134 lines
4.4 KiB
Python
134 lines
4.4 KiB
Python
"""Outpost websocket handler"""
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from dataclasses import asdict, dataclass, field
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from datetime import datetime
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from enum import IntEnum
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from typing import Any, Optional
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from channels.exceptions import DenyConnection
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from dacite import from_dict
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from dacite.data import Data
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from guardian.shortcuts import get_objects_for_user
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from prometheus_client import Gauge
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from structlog.stdlib import get_logger
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from authentik.core.channels import AuthJsonConsumer
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from authentik.outposts.models import OUTPOST_HELLO_INTERVAL, Outpost, OutpostState
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GAUGE_OUTPOSTS_CONNECTED = Gauge(
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"authentik_outposts_connected", "Currently connected outposts", ["outpost", "uid", "expected"]
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)
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GAUGE_OUTPOSTS_LAST_UPDATE = Gauge(
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"authentik_outposts_last_update",
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"Last update from any outpost",
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["outpost", "uid", "version"],
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)
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LOGGER = get_logger()
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class WebsocketMessageInstruction(IntEnum):
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"""Commands which can be triggered over Websocket"""
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# Simple message used by either side when a message is acknowledged
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ACK = 0
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# Message used by outposts to report their alive status
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HELLO = 1
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# Message sent by us to trigger an Update
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TRIGGER_UPDATE = 2
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@dataclass
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class WebsocketMessage:
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"""Complete Websocket Message that is being sent"""
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instruction: int
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args: dict[str, Any] = field(default_factory=dict)
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class OutpostConsumer(AuthJsonConsumer):
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"""Handler for Outposts that connect over websockets for health checks and live updates"""
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outpost: Optional[Outpost] = None
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last_uid: Optional[str] = None
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first_msg = False
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def connect(self):
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super().connect()
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uuid = self.scope["url_route"]["kwargs"]["pk"]
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outpost = get_objects_for_user(self.user, "authentik_outposts.view_outpost").filter(pk=uuid)
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if not outpost.exists():
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raise DenyConnection()
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self.accept()
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self.outpost = outpost.first()
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self.last_uid = self.channel_name
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# pylint: disable=unused-argument
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def disconnect(self, code):
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if self.outpost and self.last_uid:
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state = OutpostState.for_instance_uid(self.outpost, self.last_uid)
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if self.channel_name in state.channel_ids:
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state.channel_ids.remove(self.channel_name)
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state.save()
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GAUGE_OUTPOSTS_CONNECTED.labels(
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outpost=self.outpost.name,
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uid=self.last_uid,
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expected=self.outpost.config.kubernetes_replicas,
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).dec()
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LOGGER.debug(
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"removed outpost instance from cache",
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outpost=self.outpost,
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instance_uuid=self.last_uid,
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)
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def receive_json(self, content: Data):
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msg = from_dict(WebsocketMessage, content)
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uid = msg.args.get("uuid", self.channel_name)
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self.last_uid = uid
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if not self.outpost:
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raise DenyConnection()
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state = OutpostState.for_instance_uid(self.outpost, uid)
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if self.channel_name not in state.channel_ids:
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state.channel_ids.append(self.channel_name)
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state.last_seen = datetime.now()
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if not self.first_msg:
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GAUGE_OUTPOSTS_CONNECTED.labels(
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outpost=self.outpost.name,
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uid=self.last_uid,
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expected=self.outpost.config.kubernetes_replicas,
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).inc()
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LOGGER.debug(
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"added outpost instance to cache",
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outpost=self.outpost,
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instance_uuid=self.last_uid,
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)
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self.first_msg = True
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if msg.instruction == WebsocketMessageInstruction.HELLO:
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state.version = msg.args.get("version", None)
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state.build_hash = msg.args.get("buildHash", "")
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elif msg.instruction == WebsocketMessageInstruction.ACK:
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return
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GAUGE_OUTPOSTS_LAST_UPDATE.labels(
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outpost=self.outpost.name,
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uid=self.last_uid or "",
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version=state.version or "",
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).set_to_current_time()
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state.save(timeout=OUTPOST_HELLO_INTERVAL * 1.5)
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response = WebsocketMessage(instruction=WebsocketMessageInstruction.ACK)
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self.send_json(asdict(response))
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# pylint: disable=unused-argument
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def event_update(self, event):
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"""Event handler which is called by post_save signals, Send update instruction"""
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self.send_json(
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asdict(WebsocketMessage(instruction=WebsocketMessageInstruction.TRIGGER_UPDATE))
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)
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