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annotations.go
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annotations.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 recorder
import (
"encoding"
"encoding/json"
"reflect"
"strconv"
"github.com/iancoleman/strcase"
"github.com/pkg/errors"
)
var ErrInvalidType = errors.New("invalid type of fields")
var ErrUknownType = errors.New("uknown type of fields")
var annotationPrefix = "chaos-mesh.org/"
func generateAnnotations(e ChaosEvent) (map[string]string, error) {
annotations := make(map[string]string)
if e == nil {
return annotations, nil
}
val := reflect.ValueOf(e)
val = reflect.Indirect(val)
for index := 0; index < val.NumField(); index++ {
fieldName := val.Type().Field(index).Name
key := annotationPrefix + strcase.ToKebab(fieldName)
field := val.Field(index)
switch field.Kind() {
case reflect.Invalid:
return nil, ErrInvalidType
case reflect.String:
annotations[key] = field.String()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
annotations[key] = strconv.Itoa(int(field.Int()))
default:
if marshaler, ok := field.Interface().(encoding.TextMarshaler); ok {
text, err := marshaler.MarshalText()
if err != nil {
return nil, err
}
annotations[key] = string(text)
} else {
text, err := json.Marshal(field.Interface())
if err != nil {
return nil, err
}
annotations[key] = string(text)
}
}
}
annotations[annotationPrefix+"type"] = strcase.ToKebab(val.Type().Name())
return annotations, nil
}
// FromAnnotations will iterate over all the registered event,
// return `nil` if there is no suitable event.
func FromAnnotations(annotations map[string]string) (ChaosEvent, error) {
typeName := annotations[annotationPrefix+"type"]
ev := allEvents[typeName]
if ev == nil {
return nil, ErrUknownType
}
val := reflect.ValueOf(ev)
val = reflect.Indirect(val)
newEmptyValue := reflect.Indirect(reflect.New(val.Type()))
for index := 0; index < newEmptyValue.NumField(); index++ {
fieldName := newEmptyValue.Type().Field(index).Name
key := annotationPrefix + strcase.ToKebab(fieldName)
field := newEmptyValue.Field(index)
switch field.Kind() {
case reflect.Invalid:
return nil, ErrInvalidType
case reflect.String:
field.SetString(annotations[key])
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
num, err := strconv.Atoi(annotations[key])
if err != nil {
return nil, err
}
field.SetInt(int64(num))
default:
if unmarshaler, ok := field.Interface().(encoding.TextUnmarshaler); ok {
err := unmarshaler.UnmarshalText([]byte(annotations[key]))
if err != nil {
return nil, err
}
} else if unmarshaler, ok := field.Addr().Interface().(encoding.TextUnmarshaler); ok {
err := unmarshaler.UnmarshalText([]byte(annotations[key]))
if err != nil {
return nil, err
}
} else {
err := json.Unmarshal([]byte(annotations[key]), field.Addr().Interface())
if err != nil {
return nil, err
}
}
}
}
return newEmptyValue.Interface().(ChaosEvent), nil
}