mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-15 17:51:03 +00:00
91 lines
1.6 KiB
Go
91 lines
1.6 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2024 ArangoDB GmbH, Cologne, Germany
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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package util
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import (
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"sync"
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"k8s.io/apimachinery/pkg/util/yaml"
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)
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type Loader[T any] interface {
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MustGet() T
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Get() (T, error)
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}
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type LoaderGen[T any] func() (T, error)
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type loader[T any] struct {
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lock sync.Mutex
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gen LoaderGen[T]
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object T
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generated bool
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}
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func (l *loader[T]) MustGet() T {
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obj, err := l.Get()
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if err != nil {
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panic(err.Error())
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}
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return obj
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}
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func (l *loader[T]) Get() (T, error) {
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l.lock.Lock()
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defer l.lock.Unlock()
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if l.generated {
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return l.object, nil
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}
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obj, err := l.gen()
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if err != nil {
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return Default[T](), err
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}
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l.generated = true
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l.object = obj
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return l.object, nil
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}
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func NewLoader[T any](gen LoaderGen[T]) Loader[T] {
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return &loader[T]{
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gen: gen,
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}
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}
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func NewYamlLoader[T any](data []byte) Loader[T] {
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return NewLoader[T](func() (T, error) {
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var obj T
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if err := yaml.Unmarshal(data, &obj); err != nil {
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return Default[T](), err
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}
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return obj, nil
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})
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}
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