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"""Models for manipulating containers and storage."""
import collections
import functools
import getpass
import json
import signal
import time
class Container(collections.UserDict):
"""Model for a container."""
def __init__(self, client, id, data):
"""Construct Container Model."""
super(Container, self).__init__(data)
self._client = client
self._id = id
with client() as podman:
self._refresh(podman)
assert self._id == self.data['id'],\
'Requested container id({}) does not match store id({})'.format(
self._id, self.id
)
def __getitem__(self, key):
"""Get items from parent dict."""
return super().__getitem__(key)
def _refresh(self, podman):
ctnr = podman.GetContainer(self._id)
super().update(ctnr['container'])
for k, v in self.data.items():
setattr(self, k, v)
if 'containerrunning' in self.data:
setattr(self, 'running', self.data['containerrunning'])
self.data['running'] = self.data['containerrunning']
return self
def refresh(self):
"""Refresh status fields for this container."""
with self._client() as podman:
return self._refresh(podman)
def attach(self, detach_key=None, no_stdin=False, sig_proxy=True):
"""Attach to running container."""
with self._client() as podman:
# TODO: streaming and port magic occur, need arguments
podman.AttachToContainer()
def processes(self):
"""Show processes running in container."""
with self._client() as podman:
results = podman.ListContainerProcesses(self.id)
yield from results['container']
def changes(self):
"""Retrieve container changes."""
with self._client() as podman:
results = podman.ListContainerChanges(self.id)
return results['container']
def kill(self, signal=signal.SIGTERM, wait=25):
"""Send signal to container.
default signal is signal.SIGTERM.
wait n of seconds, 0 waits forever.
"""
with self._client() as podman:
podman.KillContainer(self.id, signal)
timeout = time.time() + wait
while True:
self._refresh(podman)
if self.status != 'running':
return self
if wait and timeout < time.time():
raise TimeoutError()
time.sleep(0.5)
def _lower_hook(self):
"""Convert all keys to lowercase."""
@functools.wraps(self._lower_hook)
def wrapped(input):
return {k.lower(): v for (k, v) in input.items()}
return wrapped
def inspect(self):
"""Retrieve details about containers."""
with self._client() as podman:
results = podman.InspectContainer(self.id)
obj = json.loads(results['container'], object_hook=self._lower_hook())
return collections.namedtuple('ContainerInspect', obj.keys())(**obj)
def export(self, target):
"""Export container from store to tarball.
TODO: should there be a compress option, like images?
"""
with self._client() as podman:
results = podman.ExportContainer(self.id, target)
return results['tarfile']
def commit(self,
image_name,
*args,
changes=[],
message='',
pause=True,
**kwargs):
"""Create image from container.
All changes overwrite existing values.
See inspect() to obtain current settings.
Changes:
CMD=/usr/bin/zsh
ENTRYPOINT=/bin/sh date
ENV=TEST=test_containers.TestContainers.test_commit
EXPOSE=8888/tcp
LABEL=unittest=test_commit
USER=bozo:circus
VOLUME=/data
WORKDIR=/data/application
"""
# TODO: Clean up *args, **kwargs after Commit() is complete
try:
author = kwargs.get('author', getpass.getuser())
except Exception:
author = ''
for c in changes:
if c.startswith('LABEL=') and c.count('=') < 2:
raise ValueError(
'LABEL should have the format: LABEL=label=value, not {}'.
format(c))
with self._client() as podman:
results = podman.Commit(self.id, image_name, changes, author,
message, pause)
return results['image']
def start(self):
"""Start container, return container on success."""
with self._client() as podman:
podman.StartContainer(self.id)
return self._refresh(podman)
def stop(self, timeout=25):
"""Stop container, return id on success."""
with self._client() as podman:
podman.StopContainer(self.id, timeout)
return self._refresh(podman)
def remove(self, force=False):
"""Remove container, return id on success.
force=True, stop running container.
"""
with self._client() as podman:
results = podman.RemoveContainer(self.id, force)
return results['container']
def restart(self, timeout=25):
"""Restart container with timeout, return id on success."""
with self._client() as podman:
podman.RestartContainer(self.id, timeout)
return self._refresh(podman)
def rename(self, target):
"""Rename container, return id on success."""
with self._client() as podman:
# TODO: Need arguments
results = podman.RenameContainer()
# TODO: fixup objects cached information
return results['container']
def resize_tty(self, width, height):
"""Resize container tty."""
with self._client() as podman:
# TODO: magic re: attach(), arguments
podman.ResizeContainerTty()
def pause(self):
"""Pause container, return id on success."""
with self._client() as podman:
podman.PauseContainer(self.id)
return self._refresh(podman)
def unpause(self):
"""Unpause container, return id on success."""
with self._client() as podman:
podman.UnpauseContainer(self.id)
return self._refresh(podman)
def update_container(self, *args, **kwargs):
"""TODO: Update container..., return id on success."""
with self._client() as podman:
podman.UpdateContainer()
return self._refresh(podman)
def wait(self):
"""Wait for container to finish, return 'returncode'."""
with self._client() as podman:
results = podman.WaitContainer(self.id)
return int(results['exitcode'])
def stats(self):
"""Retrieve resource stats from the container."""
with self._client() as podman:
results = podman.GetContainerStats(self.id)
obj = results['container']
return collections.namedtuple('StatDetail', obj.keys())(**obj)
def logs(self, *args, **kwargs):
"""Retrieve container logs."""
with self._client() as podman:
results = podman.GetContainerLogs(self.id)
yield from results
class Containers(object):
"""Model for Containers collection."""
def __init__(self, client):
"""Construct model for Containers collection."""
self._client = client
def list(self):
"""List of containers in the container store."""
with self._client() as podman:
results = podman.ListContainers()
for cntr in results['containers']:
yield Container(self._client, cntr['id'], cntr)
def delete_stopped(self):
"""Delete all stopped containers."""
with self._client() as podman:
results = podman.DeleteStoppedContainers()
return results['containers']
def get(self, id):
"""Retrieve container details from store."""
with self._client() as podman:
cntr = podman.GetContainer(id)
return Container(self._client, cntr['container']['id'],
cntr['container'])
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