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"""Module to handle the storehouse.""" |
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import threading |
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from kytos.core import log |
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from kytos.core.events import KytosEvent |
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class StoreHouse: |
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"""Class to handle storehouse.""" |
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@classmethod |
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def __new__(cls, *args, **kwargs): |
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# pylint: disable=unused-argument |
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"""Make this class a Singleton.""" |
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instance = cls.__dict__.get("__instance__") |
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if instance is not None: |
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return instance |
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cls.__instance__ = instance = object.__new__(cls) |
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return instance |
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def __init__(self, controller): |
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"""Create a storehouse instance.""" |
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self.controller = controller |
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self.namespace = 'kytos.mef_eline.circuits' |
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self._lock = threading.Lock() |
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if 'box' not in self.__dict__: |
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self.box = None |
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self.list_stored_boxes() |
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def get_data(self): |
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"""Return the box data.""" |
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if not self.box: |
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return {} |
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self.get_stored_box(self.box.box_id) |
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return self.box.data |
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def create_box(self): |
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"""Create a new box.""" |
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content = {'namespace': self.namespace, |
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'callback': self._create_box_callback, |
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'data': {}} |
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event = KytosEvent(name='kytos.storehouse.create', content=content) |
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self.controller.buffers.app.put(event) |
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log.info('Create box from storehouse.') |
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def _create_box_callback(self, _event, data, error): |
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"""Execute the callback to handle create_box.""" |
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if error: |
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log.error(f'Can\'t create box with namespace {self.namespace}') |
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self.box = data |
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log.info(f'Box {self.box.box_id} was created in {self.namespace}.') |
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def list_stored_boxes(self): |
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"""List all boxes using the current namespace.""" |
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name = 'kytos.storehouse.list' |
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content = {'namespace': self.namespace, |
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'callback': self._get_or_create_a_box_from_list_of_boxes} |
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event = KytosEvent(name=name, content=content) |
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self.controller.buffers.app.put(event) |
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log.debug(f'Bootstraping storehouse box for {self.namespace}.') |
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def _get_or_create_a_box_from_list_of_boxes(self, _event, data, _error): |
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"""Create a new box or retrieve the stored box.""" |
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if data: |
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self.get_stored_box(data[0]) |
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else: |
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self.create_box() |
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def get_stored_box(self, box_id): |
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"""Get box from storehouse.""" |
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content = {'namespace': self.namespace, |
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'callback': self._get_box_callback, |
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'box_id': box_id, |
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'data': {}} |
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name = 'kytos.storehouse.retrieve' |
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event = KytosEvent(name=name, content=content) |
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self.controller.buffers.app.put(event) |
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log.debug(f'Retrieve box with {box_id} from {self.namespace}.') |
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def _get_box_callback(self, _event, data, error): |
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"""Handle get_box method saving the box or logging with the error.""" |
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if error: |
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log.error(f'Box {data.box_id} not found in {self.namespace}.') |
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self.box = data |
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log.debug(f'Box {self.box.box_id} was loaded from storehouse.') |
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def save_evc(self, evc): |
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"""Save a EVC using the storehouse.""" |
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self._lock.acquire() # Lock to avoid race condition |
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log.debug(f'Lock {self._lock} acquired.') |
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self.box.data[evc.id] = evc.as_dict() |
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content = {'namespace': self.namespace, |
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'box_id': self.box.box_id, |
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'data': self.box.data, |
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'callback': self._save_evc_callback} |
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event = KytosEvent(name='kytos.storehouse.update', content=content) |
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self.controller.buffers.app.put(event) |
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def _save_evc_callback(self, _event, data, error): |
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"""Display the save EVC result in the log.""" |
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self._lock.release() |
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log.debug(f'Lock {self._lock} released.') |
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if error: |
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log.error(f'Can\'t update the {self.box.box_id}') |
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log.info(f'Box {data.box_id} was updated.') |
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kytos /
mef_eline
