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main.go
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main.go
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// Copyright 2021 Chaos Mesh 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 main
import (
"fmt"
"os"
"strings"
"gopkg.in/yaml.v2"
)
type Object struct {
ApiVersion string `yaml:"apiVersion"`
Kind string `yaml:"kind"`
Metadata yaml.MapSlice `yaml:"metadata"`
Spec yaml.MapSlice `yaml:"spec"`
}
func main() {
if len(os.Args) != 3 {
fmt.Println("migrator <old-yaml> <new-yaml>")
os.Exit(1)
}
data, err := os.ReadFile(os.Args[1])
if err != nil {
fmt.Println(err)
os.Exit(1)
}
var (
oldObj Object
newObj Object
)
err = yaml.Unmarshal(data, &oldObj)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
{
var (
schedule yaml.MapSlice
findSchedule bool
)
if isIncompatibleChaos(oldObj) {
fmt.Printf("the define of %s is changed in v2.0, please modify it according to the document, refer to https://chaos-mesh.org/docs/\n", oldObj.Kind)
os.Exit(1)
}
for _, item := range oldObj.Spec {
if item.Key == "scheduler" {
schedule = item.Value.(yaml.MapSlice)
findSchedule = true
}
}
if findSchedule {
newObj = toScheduleObject(oldObj, schedule)
} else {
newObj = oldObj
newObj.Spec = transformChaosSpec(oldObj)
}
}
data, err = yaml.Marshal(newObj)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
err = os.WriteFile(os.Args[2], data, 0644)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func getKeyName(name string) string {
s := strings.ToLower(name)
return strings.ReplaceAll(s, "chaos", "Chaos")
}
func toNewKind(kind string) string {
if kind == "IoChaos" {
return "IOChaos"
}
return kind
}
func toScheduleObject(oldObj Object, schedule yaml.MapSlice) Object {
var newObj Object
var cron string
for _, item := range schedule {
if item.Key == "cron" {
cron = item.Value.(string)
}
}
newObj.ApiVersion = oldObj.ApiVersion
newObj.Metadata = oldObj.Metadata
newObj.Kind = "Schedule"
newObj.Spec = append(newObj.Spec, yaml.MapItem{Key: "schedule", Value: cron})
newObj.Spec = append(newObj.Spec, yaml.MapItem{Key: "type", Value: toNewKind(oldObj.Kind)})
newObj.Spec = append(newObj.Spec, yaml.MapItem{Key: "historyLimit", Value: 5})
newObj.Spec = append(newObj.Spec, yaml.MapItem{Key: "concurrencyPolicy", Value: "Forbid"})
newSpec := transformChaosSpec(oldObj)
newObj.Spec = append(newObj.Spec, yaml.MapItem{Key: getKeyName(oldObj.Kind), Value: newSpec})
return newObj
}
func transformChaosSpec(obj Object) yaml.MapSlice {
var (
newSpec yaml.MapSlice
containerNames []string
)
for _, kv := range obj.Spec {
if kv.Key == "scheduler" {
continue
}
if kv.Key == "containerName" {
containerNames = append(containerNames, kv.Value.(string))
continue
}
if obj.Kind == "DNSChaos" {
// 'scope' is obsolete in v2.0, and instead with 'patterns'
// if 'scope' is 'all', means chaos applies to all the host
// so it equal to pattern "*". otherwise, can't transform.
if kv.Key == "scope" && kv.Value == "all" {
patterns := []string{"*"}
kv = yaml.MapItem{Key: "patterns", Value: patterns}
}
}
newSpec = append(newSpec, kv)
}
if len(containerNames) != 0 {
newSpec = append(newSpec, yaml.MapItem{Key: "containerNames", Value: containerNames})
}
return newSpec
}
func isIncompatibleChaos(obj Object) bool {
incompatible := false
switch obj.Kind {
case "DNSChaos":
for _, kv := range obj.Spec {
// 'scope' is obsolete in v2.0, and instead with 'patterns'
// if 'scope' is 'all', means chaos applies to all the host
// so it equal to pattern "*". otherwise, can't transform.
if kv.Key == "scope" && kv.Value != "all" {
incompatible = true
}
}
default:
}
return incompatible
}