mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 13:28:18 +00:00
Paves the way for future work on more general representation of feature data and looser coupling of the data and feature source interface.
240 lines
5.5 KiB
Go
240 lines
5.5 KiB
Go
/*
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Copyright 2018-2021 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 local
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"k8s.io/klog/v2"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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const Name = "local"
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// Config
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var (
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featureFilesDir = "/etc/kubernetes/node-feature-discovery/features.d/"
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hookDir = "/etc/kubernetes/node-feature-discovery/source.d/"
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)
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// Implement FeatureSource interface
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type Source struct{}
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func (s Source) Name() string { return Name }
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// NewConfig method of the FeatureSource interface
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func (s *Source) NewConfig() source.Config { return nil }
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// GetConfig method of the FeatureSource interface
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func (s *Source) GetConfig() source.Config { return nil }
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// SetConfig method of the FeatureSource interface
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func (s *Source) SetConfig(source.Config) {}
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func (s Source) Discover() (source.Features, error) {
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featuresFromHooks, err := getFeaturesFromHooks()
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if err != nil {
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klog.Error(err)
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}
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featuresFromFiles, err := getFeaturesFromFiles()
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if err != nil {
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klog.Error(err)
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}
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// Merge features from hooks and files
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for k, v := range featuresFromHooks {
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if old, ok := featuresFromFiles[k]; ok {
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klog.Warningf("overriding label '%s': value changed from '%s' to '%s'",
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k, old, v)
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}
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featuresFromFiles[k] = v
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}
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return featuresFromFiles, nil
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}
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func parseFeatures(lines [][]byte, prefix string) source.Features {
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features := source.Features{}
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for _, line := range lines {
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if len(line) > 0 {
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lineSplit := strings.SplitN(string(line), "=", 2)
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// Check if we need to add prefix
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var key string
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if strings.Contains(lineSplit[0], "/") {
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if lineSplit[0][0] == '/' {
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key = lineSplit[0][1:]
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} else {
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key = lineSplit[0]
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}
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} else {
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key = prefix + "-" + lineSplit[0]
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}
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// Check if it's a boolean value
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if len(lineSplit) == 1 {
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features[key] = "true"
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} else {
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features[key] = lineSplit[1]
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}
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}
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}
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return features
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}
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// Run all hooks and get features
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func getFeaturesFromHooks() (source.Features, error) {
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features := source.Features{}
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files, err := ioutil.ReadDir(hookDir)
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if err != nil {
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if os.IsNotExist(err) {
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klog.Infof("hook directory %v does not exist", hookDir)
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return features, nil
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}
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return features, fmt.Errorf("unable to access %v: %v", hookDir, err)
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}
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for _, file := range files {
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fileName := file.Name()
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lines, err := runHook(fileName)
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if err != nil {
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klog.Errorf("source local failed running hook '%v': %v", fileName, err)
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continue
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}
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// Append features
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for k, v := range parseFeatures(lines, fileName) {
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if old, ok := features[k]; ok {
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klog.Warningf("overriding label '%s' from another hook (%s): value changed from '%s' to '%s'",
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k, fileName, old, v)
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}
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features[k] = v
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}
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}
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return features, nil
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}
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// Run one hook
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func runHook(file string) ([][]byte, error) {
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var lines [][]byte
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path := filepath.Join(hookDir, file)
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filestat, err := os.Stat(path)
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if err != nil {
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klog.Errorf("skipping %v, failed to get stat: %v", path, err)
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return lines, err
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}
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if filestat.Mode().IsRegular() {
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cmd := exec.Command(path)
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var stdout bytes.Buffer
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var stderr bytes.Buffer
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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// Run hook
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err = cmd.Run()
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// Forward stderr to our logger
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errLines := bytes.Split(stderr.Bytes(), []byte("\n"))
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for i, line := range errLines {
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if i == len(errLines)-1 && len(line) == 0 {
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// Don't print the last empty string
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break
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}
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klog.Errorf("%v: %s", file, line)
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}
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// Do not return any lines if an error occurred
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if err != nil {
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return lines, err
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}
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lines = bytes.Split(stdout.Bytes(), []byte("\n"))
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}
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return lines, nil
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}
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// Read all files to get features
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func getFeaturesFromFiles() (source.Features, error) {
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features := source.Features{}
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files, err := ioutil.ReadDir(featureFilesDir)
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if err != nil {
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if os.IsNotExist(err) {
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klog.Infof("features directory %v does not exist", featureFilesDir)
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return features, nil
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}
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return features, fmt.Errorf("unable to access %v: %v", featureFilesDir, err)
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}
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for _, file := range files {
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fileName := file.Name()
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lines, err := getFileContent(fileName)
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if err != nil {
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klog.Errorf("source local failed reading file '%v': %v", fileName, err)
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continue
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}
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// Append features
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for k, v := range parseFeatures(lines, fileName) {
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if old, ok := features[k]; ok {
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klog.Warningf("overriding label '%s' from another features.d file (%s): value changed from '%s' to '%s'",
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k, fileName, old, v)
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}
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features[k] = v
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}
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}
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return features, nil
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}
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// Read one file
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func getFileContent(fileName string) ([][]byte, error) {
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var lines [][]byte
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path := filepath.Join(featureFilesDir, fileName)
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filestat, err := os.Stat(path)
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if err != nil {
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klog.Errorf("skipping %v, failed to get stat: %v", path, err)
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return lines, err
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}
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if filestat.Mode().IsRegular() {
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fileContent, err := ioutil.ReadFile(path)
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// Do not return any lines if an error occurred
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if err != nil {
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return lines, err
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}
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lines = bytes.Split(fileContent, []byte("\n"))
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}
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return lines, nil
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}
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