149 lines
4.5 KiB
Python
149 lines
4.5 KiB
Python
from functools import partial
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from django.db.models.loading import get_model
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from django.utils import timezone
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from django.utils.translation import ugettext_lazy as _
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from orchestra.apps import plugins
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from . import methods
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class ServiceBackend(plugins.Plugin):
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"""
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Service management backend base class
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It uses the _unit of work_ design principle, which allows bulk operations to
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be conviniently supported. Each backend generates the configuration for all
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the changes of all modified objects, reloading the daemon just once.
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"""
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model = None
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related_models = () # ((model, accessor__attribute),)
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script_method = methods.BashSSH
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function_method = methods.Python
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type = 'task' # 'sync'
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ignore_fields = []
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actions = []
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# TODO type: 'script', execution:'task'
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__metaclass__ = plugins.PluginMount
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def __unicode__(self):
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return type(self).__name__
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def __str__(self):
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return unicode(self)
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def __init__(self):
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self.cmds = []
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@classmethod
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def get_actions(cls):
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return [ action for action in cls.actions if action in dir(cls) ]
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@classmethod
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def get_name(cls):
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return cls.__name__
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@classmethod
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def is_main(cls, obj):
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opts = obj._meta
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return cls.model == '%s.%s' % (opts.app_label, opts.object_name)
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@classmethod
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def get_related(cls, obj):
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opts = obj._meta
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model = '%s.%s' % (opts.app_label, opts.object_name)
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for rel_model, field in cls.related_models:
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if rel_model == model:
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related = obj
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for attribute in field.split('__'):
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related = getattr(related, attribute)
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return related
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return None
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@classmethod
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def get_backends(cls, instance=None, action=None):
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backends = cls.get_plugins()
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included = []
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# Filter for instance or action
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if instance or action:
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for backend in backends:
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include = True
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if instance:
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opts = instance._meta
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if backend.model != '.'.join((opts.app_label, opts.object_name)):
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include = False
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if include and action:
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if action not in backend.get_actions():
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include = False
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if include:
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included.append(backend)
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backends = included
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return backends
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@classmethod
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def get_backend(cls, name):
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return cls.get_plugin(name)
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@classmethod
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def model_class(cls):
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return get_model(cls.model)
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def get_banner(self):
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time = timezone.now().strftime("%h %d, %Y %I:%M:%S")
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return "Generated by Orchestra at %s" % time
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def execute(self, server):
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from .models import BackendLog
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state = BackendLog.STARTED if self.cmds else BackendLog.SUCCESS
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log = BackendLog.objects.create(backend=self.get_name(), state=state, server=server)
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for method, cmds in self.cmds:
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method(log, server, cmds)
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if log.state != BackendLog.SUCCESS:
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break
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return log
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def append(self, *cmd):
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# aggregate commands acording to its execution method
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if isinstance(cmd[0], basestring):
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method = self.script_method
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cmd = cmd[0]
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else:
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method = self.function_method
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cmd = partial(*cmd)
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if not self.cmds or self.cmds[-1][0] != method:
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self.cmds.append((method, [cmd]))
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else:
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self.cmds[-1][1].append(cmd)
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def prepare(self):
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""" hook for executing something at the beging """
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pass
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def commit(self):
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"""
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apply the configuration, usually reloading a service
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reloading a service is done in a separated method in order to reload
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the service once in bulk operations
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"""
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pass
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class ServiceController(ServiceBackend):
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actions = ('save', 'delete')
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abstract = True
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@classmethod
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def get_verbose_name(cls):
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return _("[S] %s") % super(ServiceController, cls).get_verbose_name()
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@classmethod
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def get_backends(cls):
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""" filter controller classes """
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backends = super(ServiceController, cls).get_backends()
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return [
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backend for backend in backends if ServiceController in backend.__mro__
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]
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