dify

dify/api/models/_workflow_exc.py

@@ -0,0 +1,20 @@
+"""All these exceptions are not meant to be caught by callers."""
+
+
+class WorkflowDataError(Exception):
+    """Base class for all workflow data related exceptions.
+
+    This should be used to indicate issues with workflow data integrity, such as
+    no `graph` configuration, missing `nodes` field in `graph` configuration, or
+    similar issues.
+    """
+
+    pass
+
+
+class NodeNotFoundError(WorkflowDataError):
+    """Raised when a node with the specified ID is not found in the workflow."""
+
+    def __init__(self, node_id: str):
+        super().__init__(f"Node with ID '{node_id}' not found in the workflow.")
+        self.node_id = node_id