Move error handling to startup commands

Author: tpoliaw

justfile

@@ -39,7 +39,17 @@ repl:
     #!/usr/bin/env bash
     uv run --with ptpython ptpython -i <(cat << EOF
     from blueapi.client import BlueapiClient
+    from blueapi.client.rest import ServiceUnavailableError
     bc = BlueapiClient.from_config_file("tests/system_tests/config.yaml").with_instrument_session("cm12345-1")
-    bc.login()
+    try:
+        bc.login()
+    except KeyboardInterrupt:
+        print("Login cancelled")
+    except ServiceUnavailableError:
+        print("Couldn't access blueapi server to log in")
+    except Exception as e:
+        import traceback
+        print("Couldn't log in")
+        traceback.print_exception(e, chain=False)
     EOF
     )

src/blueapi/client/client.py

@@ -770,11 +770,8 @@ def login(self, token_path: Path | None = None):
                 auth = SessionManager(
                     oidc, cache_manager=SessionCacheManager(token_path)
                 )
-                try:
-                    auth.start_device_flow()
-                    self._rest.session_manager = auth
-                except KeyboardInterrupt:
-                    pass
+                auth.start_device_flow()
+                self._rest.session_manager = auth
             else:
                 print("Server is not configured to use authentication!")