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string_to_snake.go
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/
string_to_snake.go
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package transform
import (
"context"
"encoding/json"
"fmt"
"github.com/brexhq/substation/config"
"github.com/brexhq/substation/message"
"github.com/iancoleman/strcase"
)
func newStringToSnake(_ context.Context, cfg config.Config) (*stringToSnake, error) {
conf := strCaseConfig{}
if err := conf.Decode(cfg.Settings); err != nil {
return nil, fmt.Errorf("transform: string_to_snake: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: string_to_snake: %v", err)
}
tf := stringToSnake{
conf: conf,
isObject: conf.Object.SourceKey != "" && conf.Object.TargetKey != "",
}
return &tf, nil
}
type stringToSnake struct {
conf strCaseConfig
isObject bool
}
func (tf *stringToSnake) Transform(ctx context.Context, msg *message.Message) ([]*message.Message, error) {
if msg.IsControl() {
return []*message.Message{msg}, nil
}
if !tf.isObject {
b := []byte(strcase.ToSnake(string(msg.Data())))
msg.SetData(b)
return []*message.Message{msg}, nil
}
value := msg.GetValue(tf.conf.Object.SourceKey)
if !value.Exists() {
return []*message.Message{msg}, nil
}
s := strcase.ToSnake(value.String())
if err := msg.SetValue(tf.conf.Object.TargetKey, s); err != nil {
return nil, fmt.Errorf("transform: string_to_snake: %v", err)
}
return []*message.Message{msg}, nil
}
func (tf *stringToSnake) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}