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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package configfiles
import (
"fmt"
"path/filepath"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
kubeletscheme "k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig/scheme"
utilcodec "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/codec"
utilfs "k8s.io/kubernetes/pkg/util/filesystem"
)
const kubeletFile = "kubelet"
// Loader loads configuration from a storage layer
type Loader interface {
// Load loads and returns the KubeletConfiguration from the storage layer, or an error if a configuration could not be loaded
Load() (*kubeletconfig.KubeletConfiguration, error)
}
// fsLoader loads configuration from `configDir`
type fsLoader struct {
// fs is the filesystem where the config files exist; can be mocked for testing
fs utilfs.Filesystem
// kubeletCodecs is the scheme used to decode config files
kubeletCodecs *serializer.CodecFactory
// configDir is the absolute path to the directory containing the configuration files
configDir string
}
// NewFsLoader returns a Loader that loads a KubeletConfiguration from the files in `configDir`
func NewFsLoader(fs utilfs.Filesystem, configDir string) (Loader, error) {
_, kubeletCodecs, err := kubeletscheme.NewSchemeAndCodecs()
if err != nil {
return nil, err
}
return &fsLoader{
fs: fs,
kubeletCodecs: kubeletCodecs,
configDir: configDir,
}, nil
}
func (loader *fsLoader) Load() (*kubeletconfig.KubeletConfiguration, error) {
// require the config be in a file called "kubelet"
path := filepath.Join(loader.configDir, kubeletFile)
data, err := loader.fs.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("failed to read init config file %q, error: %v", path, err)
}
// no configuration is an error, some parameters are required
if len(data) == 0 {
return nil, fmt.Errorf("init config file %q was empty, but some parameters are required", path)
}
return utilcodec.DecodeKubeletConfiguration(loader.kubeletCodecs, data)
}
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