deal uncached prepare qps

capture/const.go

@@ -1 +1,3 @@
-package capture
+package capture
+
+const checkCount  =  30

capture/network.go

@@ -106,20 +106,22 @@ func (nc *networkCard) Listen() (receiver chan model.QueryPiece) {
 // Listen get a connection.
 func (nc *networkCard) listenNormal() {
 	go func() {
+		aliveCounter := 0
 		handler := initEthernetHandlerFromPacpgo()
 		for {
 			var data []byte
-			data, ci, err := handler.ZeroCopyReadPacketData()
-			if err != nil {
-				log.Error(err.Error())
-				time.Sleep(time.Second*3)
-				continue
-			}
+			var ci gopacket.CaptureInfo
+			var err error
 
 			// capture packets according to a certain probability
 			capturePacketRate := communicator.GetTCPCapturePacketRate()
 			if capturePacketRate <= 0 {
-				time.Sleep(time.Second*3)
+				time.Sleep(time.Second*1)
+				aliveCounter += 1
+				if aliveCounter >= checkCount {
+					aliveCounter = 0
+					nc.receiver <- model.NewBaseQueryPiece(localIPAddr, nc.listenPort, capturePacketRate)
+				}
 				continue
 
 			} else if 0 < capturePacketRate && capturePacketRate < 1.0 {
@@ -130,6 +132,14 @@ func (nc *networkCard) listenNormal() {
 				}
 			}
 
+			aliveCounter = 0
+			data, ci, err = handler.ZeroCopyReadPacketData()
+			if err != nil {
+				log.Error(err.Error())
+				time.Sleep(time.Second*3)
+				continue
+			}
+
 			packet := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.NoCopy)
 			m := packet.Metadata()
 			m.CaptureInfo = ci