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main.go
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main.go
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package main
import (
"encoding/json"
"flag"
"github.com/ghodss/yaml"
"io/ioutil"
"k8s.io/api/apps/v1"
batchv1 "k8s.io/api/batch/v1"
coreV1 "k8s.io/api/core/v1"
"strings"
//"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"log"
"os"
)
type tool struct {
Data *[]byte // 源数据
Kind string // 数据源的格式
Type string // 指定输出格式 json|yaml
Command []string // debug 命令行,用于阻塞pod退出
Suffix string // 后缀
transformer
}
type Deploy struct {
Meta *v1.Deployment
}
type StatefulSet struct {
Meta *v1.StatefulSet
}
type Job struct {
Meta *batchv1.Job
}
type Pod struct {
Meta *coreV1.Pod
}
type transformer interface {
Read(b *[]byte)
Replace(cmd []string, suffix string) (v interface{})
}
func (d *Deploy) Read(b *[]byte) {
var data v1.Deployment
err := json.Unmarshal(*b, &data)
if err != nil {
log.Fatal(err)
}
d.Meta = &data
}
func (d *Deploy) Replace(cmd []string, suffix string) (v interface{}) {
d.Meta.Name = d.Meta.Name + suffix
d.Meta.Status = v1.DeploymentStatus{}
d.Meta.Spec.Template.Name = d.Meta.Spec.Template.Name + suffix
containers := d.Meta.Spec.Template.Spec.Containers
if len(containers) == 0 {
log.Fatal("Containers 长度异常")
}
container := containers[0]
container.Command = cmd
container.ReadinessProbe = nil
container.LivenessProbe = nil
container.Lifecycle = nil
d.Meta.Spec.Template.Spec.Containers[0] = container
return d.Meta
}
func (s *StatefulSet) Read(b *[]byte) {
var data v1.StatefulSet
err := json.Unmarshal(*b, &data)
if err != nil {
log.Fatal(err)
}
s.Meta = &data
}
func (s *StatefulSet) Replace(cmd []string, suffix string) (v interface{}) {
s.Meta.Name = s.Meta.Name + suffix
s.Meta.Status = v1.StatefulSetStatus{}
s.Meta.Spec.Template.Name = s.Meta.Spec.Template.Name + suffix
containers := s.Meta.Spec.Template.Spec.Containers
if len(containers) == 0 {
log.Fatal("Containers 长度异常")
}
container := containers[0]
container.Command = cmd
container.ReadinessProbe = nil
container.LivenessProbe = nil
container.Lifecycle = nil
s.Meta.Spec.Template.Spec.Containers[0] = container
return s.Meta
}
func (j *Job) Read(b *[]byte) {
var data batchv1.Job
err := json.Unmarshal(*b, &data)
if err != nil {
log.Fatal(err)
}
j.Meta = &data
}
func (j *Job) Replace(cmd []string, suffix string) (v interface{}) {
j.Meta.Name = j.Meta.Name + suffix
j.Meta.Status = batchv1.JobStatus{}
j.Meta.Spec.Template.Name = j.Meta.Spec.Template.Name + suffix
containers := j.Meta.Spec.Template.Spec.Containers
if len(containers) == 0 {
log.Fatal("Containers 长度异常")
}
container := containers[0]
container.Command = cmd
container.ReadinessProbe = nil
container.LivenessProbe = nil
container.Lifecycle = nil
j.Meta.Spec.Template.Spec.Containers[0] = container
return j.Meta
}
func (p *Pod) Read(b *[]byte) {
var data coreV1.Pod
err := json.Unmarshal(*b, &data)
if err != nil {
log.Fatal(err)
}
p.Meta = &data
}
func (p *Pod) Replace(cmd []string, suffix string) (v interface{}) {
p.Meta.Name = p.Meta.Name + suffix
p.Meta.Status = coreV1.PodStatus{}
p.Meta.OwnerReferences = nil
p.Meta.Spec.NodeName = ""
containers := p.Meta.Spec.Containers
if len(containers) == 0 {
log.Fatal("Containers 长度异常")
}
container := containers[0]
container.Command = cmd
container.ReadinessProbe = nil
container.LivenessProbe = nil
container.Lifecycle = nil
p.Meta.Spec.Containers[0] = container
return p.Meta
}
func readPipeline() *[]byte {
stdinInfo, _ := os.Stdin.Stat()
if (stdinInfo.Mode() & os.ModeNamedPipe) != os.ModeNamedPipe {
log.Fatal("读取方式不是控制台输入")
}
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal("读取控制台输入异常:", err)
}
return &data
}
func readFile(path string) *[]byte {
f, err := ioutil.ReadFile(path)
if err != nil {
log.Fatal("文件读取异常:", err.Error())
}
return &f
}
func handleFlag() *tool {
var operation string
var cmd string
var filepath string
var suffix string
flag.StringVar(&filepath, "f", "-", "默认从控制台读入数据,亦可指定文件")
flag.StringVar(&operation, "t", "json", "输出格式,默认为json,可设定为yaml")
flag.StringVar(&suffix, "s", "-copy", "后缀名,用于区别原文件中的资源名字")
flag.StringVar(&cmd, "c", "sh -c /usr/sbin/sshd -D & touch debug && tail -f debug", "阻塞pod退出的命令")
flag.Parse()
t := new(tool)
if filepath == "-" {
t.Data = readPipeline()
} else {
t.Data = readFile(filepath)
}
t.Command = cmd2Cmds(cmd)
t.Type = operation
t.Suffix = suffix
t.checkKind()
return t
}
func (t *tool) checkKind() {
// 可以通过官方库获取类型
//us:=unstructured.Unstructured{}
//us.GetKind()
var data map[string]interface{}
t.Kind = getKind(t.Data)
if t.Kind != "" {
return
}
err := yaml.Unmarshal(*t.Data, &data)
if err != nil {
log.Fatal("尝试yaml解析失败...", err)
}
b, err := yaml.YAMLToJSON(*t.Data)
if err != nil {
log.Fatal("尝试yaml转json失败...", err)
}
t.Data = &b
t.Kind = getKind(&b)
}
func getKind(b *[]byte) string {
var data map[string]interface{}
if json.Valid(*b) {
err := json.Unmarshal(*b, &data)
if err != nil {
log.Fatal("尝试json解析失败...", err)
}
if kind, ok := data["kind"]; !ok {
log.Fatal("kind not found")
} else {
return kind.(string)
}
}
return ""
}
func cmd2Cmds(cmd string) []string {
cmds := []string{"/bin/bash", "-c", cmd}
return cmds
}
func (t *tool) write(v interface{}) {
var data []byte
var err error
if strings.ToLower(t.Type) == "json" {
data, err = json.Marshal(v)
if err != nil {
log.Fatal("结果转换为json格式失败", err)
}
} else if strings.ToLower(t.Type) == "yaml" {
data, err = yaml.Marshal(v)
if err != nil {
log.Fatal("结果转换为yaml格式失败", err)
}
}
if len(data) == 0 {
log.Fatal("转换失败")
}
os.Stdout.Write(data)
}
func main() {
// 读取cmd
t := handleFlag()
// 策略模式
switch t.Kind {
case "Pod":
t.transformer = new(Pod)
case "StatefulSet":
t.transformer = new(StatefulSet)
case "Deployment":
t.transformer = new(Deploy)
case "Job":
t.transformer = new(Job)
default:
log.Fatalf("%s 类型无对应实现", t.Kind)
}
t.Read(t.Data)
v := t.Replace(t.Command, t.Suffix)
// 输出结果和报错
t.write(v)
}
/*
- 实现从shell管道中读取json/yaml并转换
- 发生错误时直接log.Fatal退出程序
*/