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Mini Shell
Mini Shell
from __future__ import absolute_import
from __future__ import unicode_literals
from functools import reduce
import six
from .const import LABEL_CONTAINER_NUMBER
from .const import LABEL_PROJECT
from .const import LABEL_SERVICE
class Container(object):
"""
Represents a Docker container, constructed from the output of
GET /containers/:id:/json.
"""
def __init__(self, client, dictionary, has_been_inspected=False):
self.client = client
self.dictionary = dictionary
self.has_been_inspected = has_been_inspected
self.log_stream = None
@classmethod
def from_ps(cls, client, dictionary, **kwargs):
"""
Construct a container object from the output of GET /containers/json.
"""
name = get_container_name(dictionary)
if name is None:
return None
new_dictionary = {
'Id': dictionary['Id'],
'Image': dictionary['Image'],
'Name': '/' + name,
}
return cls(client, new_dictionary, **kwargs)
@classmethod
def from_id(cls, client, id):
return cls(client, client.inspect_container(id), has_been_inspected=True)
@classmethod
def create(cls, client, **options):
response = client.create_container(**options)
return cls.from_id(client, response['Id'])
@property
def id(self):
return self.dictionary['Id']
@property
def image(self):
return self.dictionary['Image']
@property
def image_config(self):
return self.client.inspect_image(self.image)
@property
def short_id(self):
return self.id[:12]
@property
def name(self):
return self.dictionary['Name'][1:]
@property
def service(self):
return self.labels.get(LABEL_SERVICE)
@property
def name_without_project(self):
project = self.labels.get(LABEL_PROJECT)
if self.name.startswith('{0}_{1}'.format(project, self.service)):
return '{0}_{1}'.format(self.service, self.number)
else:
return self.name
@property
def number(self):
number = self.labels.get(LABEL_CONTAINER_NUMBER)
if not number:
raise ValueError("Container {0} does not have a {1} label".format(
self.short_id, LABEL_CONTAINER_NUMBER))
return int(number)
@property
def ports(self):
self.inspect_if_not_inspected()
return self.get('NetworkSettings.Ports') or {}
@property
def human_readable_ports(self):
def format_port(private, public):
if not public:
return [private]
return [
'{HostIp}:{HostPort}->{private}'.format(private=private, **pub)
for pub in public
]
return ', '.join(
','.join(format_port(*item))
for item in sorted(six.iteritems(self.ports))
)
@property
def labels(self):
return self.get('Config.Labels') or {}
@property
def stop_signal(self):
return self.get('Config.StopSignal')
@property
def log_config(self):
return self.get('HostConfig.LogConfig') or None
@property
def human_readable_state(self):
if self.is_paused:
return 'Paused'
if self.is_restarting:
return 'Restarting'
if self.is_running:
return 'Ghost' if self.get('State.Ghost') else 'Up'
else:
return 'Exit %s' % self.get('State.ExitCode')
@property
def human_readable_command(self):
entrypoint = self.get('Config.Entrypoint') or []
cmd = self.get('Config.Cmd') or []
return ' '.join(entrypoint + cmd)
@property
def environment(self):
def parse_env(var):
if '=' in var:
return var.split("=", 1)
return var, None
return dict(parse_env(var) for var in self.get('Config.Env') or [])
@property
def exit_code(self):
return self.get('State.ExitCode')
@property
def is_running(self):
return self.get('State.Running')
@property
def is_restarting(self):
return self.get('State.Restarting')
@property
def is_paused(self):
return self.get('State.Paused')
@property
def log_driver(self):
return self.get('HostConfig.LogConfig.Type')
@property
def has_api_logs(self):
log_type = self.log_driver
return not log_type or log_type in ('json-file', 'journald')
def attach_log_stream(self):
"""A log stream can only be attached if the container uses a json-file
log driver.
"""
if self.has_api_logs:
self.log_stream = self.attach(stdout=True, stderr=True, stream=True)
def get(self, key):
"""Return a value from the container or None if the value is not set.
:param key: a string using dotted notation for nested dictionary
lookups
"""
self.inspect_if_not_inspected()
def get_value(dictionary, key):
return (dictionary or {}).get(key)
return reduce(get_value, key.split('.'), self.dictionary)
def get_local_port(self, port, protocol='tcp'):
port = self.ports.get("%s/%s" % (port, protocol))
return "{HostIp}:{HostPort}".format(**port[0]) if port else None
def get_mount(self, mount_dest):
for mount in self.get('Mounts'):
if mount['Destination'] == mount_dest:
return mount
return None
def start(self, **options):
return self.client.start(self.id, **options)
def stop(self, **options):
return self.client.stop(self.id, **options)
def pause(self, **options):
return self.client.pause(self.id, **options)
def unpause(self, **options):
return self.client.unpause(self.id, **options)
def kill(self, **options):
return self.client.kill(self.id, **options)
def restart(self, **options):
return self.client.restart(self.id, **options)
def remove(self, **options):
return self.client.remove_container(self.id, **options)
def create_exec(self, command, **options):
return self.client.exec_create(self.id, command, **options)
def start_exec(self, exec_id, **options):
return self.client.exec_start(exec_id, **options)
def rename_to_tmp_name(self):
"""Rename the container to a hopefully unique temporary container name
by prepending the short id.
"""
self.client.rename(
self.id,
'%s_%s' % (self.short_id, self.name)
)
def inspect_if_not_inspected(self):
if not self.has_been_inspected:
self.inspect()
def wait(self):
return self.client.wait(self.id)
def logs(self, *args, **kwargs):
return self.client.logs(self.id, *args, **kwargs)
def inspect(self):
self.dictionary = self.client.inspect_container(self.id)
self.has_been_inspected = True
return self.dictionary
def attach(self, *args, **kwargs):
return self.client.attach(self.id, *args, **kwargs)
def __repr__(self):
return '<Container: %s (%s)>' % (self.name, self.id[:6])
def __eq__(self, other):
if type(self) != type(other):
return False
return self.id == other.id
def __hash__(self):
return self.id.__hash__()
def get_container_name(container):
if not container.get('Name') and not container.get('Names'):
return None
# inspect
if 'Name' in container:
return container['Name']
# ps
shortest_name = min(container['Names'], key=lambda n: len(n.split('/')))
return shortest_name.split('/')[-1]
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