feat: add "onError" hook to generated clients

languages/dart/dart-client/lib/request.dart

@@ -126,26 +126,36 @@ Future<T> parsedArriRequest<T, E extends Exception>(
   HttpMethod method = HttpMethod.post,
   Map<String, dynamic>? params,
   FutureOr<Map<String, String>> Function()? headers,
+  Function(Object)? onError,
   String? clientVersion,
   required T Function(String) parser,
 }) async {
-  final result = await arriRequest(
-    url,
-    httpClient: httpClient,
-    method: method,
-    params: params,
-    headers: headers,
-    clientVersion: clientVersion,
-  );
-  if (result.statusCode >= 200 && result.statusCode <= 299) {
-    return parser(utf8.decode(result.bodyBytes));
+  final http.Response result;
+
+  try {
+    result = await arriRequest(
+      url,
+      httpClient: httpClient,
+      method: method,
+      params: params,
+      headers: headers,
+      clientVersion: clientVersion,
+    );
+    if (result.statusCode >= 200 && result.statusCode <= 299) {
+      return parser(utf8.decode(result.bodyBytes));
+    }
+  } catch (err) {
+    onError?.call(err);
+    rethrow;
   }
-  throw ArriError.fromResponse(result);
+  final err = ArriError.fromResponse(result);
+  onError?.call(err);
+  throw err;
 }
 
 /// Perform a raw HTTP request to an Arri RPC server. This function does not thrown an error. Instead it returns a request result
 /// in which both value and the error can be null.
-Future<ArriRequestResult<T>> parsedArriRequestSafe<T>(
+Future<ArriResult<T>> parsedArriRequestSafe<T>(
   String url, {
   http.Client? httpClient,
   HttpMethod httpMethod = HttpMethod.get,
@@ -164,22 +174,65 @@ Future<ArriRequestResult<T>> parsedArriRequestSafe<T>(
       method: httpMethod,
       httpClient: httpClient,
     );
-    return ArriRequestResult(value: result);
+    return ArriResultOk(result);
   } catch (err) {
-    return ArriRequestResult(error: err is ArriError ? err : null);
+    return ArriResultErr(
+      err is ArriError
+          ? err
+          : ArriError(
+              code: 0,
+              message: err.toString(),
+              data: err,
+            ),
+    );
   }
 }
 
-/// Container for holding a request result or a request error
-class ArriRequestResult<T> {
-  final T? value;
-  final ArriError? error;
-  const ArriRequestResult({this.value, this.error});
+/// Container for holding a request data or a request error
+sealed class ArriResult<T> {
+  bool get isOk;
+  bool get isErr;
+  T? get unwrap;
+  T unwrapOr(T fallback);
+  ArriError? get unwrapErr;
 }
 
-/// Abstract endpoint to use as a base for generated client route enums
-abstract class ArriEndpoint {
-  final String path;
-  final HttpMethod method;
-  const ArriEndpoint({required this.path, required this.method});
+class ArriResultOk<T> implements ArriResult<T> {
+  final T _data;
+  const ArriResultOk(this._data);
+
+  @override
+  bool get isOk => true;
+
+  @override
+  bool get isErr => false;
+
+  @override
+  T get unwrap => _data;
+
+  @override
+  T unwrapOr(T fallback) => _data;
+
+  @override
+  ArriError? get unwrapErr => null;
+}
+
+class ArriResultErr<T> implements ArriResult<T> {
+  final ArriError _err;
+  const ArriResultErr(this._err);
+
+  @override
+  bool get isErr => true;
+
+  @override
+  bool get isOk => false;
+
+  @override
+  T? get unwrap => null;
+
+  @override
+  ArriError get unwrapErr => _err;
+
+  @override
+  T unwrapOr(T fallback) => fallback;
 }

languages/dart/dart-client/lib/ws.dart

@@ -10,6 +10,7 @@ Future<ArriWebsocketController<TServerMessage, TClientMessage>>
   FutureOr<Map<String, String>> Function()? headers,
   required TServerMessage Function(String msg) parser,
   required String Function(TClientMessage msg) serializer,
+  Function(Object)? onError,
   String? clientVersion,
 }) async {
   var finalUrl =

languages/dart/dart-client/test/arri_client_test.dart

@@ -9,9 +9,7 @@ main() {
   test("invalid url", () async {
     final response =
         await parsedArriRequestSafe(nonExistentUrl, parser: (data) {});
-    if (response.error != null) {
-      expect(response.error!.code, equals(500));
-    }
+    expect(response.unwrapErr?.code, equals(0));
   });
 
   test('auto retry sse', () async {

languages/dart/dart-codegen-reference/lib/reference_client.dart

@@ -9,14 +9,17 @@ class ExampleClient {
   final http.Client? _httpClient;
   final String _baseUrl;
   final String _clientVersion = "20";
-  late final FutureOr<Map<String, String>> Function()? _headers;
+  final FutureOr<Map<String, String>> Function()? _headers;
+  final Function(Object)? _onError;
   ExampleClient({
     http.Client? httpClient,
     required String baseUrl,
     FutureOr<Map<String, String>> Function()? headers,
+    Function(Object)? onError,
   })  : _httpClient = httpClient,
         _baseUrl = baseUrl,
-        _headers = headers;
+        _headers = headers,
+        _onError = onError;
 
   Future<NestedObject> sendObject(NestedObject params) async {
     return parsedArriRequest(
@@ -27,28 +30,33 @@ class ExampleClient {
       clientVersion: _clientVersion,
       params: params.toJson(),
       parser: (body) => NestedObject.fromJsonString(body),
+      onError: _onError,
     );
   }
 
   ExampleClientBooksService get books => ExampleClientBooksService(
         baseUrl: _baseUrl,
         headers: _headers,
         httpClient: _httpClient,
+        onError: _onError,
       );
 }
 
 class ExampleClientBooksService {
   final http.Client? _httpClient;
   final String _baseUrl;
   final String _clientVersion = "20";
-  late final FutureOr<Map<String, String>> Function()? _headers;
+  final FutureOr<Map<String, String>> Function()? _headers;
+  final Function(Object)? _onError;
   ExampleClientBooksService({
     http.Client? httpClient,
     required String baseUrl,
     FutureOr<Map<String, String>> Function()? headers,
+    Function(Object)? onError,
   })  : _httpClient = httpClient,
         _baseUrl = baseUrl,
-        _headers = headers;
+        _headers = headers,
+        _onError = onError;
 
   /// Get a book
   Future<Book> getBook(BookParams params) async {
@@ -60,6 +68,7 @@ class ExampleClientBooksService {
       clientVersion: _clientVersion,
       params: params.toJson(),
       parser: (body) => Book.fromJsonString(body),
+      onError: _onError,
     );
   }
 
@@ -74,6 +83,7 @@ class ExampleClientBooksService {
       clientVersion: _clientVersion,
       params: params.toJson(),
       parser: (body) => Book.fromJsonString(body),
+      onError: _onError,
     );
   }
 
@@ -103,7 +113,16 @@ class ExampleClientBooksService {
       onMessage: onMessage,
       onOpen: onOpen,
       onClose: onClose,
-      onError: onError,
+      onError: onError != null && _onError != null
+          ? (err, es) {
+              _onError?.call(onError);
+              return onError(err, es);
+            }
+          : onError != null
+              ? onError
+              : _onError != null
+                  ? (err, _) => _onError?.call(err)
+                  : null,
     );
   }
 
@@ -114,6 +133,7 @@ class ExampleClientBooksService {
       clientVersion: _clientVersion,
       parser: (msg) => Book.fromJsonString(msg),
       serializer: (msg) => msg.toJsonString(),
+      onError: _onError,
     );
   }
 }

languages/dart/dart-codegen/README.md

@@ -69,28 +69,37 @@ final service = MyClientUsersService(
 );
 ```
 
+#### Client / Service Options
+
+| name       | Type                                        | description                                                   |
+| ---------- | ------------------------------------------- | ------------------------------------------------------------- |
+| httpClient | `http.Client`                               | Use this to pass in a custom `http.Client` instance           |
+| baseUrl    | `String`                                    | The base url for the backend server                           |
+| headers    | `FutureOr<Map<String, String>> Function()?` | A function that returns a Map of headers                      |
+| onError    | `Function(Object)?`                         | A hook that fires whenever any error is thrown by the client. |
+
 ### Using Arri Models
 
 All generated models will be immutable. They will have access to the following features:
 
 **Methods**:
 
--   `Map<String, dynamic> toJson()`
--   `String toJsonString()`
--   `String toUrlQueryParams()`
--   `copyWith()`
+- `Map<String, dynamic> toJson()`
+- `String toJsonString()`
+- `String toUrlQueryParams()`
+- `copyWith()`
 
 **Factory Methods**:
 
--   `empty()`
--   `fromJson(Map<String, dynamic> input)`
--   `fromJsonString(String input)`
+- `empty()`
+- `fromJson(Map<String, dynamic> input)`
+- `fromJsonString(String input)`
 
 **Overrides**:
 
--   `==` operator (allows for deep equality checking)
--   `hashMap` (allows for deep equality checking)
--   `toString` (will print out all properties and values instead of `Instance of X`)
+- `==` operator (allows for deep equality checking)
+- `hashMap` (allows for deep equality checking)
+- `toString` (will print out all properties and values instead of `Instance of X`)
 
 This library was generated with [Nx](https://nx.dev).
 

languages/dart/dart-codegen/src/_index.ts

@@ -167,14 +167,17 @@ class ${clientName} {
   final http.Client? _httpClient;
   final String _baseUrl;
   final String _clientVersion = "${context.clientVersion ?? ""}";
-  late final FutureOr<Map<String, String>> Function()? _headers;
+  final FutureOr<Map<String, String>> Function()? _headers;
+  final Function(Object)? _onError;
   ${clientName}({
     http.Client? httpClient,
     required String baseUrl,
     FutureOr<Map<String, String>> Function()? headers,
+    Function(Object)? onError,
   }) : _httpClient = httpClient,
        _baseUrl = baseUrl,
-       _headers = headers;
+       _headers = headers,
+       _onError = onError;
 
   ${rpcParts.join("\n\n")}
 
@@ -184,6 +187,7 @@ ${subServices
           baseUrl: _baseUrl,
           headers: _headers,
           httpClient: _httpClient,
+          onError: _onError,
         );`,
     )
     .join("\n\n")}

languages/dart/dart-codegen/src/procedures.ts

@@ -74,7 +74,16 @@ export function dartHttpRpcFromSchema(
                 onMessage: onMessage,
                 onOpen: onOpen,
                 onClose: onClose,
-                onError: onError,
+                onError: onError != null && _onError != null
+                    ? (err, es) {
+                        _onError?.call(onError);
+                        return onError(err, es);
+                    }
+                    : onError != null
+                        ? onError
+                        : _onError != null
+                            ? (err, _) => _onError?.call(err)
+                            : null,
             );
         }`;
     }
@@ -87,6 +96,7 @@ export function dartHttpRpcFromSchema(
             clientVersion: _clientVersion,
             ${paramsType ? "params: params.toJson()," : ""}
             parser: (body) ${schema.response ? `=> ${responseType}.fromJsonString(body)` : "{}"},
+            onError: _onError,
         );
     }`;
 }
@@ -120,6 +130,7 @@ export function dartWsRpcFromSchema(
             clientVersion: _clientVersion,
             parser: (msg) ${responseType ? `=> ${responseType}.fromJsonString(msg)` : "{}"},
             serializer: (msg) ${paramsType ? "=> msg.toJsonString()" : '=> ""'},
+            onError: _onError,
         );
     }`;
 }
@@ -180,14 +191,17 @@ export function dartServiceFromSchema(
   final http.Client? _httpClient;
   final String _baseUrl;
   final String _clientVersion = "${context.clientVersion}";
-  late final FutureOr<Map<String, String>> Function()? _headers;
+  final FutureOr<Map<String, String>> Function()? _headers;
+  final Function(Object)? _onError;
   ${serviceName}({
     http.Client? httpClient,
     required String baseUrl,
     FutureOr<Map<String, String>> Function()? headers,
+    Function(Object)? onError,
   }) : _httpClient = httpClient,
        _baseUrl = baseUrl,
-       _headers = headers;
+       _headers = headers,
+       _onError = onError;
 
   ${rpcParts.join("\n\n")}
 
@@ -197,6 +211,7 @@ export function dartServiceFromSchema(
           baseUrl: _baseUrl,
           headers: _headers,
           httpClient: _httpClient,
+          onError: _onError,
         );`,
       )
       .join("\n\n")}