Merge pull request #607 from mattbostock/prevent_panic

Prevent panic on failed config load

Author: fabxc

api/api.go

@@ -127,7 +127,7 @@ func (api *API) Register(r *route.Router) {
 }
 
 // Update sets the configuration string to a new value.
-func (api *API) Update(cfg string, resolveTimeout time.Duration) {
+func (api *API) Update(cfg string, resolveTimeout time.Duration) error {
 	api.mtx.Lock()
 	defer api.mtx.Unlock()
 
@@ -137,8 +137,11 @@ func (api *API) Update(cfg string, resolveTimeout time.Duration) {
 	configJSON, err := config.Load(cfg)
 	if err != nil {
 		log.Errorf("error: %v", err)
+		return err
 	}
+
 	api.configJSON = *configJSON
+	return nil
 }
 
 type errorType string

cmd/alertmanager/main.go

@@ -208,7 +208,10 @@ func main() {
 			return err
 		}
 
-		apiv.Update(conf.String(), time.Duration(conf.Global.ResolveTimeout))
+		err = apiv.Update(conf.String(), time.Duration(conf.Global.ResolveTimeout))
+		if err != nil {
+			return err
+		}
 
 		tmpl, err = template.FromGlobs(conf.Templates...)
 		if err != nil {