Backend Monitorink: serveur PNG (Claude usage + météo + HA)

backend/app.py

@@ -0,0 +1,49 @@
+"""Serveur Monitorink : expose le dashboard en PNG pour la Kobo.
+
+Endpoints :
+  GET /image.png   -> dashboard 1264x1680 niveaux de gris (avec cache TTL)
+  GET /debug.html  -> HTML brut (itération design, pas de screenshot)
+  GET /health      -> sonde de vie
+"""
+from __future__ import annotations
+
+import time
+
+from fastapi import FastAPI, Response
+from fastapi.responses import HTMLResponse
+
+import render
+from config import config
+
+app = FastAPI(title="Monitorink", docs_url=None, redoc_url=None)
+
+_cache: dict[str, object] = {"png": None, "ts": 0.0}
+
+
+@app.get("/health")
+async def health() -> dict:
+    return {"status": "ok"}
+
+
+@app.get("/image.png")
+async def image(fresh: int = 0) -> Response:
+    now = time.time()
+    cached = _cache["png"]
+    age = now - float(_cache["ts"])
+    if cached and not fresh and age < config.cache_ttl_seconds:
+        png = cached  # type: ignore[assignment]
+    else:
+        png = await render.render_png()
+        _cache["png"] = png
+        _cache["ts"] = now
+    return Response(
+        content=png,  # type: ignore[arg-type]
+        media_type="image/png",
+        headers={"Cache-Control": "no-store"},
+    )
+
+
+@app.get("/debug.html", response_class=HTMLResponse)
+async def debug_html() -> str:
+    context = await render.build_context()
+    return render.render_html(context)