/usr/lib/python2.7/dist-packages/pylxd/models/container.py is in python-pylxd 2.2.6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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#
# 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 collections
import time
import six
from six.moves.urllib import parse
try:
from ws4py.client import WebSocketBaseClient
from ws4py.manager import WebSocketManager
_ws4py_installed = True
except ImportError: # pragma: no cover
WebSocketBaseClient = object
_ws4py_installed = False
from pylxd import managers
from pylxd.models import _model as model
class ContainerState(object):
"""A simple object for representing container state."""
def __init__(self, **kwargs):
for key, value in six.iteritems(kwargs):
setattr(self, key, value)
_ContainerExecuteResult = collections.namedtuple(
'ContainerExecuteResult',
['exit_code', 'stdout', 'stderr'])
class Container(model.Model):
"""An LXD Container.
This class is not intended to be used directly, but rather to be used
via `Client.containers.create`.
"""
architecture = model.Attribute()
config = model.Attribute()
created_at = model.Attribute()
devices = model.Attribute()
ephemeral = model.Attribute()
expanded_config = model.Attribute()
expanded_devices = model.Attribute()
name = model.Attribute(readonly=True)
description = model.Attribute()
profiles = model.Attribute()
status = model.Attribute(readonly=True)
last_used_at = model.Attribute(readonly=True)
status_code = model.Attribute(readonly=True)
stateful = model.Attribute(readonly=True)
snapshots = model.Manager()
files = model.Manager()
@property
def api(self):
return self.client.api.containers[self.name]
class FilesManager(object):
"""A pseudo-manager for namespacing file operations."""
def __init__(self, client, container):
self._client = client
self._container = container
def put(self, filepath, data, mode=None, uid=None, gid=None):
"""Push a file to the container.
This pushes a single file to the containers file system named by
the `filepath`.
:param filepath: The path in the container to to store the data in.
:type filepath: str
:param data: The data to store in the file.
:type data: bytes or str
:param mode: The unit mode to store the file with. The default of
None stores the file with the current mask of 0700, which is
the lxd default.
:type mode: oct | int | str
:param uid: The uid to use inside the container. Default of None
results in 0 (root).
:type uid: int
:param gid: The gid to use inside the container. Default of None
results in 0 (root).
:type gid: int
:returns: True if the file store succeeded otherwise False.
:rtype: Bool
"""
headers = {}
if mode is not None:
if isinstance(mode, int):
mode = format(mode, 'o')
if not isinstance(mode, six.string_types):
raise ValueError("'mode' parameter must be int or string")
if not mode.startswith('0'):
mode = '0{}'.format(mode)
headers['X-LXD-mode'] = mode
if uid is not None:
headers['X-LXD-uid'] = str(uid)
if gid is not None:
headers['X-LXD-gid'] = str(gid)
response = (self._client.api.containers[self._container.name]
.files.post(params={'path': filepath},
data=data,
headers=headers or None))
return response.status_code == 200
def delete_available(self):
"""File deletion is an extension API and may not be available.
https://github.com/lxc/lxd/blob/master/doc/api-extensions.md#file_delete
"""
return u'file_delete' in self._client.host_info['api_extensions']
def delete(self, filepath):
if self.delete_available():
response = self._client.api.containers[
self._container.name].files.delete(
params={'path': filepath})
return response.status_code == 200
else:
raise ValueError(
'File Deletion is not available for this host')
def get(self, filepath):
response = (self._client.api.containers[self._container.name]
.files.get(params={'path': filepath}))
return response.content
@classmethod
def exists(cls, client, name):
"""Determine whether a container exists."""
try:
client.containers.get(name)
return True
except cls.NotFound:
return False
@classmethod
def get(cls, client, name):
"""Get a container by name."""
response = client.api.containers[name].get()
container = cls(client, **response.json()['metadata'])
return container
@classmethod
def all(cls, client):
"""Get all containers.
Containers returned from this method will only have the name
set, as that is the only property returned from LXD. If more
information is needed, `Container.sync` is the method call
that should be used.
"""
response = client.api.containers.get()
containers = []
for url in response.json()['metadata']:
name = url.split('/')[-1]
containers.append(cls(client, name=name))
return containers
@classmethod
def create(cls, client, config, wait=False):
"""Create a new container config."""
response = client.api.containers.post(json=config)
if wait:
client.operations.wait_for_operation(response.json()['operation'])
return cls(client, name=config['name'])
def __init__(self, *args, **kwargs):
super(Container, self).__init__(*args, **kwargs)
self.snapshots = managers.SnapshotManager(self.client, self)
self.files = self.FilesManager(self.client, self)
def rename(self, name, wait=False):
"""Rename a container."""
response = self.api.post(json={'name': name})
if wait:
self.client.operations.wait_for_operation(
response.json()['operation'])
self.name = name
def _set_state(self, state, timeout=30, force=True, wait=False):
response = self.api.state.put(json={
'action': state,
'timeout': timeout,
'force': force
})
if wait:
self.client.operations.wait_for_operation(
response.json()['operation'])
if 'status' in self.__dirty__:
del self.__dirty__[self.__dirty__.index('status')]
if self.ephemeral and state == 'stop':
self.client = None
else:
self.sync()
def state(self):
response = self.api.state.get()
state = ContainerState(**response.json()['metadata'])
return state
def start(self, timeout=30, force=True, wait=False):
"""Start the container."""
return self._set_state('start',
timeout=timeout,
force=force,
wait=wait)
def stop(self, timeout=30, force=True, wait=False):
"""Stop the container."""
return self._set_state('stop',
timeout=timeout,
force=force,
wait=wait)
def restart(self, timeout=30, force=True, wait=False):
"""Restart the container."""
return self._set_state('restart',
timeout=timeout,
force=force,
wait=wait)
def freeze(self, timeout=30, force=True, wait=False):
"""Freeze the container."""
return self._set_state('freeze',
timeout=timeout,
force=force,
wait=wait)
def unfreeze(self, timeout=30, force=True, wait=False):
"""Unfreeze the container."""
return self._set_state('unfreeze',
timeout=timeout,
force=force,
wait=wait)
def execute(self, commands, environment={}):
"""Execute a command on the container.
In pylxd 2.2, this method will be renamed `execute` and the existing
`execute` method removed.
"""
if not _ws4py_installed:
raise ValueError(
'This feature requires the optional ws4py library.')
if isinstance(commands, six.string_types):
raise TypeError("First argument must be a list.")
response = self.api['exec'].post(json={
'command': commands,
'environment': environment,
'wait-for-websocket': True,
'interactive': False,
})
fds = response.json()['metadata']['metadata']['fds']
operation_id = response.json()['operation'].split('/')[-1]
parsed = parse.urlparse(
self.client.api.operations[operation_id].websocket._api_endpoint)
with managers.web_socket_manager(WebSocketManager()) as manager:
stdin = _StdinWebsocket(self.client.websocket_url)
stdin.resource = '{}?secret={}'.format(parsed.path, fds['0'])
stdin.connect()
stdout = _CommandWebsocketClient(
manager, self.client.websocket_url)
stdout.resource = '{}?secret={}'.format(parsed.path, fds['1'])
stdout.connect()
stderr = _CommandWebsocketClient(
manager, self.client.websocket_url)
stderr.resource = '{}?secret={}'.format(parsed.path, fds['2'])
stderr.connect()
manager.start()
while len(manager.websockets.values()) > 0:
time.sleep(.1)
operation = self.client.operations.get(operation_id)
return _ContainerExecuteResult(
operation.metadata['return'], stdout.data, stderr.data)
def migrate(self, new_client, wait=False):
"""Migrate a container.
Destination host information is contained in the client
connection passed in.
If the container is running, it either must be shut down
first or criu must be installed on the source and destination
machines.
"""
if self.api.scheme in ('http+unix',):
raise ValueError('Cannot migrate from a local client connection')
return new_client.containers.create(
self.generate_migration_data(), wait=wait)
def generate_migration_data(self):
"""Generate the migration data.
This method can be used to handle migrations where the client
connection uses the local unix socket. For more information on
migration, see `Container.migrate`.
"""
self.sync() # Make sure the object isn't stale
response = self.api.post(json={'migration': True})
operation = self.client.operations.get(response.json()['operation'])
operation_url = self.client.api.operations[operation.id]._api_endpoint
secrets = response.json()['metadata']['metadata']
cert = self.client.host_info['environment']['certificate']
return {
'name': self.name,
'architecture': self.architecture,
'config': self.config,
'devices': self.devices,
'epehemeral': self.ephemeral,
'default': self.profiles,
'source': {
'type': 'migration',
'operation': operation_url,
'mode': 'pull',
'certificate': cert,
'secrets': secrets,
}
}
def publish(self, public=False, wait=False):
"""Publish a container as an image.
The container must be stopped in order publish it as an image. This
method does not enforce that constraint, so a LXDAPIException may be
raised if this method is called on a running container.
If wait=True, an Image is returned.
"""
data = {
'public': public,
'source': {
'type': 'container',
'name': self.name,
}
}
response = self.client.api.images.post(json=data)
if wait:
operation = self.client.operations.wait_for_operation(
response.json()['operation'])
return self.client.images.get(operation.metadata['fingerprint'])
class _CommandWebsocketClient(WebSocketBaseClient): # pragma: no cover
def __init__(self, manager, *args, **kwargs):
self.manager = manager
super(_CommandWebsocketClient, self).__init__(*args, **kwargs)
def handshake_ok(self):
self.manager.add(self)
self.buffer = []
def received_message(self, message):
if len(message.data) == 0:
self.close()
self.manager.remove(self)
if message.encoding:
self.buffer.append(message.data.decode(message.encoding))
else:
self.buffer.append(message.data.decode('utf-8'))
@property
def data(self):
return ''.join(self.buffer)
class _StdinWebsocket(WebSocketBaseClient): # pragma: no cover
"""A websocket client for handling stdin.
The nature of stdin in Container.execute means that we don't
ever use this connection. It is closed as soon as it completes
the handshake.
"""
def handshake_ok(self):
self.close()
class Snapshot(model.Model):
"""A container snapshot."""
name = model.Attribute()
created_at = model.Attribute()
stateful = model.Attribute()
container = model.Parent()
@property
def api(self):
return self.client.api.containers[
self.container.name].snapshots[self.name]
@classmethod
def get(cls, client, container, name):
response = client.api.containers[
container.name].snapshots[name].get()
snapshot = cls(
client, container=container,
**response.json()['metadata'])
# Snapshot names are namespaced in LXD, as
# container-name/snapshot-name. We hide that implementation
# detail.
snapshot.name = snapshot.name.split('/')[-1]
return snapshot
@classmethod
def all(cls, client, container):
response = client.api.containers[container.name].snapshots.get()
return [cls(
client, name=snapshot.split('/')[-1],
container=container)
for snapshot in response.json()['metadata']]
@classmethod
def create(cls, client, container, name, stateful=False, wait=False):
response = client.api.containers[container.name].snapshots.post(json={
'name': name, 'stateful': stateful})
snapshot = cls(client, container=container, name=name)
if wait:
client.operations.wait_for_operation(response.json()['operation'])
return snapshot
def rename(self, new_name, wait=False):
"""Rename a snapshot."""
response = self.api.post(json={'name': new_name})
if wait:
self.client.operations.wait_for_operation(
response.json()['operation'])
self.name = new_name
def publish(self, public=False, wait=False):
"""Publish a snapshot as an image.
If wait=True, an Image is returned.
This functionality is currently broken in LXD. Please see
https://github.com/lxc/lxd/issues/2201 - The implementation
here is mostly a guess. Once that bug is fixed, we can verify
that this works, or file a bug to fix it appropriately.
"""
data = {
'public': public,
'source': {
'type': 'snapshot',
'name': '{}/{}'.format(self.container.name, self.name),
}
}
response = self.client.api.images.post(json=data)
if wait:
operation = self.client.operations.wait_for_operation(
response.json()['operation'])
return self.client.images.get(operation.metadata['fingerprint'])
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