fix: timing flash + couleur idle LED + diagnostic auto-brightness

backend/services/config_service.py

@@ -228,6 +228,24 @@ class ConfigService:
             self._config.print.user_print_quota = quota
             self._config.print.user_print_max_copies = max_copies
 
+    def save_printer_excluded(self, printer_name: str, excluded: bool):
+        """Marque (ou démarque) une imprimante comme exclue du load-balancing."""
+        with open(self.path, encoding="utf-8") as f:
+            raw = yaml.safe_load(f) or {}
+        printers = raw.get("print", {}).get("printers", [])
+        for p in printers:
+            if isinstance(p, dict) and p.get("name") == printer_name:
+                p["excluded"] = excluded
+                break
+        raw.setdefault("print", {})["printers"] = printers
+        with open(self.path, "w", encoding="utf-8") as f:
+            yaml.dump(raw, f, allow_unicode=True, default_flow_style=False)
+        if self._config:
+            for p in self._config.print.printers:
+                if isinstance(p, dict) and p.get("name") == printer_name:
+                    p["excluded"] = excluded
+                    break
+
     def save_print_mode(self, mode: str):
         with open(self.path, encoding="utf-8") as f:
             raw = yaml.safe_load(f) or {}

backend/services/photobooth_service.py

@@ -191,26 +191,40 @@ class PhotoboothService:
         """Tente de recuperer une frame JPEG du liveview de photobooth-app.
 
         Essaie dans l'ordre :
-        1. /api/stream/snapshot — endpoint snapshot direct (si disponible)
-        2. /stream.mjpg — flux MJPEG classique, extrait la premiere frame
-        3. /api/stream — flux MJPEG alternatif
+        1. Endpoints snapshot direct (retour JPEG immédiat)
+        2. Flux MJPEG — extrait la premiere frame
 
         Retourne des bytes JPEG ou None si rien n'est disponible.
         """
-        # 1. Snapshot direct
-        for path in ("/api/stream/snapshot",):
+        # 1. Endpoints snapshot direct (differentes versions de photobooth-app)
+        snapshot_paths = (
+            "/api/stream/snapshot",
+            "/api/video/preview/snapshot",
+            "/api/livestream/snapshot",
+            "/api/cam/stream/snapshot",
+        )
+        for path in snapshot_paths:
             try:
                 async with httpx.AsyncClient(timeout=2.0) as client:
                     r = await client.get(f"{self._base}{path}")
                     if r.status_code == 200:
                         ct = r.headers.get("content-type", "")
                         if "jpeg" in ct or "image" in ct:
+                            logger.debug("Snapshot OK via %s", path)
                             return r.content
             except Exception as e:
                 logger.debug("Snapshot %s: %s", path, e)
 
-        # 2. Premiere frame d'un flux MJPEG
-        for path in ("/stream.mjpg", "/api/stream"):
+        # 2. Premiere frame d'un flux MJPEG (differentes versions)
+        mjpeg_paths = (
+            "/stream.mjpg",
+            "/api/stream",
+            "/api/video/stream",
+            "/api/video/preview",
+            "/api/livestream",
+            "/livestream",
+        )
+        for path in mjpeg_paths:
             try:
                 async with httpx.AsyncClient(timeout=3.0) as client:
                     async with client.stream("GET", f"{self._base}{path}") as resp:
@@ -223,12 +237,14 @@ class PhotoboothService:
                             if start >= 0:
                                 end = buf.find(b"\xff\xd9", start)
                                 if end >= 0:
+                                    logger.debug("MJPEG frame OK via %s", path)
                                     return buf[start:end + 2]
                             if len(buf) > 500_000:
                                 break
             except Exception as e:
                 logger.debug("MJPEG %s: %s", path, e)
 
+        logger.debug("Aucun endpoint liveview disponible sur %s", self._base)
         return None
 
     async def close(self):

backend/services/printer_service.py

@@ -244,7 +244,13 @@ class PrinterService:
         if not Path(filename).exists():
             return {"success": False, "error": f"Fichier introuvable: {filename}"}
 
-        cmd = ["/bin/bash", script, filename, "image", "default", str(copies)]
+        # Imprimantes exclues du load-balancing (flag excluded dans config)
+        excluded_list = ",".join(
+            self._printer_name(p)
+            for p in self._cfg.printers
+            if isinstance(p, dict) and p.get("excluded", False)
+        )
+        cmd = ["/bin/bash", script, filename, "image", "default", str(copies), excluded_list]
         try:
             proc = subprocess.run(
                 cmd, capture_output=True, text=True, timeout=120
@@ -361,11 +367,13 @@ class PrinterService:
         statuses = []
         for p in self._cfg.printers:
             name = self._printer_name(p)
+            excluded = isinstance(p, dict) and bool(p.get("excluded", False))
             status = await asyncio.to_thread(self._get_printer_status, name)
             stats = await self._get_printer_db_stats(name)
             statuses.append({
                 "name": name,
                 "label": self._printer_label(p),
+                "excluded": excluded,
                 **status,
                 **stats,
             })
@@ -619,8 +627,8 @@ class PrinterService:
     async def enable_printer(self, printer_name: str) -> bool:
         """Active l'imprimante CUPS (cupsenable) et accepte les nouveaux jobs."""
         try:
-            r1 = subprocess.run(["cupsenable", printer_name], capture_output=True, timeout=10)
-            r2 = subprocess.run(["cupsaccept", printer_name], capture_output=True, timeout=10)
+            r1 = subprocess.run(["sudo", "cupsenable", printer_name], capture_output=True, timeout=10)
+            r2 = subprocess.run(["sudo", "cupsaccept", printer_name], capture_output=True, timeout=10)
             return r1.returncode == 0 and r2.returncode == 0
         except Exception as e:
             logger.error("Erreur enable printer %s: %s", printer_name, e)
@@ -629,7 +637,7 @@ class PrinterService:
     async def disable_printer(self, printer_name: str) -> bool:
         """Désactive l'imprimante CUPS (cupsdisable)."""
         try:
-            result = subprocess.run(["cupsdisable", printer_name], capture_output=True, timeout=10)
+            result = subprocess.run(["sudo", "cupsdisable", printer_name], capture_output=True, timeout=10)
             return result.returncode == 0
         except Exception as e:
             logger.error("Erreur disable printer %s: %s", printer_name, e)
@@ -638,7 +646,7 @@ class PrinterService:
     async def reject_jobs(self, printer_name: str) -> bool:
         """Refuse les nouveaux jobs (cupsreject) sans stopper l'impression en cours."""
         try:
-            result = subprocess.run(["cupsreject", printer_name], capture_output=True, timeout=10)
+            result = subprocess.run(["sudo", "cupsreject", printer_name], capture_output=True, timeout=10)
             return result.returncode == 0
         except Exception as e:
             logger.error("Erreur reject printer %s: %s", printer_name, e)