doc: sync Stream Error Handling (#1194)

content/en/docs/kitex/Tutorials/basic-feature/Kitex+StreamX+-+Stream+Error+Handling.md

@@ -0,0 +1,83 @@
+---
+title: "Stream Error Handling"
+date: 2025-01-13
+weight: 1
+keywords: ["Stream Error Handling"]
+description: ""
+---
+
+## Preface
+
+Unlike  RPC, stream errors can occur at any time during stream processing. For example, a server can return an error after sending multiple messages. However, once a stream has sent an error, it cannot send any more messages.
+
+## Error type
+
+### Business exception
+
+**Usage example** : For example, in the ChatGPT scenario, we need to constantly check whether the user account balance can continue to call the large model to generate returns.
+
+Server implementation:
+
+```go
+func (si *streamingService) ServerStreamWithErr(ctx context.Context, req *Request, stream streamx.ServerStreamingServer[Response]) error {
+    // 检查用户账户余额
+    for isHasBalance (req.UserId) {
+        stream.Send(ctx, res)
+    }
+    // 返回用户余额不足错误
+    bizErr := kerrors.NewBizStatusErrorWithExtra(
+        10001, "insufficient user balance", map[string]string{"testKey": "testVal"}，
+    )
+    return bizErr
+}
+```
+
+Client implementation:
+
+```go
+svrStream, err = streamClient.ServerStreamWithErr(ctx, req)
+
+var err error
+for {
+    res, err = stream.Recv(ctx)
+    if err != nil {
+         break
+    }
+}
+bizErr, ok := kerrors.FromBizStatusError(err)
+if ok {
+    println(bizErr.BizStatusCode(), bizErr.BizMessage(), bizErr.BizExtra())
+}
+```
+
+### Other errors
+
+If the Error returned by the Server is a non-business exception, the framework will be uniformly encapsulated as `(* thrift.ApplicationException) `. At this time, only the error Message can be obtained.
+
+Server implementation:
+
+```go
+func (si *streamingService) ServerStreamWithErr(ctx context.Context, req *Request, stream streamx.ServerStreamingServer[Response]) error {
+    // ...
+    return errors.New("test error")
+}
+```
+
+Client implementation:
+
+```go
+svrStream, err = streamClient.ServerStreamWithErr(ctx, req)
+test.Assert(t, err == nil, err)
+
+var err error
+for {
+    res, err = stream.Recv(ctx)
+    if err != nil {
+         break
+    }
+}
+ex, ok := err.(*thrift.ApplicationException)
+if ok {
+     println(ex.TypeID(), ex.Msg())
+}
+```