feat: add interval between DNS updates

cmd/simple-ddns-client/main.go

@@ -22,6 +22,7 @@ import (
 	"context"
 	"encoding/json"
 	"flag"
+	"fmt"
 	"io"
 	"log"
 	"net"
@@ -184,8 +185,16 @@ func init() {
 	flag.Parse()
 
 	config = loadConfig(configPath)
+
+	if config.UpdateInterval <= 0 {
+		log.Fatal("\"updateInterval\" has to be greater than 0")
+	}
 }
 
 func main() {
-	config.updateIp()
+	for {
+		config.updateIp()
+		log.Print("Sleeping for " + fmt.Sprint(config.UpdateInterval) + " seconds")
+		time.Sleep(time.Duration(config.UpdateInterval) * time.Second)
+	}
 }

config.json.example

@@ -1,5 +1,5 @@
 {
-	"interval:": 60,
+	"updateInterval": 60,
 	"dnsServer": "1.1.1.1:53",
 	"provider": "porkbun",
 	"porkbun": {