mirror of https://github.com/kubernetes/kops.git
113 lines
3.4 KiB
Go
113 lines
3.4 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package config
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import (
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"fmt"
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ioutil "io/ioutil"
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"sync"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"sigs.k8s.io/controller-runtime/pkg/config/v1alpha1"
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)
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// ControllerManagerConfiguration defines the functions necessary to parse a config file
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// and to configure the Options struct for the ctrl.Manager.
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type ControllerManagerConfiguration interface {
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runtime.Object
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// Complete returns the versioned configuration
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Complete() (v1alpha1.ControllerManagerConfigurationSpec, error)
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}
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// DeferredFileLoader is used to configure the decoder for loading controller
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// runtime component config types.
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type DeferredFileLoader struct {
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ControllerManagerConfiguration
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path string
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scheme *runtime.Scheme
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once sync.Once
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err error
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}
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// File will set up the deferred file loader for the configuration
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// this will also configure the defaults for the loader if nothing is
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//
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// Defaults:
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// Path: "./config.yaml"
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// Kind: GenericControllerManagerConfiguration
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func File() *DeferredFileLoader {
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scheme := runtime.NewScheme()
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utilruntime.Must(v1alpha1.AddToScheme(scheme))
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return &DeferredFileLoader{
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path: "./config.yaml",
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ControllerManagerConfiguration: &v1alpha1.ControllerManagerConfiguration{},
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scheme: scheme,
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}
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}
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// Complete will use sync.Once to set the scheme.
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func (d *DeferredFileLoader) Complete() (v1alpha1.ControllerManagerConfigurationSpec, error) {
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d.once.Do(d.loadFile)
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if d.err != nil {
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return v1alpha1.ControllerManagerConfigurationSpec{}, d.err
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}
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return d.ControllerManagerConfiguration.Complete()
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}
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// AtPath will set the path to load the file for the decoder.
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func (d *DeferredFileLoader) AtPath(path string) *DeferredFileLoader {
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d.path = path
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return d
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}
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// OfKind will set the type to be used for decoding the file into.
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func (d *DeferredFileLoader) OfKind(obj ControllerManagerConfiguration) *DeferredFileLoader {
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d.ControllerManagerConfiguration = obj
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return d
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}
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// InjectScheme will configure the scheme to be used for decoding the file.
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func (d *DeferredFileLoader) InjectScheme(scheme *runtime.Scheme) error {
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d.scheme = scheme
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return nil
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}
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// loadFile is used from the mutex.Once to load the file.
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func (d *DeferredFileLoader) loadFile() {
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if d.scheme == nil {
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d.err = fmt.Errorf("scheme not supplied to controller configuration loader")
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return
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}
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content, err := ioutil.ReadFile(d.path)
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if err != nil {
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d.err = fmt.Errorf("could not read file at %s", d.path)
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return
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}
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codecs := serializer.NewCodecFactory(d.scheme)
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// Regardless of if the bytes are of any external version,
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// it will be read successfully and converted into the internal version
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if err = runtime.DecodeInto(codecs.UniversalDecoder(), content, d.ControllerManagerConfiguration); err != nil {
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d.err = fmt.Errorf("could not decode file into runtime.Object")
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}
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}
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