69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package main
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import (
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"fmt"
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mqtt "github.com/eclipse/paho.mqtt.golang"
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"log"
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"net"
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"os"
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"time"
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)
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func getLocalIP() (string, error) {
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addrs, err := net.InterfaceAddrs()
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if err != nil {
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return "", err
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}
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for _, addr := range addrs {
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if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
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if ipnet.IP.To4() != nil {
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return ipnet.IP.String(), nil
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}
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}
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}
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return "", fmt.Errorf("no IP address found")
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}
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func publishIp(client mqtt.Client, topic string) {
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log.Printf("Publishing IP")
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ip, err := getLocalIP()
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if err != nil {
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log.Printf("Error getting IP address: %v\n", err)
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return
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}
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token := client.Publish(topic, 0, true, ip)
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token.Wait()
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if token.Error() != nil {
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log.Printf("Error publishing IP address: %v\n", token.Error())
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} else {
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log.Printf("Published IP address: %s\n", ip)
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}
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}
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func main() {
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broker := "tcp://mqtt.seeseepuff.be:1883"
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topic := "host/" + os.Getenv("SPIDER_HOSTNAME")
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opts := mqtt.NewClientOptions()
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opts.AddBroker(broker)
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opts.SetClientID("spider-host-client")
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client := mqtt.NewClient(opts)
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token := client.Connect()
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token.Wait()
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if token.Error() != nil {
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log.Fatalf("Error connecting to MQTT broker: %v\n", token.Error())
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}
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ticker := time.NewTicker(60 * time.Second)
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defer ticker.Stop()
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publishIp(client, topic)
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for {
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select {
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case <-ticker.C:
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publishIp(client, topic)
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}
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}
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}
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