ws

bff/internal/wsproxy/proxy.go

@@ -0,0 +1,123 @@
+package wsproxy
+
+import (
+	"context"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+	"github.com/zeromicro/go-zero/core/logx"
+	"github.com/zeromicro/go-zero/zrpc"
+	"google.golang.org/grpc"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+type StreamCreator func(ctx context.Context) (grpc.ClientStream, error)
+
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+func NewWsProxyHandler(createStream StreamCreator, newFrame func() protoreflect.ProtoMessage) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		conn, err := upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			return
+		}
+		defer conn.Close()
+
+		stream, err := createStream(r.Context())
+		if err != nil {
+			return
+		}
+		defer stream.CloseSend()
+
+		// 上行 ws -> grpc stream
+		go func() {
+			for {
+				_, rawBytes, err := conn.ReadMessage()
+				if err != nil {
+					return
+				}
+				msg := newFrame()
+				fd := msg.ProtoReflect().Descriptor().Fields().ByName("raw_body")
+				msg.ProtoReflect().Set(fd, protoreflect.ValueOfBytes(rawBytes))
+				_ = stream.SendMsg(msg)
+			}
+		}()
+
+		// 下行 grpc stream -> ws
+		for {
+			msg := newFrame()
+			err := stream.RecvMsg(msg)
+			if err != nil {
+				break
+			}
+			fd := msg.ProtoReflect().Descriptor().Fields().ByName("raw_body")
+			val := msg.ProtoReflect().Get(fd)
+			_ = conn.WriteMessage(websocket.TextMessage, val.Bytes())
+		}
+	}
+}
+
+// 全局rpc客户端管理器，线程安全
+type RpcClientManager struct {
+	mu         sync.RWMutex
+	client     zrpc.Client
+	ready      bool
+	cfg        zrpc.RpcClientConf
+	streamOpts []zrpc.ClientOption
+}
+
+func NewRpcClientManager(cfg zrpc.RpcClientConf, streamOpts ...zrpc.ClientOption) *RpcClientManager {
+	m := &RpcClientManager{
+		cfg:        cfg,
+		streamOpts: streamOpts,
+	}
+	go m.loopReconnect()
+	return m
+}
+
+// 尝试建立一次连接
+func (m *RpcClientManager) tryConnect() error {
+	cli, err := zrpc.NewClient(m.cfg, m.streamOpts...)
+	if err != nil {
+		logx.Errorf("tryConnect: create client failed, err=%v", err)
+		return err
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.client = cli
+	m.ready = true
+	return nil
+}
+
+// 后台循环重试
+func (m *RpcClientManager) loopReconnect() {
+	ticker := time.NewTicker(5 * time.Second)
+	defer ticker.Stop()
+	for range ticker.C {
+		m.mu.RLock()
+		ready := m.ready
+		m.mu.RUnlock()
+		if ready {
+			logx.Debug("rpc client already ready, skip reconnect")
+			continue
+		}
+		if err := m.tryConnect(); err != nil {
+			logx.Errorf("loopReconnect reconnect failed: %v", err)
+		}
+	}
+}
+
+// 获取client，判断是否就绪
+func (m *RpcClientManager) GetClient() (zrpc.Client, bool) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.client, m.ready
+}