export_util.py

#!/usr/bin/env python

#   Copyright 2015-2016 Scott Bezek and the splitflap contributors
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

import logging
import os
import subprocess
import sys
import tempfile
import time

from contextlib import contextmanager

repo_root = os.path.dirname(os.path.abspath(__file__))
sys.path.append(repo_root)

from thirdparty.xvfbwrapper.xvfbwrapper import Xvfb

logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger(__name__)

class PopenContext(subprocess.Popen):
    def __enter__(self):
        return self
    def __exit__(self, type, value, traceback):
        if self.stdout:
            self.stdout.close()
        if self.stderr:
            self.stderr.close()
        if self.stdin:
            self.stdin.close()
        if type:
            self.terminate()
        # Wait for the process to terminate, to avoid zombies.
        self.wait()

def xdotool(command):
    return subprocess.check_output(['xdotool'] + command)

def wait_for_window(name, window_regex, timeout=100):
    DELAY = 0.5
    logger.info('Waiting for %s window...', name)
    for i in range(int(timeout/DELAY)):
        try:
            xdotool(['search', '--name', window_regex])
            logger.info('Found %s window', name)
            return
        except subprocess.CalledProcessError:
            pass
        time.sleep(DELAY)
    raise RuntimeError('Timed out waiting for %s window' % name)

@contextmanager
def recorded_xvfb(video_filename, **xvfb_args):
    with Xvfb(**xvfb_args):
        with PopenContext([
                'recordmydesktop',
                '--no-sound',
                '--no-frame',
                '--on-the-fly-encoding',
                '-o', video_filename], close_fds=True) as screencast_proc: 
            yield
            screencast_proc.terminate()