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import sys
from leapp.exceptions import InvalidTopicDefinitionError
from leapp.utils.meta import get_flattened_subclasses, with_metaclass
class TopicMeta(type):
"""
Meta class for the registration of topics
"""
def __new__(mcs, name, bases, attrs):
klass = super(TopicMeta, mcs).__new__(mcs, name, bases, attrs)
setattr(sys.modules[mcs.__module__], name, klass)
setattr(klass, 'messages', ())
return klass
class Topic(with_metaclass(TopicMeta)):
""" Base class for all :ref:`topics <terminology:topic>`"""
name = None
""" Name of the topic in snake case """
messages = ()
"""
Tuple of :py:class:`leapp.models.Model` derived classes that are using this topic are automatically added to this
variable.
"""
@classmethod
def serialize(cls):
return {
'class_name': cls.__name__,
'name': cls.name,
'messages': [m.__name__ for m in cls.messages]
}
class DialogTopic(Topic):
"""
A special topic for dialogs shown to user during workflow execution.
"""
name = 'dialog_topic'
class ErrorTopic(Topic):
"""
A special topic for errors during the execution.
"""
name = 'errors'
class ReportTopic(Topic):
"""
A special topic for reporting purposes.
"""
name = 'report_topic'
def get_topics():
"""
:return: All registered :py:class:`leapp.topics.Topic` derived classes
"""
topics = get_flattened_subclasses(Topic)
for topic in (topic for topic in topics):
topic_name = getattr(topic, 'name', None)
if not topic_name:
raise InvalidTopicDefinitionError('Topic {} does not contain a name attribute'.format(topic))
return topics