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time_from_unix.go
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time_from_unix.go
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package transform
import (
"context"
"encoding/json"
"fmt"
"time"
"github.com/brexhq/substation/config"
"github.com/brexhq/substation/message"
)
func newTimeFromUnix(_ context.Context, cfg config.Config) (*timeFromUnix, error) {
conf := timeUnixConfig{}
if err := conf.Decode(cfg.Settings); err != nil {
return nil, fmt.Errorf("transform: time_from_unix: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: time_from_unix: %v", err)
}
tf := timeFromUnix{
conf: conf,
isObject: conf.Object.SourceKey != "" && conf.Object.TargetKey != "",
}
return &tf, nil
}
type timeFromUnix struct {
conf timeUnixConfig
isObject bool
}
func (tf *timeFromUnix) Transform(ctx context.Context, msg *message.Message) ([]*message.Message, error) {
if msg.IsControl() {
return []*message.Message{msg}, nil
}
var value message.Value
if tf.isObject {
value = msg.GetValue(tf.conf.Object.SourceKey)
} else {
value = bytesToValue(msg.Data())
}
if !value.Exists() {
return []*message.Message{msg}, nil
}
// Convert Unix to UnixNano.
date := time.Unix(value.Int(), 0)
ns := date.UnixNano()
if tf.isObject {
if err := msg.SetValue(tf.conf.Object.TargetKey, ns); err != nil {
return nil, fmt.Errorf("transform: time_from_unix: %v", err)
}
} else {
value := []byte(fmt.Sprintf("%d", ns))
msg.SetData(value)
}
return []*message.Message{msg}, nil
}
func (tf *timeFromUnix) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}