functions to get local/public IP

src/utils/ip.go

@@ -0,0 +1,39 @@
+package utils
+
+import (
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+)
+
+func PublicIP() (ip string, err error) {
+	resp, err := http.Get("https://canhazip.com")
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusOK {
+		bodyBytes, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return "", err
+		}
+		ip = strings.TrimSpace(string(bodyBytes))
+	}
+	return
+}
+
+// Get preferred outbound ip of this machine
+func LocalIP() string {
+	conn, err := net.Dial("udp", "8.8.8.8:80")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer conn.Close()
+
+	localAddr := conn.LocalAddr().(*net.UDPAddr)
+
+	return localAddr.IP.String()
+}

src/utils/ip_test.go

@@ -0,0 +1,11 @@
+package utils
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestGetIP(t *testing.T) {
+	fmt.Println(PublicIP())
+	fmt.Println(LocalIP())
+}