From 7e8ce30b87ef1083e270d95f05147098bcdedeb0 Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Sat, 2 Dec 2023 11:53:46 +0100
Subject: [PATCH] app/app.go: in NewApp() return error if lookup services can't
 be found.

---
 app/app.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/app/app.go b/app/app.go
index 0e499bc..2c04470 100644
--- a/app/app.go
+++ b/app/app.go
@@ -1,6 +1,7 @@
 package app
 
 import (
+	"fmt"
 	"net"
 
 	"dnsupdater/provider/manager"
@@ -29,6 +30,10 @@ func NewApp(config *Config) (*App, error) {
 
 	l := resolver.Get(config.Services.IPLookup)
 
+	if l == nil {
+		return nil, fmt.Errorf("Failed to load lookup service: %s", config.Services.IPLookup)
+	}
+
 	return &App{
 		ProviderManager: providerMgr,
 		IPLookupService: resolver.Get(config.Services.IPLookup),