Refactor settings handling to support context-based reloading and add utility functions for context management

internal/settings/context.go

@@ -0,0 +1,28 @@
+package settings
+
+import "context"
+
+type reloadedContextKey struct{}
+
+// MarkReloadedInContext marks that a given Settings instance has been refreshed in this context flow.
+func MarkReloadedInContext(ctx context.Context, cfg *Settings) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if cfg == nil {
+		return ctx
+	}
+	return context.WithValue(ctx, reloadedContextKey{}, cfg)
+}
+
+// IsReloadedInContext reports whether this context flow already refreshed the provided Settings.
+func IsReloadedInContext(ctx context.Context, cfg *Settings) bool {
+	if ctx == nil || cfg == nil {
+		return false
+	}
+	marked, ok := ctx.Value(reloadedContextKey{}).(*Settings)
+	if !ok || marked == nil {
+		return false
+	}
+	return marked == cfg
+}