fix: panic: send on closed channel

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

broker.go

@@ -35,8 +35,10 @@ type broker struct {
 	termMessage chan *termMessage
 	fileMessage chan *fileMessage
 	userMessage chan *usrMessage
-	cmdMessage  chan []byte
-	httpMessage chan *httpResp
+	cmdResp     chan []byte
+	cmdReq      chan *commandReq
+	httpResp    chan *httpResp
+	httpReq     chan *httpReq
 	fileProxy   sync.Map
 	devCertPool *x509.CertPool
 }
@@ -53,8 +55,10 @@ func newBroker(cfg *config.Config) *broker {
 		termMessage: make(chan *termMessage, 1000),
 		fileMessage: make(chan *fileMessage, 1000),
 		userMessage: make(chan *usrMessage, 1000),
-		cmdMessage:  make(chan []byte, 1000),
-		httpMessage: make(chan *httpResp, 1000),
+		cmdResp:     make(chan []byte, 1000),
+		cmdReq:      make(chan *commandReq, 1000),
+		httpResp:    make(chan *httpResp, 1000),
+		httpReq:     make(chan *httpReq, 1000),
 	}
 }
 
@@ -272,10 +276,20 @@ func (br *broker) run() {
 				log.Error().Msg("Not found sid: " + msg.sid)
 			}
 
-		case data := <-br.cmdMessage:
+		case req := <-br.cmdReq:
+			if dev, ok := br.devices[req.devid]; ok {
+				dev.WriteMsg(msgTypeCmd, req.data)
+			}
+
+		case data := <-br.cmdResp:
 			handleCmdResp(data)
 
-		case resp := <-br.httpMessage:
+		case req := <-br.httpReq:
+			if dev, ok := br.devices[req.devid]; ok {
+				dev.WriteMsg(msgTypeHttp, req.data)
+			}
+
+		case resp := <-br.httpResp:
 			handleHttpProxyResp(resp)
 		}
 	}

command.go

@@ -38,6 +38,8 @@ type commandInfo struct {
 type commandReq struct {
 	cancel context.CancelFunc
 	c      *gin.Context
+	devid  string
+	data   []byte
 }
 
 var commands sync.Map
@@ -68,9 +70,10 @@ func handleCmdReq(br *broker, c *gin.Context) {
 	req := &commandReq{
 		cancel: cancel,
 		c:      c,
+		devid:  devid,
 	}
 
-	dev, ok := br.devices[devid]
+	_, ok := br.devices[devid]
 	if !ok {
 		cmdErrReply(rttyCmdErrOffline, req)
 		return
@@ -108,7 +111,8 @@ func handleCmdReq(br *broker, c *gin.Context) {
 		msg = append(msg, 0)
 	}
 
-	dev.WriteMsg(msgTypeCmd, msg)
+	req.data = msg
+	br.cmdReq <- req
 
 	waitTime := commandTimeout
 

device.go

@@ -278,7 +278,7 @@ func (dev *device) readLoop() {
 				return
 			}
 
-			dev.br.cmdMessage <- b
+			dev.br.cmdResp <- b
 
 		case msgTypeHttp:
 			if msgLen < 18 {
@@ -286,7 +286,7 @@ func (dev *device) readLoop() {
 				return
 			}
 
-			dev.br.httpMessage <- &httpResp{b, dev}
+			dev.br.httpResp <- &httpResp{b, dev}
 
 		case msgTypeHeartbeat:
 			parseHeartbeat(dev, b)

http.go

@@ -24,6 +24,11 @@ type httpResp struct {
 	dev  client.Client
 }
 
+type httpReq struct {
+	devid string
+	data  []byte
+}
+
 var httpProxyCons sync.Map
 var httpProxySessions sync.Map
 
@@ -72,7 +77,8 @@ type HttpProxyWriter struct {
 	destAddr          []byte
 	srcAddr           []byte
 	hostHeaderRewrite string
-	dev               client.Client
+	br                *broker
+	devid             string
 }
 
 func (rw *HttpProxyWriter) Write(p []byte) (n int, err error) {
@@ -80,9 +86,7 @@ func (rw *HttpProxyWriter) Write(p []byte) (n int, err error) {
 	msg = append(msg, rw.destAddr...)
 	msg = append(msg, p...)
 
-	dev := rw.dev.(*device)
-
-	dev.WriteMsg(msgTypeHttp, msg)
+	rw.br.httpReq <- &httpReq{rw.devid, msg}
 
 	return len(p), nil
 }
@@ -108,7 +112,7 @@ func doHttpProxy(brk *broker, c net.Conn) {
 	}
 	devid := cookie.Value
 
-	dev, ok := brk.devices[devid]
+	_, ok := brk.devices[devid]
 	if !ok {
 		return
 	}
@@ -153,7 +157,7 @@ func doHttpProxy(brk *broker, c net.Conn) {
 		return
 	}
 
-	hpw := &HttpProxyWriter{destAddr, srcAddr, hostHeaderRewrite, dev}
+	hpw := &HttpProxyWriter{destAddr, srcAddr, hostHeaderRewrite, brk, devid}
 
 	req.Host = hostHeaderRewrite
 	hpw.WriteRequest(req)