143 lines
4.3 KiB
Python
143 lines
4.3 KiB
Python
from django.core.exceptions import ValidationError
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class Plugin(object):
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verbose_name = None
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# Used on select plugin view
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class_verbose_name = None
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icon = None
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change_form = None
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form = None
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serializer = None
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change_readonly_fields = ()
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plugin_field = None
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def __init__(self, instance=None):
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# Related model instance of this plugin
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self.instance = instance
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if self.form is None:
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from .forms import PluginForm
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self.form = PluginForm
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super().__init__()
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@classmethod
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def get_name(cls):
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return getattr(cls, 'name', cls.__name__)
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@classmethod
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def get_plugins(cls):
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return cls.plugins
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@classmethod
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def get(cls, name):
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if not hasattr(cls, '_registry'):
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cls._registry = {
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plugin.get_name(): plugin for plugin in cls.get_plugins()
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}
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return cls._registry[name]
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@classmethod
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def get_verbose_name(cls):
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# don't evaluate p.verbose_name gettext_lazy
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verbose = getattr(cls.verbose_name, '_proxy____args', [cls.verbose_name])
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if verbose[0]:
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return cls.verbose_name
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else:
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return cls.get_name()
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@classmethod
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def get_choices(cls):
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choices = []
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for plugin in cls.get_plugins():
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verbose = plugin.get_verbose_name()
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choices.append(
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(plugin.get_name(), verbose)
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)
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return sorted(choices, key=lambda e: e[1])
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@classmethod
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def get_change_readonly_fields(cls):
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return cls.change_readonly_fields
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@classmethod
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def get_class_path(cls):
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return '.'.join((cls.__module__, cls.__name__))
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def clean_data(self):
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""" model clean, uses cls.serizlier by default """
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if self.serializer:
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serializer = self.serializer(data=self.instance.data)
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if not serializer.is_valid():
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raise ValidationError(serializer.errors)
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return serializer.data
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return {}
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def get_directive(self):
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raise NotImplementedError
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def get_form(self):
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self.form.plugin = self
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self.form.plugin_field = self.plugin_field
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return self.form
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def get_change_form(self):
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form = self.change_form or self.form
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form.plugin = self
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form.plugin_field = self.plugin_field
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return form
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def get_serializer(self):
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self.serializer.plugin = self
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return self.serializer
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class PluginModelAdapter(Plugin):
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""" Adapter class for using model classes as plugins """
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model = None
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name_field = None
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form = None
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def __init__(self, instance=None):
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if self.form is None:
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from .forms import PluginModelAdapterForm
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self.form = PluginModelAdapterForm
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super().__init__(instance)
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@classmethod
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def get_plugins(cls):
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plugins = []
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for related_instance in cls.model.objects.filter(is_active=True):
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attributes = {
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'related_instance': related_instance,
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'verbose_name': related_instance.verbose_name
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}
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plugins.append(type('PluginAdapter', (cls,), attributes))
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return plugins
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@classmethod
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def get(cls, name):
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# don't cache, since models can change
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for plugin in cls.get_plugins():
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if name == plugin.get_name():
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return plugin
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@classmethod
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def get_name(cls):
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return getattr(cls.related_instance, cls.name_field)
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class PluginMount(type):
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def __init__(cls, name, bases, attrs):
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if not attrs.get('abstract', False):
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if not hasattr(cls, 'plugins'):
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# This branch only executes when processing the mount point itself.
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# So, since this is a new plugin type, not an implementation, this
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# class shouldn't be registered as a plugin. Instead, it sets up a
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# list where plugins can be registered later.
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cls.plugins = []
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else:
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# This must be a plugin implementation, which should be registered.
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# Simply appending it to the list is all that's needed to keep
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# track of it later.
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cls.plugins.append(cls)
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