/
utility_delay.go
73 lines (57 loc) · 1.54 KB
/
utility_delay.go
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package transform
import (
"context"
"encoding/json"
"fmt"
"time"
"github.com/brexhq/substation/config"
iconfig "github.com/brexhq/substation/internal/config"
"github.com/brexhq/substation/internal/errors"
"github.com/brexhq/substation/message"
)
type utilityDelayConfig struct {
// Duration is the amount of time to delay.
Duration string `json:"duration"`
}
func (c *utilityDelayConfig) Decode(in interface{}) error {
return iconfig.Decode(in, c)
}
func (c *utilityDelayConfig) Validate() error {
if c.Duration == "" {
return fmt.Errorf("duration: %v", errors.ErrMissingRequiredOption)
}
return nil
}
func newUtilityDelay(_ context.Context, cfg config.Config) (*utilityDelay, error) {
conf := utilityDelayConfig{}
if err := conf.Decode(cfg.Settings); err != nil {
return nil, fmt.Errorf("transform: utility_delay: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: utility_delay: %v", err)
}
dur, err := time.ParseDuration(conf.Duration)
if err != nil {
return nil, fmt.Errorf("transform: utility_delay: duration: %v", err)
}
tf := utilityDelay{
conf: conf,
dur: dur,
}
return &tf, nil
}
type utilityDelay struct {
conf utilityDelayConfig
dur time.Duration
}
func (tf *utilityDelay) Transform(_ context.Context, msg *message.Message) ([]*message.Message, error) {
if msg.IsControl() {
return []*message.Message{msg}, nil
}
time.Sleep(tf.dur)
return []*message.Message{msg}, nil
}
func (tf *utilityDelay) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}