为kubernetes入口对象制作注释补丁

Question

I wrote a mutating webhook for kubernetes to add default class to new ingress object.

The core part is this:

func patch( annotations map[string]string, name string) []byte {
        var patches []Patch
        if len(annotations) == 0 {
                klog.V(0).Infof("New annotation to %v.
", name)
                patchNew := Patch{"add", "/metadata/annotations", map[string]string{}}
                patches = append(patches, patchNew)
        }
        if _, ok := annotations[key]; !ok {
                klog.V(0).Infof("Added class %v to %v.
", Class, name)
                patchAdd := Patch{"add", "/metadata/annotations/" + strings.Replace(key, "/", "~1", -1), Class}
                patches = append(patches, patchAdd)
        } else {
                klog.V(0).Info("No need to add class.
")
        }
        bytes, _ := json.Marshal(patches)
        return bytes
}

It works, but it feels quite clumsy. Does this solution make sense, or is there an easier way to achieve the same result?

(I don't do much go programming, any improvements welcome.)