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Merge pull request #1356 from dnephin/use_labels_instead_of_names

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Use labels instead of names to identify containers
This commit is contained in:
Aanand Prasad 2015-05-18 17:38:46 +01:00
commit 1e6d912fbc
13 changed files with 282 additions and 122 deletions
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1
compose/__init__.py
View file

@ -1,4 +1,3 @@
from __future__ import unicode_literals
from .service import Service # noqa:flake8
__version__ = '1.3.0dev'

33
compose/cli/main.py
View file

@ -11,6 +11,7 @@ from docker.errors import APIError
import dockerpty
from .. import __version__
from .. import migration
from ..project import NoSuchService, ConfigurationError
from ..service import BuildError, CannotBeScaledError
from ..config import parse_environment
@ -81,20 +82,21 @@ class TopLevelCommand(Command):
-v, --version Print version and exit
Commands:
build Build or rebuild services
help Get help on a command
kill Kill containers
logs View output from containers
port Print the public port for a port binding
ps List containers
pull Pulls service images
restart Restart services
rm Remove stopped containers
run Run a one-off command
scale Set number of containers for a service
start Start services
stop Stop services
up Create and start containers
build Build or rebuild services
help Get help on a command
kill Kill containers
logs View output from containers
port Print the public port for a port binding
ps List containers
pull Pulls service images
restart Restart services
rm Remove stopped containers
run Run a one-off command
scale Set number of containers for a service
start Start services
stop Stop services
up Create and start containers
migrate_to_labels Recreate containers to add labels
"""
def docopt_options(self):
@ -482,6 +484,9 @@ class TopLevelCommand(Command):
params = {} if timeout is None else {'timeout': int(timeout)}
project.stop(service_names=service_names, **params)
def migrate_to_labels(self, project, _options):
migration.migrate_project_to_labels(project)
def list_containers(containers):
return ", ".join(c.name for c in containers)

6
compose/const.py Normal file
View file

@ -0,0 +1,6 @@
LABEL_CONTAINER_NUMBER = 'com.docker.compose.container-number'
LABEL_ONE_OFF = 'com.docker.compose.oneoff'
LABEL_PROJECT = 'com.docker.compose.project'
LABEL_SERVICE = 'com.docker.compose.service'
LABEL_VERSION = 'com.docker.compose.version'

14
compose/container.py
View file

@ -4,6 +4,8 @@ from __future__ import absolute_import
import six
from functools import reduce
from .const import LABEL_CONTAINER_NUMBER, LABEL_SERVICE
class Container(object):
"""
@ -58,14 +60,15 @@ class Container(object):
@property
def name_without_project(self):
return '_'.join(self.dictionary['Name'].split('_')[1:])
return '{0}_{1}'.format(self.labels.get(LABEL_SERVICE), self.number)
@property
def number(self):
try:
return int(self.name.split('_')[-1])
except ValueError:
return None
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):
@ -159,6 +162,7 @@ class Container(object):
self.has_been_inspected = True
return self.dictionary
# TODO: only used by tests, move to test module
def links(self):
links = []
for container in self.client.containers():

35
compose/migration.py Normal file
View file

@ -0,0 +1,35 @@
import logging
import re
from .container import get_container_name, Container
log = logging.getLogger(__name__)
# TODO: remove this section when migrate_project_to_labels is removed
NAME_RE = re.compile(r'^([^_]+)_([^_]+)_(run_)?(\d+)$')
def is_valid_name(name):
match = NAME_RE.match(name)
return match is not None
def add_labels(project, container, name):
project_name, service_name, one_off, number = NAME_RE.match(name).groups()
if project_name != project.name or service_name not in project.service_names:
return
service = project.get_service(service_name)
service.recreate_container(container)
def migrate_project_to_labels(project):
log.info("Running migration to labels for project %s", project.name)
client = project.client
for container in client.containers(all=True):
name = get_container_name(container)
if not is_valid_name(name):
continue
add_labels(project, Container.from_ps(client, container), name)

41
compose/project.py
View file

@ -1,13 +1,15 @@
from __future__ import unicode_literals
from __future__ import absolute_import
import logging
from functools import reduce
from .config import get_service_name_from_net, ConfigurationError
from .service import Service
from .container import Container
from docker.errors import APIError
from .config import get_service_name_from_net, ConfigurationError
from .const import LABEL_PROJECT, LABEL_ONE_OFF
from .service import Service, check_for_legacy_containers
from .container import Container
log = logging.getLogger(__name__)
@ -60,6 +62,12 @@ class Project(object):
self.services = services
self.client = client
def labels(self, one_off=False):
return [
'{0}={1}'.format(LABEL_PROJECT, self.name),
'{0}={1}'.format(LABEL_ONE_OFF, "True" if one_off else "False"),
]
@classmethod
def from_dicts(cls, name, service_dicts, client):
"""
@ -75,6 +83,10 @@ class Project(object):
volumes_from=volumes_from, **service_dict))
return project
@property
def service_names(self):
return [service.name for service in self.services]
def get_service(self, name):
"""
Retrieve a service by name. Raises NoSuchService
@ -102,7 +114,7 @@ class Project(object):
"""
if service_names is None or len(service_names) == 0:
return self.get_services(
service_names=[s.name for s in self.services],
service_names=self.service_names,
include_deps=include_deps
)
else:
@ -223,10 +235,21 @@ class Project(object):
service.remove_stopped(**options)
def containers(self, service_names=None, stopped=False, one_off=False):
return [Container.from_ps(self.client, container)
for container in self.client.containers(all=stopped)
for service in self.get_services(service_names)
if service.has_container(container, one_off=one_off)]
containers = [
Container.from_ps(self.client, container)
for container in self.client.containers(
all=stopped,
filters={'label': self.labels(one_off=one_off)})]
if not containers:
check_for_legacy_containers(
self.client,
self.name,
self.service_names,
stopped=stopped,
one_off=one_off)
return containers
def _inject_deps(self, acc, service):
net_name = service.get_net_name()

132
compose/service.py
View file

@ -10,7 +10,15 @@ import six
from docker.errors import APIError
from docker.utils import create_host_config, LogConfig
from . import __version__
from .config import DOCKER_CONFIG_KEYS, merge_environment
from .const import (
LABEL_CONTAINER_NUMBER,
LABEL_ONE_OFF,
LABEL_PROJECT,
LABEL_SERVICE,
LABEL_VERSION,
)
from .container import Container, get_container_name
from .progress_stream import stream_output, StreamOutputError
@ -78,28 +86,29 @@ class Service(object):
self.options = options
def containers(self, stopped=False, one_off=False):
return [Container.from_ps(self.client, container)
for container in self.client.containers(all=stopped)
if self.has_container(container, one_off=one_off)]
containers = [
Container.from_ps(self.client, container)
for container in self.client.containers(
all=stopped,
filters={'label': self.labels(one_off=one_off)})]
def has_container(self, container, one_off=False):
"""Return True if `container` was created to fulfill this service."""
name = get_container_name(container)
if not name or not is_valid_name(name, one_off):
return False
project, name, _number = parse_name(name)
return project == self.project and name == self.name
if not containers:
check_for_legacy_containers(
self.client,
self.project,
[self.name],
stopped=stopped,
one_off=one_off)
return containers
def get_container(self, number=1):
"""Return a :class:`compose.container.Container` for this service. The
container must be active, and match `number`.
"""
for container in self.client.containers():
if not self.has_container(container):
continue
_, _, container_number = parse_name(get_container_name(container))
if container_number == number:
return Container.from_ps(self.client, container)
labels = self.labels() + ['{0}={1}'.format(LABEL_CONTAINER_NUMBER, number)]
for container in self.client.containers(filters={'label': labels}):
return Container.from_ps(self.client, container)
raise ValueError("No container found for %s_%s" % (self.name, number))
@ -138,7 +147,6 @@ class Service(object):
# Create enough containers
containers = self.containers(stopped=True)
while len(containers) < desired_num:
log.info("Creating %s..." % self._next_container_name(containers))
containers.append(self.create_container(detach=True))
running_containers = []
@ -178,6 +186,7 @@ class Service(object):
insecure_registry=False,
do_build=True,
previous_container=None,
number=None,
**override_options):
"""
Create a container for this service. If the image doesn't exist, attempt to pull
@ -185,6 +194,7 @@ class Service(object):
"""
container_options = self._get_container_create_options(
override_options,
number or self._next_container_number(one_off=one_off),
one_off=one_off,
previous_container=previous_container,
)
@ -209,7 +219,6 @@ class Service(object):
"""
containers = self.containers(stopped=True)
if not containers:
log.info("Creating %s..." % self._next_container_name(containers))
container = self.create_container(
insecure_registry=insecure_registry,
do_build=do_build,
@ -256,6 +265,7 @@ class Service(object):
new_container = self.create_container(
do_build=False,
previous_container=container,
number=container.labels.get(LABEL_CONTAINER_NUMBER),
**override_options)
self.start_container(new_container)
container.remove()
@ -280,7 +290,6 @@ class Service(object):
containers = self.containers(stopped=True)
if not containers:
log.info("Creating %s..." % self._next_container_name(containers))
new_container = self.create_container(
insecure_registry=insecure_registry,
detach=detach,
@ -302,14 +311,19 @@ class Service(object):
else:
return
def _next_container_name(self, all_containers, one_off=False):
bits = [self.project, self.name]
if one_off:
bits.append('run')
return '_'.join(bits + [str(self._next_container_number(all_containers))])
def get_container_name(self, number, one_off=False):
# TODO: Implement issue #652 here
return build_container_name(self.project, self.name, number, one_off)
def _next_container_number(self, all_containers):
numbers = [parse_name(c.name).number for c in all_containers]
# TODO: this would benefit from github.com/docker/docker/pull/11943
# to remove the need to inspect every container
def _next_container_number(self, one_off=False):
numbers = [
Container.from_ps(self.client, container).number
for container in self.client.containers(
all=True,
filters={'label': self.labels(one_off=one_off)})
]
return 1 if not numbers else max(numbers) + 1
def _get_links(self, link_to_self):
@ -369,6 +383,7 @@ class Service(object):
def _get_container_create_options(
self,
override_options,
number,
one_off=False,
previous_container=None):
container_options = dict(
@ -376,9 +391,7 @@ class Service(object):
for k in DOCKER_CONFIG_KEYS if k in self.options)
container_options.update(override_options)
container_options['name'] = self._next_container_name(
self.containers(stopped=True, one_off=one_off),
one_off)
container_options['name'] = self.get_container_name(number, one_off)
# If a qualified hostname was given, split it into an
# unqualified hostname and a domainname unless domainname
@ -419,6 +432,11 @@ class Service(object):
if self.can_be_built():
container_options['image'] = self.full_name
container_options['labels'] = build_container_labels(
container_options.get('labels', {}),
self.labels(one_off=one_off),
number)
# Delete options which are only used when starting
for key in DOCKER_START_KEYS:
container_options.pop(key, None)
@ -520,6 +538,13 @@ class Service(object):
"""
return '%s_%s' % (self.project, self.name)
def labels(self, one_off=False):
return [
'{0}={1}'.format(LABEL_PROJECT, self.project),
'{0}={1}'.format(LABEL_SERVICE, self.name),
'{0}={1}'.format(LABEL_ONE_OFF, "True" if one_off else "False")
]
def can_be_scaled(self):
for port in self.options.get('ports', []):
if ':' in str(port):
@ -585,23 +610,44 @@ def merge_volume_bindings(volumes_option, previous_container):
return volume_bindings
NAME_RE = re.compile(r'^([^_]+)_([^_]+)_(run_)?(\d+)$')
def is_valid_name(name, one_off=False):
match = NAME_RE.match(name)
if match is None:
return False
def build_container_name(project, service, number, one_off=False):
bits = [project, service]
if one_off:
return match.group(3) == 'run_'
else:
return match.group(3) is None
bits.append('run')
return '_'.join(bits + [str(number)])
def parse_name(name):
match = NAME_RE.match(name)
(project, service_name, _, suffix) = match.groups()
return ServiceName(project, service_name, int(suffix))
def build_container_labels(label_options, service_labels, number, one_off=False):
labels = label_options or {}
labels.update(label.split('=', 1) for label in service_labels)
labels[LABEL_CONTAINER_NUMBER] = str(number)
labels[LABEL_VERSION] = __version__
return labels
def check_for_legacy_containers(
client,
project,
services,
stopped=False,
one_off=False):
"""Check if there are containers named using the old naming convention
and warn the user that those containers may need to be migrated to
using labels, so that compose can find them.
"""
for container in client.containers(all=stopped):
name = get_container_name(container)
for service in services:
prefix = '%s_%s_%s' % (project, service, 'run_' if one_off else '')
if not name.startswith(prefix):
continue
log.warn(
"Compose found a found a container named %s without any "
"labels. As of compose 1.3.0 containers are identified with "
"labels instead of naming convention. If you'd like compose "
"to use this container, please run "
"`docker-compose --migrate-to-labels`" % (name,))
def parse_restart_spec(restart_config):