Backend: ricetta DXF compare da camera e calibrazione letta dall'acquisitore (#83)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/backend/services/vision_service.py

@@ -7,6 +7,7 @@ from __future__ import annotations
 
 import hashlib
 import json
+import logging
 import math
 from pathlib import Path
 from uuid import uuid4
@@ -24,6 +25,8 @@ from src.backend.models.orm.task import RecipeSubtask, RecipeTask
 from src.backend.models.orm.vision import VisionReferenceImage, VisionResult
 from src.backend.services import measurement_service
 
+logger = logging.getLogger(__name__)
+
 # Worker responses whose status and reason are forwarded as-is rather than
 # flattened into a generic 502 - see `_call_worker`.
 _FORWARDED_WORKER_STATUSES = frozenset({
@@ -140,6 +143,136 @@ async def _call_worker(
     return report
 
 
+async def call_worker_multipart(
+    path: str,
+    *,
+    files: dict,
+    data: dict,
+    worker_url: str | None = None,
+    timeout: float = 120.0,
+) -> dict:
+    """POST multipart generico al worker (#83): /recipes/dxf-compare.
+
+    Stessa traduzione degli errori di `_call_worker`: 504 sul timeout, 502 sul
+    trasporto o su una risposta non JSON-oggetto; 422/503/504 del worker si
+    inoltrano cosi' come sono. Worker della stazione o, se manca, il centrale.
+    """
+    base = (worker_url or settings.vision_worker_url).rstrip("/")
+    try:
+        async with httpx.AsyncClient(timeout=timeout) as client:
+            response = await client.post(f"{base}{path}", files=files, data=data)
+    except httpx.TimeoutException as exc:
+        raise HTTPException(
+            status_code=status.HTTP_504_GATEWAY_TIMEOUT,
+            detail=f"the vision worker did not answer in time: {exc} ({base})",
+        ) from exc
+    except (httpx.TransportError, httpx.HTTPError) as exc:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker is unreachable: {exc} ({base})",
+        ) from exc
+
+    if response.status_code in _FORWARDED_WORKER_STATUSES:
+        try:
+            detail = response.json().get("detail", response.text)
+        except ValueError:
+            detail = response.text
+        raise HTTPException(status_code=response.status_code, detail=detail)
+    if response.status_code != 200:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker refused the job: {response.text}",
+        )
+    try:
+        body = response.json()
+    except ValueError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail=f"the vision worker's answer was malformed: not valid JSON ({exc})",
+        ) from exc
+    if not isinstance(body, dict):
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail="the vision worker's answer was malformed: expected a JSON object",
+        )
+    return body
+
+
+async def dxf_compare_recipe(
+    image_bytes: bytes, dxf_bytes: bytes, *, px_per_mm: float, band_mm: float,
+    min_points_pct: float, polarity: str, worker_url: str | None = None,
+) -> dict:
+    """W2: ricetta dxf-compare da immagine + DXF (#83). Sostituita dai test."""
+    body = await call_worker_multipart(
+        "/recipes/dxf-compare",
+        files={
+            "image": ("frame.png", image_bytes, "image/png"),
+            "dxf": ("disegno.dxf", dxf_bytes, "application/octet-stream"),
+        },
+        data={
+            "px_per_mm": str(px_per_mm), "band_mm": str(band_mm),
+            "min_points_pct": str(min_points_pct), "polarity": polarity,
+        },
+        worker_url=worker_url,
+    )
+    # forma minima del contratto W2: senza graph e files non c'e' nulla da salvare
+    if not isinstance(body.get("graph"), dict) or not isinstance(body.get("files"), dict):
+        raise HTTPException(
+            status_code=status.HTTP_502_BAD_GATEWAY,
+            detail="the vision worker's answer was malformed: missing graph or files",
+        )
+    return body
+
+
+# Stati di fetch_station_calibration (#83)
+CAL_OK = "ok"
+CAL_NO_CAMERA = "no_camera"            # la stazione non ha camera_url/camera_source
+CAL_NOT_CALIBRATED = "not_calibrated"  # l'acquisitore risponde 404 (o un valore inutilizzabile)
+CAL_UNREACHABLE = "unreachable"        # l'acquisitore non risponde
+
+
+async def fetch_station_calibration(station: Station | None) -> tuple[dict | None, str]:
+    """Legge la calibrazione dall'acquisitore della stazione (C1, #83).
+
+    GET {camera_url}/camera/calibration?source={camera_source}. La calibrazione
+    vive nell'acquisitore: TMF la legge, non la tiene. Ritorna (dict, "ok")
+    oppure (None, motivo) per distinguere «non calibrata» da «irraggiungibile».
+    Un px_per_mm non finito o <= 0 conta come non calibrata.
+    """
+    if station is None or not station.camera_url or not station.camera_source:
+        return None, CAL_NO_CAMERA
+    url = f"{station.camera_url.rstrip('/')}/camera/calibration"
+    try:
+        # timeout breve: e' una lettura di servizio, non deve bloccare l'execute
+        async with httpx.AsyncClient(timeout=5.0) as client:
+            response = await client.get(url, params={"source": station.camera_source})
+    except httpx.HTTPError as exc:
+        logger.warning("acquisitore della stazione %s non raggiungibile: %s", station.code, exc)
+        return None, CAL_UNREACHABLE
+    if response.status_code == status.HTTP_404_NOT_FOUND:
+        return None, CAL_NOT_CALIBRATED
+    if response.status_code != 200:
+        logger.warning(
+            "acquisitore della stazione %s: HTTP %s", station.code, response.status_code,
+        )
+        return None, CAL_UNREACHABLE
+    try:
+        body = response.json()
+    except ValueError:
+        logger.warning("acquisitore della stazione %s: risposta non JSON", station.code)
+        return None, CAL_UNREACHABLE
+    px_per_mm = body.get("px_per_mm") if isinstance(body, dict) else None
+    if not (_is_measurable(px_per_mm) and px_per_mm > 0):
+        return None, CAL_NOT_CALIBRATED
+    return body, CAL_OK
+
+
+async def get_station_calibration(station: Station | None) -> dict | None:
+    """La calibrazione C1 della stazione, o None in ogni altro caso (#83)."""
+    calibration, _ = await fetch_station_calibration(station)
+    return calibration
+
+
 async def validate_recipe(graph: dict, recipe_dir: str | None) -> dict:
     """Ask the worker's /validate whether a v2 recipe is loadable (#46).
 
@@ -365,11 +498,14 @@ async def execute_task(
         )
     # Worker della stazione della sessione di produzione (#45); senza run o senza URL: centrale
     station_url = None
+    # Calibrazione letta dall'acquisitore della stazione (#83); None = non c'e'
+    calibration = None
     if run is not None:
         station = (await db.execute(
             select(Station).where(Station.id == run.station_id)
         )).scalar_one_or_none()
         station_url = (station.vision_worker_url or None) if station is not None else None
+        calibration = await get_station_calibration(station)
 
     if not task.vision_json:
         raise HTTPException(
@@ -419,11 +555,15 @@ async def execute_task(
             ),
         )
 
-    # Nessuna fonte di calibrazione esiste oggi (ne' task ne' stazione): non si
-    # passa `calibration`, la ricetta porta la sua (#46).
+    # La calibrazione viene dall'acquisitore della stazione (#83); se non c'e',
+    # non si passa `calibration` e la ricetta porta la sua (#46).
+    worker_kwargs: dict = {}
+    if calibration is not None:
+        worker_kwargs["calibration"] = {"px_per_mm": float(calibration["px_per_mm"])}
     report = await _call_worker(
         image_bytes, task.vision_json, recipe_dir=task.vision_recipe_dir,
         worker_url=station_url,  # #45
+        **worker_kwargs,
     )
     outputs = report["outputs"]
 
@@ -457,6 +597,8 @@ async def execute_task(
         station_id=run.station_id if run is not None else None,
         worker_url=(station_url or settings.vision_worker_url).rstrip("/"),
         graph_snapshot=task.vision_json,
+        # copiata come il grafo (#83): ricalibrare dopo non cambia cio' che e' stato misurato
+        calibration_snapshot=calibration,
         duration_ms=report.get("duration_ms"),
     )
     db.add(result)
@@ -601,3 +743,42 @@ async def preview(db: AsyncSession, task: RecipeTask, image_bytes: bytes) -> dic
     return await _call_worker(
         image_bytes, task.vision_json, recipe_dir=task.vision_recipe_dir,
     )
+
+
+async def ensure_points_quote(
+    db: AsyncSession, task: RecipeTask, min_points_pct: float,
+) -> bool:
+    """Crea la quota «Punti in tolleranza» se il task non ha nessuna quota di visione (#83).
+
+    Una sola volta: se esiste gia' una quota con `vision_output`, non si tocca.
+    Se la versione ha gia' misure non si scrive (il copy-on-write sta nel router
+    dei task, qui non si aggira): ritorna False. Ritorna True se l'ha creata.
+    """
+    from src.backend.services import recipe_service  # import locale: evita cicli
+
+    existing = (await db.execute(
+        select(RecipeSubtask.id)
+        .where(RecipeSubtask.task_id == task.id)
+        .where(RecipeSubtask.vision_output.is_not(None))
+        .limit(1)
+    )).scalar_one_or_none()
+    if existing is not None:
+        return False
+    if await recipe_service.version_has_measurements(db, task.version_id):
+        return False
+    markers = (await db.execute(
+        select(RecipeSubtask.marker_number).where(RecipeSubtask.task_id == task.id)
+    )).scalars().all()
+    db.add(RecipeSubtask(
+        task_id=task.id,
+        marker_number=max(markers, default=0) + 1,  # unico per task (uq_task_marker)
+        description="Punti in tolleranza",
+        nominal=100,
+        # limiti assoluti come nel resto delle quote: passa se punti% >= min_points_pct
+        ltl=min_points_pct,
+        utl=100,
+        unit="%",
+        vision_output="dxf.points_in_pct",
+    ))
+    await db.flush()
+    return True