prevent backfill from exploding when a primary file name on another model does not exist

spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py

@@ -94,6 +94,9 @@ from spiffworkflow_backend.scripts.script import Script
 from spiffworkflow_backend.services.file_system_service import FileSystemService
 from spiffworkflow_backend.services.process_model_service import ProcessModelService
 from spiffworkflow_backend.services.service_task_service import ServiceTaskDelegate
+from spiffworkflow_backend.services.spec_file_service import (
+    ProcessModelFileNotFoundError,
+)
 from spiffworkflow_backend.services.spec_file_service import SpecFileService
 from spiffworkflow_backend.services.user_service import UserService
 
@@ -669,10 +672,14 @@ class ProcessInstanceProcessor:
         process_models = ProcessModelService().get_process_models()
         for process_model in process_models:
             if process_model.primary_file_name:
-                etree_element = SpecFileService.get_etree_element_from_file_name(
-                    process_model, process_model.primary_file_name
-                )
-                bpmn_process_identifiers = []
+                try:
+                    etree_element = SpecFileService.get_etree_element_from_file_name(
+                        process_model, process_model.primary_file_name
+                    )
+                    bpmn_process_identifiers = []
+                except ProcessModelFileNotFoundError:
+                    # if primary_file_name doesn't actually exist on disk, then just go on to the next process_model
+                    continue
 
                 try:
                     bpmn_process_identifiers = (
@@ -700,6 +707,11 @@ class ProcessInstanceProcessor:
         bpmn_process_identifier: str,
     ) -> str:
         """Bpmn_file_full_path_from_bpmn_process_identifier."""
+        if bpmn_process_identifier is None:
+            raise ValueError(
+                "bpmn_file_full_path_from_bpmn_process_identifier: bpmn_process_identifier is unexpectedly None"
+            )
+
         bpmn_process_id_lookup = BpmnProcessIdLookup.query.filter_by(
             bpmn_process_identifier=bpmn_process_identifier
         ).first()

spiffworkflow-backend/src/spiffworkflow_backend/services/spec_file_service.py

@@ -27,6 +27,10 @@ from spiffworkflow_backend.services.file_system_service import FileSystemService
 from spiffworkflow_backend.services.process_model_service import ProcessModelService
 
 
+class ProcessModelFileNotFoundError(Exception):
+    """ProcessModelFileNotFoundError."""
+
+
 class SpecFileService(FileSystemService):
     """SpecFileService."""
 
@@ -90,9 +94,8 @@ class SpecFileService(FileSystemService):
         """Get_data."""
         file_path = SpecFileService.file_path(process_model_info, file_name)
         if not os.path.exists(file_path):
-            raise ApiError(
-                "unknown_file",
-                f"No file found with name {file_name} in {process_model_info.display_name}",
+            raise ProcessModelFileNotFoundError(
+                f"No file found with name {file_name} in {process_model_info.display_name}"
             )
         with open(file_path, "rb") as f_handle:
             spec_file_data = f_handle.read()