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configfiles.go
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configfiles.go
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/*
* Tencent is pleased to support the open source community by making TKEStack
* available.
*
* Copyright (C) 2012-2019 Tencent. All Rights Reserved.
*
* 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
*
* https://opensource.org/licenses/Apache-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 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"
monitorconfig "tkestack.io/tke/pkg/monitor/apis/config"
monitorscheme "tkestack.io/tke/pkg/monitor/apis/config/scheme"
"tkestack.io/tke/pkg/monitor/config/codec"
utilfs "tkestack.io/tke/pkg/util/filesystem"
)
// Loader loads configuration from a storage layer
type Loader interface {
// Load loads and returns the MonitorConfiguration from the storage layer, or an error if a configuration could not be loaded
Load() (*monitorconfig.MonitorConfiguration, 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
// monitorCodecs is the scheme used to decode config files
monitorCodecs *serializer.CodecFactory
// monitorFile is an absolute path to the file containing a serialized MonitorConfiguration
monitorFile string
}
// NewFsLoader returns a Loader that loads a MonitorConfiguration from the `monitorFile`
func NewFsLoader(fs utilfs.Filesystem, monitorFile string) (Loader, error) {
_, monitorCodecs, err := monitorscheme.NewSchemeAndCodecs()
if err != nil {
return nil, err
}
return &fsLoader{
fs: fs,
monitorCodecs: monitorCodecs,
monitorFile: monitorFile,
}, nil
}
func (loader *fsLoader) Load() (*monitorconfig.MonitorConfiguration, error) {
data, err := loader.fs.ReadFile(loader.monitorFile)
if err != nil {
return nil, fmt.Errorf("failed to read kubelet config file %q, error: %v", loader.monitorFile, err)
}
// no configuration is an error, some parameters are required
if len(data) == 0 {
return nil, fmt.Errorf("kubelet config file %q was empty", loader.monitorFile)
}
kc, err := codec.DecodeMonitorConfiguration(loader.monitorCodecs, data)
if err != nil {
return nil, err
}
// make all paths absolute
resolveRelativePaths(monitorconfig.MonitorConfigurationPathRefs(kc), filepath.Dir(loader.monitorFile))
return kc, nil
}
// resolveRelativePaths makes relative paths absolute by resolving them against `root`
func resolveRelativePaths(paths []*string, root string) {
for _, path := range paths {
// leave empty paths alone, "no path" is a valid input
// do not attempt to resolve paths that are already absolute
if len(*path) > 0 && !filepath.IsAbs(*path) {
*path = filepath.Join(root, *path)
}
}
}