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"""Module to handle the storehouse.""" |
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import threading |
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import time |
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from kytos.core import log |
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from kytos.core.events import KytosEvent |
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from napps.kytos.topology import settings |
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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 client instance.""" |
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self.controller = controller |
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self.namespace = 'kytos.topology.status' |
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if '_lock' not in self.__dict__: |
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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.storehouse_done = False |
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self.storehouse_error = None |
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self.list_stored_boxes() |
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def get_data(self): |
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"""Return the persistence box data.""" |
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# Wait for box retrieve from storehouse |
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i = 0 |
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while not self.box and i < settings.STOREHOUSE_TIMEOUT: |
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time.sleep(settings.STOREHOUSE_WAIT_INTERVAL) |
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i += settings.STOREHOUSE_WAIT_INTERVAL |
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if not self.box: |
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error = 'Error retrieving persistence box from storehouse.' |
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raise FileNotFoundError(error) |
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return self.box.data |
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def create_box(self): |
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"""Create a persistence box to store administrative changes.""" |
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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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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 persistence' |
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f'box with namespace {self.namespace}') |
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self.box = data |
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def list_stored_boxes(self): |
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"""List all persistence box stored in storehouse.""" |
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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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def _get_or_create_a_box_from_list_of_boxes(self, _event, data, _error): |
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"""Create a persistence 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 persistence 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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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('Persistence box not found.') |
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self.box = data |
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def save_status(self, status): |
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"""Save the network administrative status using storehouse.""" |
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with self._lock: |
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self.storehouse_done = False |
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self.storehouse_error = None |
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self.box.data[status.get('id')] = status |
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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_status_callback} |
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event = KytosEvent(name='kytos.storehouse.update', |
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content=content) |
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self.controller.buffers.app.put(event) |
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i = 0 |
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while not self.storehouse_done and i < settings.STOREHOUSE_TIMEOUT: |
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time.sleep(settings.STOREHOUSE_WAIT_INTERVAL) |
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i += settings.STOREHOUSE_WAIT_INTERVAL |
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if not self.storehouse_done: |
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self.storehouse_error = 'Timeout while waiting for storehouse' |
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if self.storehouse_error: |
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log.error('Fail to update persistence box in ' |
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f'{self.namespace}.{self.box.box_id}. ' |
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f'Error: {self.storehouse_error}') |
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return |
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log.info('Network administrative status saved in ' |
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f'{self.namespace}.{self.box.box_id}') |
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def _save_status_callback(self, _event, _data, error): |
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"""Handle storehouse update result.""" |
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self.storehouse_done = True |
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self.storehouse_error = error |
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kytos-ng /
topology
