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+---
+title: "基础流编程"
+date: 2025-01-10
+weight: 1
+keywords: ["基础流编程"]
+description: ""
+---
+
+## 选择协议
+
+当前支持：
+
+- **TTHeader Streaming**
+
+  - 传输协议：TTHeader
+  - IDL 定义语言 与 序列化协议：Thrift
+- **gRPC Streaming**:~~~~  (计划实现)
+
+  - ~~传输协议：gRPC~~
+  - ~~IDL 定义语言 与 序列化协议：Protobuf 编码~~
+
+此处选定的协议只影响从 IDL 生成代码，无论哪种协议，以下用法均一致。
+
+## 使用方法
+
+### 生成代码
+
+#### 定义 IDL
+
+##### Thrift
+
+文件 `echo.thrift`:
+
+```go
+namespace go echo
+
+service TestService {
+    Response PingPong(1: Request req) // PingPong 非流式接口
+    
+    Response Echo (1: Request req) (streaming.mode="bidirectional"),
+    Response EchoClient (1: Request req) (streaming.mode="client"),
+    Response EchoServer (1: Request req) (streaming.mode="server"),
+}
+```
+
+#### 生成代码
+
+为保持与旧流式生成代码的兼容，命令行需加上 `-streamx` flag。
+
+```
+kitex -streamx -module <go module> -service P.S.M echo.thrift
+```
+
+##### 初始化
+
+#### 创建 Client
+
+```go
+// 生成代码目录，streamserver 为 IDL 定义的 service name
+import ".../kitex_gen/echo/testservice"
+import "github.com/cloudwego/kitex/client/streamxclient"
+
+cli, err := testservice.NewClient(
+    "a.b.c",
+    streamxclient.WithStreamRecvMiddleware(...),
+    streamxclient.WithStreamSendMiddleware(...),
+)
+```
+
+#### 创建 Server
+
+```go
+import ".../kitex_gen/echo/streamserver"
+import "github.com/cloudwego/kitex/server/streamxserver"
+
+svr := streamserver.NewServer(
+    new(serviceImpl),
+    streamxserver.WithStreamRecvMiddleware(...),
+    streamxserver.WithStreamSendMiddleware(...),
+)
+```
+
+### Client Streaming
+
+#### 使用场景
+
+Client 需要发送多份数据给 Server 端，Server 端可以发送一条消息给 Client:
+
+```go
+------------------- [Client Streaming] -------------------
+--------------- (stream Req) returns (Res) ---------------
+client.Send(req)         === req ==>       server.Recv(req)
+                             ...
+client.Send(req)         === req ==>       server.Recv(req)
+
+client.CloseSend()       === EOF ==>       server.Recv(EOF)
+client.Recv(res)         <== res ===       server.SendAndClose(res)
+** OR
+client.CloseAndRecv(res) === EOF ==>       server.Recv(EOF)
+                         <== res ===       server.SendAndClose(res)
+```
+
+#### Client 用法
+
+- [**必须**]: client 必须调用 CloseAndRecv() 或者 (CloseSend + Recv)方法，告知 Server 不再有新数据发送。
+
+```go
+ctx, cs, err := cli.ClientStream(ctx)
+for i := 0; i < 3; i++ {
+    err = cs.Send(ctx, req)
+}
+res, err = cs.CloseAndRecv(ctx)
+```
+
+#### Server 用法
+
+- [**必须**]: server 必须在 handler 结束时返回一个 Response，告知 Client 最终结果。
+
+```go
+
+func (si *serviceImpl) ClientStream(
+    ctx context.Context, stream streamx.ClientStreamingServer[Request, Response]
+) (res *Response, err error) {
+    for {
+       req, err := stream.Recv(ctx)
+       if err == io.EOF {
+           res := new(Response)
+           return res, nil
+       }
+       if err != nil {
+          return nil, err
+       }
+    }
+}
+```
+
+### Server Streaming
+
+#### 使用场景
+
+典型场景：ChatGPT 类型业务
+
+Client 发送一个请求给 Server，Server 发送多个返回给 Client:
+
+```go
+------------------- [Server Streaming] -------------------
+---------- (Request) returns (stream Response) ----------
+client.Send(req)   === req ==>   server.Recv(req)
+client.Recv(res)   <== res ===   server.Send(req)
+                       ...
+client.Recv(res)   <== res ===   server.Send(req)
+client.Recv(EOF)   <== EOF ===   server handler return
+```
+
+#### Client 用法
+
+- [**必须**]: client 必须判断 io.EOF 错误，并结束循环
+
+```go
+ctx, ss, err := cli.ServerStream(ctx, req)
+for {
+    res, err := ss.Recv(ctx)
+    if errors.Is(err, io.EOF) {
+       break
+    }
+}
+```
+
+#### Server 用法
+
+```go
+func (si *serviceImpl) ServerStream(ctx context.Context, req *Request, stream streamx.ServerStreamingServer[Response]) error {
+    for i := 0; i < 3; i++ {
+       err := stream.Send(ctx, resp)
+       if err != nil {
+          return err
+       }
+    }
+    return nil
+}
+```
+
+### Bidirectional Streaming
+
+#### 使用场景
+
+Client 与 Server 可能需要或者未来有可能需要发送多条消息：
+
+```go
+----------- [Bidirectional Streaming] -----------
+--- (stream Request) returns (stream Response) ---
+* goroutine 1 *
+client.Send(req)   === req ==>   server.Recv(req)
+                       ...
+client.Send(req)   === req ==>   server.Recv(req)
+client.CloseSend() === EOF ==>   server.Recv(EOF)
+
+* goroutine 2 *
+client.Recv(res)   <== res ===   server.Send(req)
+                       ...
+client.Recv(res)   <== res ===   server.Send(req)
+client.Recv(EOF)   <== EOF ===   server handler return
+```
+
+#### Client 用法
+
+- [**必须**]: client 必须在发送结束后调用 CloseSend
+- [**必须**]: client 必须在 Recv 时，判断 io.EOF 并结束循环
+
+```go
+ctx, bs, err := cli.BidiStream(ctx)
+var wg sync.WaitGroup
+wg.Add(2)
+go func() {
+    defer wg.Done()
+    for i := 0; i < round; i++ {
+       err := bs.Send(ctx, req)
+    }
+    err = bs.CloseSend(ctx)
+}()
+go func() {
+    defer wg.Done()
+    for {
+       res, err := bs.Recv(ctx)
+       if errors.Is(err, io.EOF) {
+          break
+       }
+    }
+}()
+wg.Wait()
+```
+
+#### Server 用法
+
+- [**必须**]: server 必须在 Recv 时，判断 io.EOF 并结束循环
+
+```go
+func (si *serviceImpl) BidiStream(ctx context.Context, stream streamx.BidiStreamingServer[Request, Response]) error {
+    for {
+       req, err := stream.Recv(ctx)
+       if err == io.EOF {
+          return nil
+       }
+       if err != nil {
+          return err
+       }
+       err = stream.Send(ctx, resp)
+       if err != nil {
+          return err
+       }
+    }
+}
+```