Add the event service

schema/ent/hook/hook.go

@@ -9,6 +9,18 @@ import (
 	"git.gorlug.de/code/ersteller/schema/ent"
 )
 
+// The EventFunc type is an adapter to allow the use of ordinary
+// function as Event mutator.
+type EventFunc func(context.Context, *ent.EventMutation) (ent.Value, error)
+
+// Mutate calls f(ctx, m).
+func (f EventFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
+	if mv, ok := m.(*ent.EventMutation); ok {
+		return f(ctx, mv)
+	}
+	return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.EventMutation", m)
+}
+
 // The GeneralQueueFunc type is an adapter to allow the use of ordinary
 // function as GeneralQueue mutator.
 type GeneralQueueFunc func(context.Context, *ent.GeneralQueueMutation) (ent.Value, error)