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https://github.com/freedombox/FreedomBox.git
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4c30d5e8a5
Now that all firewall ports are explicitly specified for all services, it is safer to remove automatic infering of firewall service name from systemd service name. This Closes: #468 where firewall status is being shown for 'software upgrades'.
126 lines
4.5 KiB
Python
126 lines
4.5 KiB
Python
#
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# This file is part of Plinth.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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Framework for working with servers and their services.
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"""
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import collections
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from django.utils.translation import ugettext_lazy as _
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from plinth import action_utils, actions, cfg
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from plinth.signals import service_enabled
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from plinth.utils import format_lazy
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services = {}
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class Service(object):
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"""
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Representation of an application service provided by the machine
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containing information such as current status and ports required
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for operation.
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- service_id: unique service name. If possible this should be the name of
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the service's systemd unit file (without the extension).
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- name: service name as to be displayed in the GUI
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- is_enabled (optional): Boolean or a method returning Boolean
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- enable (optional): method
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- disable (optional): method
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- is_running (optional): Boolean or a method returning Boolean
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"""
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def __init__(self, service_id, name, ports=None, is_external=False,
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is_enabled=None, enable=None, disable=None, is_running=None):
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if ports is None:
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ports = []
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if is_enabled is None:
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is_enabled = self._default_is_enabled
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self.service_id = service_id
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self.name = name
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self.ports = ports
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self.is_external = is_external
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self._is_enabled = is_enabled
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self._enable = enable
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self._disable = disable
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self._is_running = is_running
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# Maintain a complete list of services
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assert(service_id not in services)
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services[service_id] = self
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def enable(self):
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if self._enable is None:
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actions.superuser_run('service', ['enable', self.service_id])
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else:
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self._call_or_return(self._enable)
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self.notify_enabled(None, True)
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def disable(self):
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if self._disable is None:
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actions.superuser_run('service', ['disable', self.service_id])
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else:
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self._call_or_return(self._disable)
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self.notify_enabled(None, False)
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def is_enabled(self):
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"""Return whether the service is enabled."""
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# TODO: we could cache the service state if we only use this service
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# interface to change service status.
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return self._call_or_return(self._is_enabled)
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def is_running(self):
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if self._is_running is None:
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return action_utils.service_is_running(self.service_id)
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else:
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return self._call_or_return(self._is_running)
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def notify_enabled(self, sender, enabled):
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"""Notify observers about change in state of service."""
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service_enabled.send_robust(sender=sender, service_id=self.service_id,
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enabled=enabled)
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def _call_or_return(self, obj):
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"""Calls obj if it's callable, returns it if it's Boolean."""
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if isinstance(obj, collections.Callable):
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return obj()
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elif type(obj) is bool:
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return obj
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else:
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message = 'obj is expected to be callable or a boolean.'
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raise ValueError(message)
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def _default_is_enabled(self):
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"""Returns is_enabled relying on a correct service_id"""
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return action_utils.service_is_enabled(self.service_id)
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def init():
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"""Register some misc. services that don't fit elsewhere."""
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Service('http', _('Web Server'), ports=['http'], is_external=True,
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is_enabled=True)
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Service('https', _('Web Server over Secure Socket Layer'), ports=['https'],
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is_external=True, is_enabled=True)
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Service('ssh', _('Secure Shell (SSH) Server'), ports=['ssh'],
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is_external=True, is_enabled=True)
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Service('plinth', format_lazy(_('{box_name} Web Interface (Plinth)'),
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box_name=_(cfg.box_name)),
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ports=['https'], is_external=True, is_enabled=True)
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