb %s -screen 0 1920x1080x24" % self.display_id
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def _check_is_up(self, timeout=3, assume_true=True):
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""" Check if the xvfb is up, running a simple test based on xset. """
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start = time.time()
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while True:
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try:
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os.environ["DISPLAY"] = self.display_id
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subprocess.check_output(["xset", "q"],
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stderr=self._logsfile)
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print(("DISPLAY set to %s" % self.display_id))
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return True
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except subprocess.CalledProcessError:
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pass
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except FileNotFoundError:
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if assume_true:
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print('WARNING: xset not preset on the system,'
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' just wait for %s seconds and hope for the best.'
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' (this is what xvfb-run itself does anyway.)' % timeout)
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time.sleep(timeout)
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return assume_true
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if time.time() - start > timeout:
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return False
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time.sleep(1)
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def start(self):
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""" Start xvfb in a subprocess """
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self._logsfile = open(os.path.join(self.options.logsdir,
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"xvfb.logs"), 'w+')
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if self._check_is_up(assume_true=False):
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print("xvfb already running")
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return (True, None)
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print("Starting xvfb")
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try:
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self.debug("Launching xvfb: %s (logs in %s)", self._command, self._logsfile)
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self._process = subprocess.Popen(self._command.split(" "),
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stderr=self._logsfile,
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stdout=self._logsfile)
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self.debug("Launched xvfb")
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# Dirty way to avoid eating to much CPU...
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# good enough for us anyway.
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time.sleep(1)
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if self._check_is_up():
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print("Xvfb tarted")
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return (True, None)
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else:
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print("Failed starting xvfb")
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self._process.terminate()
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self._process = None
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except Exception as ex:
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return (False, "Could not launch %s %s\n"
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"Make sure Xvfb is installed" % (self._command, ex))
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def stop(self):
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""" Stop the xvfb subprocess if running. """
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if self._process:
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self._process.terminate()
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self._process = None
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self.debug("xvfb stopped")
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def get_virual_frame_buffer_server(options):
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"""
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Return a VirtualFrameBufferServer
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"""
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return Xvfb(options)
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