Merge pull request #709 from Darkren/feature/vpn-redial-backoff

Add exponential backoff for VPN client reconnection

internal/vpn/client.go

@@ -188,18 +188,25 @@ func (c *Client) Serve() error {
 
 	c.setAppStatus(ClientStatusConnecting)
 
-	for {
-		if err := c.dialServeConn(); err != nil {
-			fmt.Printf("dialServeConn: %v\n", err)
-		}
-
+	r := netutil.NewDefaultRetrier(c.log)
+	err := r.Do(context.Background(), func() error {
 		if c.isClosed() {
 			return nil
 		}
 
-		c.setAppStatus(ClientStatusReconnecting)
-		fmt.Println("Connection broke, reconnecting...")
+		if err := c.dialServeConn(); err != nil {
+			c.setAppStatus(ClientStatusReconnecting)
+			fmt.Println("Connection broke, reconnecting...")
+			return fmt.Errorf("dialServeConn: %w", err)
+		}
+
+		return nil
+	})
+	if err != nil {
+		return fmt.Errorf("failed to connect to the server: %w", err)
 	}
+
+	return nil
 }
 
 // Close closes client.