metricshelper: improve checks for ip and transport (#2849)

Author: sukunrt

p2p/metricshelper/conn.go

@@ -5,6 +5,9 @@ import ma "github.com/multiformats/go-multiaddr"
 var transports = [...]int{ma.P_CIRCUIT, ma.P_WEBRTC, ma.P_WEBRTC_DIRECT, ma.P_WEBTRANSPORT, ma.P_QUIC, ma.P_QUIC_V1, ma.P_WSS, ma.P_WS, ma.P_TCP}
 
 func GetTransport(a ma.Multiaddr) string {
+	if a == nil {
+		return "other"
+	}
 	for _, t := range transports {
 		if _, err := a.ValueForProtocol(t); err == nil {
 			return ma.ProtocolWithCode(t).Name
@@ -15,15 +18,17 @@ func GetTransport(a ma.Multiaddr) string {
 
 func GetIPVersion(addr ma.Multiaddr) string {
 	version := "unknown"
+	if addr == nil {
+		return version
+	}
 	ma.ForEach(addr, func(c ma.Component) bool {
-		if c.Protocol().Code == ma.P_IP4 {
+		switch c.Protocol().Code {
+		case ma.P_IP4, ma.P_DNS4:
 			version = "ip4"
-			return false
-		} else if c.Protocol().Code == ma.P_IP6 {
+		case ma.P_IP6, ma.P_DNS6:
 			version = "ip6"
-			return false
 		}
-		return true
+		return false
 	})
 	return version
 }

p2p/metricshelper/conn_test.go

@@ -0,0 +1,68 @@
+package metricshelper
+
+import (
+	"fmt"
+	"testing"
+
+	ma "github.com/multiformats/go-multiaddr"
+)
+
+func TestGetTransport(t *testing.T) {
+	cases := []struct {
+		addr   ma.Multiaddr
+		result string
+	}{
+		{
+			addr:   ma.StringCast("/ip4/1.1.1.1/tcp/1"),
+			result: "tcp",
+		},
+		{
+			addr:   ma.StringCast("/ip4/1.1.1.1/udp/10"),
+			result: "other",
+		},
+		{
+			addr:   nil,
+			result: "other",
+		},
+	}
+	for i, tc := range cases {
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			got := GetTransport(tc.addr)
+			if got != tc.result {
+				t.Fatalf("invalid transport for %s\ngot:%v\nwant:%v", tc.addr, got, tc.result)
+			}
+		})
+	}
+}
+
+func TestIPVersion(t *testing.T) {
+	cases := []struct {
+		addr   ma.Multiaddr
+		result string
+	}{
+		{
+			addr:   ma.StringCast("/ip4/1.1.1.1/tcp/1"),
+			result: "ip4",
+		},
+		{
+			addr:   ma.StringCast("/ip4/1.1.1.1/udp/10"),
+			result: "ip4",
+		},
+		{
+			addr:   nil,
+			result: "unknown",
+		},
+		{
+			addr:   ma.StringCast("/dns/hello.world/tcp/10"),
+			result: "unknown",
+		},
+	}
+	for i, tc := range cases {
+		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
+			got := GetIPVersion(tc.addr)
+			if got != tc.result {
+				t.Fatalf("invalid ip version for %s\ngot:%v\nwant:%v", tc.addr, got, tc.result)
+			}
+		})
+	}
+}