Add an error message when GADM server is down (#890)

* Add an error message when GADM server is down

* Fix a timeout value

* Improve logging

* Replace logging with exception message

scripts/build_shapes.py

@@ -105,7 +105,19 @@ def download_GADM(country_code, update=False, out_logging=False):
         #  create data/osm directory
         os.makedirs(os.path.dirname(GADM_inputfile_gpkg), exist_ok=True)
 
-        with requests.get(GADM_url, stream=True) as r:
+        try:
+            r = requests.get(GADM_url, stream=True, timeout=300)
+        except (requests.exceptions.ConnectionError, requests.exceptions.Timeout):
+            raise Exception(
+                f"GADM server is down at {GADM_url}. Data needed for building shapes can't be extracted.\n\r"
+            )
+        except Exception as exception:
+            raise Exception(
+                f"An error happened when trying to load GADM data by {GADM_url}.\n\r"
+                + str(exception)
+                + "\n\r"
+            )
+        else:
             with open(GADM_inputfile_gpkg, "wb") as f:
                 shutil.copyfileobj(r.raw, f)