map string key

main.go

@@ -39,6 +39,9 @@ func main() {
 			log.Fatalln(err)
 		}
 		routes.ParseRoutes(*UDPAddr, &rip.RIP)
-		fmt.Println(routes)
+		for _, v := range routes {
+			fmt.Printf("Route:%s\tSubnet:%s\tNexthop:%s\tMetric:%d\tTime: %v\n", v.Addr.String(), v.Subnet.String(), v.Nexthop.String(), v.Metric, v.TTL.Unix())
+		}
+		fmt.Println("")
 	}
 }

ripv2/routes/routes.go

@@ -1,13 +1,15 @@
 package routes
 
 import (
+	"crypto/sha256"
+	"fmt"
 	"net"
 	"time"
 
 	"github.com/crip/ripv2"
 )
 
-type Routes []Route
+type Routes map[string]Route
 
 type Route struct {
 	Addr    net.IP
@@ -18,12 +20,22 @@ type Route struct {
 }
 
 func New() Routes {
-	var routes Routes
+	routes := make(map[string]Route, 25)
 	return routes
 }
 
 func (r *Routes) append(route Route) {
-	*r = append(*r, route)
+	key := route.Addr.String() + route.Subnet.String() + route.Nexthop.String() + fmt.Sprintf("%d", route.Metric)
+	h := sha256.New()
+	h.Write([]byte(key))
+	bs := h.Sum(nil)
+	k, ok := (*r)[string(bs)]
+	if !ok {
+		(*r)[string(bs)] = route
+		return
+	}
+	k.TTL = time.Now()
+	(*r)[string(bs)] = k
 }
 
 func (r *Routes) ParseRoutes(addr net.UDPAddr, rip *[25]ripv2.RIP) {