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"""Classes related to paths""" |
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import requests |
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from kytos.core import log |
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from kytos.core.common import EntityStatus, GenericEntity |
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from kytos.core.link import Link |
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from napps.kytos.mef_eline import settings |
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from napps.kytos.mef_eline.exceptions import InvalidPath |
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class Path(list, GenericEntity): |
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"""Class to represent a Path.""" |
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def __eq__(self, other=None): |
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"""Compare paths.""" |
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if not other or not isinstance(other, Path): |
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return False |
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return super().__eq__(other) |
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def is_affected_by_link(self, link=None): |
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"""Verify if the current path is affected by link.""" |
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if not link: |
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return False |
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return link in self |
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def link_affected_by_interface(self, interface=None): |
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"""Return the link using this interface, if any, or None otherwise.""" |
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if not interface: |
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return None |
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for link in self: |
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if interface in (link.endpoint_a, link.endpoint_b): |
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return link |
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return None |
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def choose_vlans(self): |
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"""Choose the VLANs to be used for the circuit.""" |
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for link in self: |
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tag = link.get_next_available_tag() |
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link.add_metadata('s_vlan', tag) |
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def make_vlans_available(self): |
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"""Make the VLANs used in a path available when undeployed.""" |
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for link in self: |
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link.make_tag_available(link.get_metadata('s_vlan')) |
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link.remove_metadata('s_vlan') |
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def is_valid(self, switch_a, switch_z, is_scheduled=False): |
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"""Check if this is a valid path.""" |
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previous = switch_a |
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for link in self: |
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if link.endpoint_a.switch != previous: |
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raise InvalidPath(f'{link.endpoint_a} switch is different' |
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f' from previous.') |
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if is_scheduled is False and ( |
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link.endpoint_a.link is None or |
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link.endpoint_a.link != link or |
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link.endpoint_b.link is None or |
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link.endpoint_b.link != link |
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): |
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raise InvalidPath(f'Link {link} is not available.') |
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previous = link.endpoint_b.switch |
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if previous == switch_z: |
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return True |
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raise InvalidPath(f'Last endpoint is different from uni_z') |
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@property |
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def status(self): |
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"""Check for the status of a path. |
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If any link in this path is down, the path is considered down. |
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""" |
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if not self: |
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return EntityStatus.DISABLED |
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endpoint = '%s/%s' % (settings.TOPOLOGY_URL, 'links') |
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api_reply = requests.get(endpoint) |
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if api_reply.status_code != getattr(requests.codes, 'ok'): |
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log.error('Failed to get links at %s. Returned %s', |
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endpoint, api_reply.status_code) |
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return None |
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links = api_reply.json()['links'] |
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return_status = EntityStatus.UP |
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for path_link in self: |
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try: |
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link = links[path_link.id] |
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except KeyError: |
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return EntityStatus.DISABLED |
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if link['enabled'] is False: |
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return EntityStatus.DISABLED |
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if link['active'] is False: |
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return_status = EntityStatus.DOWN |
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return return_status |
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def as_dict(self): |
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"""Return list comprehension of links as_dict.""" |
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return [link.as_dict() for link in self if link] |
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class DynamicPathManager: |
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"""Class to handle and create paths.""" |
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controller = None |
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@classmethod |
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def set_controller(cls, controller=None): |
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"""Set the controller to discovery news paths.""" |
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cls.controller = controller |
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@staticmethod |
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def get_paths(circuit): |
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"""Get a valid path for the circuit from the Pathfinder.""" |
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endpoint = settings.PATHFINDER_URL |
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request_data = {"source": circuit.uni_a.interface.id, |
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"destination": circuit.uni_z.interface.id} |
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api_reply = requests.post(endpoint, json=request_data) |
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if api_reply.status_code != getattr(requests.codes, 'ok'): |
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log.error("Failed to get paths at %s. Returned %s", |
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endpoint, api_reply.status_code) |
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return None |
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reply_data = api_reply.json() |
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return reply_data.get('paths') |
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@staticmethod |
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def _clear_path(path): |
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"""Remove switches from a path, returning only interfaces.""" |
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return [endpoint for endpoint in path if len(endpoint) > 23] |
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@classmethod |
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def get_best_path(cls, circuit): |
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"""Return the best path available for a circuit, if exists.""" |
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paths = cls.get_paths(circuit) |
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if paths: |
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return cls.create_path(cls.get_paths(circuit)[0]['hops']) |
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return None |
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@classmethod |
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def get_best_paths(cls, circuit): |
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"""Return the best paths available for a circuit, if they exist.""" |
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for path in cls.get_paths(circuit): |
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yield cls.create_path(path['hops']) |
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@classmethod |
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def create_path(cls, path): |
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"""Return the path containing only the interfaces.""" |
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new_path = Path() |
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clean_path = cls._clear_path(path) |
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if len(clean_path) % 2: |
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return None |
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for link in zip(clean_path[1:-1:2], clean_path[2::2]): |
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interface_a = cls.controller.get_interface_by_id(link[0]) |
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interface_b = cls.controller.get_interface_by_id(link[1]) |
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if interface_a is None or interface_b is None: |
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return None |
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new_path.append(Link(interface_a, interface_b)) |
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return new_path |
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ajoaoff /
mef_eline
