Fix zombie callback handling

httphandlers/httphandlers.go

@@ -113,7 +113,13 @@ func (p *TVPayload) callbackHandler(w http.ResponseWriter, req *http.Request) {
 	// Apparently we should ignore the first message
 	// On some media renderers we receive a STOPPED message
 	// even before we start streaming.
-	if soapcalls.GetSequence(uuid) == 0 {
+	seq, err := soapcalls.GetSequence(uuid)
+	if err != nil {
+		http.Error(w, "", 404)
+		return
+	}
+
+	if seq == 0 {
 		soapcalls.IncreaseSequence(uuid)
 		fmt.Fprintf(w, "OK\n")
 		return

soapcalls/soapcallers.go

@@ -2,6 +2,7 @@ package soapcalls
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -301,6 +302,9 @@ func IncreaseSequence(uuid string) {
 }
 
 // GetSequence .
-func GetSequence(uuid string) int {
-	return mediaRenderersStates[uuid].sequence
+func GetSequence(uuid string) (int, error) {
+	if initialMediaRenderersStates[uuid] == true {
+		return mediaRenderersStates[uuid].sequence, nil
+	}
+	return -1, errors.New("Zombie callbacks, we should ignore those")
 }