internal/pipewire: generic Core::Error handling

This flushes message buffer before queueing the event expecting the error. Since this is quite useful and relatively complex, it is relocated to a method of Context.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pipewire/core.go

@@ -642,33 +642,28 @@ func (registry *Registry) destroy(id Int) error {
 }
 
 // Destroy tries to destroy the global object with id.
-func (registry *Registry) Destroy(id Int) error {
-	if err := registry.destroy(id); err != nil {
+func (registry *Registry) Destroy(id Int) (err error) {
+	asCoreError := registry.ctx.expectsCoreError(registry.ID, &err)
+	if err != nil {
+		return
+	}
+	if err = registry.destroy(id); err != nil {
 		return err
 	}
-	destroySeq := registry.ctx.currentSeq()
-
-	err := registry.ctx.GetCore().Sync()
-	if err == nil {
+	if err = registry.ctx.GetCore().Sync(); err == nil {
 		return nil
 	}
 
-	var coreError *CoreError
-	if proxyErrors, ok := err.(ProxyConsumeError); !ok ||
-		len(proxyErrors) != 1 ||
-		!errors.As(proxyErrors[0], &coreError) ||
-		coreError == nil ||
-		coreError.ID != registry.ID ||
-		coreError.Sequence != destroySeq {
-		return err
-	}
+	if coreError := asCoreError(); coreError == nil {
+		return
+	} else {
+		switch syscall.Errno(-coreError.Result) {
+		case syscall.EPERM:
+			return &PermissionError{registry.ID, coreError.Message}
 
-	switch syscall.Errno(-coreError.Result) {
-	case syscall.EPERM:
-		return &PermissionError{registry.ID, coreError.Message}
-
-	default:
-		return coreError
+		default:
+			return coreError
+		}
 	}
 }