Merge pull request #94 from ecmwf-projects/COPDS-1390-exceptions

Enable human-readable exception message by Processing API

cads_broker/database.py

@@ -8,6 +8,7 @@
 
 import cacholote
 import sqlalchemy as sa
+import sqlalchemy.exc
 import sqlalchemy.orm.exc
 import sqlalchemy_utils
 import structlog
@@ -31,6 +32,10 @@ class NoResultFound(Exception):
     pass
 
 
+class InvalidRequestID(Exception):
+    pass
+
+
 class AdaptorProperties(BaseModel):
     """Adaptor Metadata ORM model."""
 
@@ -544,6 +549,8 @@ def get_request(
             SystemRequest.request_uid == request_uid
         )
         return session.scalars(statement).one()
+    except sqlalchemy.exc.DataError:
+        raise InvalidRequestID(f"Invalid request_uid {request_uid}")
     except sqlalchemy.orm.exc.NoResultFound:
         logger.exception("get_request failed")
         raise NoResultFound(f"No request found with request_uid {request_uid}")