add notification when ip changes

cli/Dockerfile

@@ -5,4 +5,4 @@ WORKDIR /app
 RUN go build -o infra_cli .
 RUN adduser -S -D -H -h /app appuser
 USER appuser
-CMD ["./main"]
+CMD ["./infra_cli", "-h"]

cli/main.go

@@ -180,6 +180,11 @@ func run() error {
 			glog.Infof("IPs of dyndns and current ip match, nothing to do: current=%s, dyndns=%s", currIP, newIP)
 			return nil
 		}
+		// Send notification as glue records can't be modified programatically for godaddy :/
+		err = notifyForIPChange(currIP, newIP)
+		if err != nil {
+			return errors.Wrapf(err, "failed to notify for ip change. this must succeed otherwise the glue records won't be updated")
+		}
 		// setup git repo
 		gitFs, err := NewGitFS(repository)
 		if err != nil {

cli/update_viktorbarzin_me.go

@@ -1,12 +1,15 @@
 package main
 
 import (
+	"bytes"
 	"fmt"
 	"io/ioutil"
 	"net"
+	"net/http"
 	"os"
 	"strings"
 
+	"github.com/golang/glog"
 	"github.com/pkg/errors"
 )
 
@@ -73,3 +76,30 @@ func getNewContent(gitFs *GitFS, currIp, newIp net.IP) (string, error) {
 	}
 	return strings.Join(newLines, "\n"), nil
 }
+
+func notifyForIPChange(oldIP, newIP net.IP) error {
+	// Notify if dyndns ip is different to public
+	// Currently send a message to Viktor via the webhook handler
+	const url = "https://webhook.viktorbarzin.me/fb/message-viktor"
+	body := []byte(fmt.Sprintf("Public IP (%s) is different than dynamic dns IP (%s)", oldIP.String(), newIP.String()))
+
+	// Send the HTTP request
+	resp, err := http.Post(url, "application/json", bytes.NewBuffer(body))
+	if err != nil {
+		return errors.Wrapf(err, "Error sending request")
+	}
+	defer resp.Body.Close()
+
+	// Check the response status code
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("Request failed. Status code: %d", resp.StatusCode)
+	}
+
+	// Read the response body
+	responseBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return errors.Wrapf(err, "Error reading response")
+	}
+	glog.Infof("Response:", string(responseBody))
+	return nil
+}