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meta_err.go
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/
meta_err.go
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package transform
import (
"context"
"encoding/json"
"fmt"
"github.com/brexhq/substation/config"
iconfig "github.com/brexhq/substation/internal/config"
"github.com/brexhq/substation/internal/errors"
"github.com/brexhq/substation/message"
)
type metaErrConfig struct {
// Transform that is applied with error handling.
Transform config.Config `json:"transform"`
}
func (c *metaErrConfig) Decode(in interface{}) error {
return iconfig.Decode(in, c)
}
func (c *metaErrConfig) Validate() error {
if c.Transform.Type == "" {
return fmt.Errorf("transform: %v", errors.ErrMissingRequiredOption)
}
return nil
}
func newMetaErr(ctx context.Context, cfg config.Config) (*metaErr, error) {
conf := metaErrConfig{}
if err := conf.Decode(cfg.Settings); err != nil {
return nil, fmt.Errorf("transform: meta_err: %v", err)
}
if err := conf.Validate(); err != nil {
return nil, fmt.Errorf("transform: meta_err: %v", err)
}
tf, err := New(ctx, conf.Transform)
if err != nil {
return nil, fmt.Errorf("transform: meta_err: %v", err)
}
meta := metaErr{
conf: conf,
tf: tf,
}
return &meta, nil
}
type metaErr struct {
conf metaErrConfig
tf Transformer
}
func (tf *metaErr) Transform(ctx context.Context, msg *message.Message) ([]*message.Message, error) {
msgs, err := tf.tf.Transform(ctx, msg)
if err != nil {
//nolint: nilerr // ignore non-nil error
return []*message.Message{msg}, nil
}
return msgs, nil
}
func (tf *metaErr) String() string {
b, _ := json.Marshal(tf.conf)
return string(b)
}