Add fabric websocket transport adapter

agents/rap-node-agent/internal/fabricproto/websocket.go

@@ -0,0 +1,67 @@
+package fabricproto
+
+import (
+	"context"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+type WebSocketTransportConfig struct {
+	MaxPayload   int
+	WriteTimeout time.Duration
+}
+
+func (l TransportLoop) RunWebSocket(ctx context.Context, conn *websocket.Conn, cfg WebSocketTransportConfig) error {
+	if l.Session == nil {
+		return ErrSessionNotConfigured
+	}
+	maxPayload := cfg.MaxPayload
+	if maxPayload <= 0 {
+		maxPayload = DefaultMaxPayload
+	}
+	writeTimeout := cfg.WriteTimeout
+	if writeTimeout <= 0 {
+		writeTimeout = 5 * time.Second
+	}
+	conn.SetReadLimit(int64(HeaderSize + maxPayload))
+
+	for {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+
+		messageType, payload, err := conn.ReadMessage()
+		if websocket.IsCloseError(err, websocket.CloseNormalClosure, websocket.CloseGoingAway) {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		if messageType != websocket.BinaryMessage {
+			continue
+		}
+		frame, err := UnmarshalFrame(payload, maxPayload)
+		if err != nil {
+			return err
+		}
+		responses, err := l.HandleFrame(ctx, frame)
+		if err != nil {
+			return err
+		}
+		for _, response := range responses {
+			encoded, err := MarshalFrame(response)
+			if err != nil {
+				return err
+			}
+			if err := conn.SetWriteDeadline(time.Now().Add(writeTimeout)); err != nil {
+				return err
+			}
+			if err := conn.WriteMessage(websocket.BinaryMessage, encoded); err != nil {
+				return err
+			}
+		}
+	}
+}