implement SOA serial bump and DNS slave server notify

pkg/api/api.go

@@ -15,10 +15,11 @@ import (
 )
 
 type AcmednsAPI struct {
-	Config  *acmedns.AcmeDnsConfig
-	DB      acmedns.AcmednsDB
-	Logger  *zap.SugaredLogger
-	errChan chan error
+	Config     *acmedns.AcmeDnsConfig
+	DB         acmedns.AcmednsDB
+	Logger     *zap.SugaredLogger
+	errChan    chan error
+	dnsServers []acmedns.AcmednsNS
 }
 
 func Init(config *acmedns.AcmeDnsConfig, db acmedns.AcmednsDB, logger *zap.SugaredLogger, errChan chan error) AcmednsAPI {
@@ -27,6 +28,8 @@ func Init(config *acmedns.AcmeDnsConfig, db acmedns.AcmednsDB, logger *zap.Sugar
 }
 
 func (a *AcmednsAPI) Start(dnsservers []acmedns.AcmednsNS) {
+	//we need the dnsservers later to bump serial
+	a.dnsServers = dnsservers
 	var err error
 	//TODO: do we want to debug log the HTTP server?
 	stderrorlog, err := zap.NewStdLogAt(a.Logger.Desugar(), zap.ErrorLevel)

pkg/api/update.go

@@ -49,6 +49,10 @@ func (a *AcmednsAPI) webUpdatePost(w http.ResponseWriter, r *http.Request, _ htt
 			upd = []byte("{\"txt\": \"" + atxt.Value + "\"}")
 		}
 	}
+	for _, s := range a.dnsServers {
+		//bump SOA serial on update (and notify slaves if configured)
+		s.BumpSerial()
+	}
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(updStatus)
 	_, _ = w.Write(upd)