improving logging

appetiser.py

@@ -1,3 +1,5 @@
+import subprocess
+
 from app.json_utils import (
     extract_process_kwargs,
     extract_response_items,
@@ -50,14 +52,34 @@ def ping():
 def convert():
     json_data = flask.request.get_json()
     appetiser.logger.info('Processing request data: %s', json_data)
-    result = process(**extract_process_kwargs(json_data))
-    proto_reponse = {
-        **result,
-        **extract_response_items(json_data)
-    }
-    response = add_iiif_info_json(proto_reponse)
-    appetiser.logger.info('Response: %s', json_data)
-    return flask.jsonify(response)
+    try:
+        result = process(**extract_process_kwargs(json_data))
+        proto_reponse = {
+            **result,
+            **extract_response_items(json_data)
+        }
+        response = add_iiif_info_json(proto_reponse)
+        appetiser.logger.info('Response: %s', json_data)
+        return flask.jsonify(response)
+    except FileNotFoundError as fileError:
+        appetiser.logger.exception('Error: %s', fileError)
+        return flask.jsonify(
+            status='file not found',
+            message=str(fileError)
+        ), 400
+    except subprocess.CalledProcessError as subprocess_error:
+        appetiser.logger.exception('Error: %s', subprocess_error.stderr)
+        return flask.jsonify(
+            status='kakadu error',
+            message=str(subprocess_error.stderr)
+        ), 500
+    except Exception as general_error:
+        appetiser.logger.exception('Error: %s', general_error)
+
+        return flask.jsonify(
+            status='server error',
+            message=str(general_error)
+        ), 500
 
 
 if __name__ == '__main__':