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# Copyright 2015 gRPC authors.
#
# 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.
"""Helpers to run docker instances as jobs."""
from __future__ import print_function
import tempfile
import time
import uuid
import os
import subprocess
import jobset
_DEVNULL = open(os.devnull, 'w')
def random_name(base_name):
"""Randomizes given base name."""
return '%s_%s' % (base_name, uuid.uuid4())
def docker_kill(cid):
"""Kills a docker container. Returns True if successful."""
return subprocess.call(
['docker', 'kill', str(cid)],
stdin=subprocess.PIPE,
stdout=_DEVNULL,
stderr=subprocess.STDOUT) == 0
def docker_mapped_port(cid, port, timeout_seconds=15):
"""Get port mapped to internal given internal port for given container."""
started = time.time()
while time.time() - started < timeout_seconds:
try:
output = subprocess.check_output(
'docker port %s %s' % (cid, port), stderr=_DEVNULL, shell=True)
return int(output.split(':', 2)[1])
except subprocess.CalledProcessError as e:
pass
raise Exception('Failed to get exposed port %s for container %s.' % (port,
cid))
def wait_for_healthy(cid, shortname, timeout_seconds):
"""Wait timeout_seconds for the container to become healthy"""
started = time.time()
while time.time() - started < timeout_seconds:
try:
output = subprocess.check_output(
[
'docker', 'inspect', '--format="{{.State.Health.Status}}"',
cid
],
stderr=_DEVNULL)
if output.strip('\n') == 'healthy':
return
except subprocess.CalledProcessError as e:
pass
time.sleep(1)
raise Exception('Timed out waiting for %s (%s) to pass health check' %
(shortname, cid))
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],
stdin=subprocess.PIPE,
stdout=_DEVNULL,
stderr=subprocess.STDOUT) == 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],
stdin=subprocess.PIPE,
stdout=_DEVNULL,
stderr=subprocess.STDOUT) == 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, newline_on_success=True, travis=True, add_env={})
self._container_name = spec.container_name
def mapped_port(self, port):
return docker_mapped_port(self._container_name, port)
def wait_for_healthy(self, timeout_seconds):
wait_for_healthy(self._container_name, self._spec.shortname,
timeout_seconds)
def kill(self, suppress_failure=False):
"""Sends kill signal to the container."""
if suppress_failure:
self._job.suppress_failure_message()
return docker_kill(self._container_name)
def is_running(self):
"""Polls a job and returns True if given job is still running."""
return self._job.state() == jobset._RUNNING
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