443d58e40a
Alpha implementation of the Dynamic Kubelet Configuration feature. See the proposal doc in #29459.
67 lines
2.2 KiB
Go
67 lines
2.2 KiB
Go
/*
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Copyright 2017 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 configfiles
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import (
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"fmt"
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"path/filepath"
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"k8s.io/kubernetes/pkg/apis/componentconfig"
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utilcodec "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/codec"
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utilfs "k8s.io/kubernetes/pkg/kubelet/kubeletconfig/util/filesystem"
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)
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// Loader loads configuration from a storage layer
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type Loader interface {
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// Load loads and returns the KubeletConfiguration from the storage layer, or an error if a configuration could not be loaded
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Load() (*componentconfig.KubeletConfiguration, error)
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}
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// fsLoader loads configuration from `configDir`
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type fsLoader struct {
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// fs is the filesystem where the config files exist; can be mocked for testing
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fs utilfs.Filesystem
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// configDir is the absolute path to the directory containing the configuration files
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configDir string
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}
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// NewFSLoader returns a Loader that loads a KubeletConfiguration from the files in `configDir`
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func NewFSLoader(fs utilfs.Filesystem, configDir string) Loader {
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return &fsLoader{
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fs: fs,
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configDir: configDir,
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}
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}
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func (loader *fsLoader) Load() (*componentconfig.KubeletConfiguration, error) {
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errfmt := fmt.Sprintf("failed to load Kubelet config files from %q, error: ", loader.configDir) + "%v"
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// require the config be in a file called "kubelet"
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path := filepath.Join(loader.configDir, "kubelet")
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data, err := loader.fs.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("failed to read init config file %q, error: %v", path, err)
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}
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// no configuration is an error, some parameters are required
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if len(data) == 0 {
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return nil, fmt.Errorf(errfmt, fmt.Errorf("config file was empty, but some parameters are required"))
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}
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return utilcodec.DecodeKubeletConfiguration(data)
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}
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