Add bad request response when pipeline run not in terminable state

src/api/src/backend/models.py

@@ -240,6 +240,8 @@
     (RUN_STATUS_DEFERRED, "deferred")
 ]
 
+TERMINAL_STATUSES = [RUN_STATUS_FAILED, RUN_STATUS_COMPLETED, RUN_STATUS_TERMINATED]
+
 EXEC_STATUS_PENDING = "pending"
 EXEC_STATUS_ACTIVE = "active"
 EXEC_STATUS_STAGING = "staging"

src/api/src/backend/views/PipelineRuns.py

@@ -10,7 +10,7 @@
     BadRequest
 )
 from backend.services.GroupService import service as group_service
-from backend.models import PipelineRun, Pipeline
+from backend.models import PipelineRun, Pipeline, TERMINAL_STATUSES
 from backend.helpers.PipelineDispatchRequestBuilder import PipelineDispatchRequestBuilder
 from backend.services.PipelineDispatcher import service as pipeline_dispatcher
 from backend.errors.api import ServerError
@@ -61,6 +61,9 @@ def post(self, request, group_id, pipeline_id, pipeline_run_uuid):
 
             if not pipeline_run:
                 return BadRequest(f"PiplineRun with uuid '{pipeline_run_uuid}' does not exist")
+
+            if pipeline_run.status not in TERMINAL_STATUSES:
+                return BadRequest(f"PiplineRun with uuid '{pipeline_run_uuid}' is not in a terminable state")
 
             try:
                 # Build the pipeline dispatch request