Merge pull request #1 from axinc-ai/masa8/issue86

Avoid Unhandled exceptions being raised

Author: Hiroyuki-Nakayama8

lib/src/core/networking/client.dart

@@ -339,52 +339,30 @@ abstract class OpenAINetworkingClient {
     required T Function(Map<String, dynamic>) onSuccess,
     required Map<String, dynamic> body,
     http.Client? client,
-  }) {
-    final controller = StreamController<T>();
-
+  }) async* {
     try {
       final clientForUse = client ?? _streamingHttpClient();
-
       final uri = Uri.parse(to);
-
       final headers = HeadersBuilder.build();
-
       final httpMethod = OpenAIStrings.postMethod;
-
       final request = http.Request(httpMethod, uri);
-
       request.headers.addAll(headers);
-
       request.body = jsonEncode(body);
 
-      Future<void> close() {
-        return Future.wait([
-          if (client == null) Future.delayed(Duration.zero, clientForUse.close),
-          controller.close(),
-        ]);
-      }
-
       OpenAILogger.logStartRequest(to);
+      try {
+        final respond = await clientForUse.send(request);
 
-      clientForUse
-          .send(request)
-          // .timeout(
-          //   OpenAIConfig.requestsTimeOut,
-          //   onTimeout: () {
-          //     throw TimeoutException("Request timed out");
-          //   },
-          // )
-          .then(
-        (respond) {
+        try {
           OpenAILogger.startReadStreamResponse();
-
           final stream = respond.stream
               .transform(utf8.decoder)
               .transform(openAIChatStreamLineSplitter);
 
-          String respondData = "";
-          stream.where((event) => event.isNotEmpty).listen(
-            (value) {
+          try {
+            String respondData = "";
+            await for (final value
+                in stream.where((event) => event.isNotEmpty)) {
               final data = value;
               respondData += data;
 
@@ -398,14 +376,10 @@ abstract class OpenAINetworkingClient {
                   final String data = line.substring(6);
                   if (data.contains(OpenAIStrings.streamResponseEnd)) {
                     OpenAILogger.streamResponseDone();
-
-                    return;
+                    break;
                   }
-
                   final decoded = jsonDecode(data) as Map<String, dynamic>;
-
-                  controller.add(onSuccess(decoded));
-
+                  yield onSuccess(decoded);
                   continue;
                 }
 
@@ -422,29 +396,24 @@ abstract class OpenAINetworkingClient {
                   final statusCode = respond.statusCode;
                   final exception = RequestFailedException(message, statusCode);
 
-                  controller.addError(exception);
+                  yield* Stream<T>.error(error); // Error cases sent from openai
                 }
               }
-            },
-            onDone: () {
-              close();
-            },
-            onError: (error, stackTrace) {
-              controller.addError(error, stackTrace);
-            },
-          );
-        },
-        onError: (error, stackTrace) {
-          controller.addError(error, stackTrace);
-        },
-      ).catchError((e) {
-        controller.addError(e);
-      });
+            } // end of await for
+          } catch (error, stackTrace) {
+            yield* Stream<T>.error(
+                error, stackTrace); // Error cases in handling stream
+          }
+        } catch (error, stackTrace) {
+          yield* Stream<T>.error(error,
+              stackTrace); // Error cases in decoding stream from response
+        }
+      } catch (e) {
+        yield* Stream<T>.error(e); // Error cases in getting response
+      }
     } catch (e) {
-      controller.addError(e);
+      yield* Stream<T>.error(e); //Error cases in making request
     }
-
-    return controller.stream;
   }
 
   static Future imageEditForm<T>({