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# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Helpers to run docker instances as jobs."""
import jobset
import tempfile
import time
import uuid
import os
import subprocess
_DEVNULL = open(os.devnull, 'w')
def wait_for_file(filepath, timeout_seconds=15):
"""Wait until given file exists and returns its content."""
started = time.time()
while time.time() - started < timeout_seconds:
if os.path.isfile(filepath):
with open(filepath, 'r') as f:
content = f.read()
# make sure we don't return empty content
if content:
return content
time.sleep(1)
raise Exception('Failed to read file %s.' % filepath)
def docker_mapped_port(cid, port):
"""Get port mapped to internal given internal port for given container."""
output = subprocess.check_output('docker port %s %s' % (cid, port), shell=True)
return int(output.split(':', 2)[1])
def finish_jobs(jobs):
"""Kills given docker containers and waits for corresponding jobs to finish"""
for job in jobs:
job.kill(suppress_failure=True)
while any(job.is_running() for job in jobs):
time.sleep(1)
def image_exists(image):
"""Returns True if given docker image exists."""
return subprocess.call(['docker','inspect', image],
stdout=_DEVNULL,
stderr=_DEVNULL) == 0
def remove_image(image, skip_nonexistent=False, max_retries=10):
"""Attempts to remove docker image with retries."""
if skip_nonexistent and not image_exists(image):
return True
for attempt in range(0, max_retries):
if subprocess.call(['docker','rmi', '-f', image]) == 0:
return True
time.sleep(2)
print 'Failed to remove docker image %s' % image
return False
class DockerJob:
"""Encapsulates a job"""
def __init__(self, spec):
self._spec = spec
self._job = jobset.Job(spec, bin_hash=None, newline_on_success=True, travis=True, add_env={}, xml_report=None)
self._cidfile = spec.cidfile
self._cid = None
def cid(self):
"""Gets cid of this container"""
if not self._cid:
self._cid = wait_for_file(self._cidfile)
return self._cid
def mapped_port(self, port):
return docker_mapped_port(self.cid(), port)
def kill(self, suppress_failure=False):
"""Sends kill signal to the container."""
if suppress_failure:
self._job.suppress_failure_message()
return subprocess.call(['docker','kill', self.cid()]) == 0
def is_running(self):
"""Polls a job and returns True if given job is still running."""
return self._job.state(jobset.NoCache()) == jobset._RUNNING
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