Public IP loop, fixes #186

- Uses common http client with 15 seconds timeout
- Repeats on fail after 5 seconds sleep time

cmd/gluetun/main.go

@@ -208,6 +208,7 @@ func _main(background context.Context, args []string) int {
 
 	restartOpenvpn := make(chan struct{})
 	restartUnbound := make(chan struct{})
+	restartPublicIP := make(chan struct{})
 	openvpnDone := make(chan struct{})
 	unboundDone := make(chan struct{})
 	serverDone := make(chan struct{})
@@ -220,6 +221,9 @@ func _main(background context.Context, args []string) int {
 	// wait for restartUnbound
 	go unboundLooper.Run(ctx, restartUnbound, unboundDone)
 
+	publicIPLooper := publicip.NewLooper(client, logger, fileManager, allSettings.System.IPStatusFilepath, uid, gid)
+	go publicIPLooper.Run(ctx, restartPublicIP)
+
 	go func() {
 		first := true
 		var restartTickerContext context.Context
@@ -237,7 +241,7 @@ func _main(background context.Context, args []string) int {
 				restartTickerCancel()
 				restartTickerContext, restartTickerCancel = context.WithCancel(ctx)
 				go unboundLooper.RunRestartTicker(restartTickerContext, restartUnbound)
-				onConnected(allSettings, logger, fileManager, routingConf, defaultInterface, providerConf)
+				onConnected(allSettings, logger, routingConf, defaultInterface, providerConf, restartPublicIP)
 			}
 		}
 	}()
@@ -355,10 +359,10 @@ func trimEventualProgramPrefix(s string) string {
 }
 
 func onConnected(allSettings settings.Settings,
-	logger logging.Logger, fileManager files.FileManager,
-	routingConf routing.Routing, defaultInterface string,
-	providerConf provider.Provider,
+	logger logging.Logger, routingConf routing.Routing, defaultInterface string,
+	providerConf provider.Provider, restartPublicIP chan<- struct{},
 ) {
+	restartPublicIP <- struct{}{}
 	uid, gid := allSettings.System.UID, allSettings.System.GID
 	if allSettings.OpenVPN.Provider.PortForwarding.Enabled {
 		time.AfterFunc(5*time.Second, func() {
@@ -372,22 +376,6 @@ func onConnected(allSettings settings.Settings,
 	} else {
 		logger.Info("Gateway VPN IP address: %s", vpnGatewayIP)
 	}
-	time.AfterFunc(10*time.Second, func() { // wait for Unbound to start - TODO use signal channel
-		publicIP, err := publicip.NewIPGetter(network.NewClient(3 * time.Second)).Get()
-		if err != nil {
-			logger.Error(err)
-		} else {
-			logger.Info("Public IP address is %s", publicIP)
-			err = fileManager.WriteLinesToFile(
-				string(allSettings.System.IPStatusFilepath),
-				[]string{publicIP.String()},
-				files.Ownership(uid, gid),
-				files.Permissions(0400))
-			if err != nil {
-				logger.Error(err)
-			}
-		}
-	})
 }
 
 func setupPortForwarding(logger logging.Logger, providerConf provider.Provider, filepath models.Filepath, uid, gid int) {

internal/publicip/loop.go

@@ -0,0 +1,73 @@
+package publicip
+
+import (
+	"context"
+	"time"
+
+	"github.com/qdm12/golibs/files"
+	"github.com/qdm12/golibs/logging"
+	"github.com/qdm12/golibs/network"
+	"github.com/qdm12/private-internet-access-docker/internal/models"
+)
+
+type Looper interface {
+	Run(ctx context.Context, restart <-chan struct{})
+}
+
+type looper struct {
+	getter           IPGetter
+	logger           logging.Logger
+	fileManager      files.FileManager
+	ipStatusFilepath models.Filepath
+	uid              int
+	gid              int
+}
+
+func NewLooper(client network.Client, logger logging.Logger, fileManager files.FileManager,
+	ipStatusFilepath models.Filepath, uid, gid int) Looper {
+	return &looper{
+		getter:           NewIPGetter(client),
+		logger:           logger.WithPrefix("ip getter: "),
+		fileManager:      fileManager,
+		ipStatusFilepath: ipStatusFilepath,
+		uid:              uid,
+		gid:              gid,
+	}
+}
+
+func (l *looper) logAndWait(err error) {
+	l.logger.Error(err)
+	l.logger.Info("retrying in 5 seconds")
+	time.Sleep(5 * time.Second)
+}
+
+func (l *looper) Run(ctx context.Context, restart <-chan struct{}) {
+	select {
+	case <-restart:
+	case <-ctx.Done():
+		return
+	}
+	for {
+		ip, err := l.getter.Get()
+		if err != nil {
+			l.logAndWait(err)
+			continue
+		}
+		l.logger.Info("Public IP address is %s", ip)
+		err = l.fileManager.WriteLinesToFile(
+			string(l.ipStatusFilepath),
+			[]string{ip.String()},
+			files.Ownership(l.uid, l.gid),
+			files.Permissions(0600))
+		if err != nil {
+			l.logAndWait(err)
+			continue
+		}
+		select {
+		case <-restart: // triggered restart
+		case <-ctx.Done():
+			l.logger.Warn("context canceled: exiting loop")
+			return
+		}
+	}
+}