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maziggy
0198226db1
surfaced it as "Failed to get image", which Bambuddy reported back as a 400. Fix: the snapshot endpoint already accepts a reusable camera-stream token (the same mechanism used by <img>-based camera consumers, since browsers can't send auth headers on image loads). The detection service now appends that token to the URL it gives the ML API. The token is cached on the service, refreshed 5 min before its 60-min expiry, and is simply ignored when Bambuddy auth is disabled — so no behavior change for users without auth. Refs #172
277 lines
11 KiB
Python
277 lines
11 KiB
Python
"""Obico AI print-failure detection service.
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Polls a self-hosted Obico ML API with snapshots from each monitored printer
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while a print is running, smooths scores over time, and dispatches a configured
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action (notify / pause / pause_and_off) when a sustained failure is detected.
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See `obico_smoothing.py` for the per-print EWM + rolling-mean math.
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"""
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import asyncio
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import json
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import logging
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from collections import deque
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from datetime import datetime, timedelta, timezone
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from urllib.parse import urlencode
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import httpx
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from sqlalchemy import select
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from backend.app.core.auth import (
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CAMERA_STREAM_TOKEN_EXPIRE_MINUTES,
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create_camera_stream_token,
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)
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from backend.app.core.database import async_session
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from backend.app.models.settings import Settings
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from backend.app.services.obico_smoothing import (
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PrintState,
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classify,
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score_from_detections,
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thresholds,
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)
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logger = logging.getLogger(__name__)
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HISTORY_MAX = 50
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HEALTH_TIMEOUT = 5.0
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DETECTION_TIMEOUT = 30.0
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class ObicoDetectionService:
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"""Singleton service that polls the ML API and acts on sustained failures."""
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def __init__(self):
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self._task: asyncio.Task | None = None
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# printer_id -> PrintState (reset when a new print starts)
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self._states: dict[int, PrintState] = {}
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# printer_id -> task_name active when state was created (used to detect new prints)
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self._state_keys: dict[int, str] = {}
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# printer_id -> last classification ("safe"/"warning"/"failure")
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self._last_class: dict[int, str] = {}
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# printer_id -> whether an action has already been fired for the current print
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self._action_fired: dict[int, bool] = {}
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# Global detection event log (most-recent-first)
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self._history: deque = deque(maxlen=HISTORY_MAX)
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self._last_error: str | None = None
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# Cached camera-stream token so the ML API can fetch snapshots when
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# auth is enabled. Refreshed before expiry; harmless when auth is off.
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self._snapshot_token: str | None = None
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self._snapshot_token_expires_at: datetime | None = None
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# ---- lifecycle ----
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async def start(self):
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if self._task is not None:
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return
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logger.info("Starting Obico detection service")
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self._task = asyncio.create_task(self._loop())
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def stop(self):
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if self._task:
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self._task.cancel()
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self._task = None
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logger.info("Stopped Obico detection service")
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# ---- snapshot auth ----
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async def _get_snapshot_token(self) -> str:
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"""Return a valid camera-stream token, refreshing it before expiry.
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The ML API fetches the snapshot URL directly, so when Bambuddy's auth
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is enabled the URL must carry a token (same scheme used by <img>-based
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camera consumers). When auth is disabled the token is simply ignored.
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"""
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now = datetime.now(timezone.utc)
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refresh_before = timedelta(minutes=5)
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if (
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self._snapshot_token is None
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or self._snapshot_token_expires_at is None
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or self._snapshot_token_expires_at - now <= refresh_before
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):
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self._snapshot_token = await create_camera_stream_token()
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self._snapshot_token_expires_at = now + timedelta(minutes=CAMERA_STREAM_TOKEN_EXPIRE_MINUTES)
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return self._snapshot_token
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# ---- settings ----
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async def _load_settings(self) -> dict:
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keys = [
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"obico_enabled",
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"obico_ml_url",
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"obico_sensitivity",
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"obico_action",
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"obico_poll_interval",
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"obico_enabled_printers",
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"external_url",
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]
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async with async_session() as db:
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result = await db.execute(select(Settings).where(Settings.key.in_(keys)))
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rows = {r.key: r.value for r in result.scalars().all()}
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enabled_printers_raw = rows.get("obico_enabled_printers", "")
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if enabled_printers_raw:
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try:
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enabled_printers = set(json.loads(enabled_printers_raw))
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except json.JSONDecodeError:
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enabled_printers = set()
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else:
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enabled_printers = None # None = all printers
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return {
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"enabled": rows.get("obico_enabled", "false").lower() == "true",
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"ml_url": (rows.get("obico_ml_url") or "").rstrip("/"),
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"sensitivity": rows.get("obico_sensitivity", "medium"),
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"action": rows.get("obico_action", "notify"),
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"poll_interval": int(rows.get("obico_poll_interval", "10")),
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"enabled_printers": enabled_printers,
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"external_url": (rows.get("external_url") or "").rstrip("/"),
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}
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# ---- main loop ----
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async def _loop(self):
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"""Poll active printers while enabled. Adjusts interval from settings each cycle."""
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while True:
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try:
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settings = await self._load_settings()
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interval = max(5, settings.get("poll_interval", 10))
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if not settings["enabled"] or not settings["ml_url"]:
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await asyncio.sleep(interval)
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continue
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if not settings["external_url"]:
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# Without a reachable base URL, the ML API can't fetch snapshots.
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self._last_error = "external_url not set — ML API cannot reach snapshot endpoint"
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await asyncio.sleep(interval)
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continue
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await self._poll_once(settings)
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await asyncio.sleep(interval)
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except asyncio.CancelledError:
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break
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except Exception as e:
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logger.error("Obico detection loop error: %s", e)
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self._last_error = str(e)
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await asyncio.sleep(30)
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async def _poll_once(self, settings: dict):
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# Late import to avoid cycles at module load time
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from backend.app.services.printer_manager import printer_manager
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statuses = printer_manager.get_all_statuses()
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for printer_id, status in list(statuses.items()):
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if settings["enabled_printers"] is not None and printer_id not in settings["enabled_printers"]:
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continue
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if not printer_manager.is_connected(printer_id):
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continue
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if not status or getattr(status, "state", None) != "RUNNING":
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# Reset state when not printing so the next print starts fresh
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self._states.pop(printer_id, None)
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self._state_keys.pop(printer_id, None)
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self._action_fired.pop(printer_id, None)
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continue
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await self._check_printer(printer_id, status, settings)
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async def _check_printer(self, printer_id: int, status, settings: dict):
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task_name = getattr(status, "task_name", None) or getattr(status, "subtask_name", "") or ""
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key = f"{task_name}"
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if self._state_keys.get(printer_id) != key:
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self._states[printer_id] = PrintState()
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self._state_keys[printer_id] = key
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self._action_fired[printer_id] = False
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token = await self._get_snapshot_token()
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snapshot_url = (
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f"{settings['external_url']}/api/v1/printers/{printer_id}/camera/snapshot?{urlencode({'token': token})}"
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)
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ml_url = f"{settings['ml_url']}/p/"
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try:
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async with httpx.AsyncClient(timeout=DETECTION_TIMEOUT) as client:
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resp = await client.get(ml_url, params={"img": snapshot_url})
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resp.raise_for_status()
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payload = resp.json()
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except Exception as e:
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self._last_error = f"ML API call failed for printer {printer_id}: {e}"
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logger.warning(self._last_error)
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return
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detections = payload.get("detections", []) if isinstance(payload, dict) else []
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current_p = score_from_detections(detections)
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state = self._states[printer_id]
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score = state.update(current_p)
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verdict = classify(score, settings["sensitivity"])
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self._last_class[printer_id] = verdict
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# Log every non-safe sample — safe samples would flood history
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if verdict != "safe" or detections:
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self._history.appendleft(
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{
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"printer_id": printer_id,
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"task_name": task_name,
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"timestamp": datetime.now(timezone.utc).isoformat(),
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"current_p": round(current_p, 4),
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"score": round(score, 4),
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"class": verdict,
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"detections": len(detections),
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}
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)
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if verdict == "failure" and not self._action_fired.get(printer_id):
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self._action_fired[printer_id] = True
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await self._dispatch_action(printer_id, settings["action"], task_name, score)
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async def _dispatch_action(self, printer_id: int, action: str, task_name: str, score: float):
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from backend.app.services.obico_actions import execute_action
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logger.warning(
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"Obico: failure detected on printer %s (task=%r score=%.3f) — action=%s",
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printer_id,
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task_name,
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score,
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action,
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)
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try:
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await execute_action(printer_id, action, task_name, score)
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except Exception as e:
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self._last_error = f"Action dispatch failed: {e}"
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logger.error(self._last_error)
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# ---- queries ----
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def get_status(self) -> dict:
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low, high = thresholds("medium")
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return {
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"is_running": self._task is not None and not self._task.done(),
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"last_error": self._last_error,
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"per_printer": {
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pid: {
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"class": self._last_class.get(pid, "safe"),
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"frame_count": state.frame_count,
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"score": round(state.ewm_mean, 4),
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}
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for pid, state in self._states.items()
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},
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"thresholds": {"low": low, "high": high},
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"history": list(self._history),
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}
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async def test_connection(self, url: str) -> dict:
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"""Ping the ML API health endpoint. Returns {ok, status_code, body, error}."""
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target = f"{url.rstrip('/')}/hc/"
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try:
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async with httpx.AsyncClient(timeout=HEALTH_TIMEOUT) as client:
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resp = await client.get(target)
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body = resp.text.strip()
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return {
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"ok": resp.status_code == 200 and body.lower() == "ok",
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"status_code": resp.status_code,
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"body": body,
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"error": None,
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}
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except Exception as e:
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return {"ok": False, "status_code": None, "body": None, "error": str(e)}
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obico_detection_service = ObicoDetectionService()
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