tidy(app): make workflow thumbnails base class an ABC, move it to own file

invokeai/app/services/workflow_thumbnails/workflow_thumbnails_base.py

@@ -0,0 +1,28 @@
+from abc import ABC, abstractmethod
+from pathlib import Path
+
+from PIL import Image
+
+
+class WorkflowThumbnailServiceBase(ABC):
+    """Base class for workflow thumbnail services"""
+
+    @abstractmethod
+    def get_path(self, workflow_id: str) -> Path:
+        """Gets the path to a workflow thumbnail"""
+        pass
+
+    @abstractmethod
+    def get_url(self, workflow_id: str) -> str | None:
+        """Gets the URL of a workflow thumbnail"""
+        pass
+
+    @abstractmethod
+    def save(self, workflow_id: str, image: Image.Image) -> None:
+        """Saves a workflow thumbnail"""
+        pass
+
+    @abstractmethod
+    def delete(self, workflow_id: str) -> None:
+        """Deletes a workflow thumbnail"""
+        pass

invokeai/app/services/workflow_thumbnails/workflow_thumbnails_common.py

@@ -1,8 +1,3 @@
-from pathlib import Path
-
-from PIL import Image
-
-
 class WorkflowThumbnailFileNotFoundException(Exception):
     """Raised when a workflow thumbnail file is not found"""
 
@@ -25,23 +20,3 @@ class WorkflowThumbnailFileDeleteException(Exception):
     def __init__(self, message: str = "Workflow thumbnail file cannot be deleted"):
         self.message = message
         super().__init__(self.message)
-
-
-class WorkflowThumbnailServiceBase:
-    """Base class for workflow thumbnail services"""
-
-    def get_path(self, workflow_id: str) -> Path:
-        """Gets the path to a workflow thumbnail"""
-        raise NotImplementedError
-
-    def get_url(self, workflow_id: str) -> str | None:
-        """Gets the URL of a workflow thumbnail"""
-        raise NotImplementedError
-
-    def save(self, workflow_id: str, image: Image.Image) -> None:
-        """Saves a workflow thumbnail"""
-        raise NotImplementedError
-
-    def delete(self, workflow_id: str) -> None:
-        """Deletes a workflow thumbnail"""
-        raise NotImplementedError

invokeai/app/services/workflow_thumbnails/workflow_thumbnails_disk.py

@@ -4,11 +4,11 @@ from PIL import Image
 from PIL.Image import Image as PILImageType
 
 from invokeai.app.services.invoker import Invoker
+from invokeai.app.services.workflow_thumbnails.workflow_thumbnails_base import WorkflowThumbnailServiceBase
 from invokeai.app.services.workflow_thumbnails.workflow_thumbnails_common import (
     WorkflowThumbnailFileDeleteException,
     WorkflowThumbnailFileNotFoundException,
     WorkflowThumbnailFileSaveException,
-    WorkflowThumbnailServiceBase,
 )
 from invokeai.app.util.misc import uuid_string
 from invokeai.app.util.thumbnails import make_thumbnail