feat(recipe): send embedded recipe workflow to ComfyUI canvas

py/services/persistent_recipe_cache.py

@@ -58,6 +58,7 @@ class PersistentRecipeCache:
         "checkpoint_json",
         "gen_params_json",
         "tags_json",
+        "has_workflow",
     )
     _instances: Dict[str, "PersistentRecipeCache"] = {}
     _instance_lock = threading.Lock()
@@ -407,7 +408,8 @@ class PersistentRecipeCache:
                             loras_json TEXT,
                             checkpoint_json TEXT,
                             gen_params_json TEXT,
-                            tags_json TEXT
+                            tags_json TEXT,
+                            has_workflow INTEGER DEFAULT 0
                         );
 
                         CREATE INDEX IF NOT EXISTS idx_recipes_json_path ON recipes(json_path);
@@ -426,6 +428,13 @@ class PersistentRecipeCache:
                         )
                     except Exception:
                         pass  # column already exists
+                    # Migration: add has_workflow column to existing databases
+                    try:
+                        conn.execute(
+                            "ALTER TABLE recipes ADD COLUMN has_workflow INTEGER DEFAULT 0"
+                        )
+                    except Exception:
+                        pass  # column already exists
                     conn.commit()
                 self._schema_initialized = True
             except Exception as exc:
@@ -488,6 +497,7 @@ class PersistentRecipeCache:
             checkpoint_json,
             gen_params_json,
             tags_json,
+            1 if recipe.get("has_workflow") else 0,
         )
 
     def _row_to_recipe(self, row: sqlite3.Row) -> Dict[str, Any]:
@@ -533,6 +543,7 @@ class PersistentRecipeCache:
             "favorite": bool(row["favorite"]),
             "repair_version": row["repair_version"] or 0,
             "preview_nsfw_level": row["preview_nsfw_level"] or 0,
+            "has_workflow": bool(row["has_workflow"]),
             "loras": loras,
             "gen_params": gen_params,
         }

py/services/recipe_scanner.py

@@ -13,6 +13,7 @@ import time
 from typing import Any, Callable, Dict, Iterable, List, Optional, Set, Tuple, Union, cast
 from ..config import config
 from ..utils.constants import VALID_CHECKPOINT_SUB_TYPES, VALID_LORA_TYPES
+from ..utils.exif_utils import ExifUtils
 from ..utils.file_utils import calculate_autov3
 from ..utils.recipe_open_stats import RecipeOpenStats
 from .model_scanner import WEIGHT_FILE_EXTENSIONS
@@ -1729,6 +1730,23 @@ class RecipeScanner:
 
         return recipes, json_paths
 
+    @staticmethod
+    def _detect_has_workflow(image_path: Optional[str]) -> bool:
+        """Detect whether the recipe image embeds a ComfyUI workflow.
+
+        Reuses ``ExifUtils._load_structured_metadata`` so the metadata parsing
+        stays in one place. Any failure (missing/corrupt image, unsupported
+        format, unexpected exception) maps to ``False`` and never propagates —
+        recipe loading must remain resilient.
+        """
+        if not image_path or not os.path.exists(image_path):
+            return False
+        try:
+            metadata = ExifUtils._load_structured_metadata(image_path)
+            return bool(metadata.get("workflow"))
+        except Exception:
+            return False
+
     def _load_recipe_file_sync(self, recipe_path: str) -> Optional[Dict[str, Any]]:
         """Load a single recipe file synchronously.
 
@@ -1785,6 +1803,19 @@ class RecipeScanner:
                 except Exception as e:
                     logger.warning(f"Failed to persist repair for {recipe_path}: {e}")
 
+            # Detect embedded ComfyUI workflow and persist when it changed
+            if "has_workflow" not in recipe_data:
+                has_workflow = self._detect_has_workflow(recipe_data.get("file_path"))
+                if has_workflow != recipe_data.get("has_workflow"):
+                    recipe_data["has_workflow"] = has_workflow
+                    try:
+                        with open(recipe_path, "w", encoding="utf-8") as f:
+                            json.dump(recipe_data, f, indent=4, ensure_ascii=False)
+                    except Exception as e:
+                        logger.warning(
+                            f"Failed to persist has_workflow for {recipe_path}: {e}"
+                        )
+
             # Track folder placement relative to recipes directory
             recipe_data["folder"] = recipe_data.get("folder") or self._calculate_folder(
                 recipe_path
@@ -2470,6 +2501,13 @@ class RecipeScanner:
             if path_updated:
                 self._write_recipe_file(recipe_path, recipe_data)
 
+            # Detect embedded ComfyUI workflow and persist when it changed
+            if "has_workflow" not in recipe_data:
+                has_workflow = self._detect_has_workflow(recipe_data.get("file_path"))
+                if has_workflow != recipe_data.get("has_workflow"):
+                    recipe_data["has_workflow"] = has_workflow
+                    self._write_recipe_file(recipe_path, recipe_data)
+
             # Track folder placement relative to recipes directory
             recipe_data["folder"] = recipe_data.get("folder") or self._calculate_folder(
                 recipe_path
@@ -3302,6 +3340,13 @@ class RecipeScanner:
         # Format the recipe with all needed information
         formatted_recipe = {**merged_recipe}
 
+        # Fallback for recipes saved before has_workflow existed: detect once
+        # on demand so the modal button works without a rescan.
+        if "has_workflow" not in formatted_recipe:
+            formatted_recipe["has_workflow"] = self._detect_has_workflow(
+                formatted_recipe.get("file_path")
+            )
+
         # Format file path to URL
         if "file_path" in formatted_recipe:
             formatted_recipe["file_url"] = self._format_file_url(

py/services/recipes/persistence_service.py

@@ -117,6 +117,7 @@ class RecipePersistenceService:
             "loras": loras_data,
             "gen_params": gen_params,
             "fingerprint": fingerprint,
+            "has_workflow": self._detect_has_workflow(normalized_image_path),
         }
         if checkpoint_entry:
             recipe_data["checkpoint"] = checkpoint_entry
@@ -615,6 +616,9 @@ class RecipePersistenceService:
                 if key not in ["checkpoint", "loras"]
             },
             "loras_stack": lora_stack,
+            # Widget saves re-encode an in-memory tensor to PNG/WebP with no
+            # embedded metadata chunks, so a workflow can never be present.
+            "has_workflow": False,
         }
         if checkpoint_entry:
             recipe_data["checkpoint"] = checkpoint_entry
@@ -639,6 +643,20 @@ class RecipePersistenceService:
 
     # Helper methods ---------------------------------------------------
 
+    def _detect_has_workflow(self, image_path: str) -> bool:
+        """Detect whether the saved recipe image embeds a ComfyUI workflow.
+
+        Extraction failures (missing file, corrupt image, unsupported format)
+        map to ``False`` and never propagate, mirroring the scanner's behavior.
+        """
+        if not image_path or not os.path.exists(image_path):
+            return False
+        try:
+            metadata = self._exif_utils._load_structured_metadata(image_path)
+            return bool(metadata.get("workflow"))
+        except Exception:
+            return False
+
     async def _build_widget_checkpoint_entry(
         self,
         recipe_scanner,