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transformer.go
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transformer.go
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package configurator
import (
"context"
"errors"
"github.com/alexfalkowski/go-service/marshaller"
"github.com/alexfalkowski/go-service/meta"
"github.com/alexfalkowski/konfig/provider"
)
var (
// ErrUnmarshalError in config.
ErrUnmarshalError = errors.New("unmarshal issue")
// ErrMarshalError in config.
ErrMarshalError = errors.New("marshal issue")
// ErrTraverseError in config.
ErrTraverseError = errors.New("traverse issue")
)
// Transformer for config.
type Transformer struct {
pt *provider.Transformer
f *marshaller.Factory
}
// NewTransformer for config.
func NewTransformer(pt *provider.Transformer, f *marshaller.Factory) *Transformer {
return &Transformer{pt: pt, f: f}
}
// Transform config.
func (t *Transformer) Transform(ctx context.Context, cfg *Config) ([]byte, error) {
m, err := t.f.Create(cfg.Kind)
if err != nil {
return nil, err
}
c := map[string]any{}
if err := m.Unmarshal(cfg.Data, &c); err != nil {
meta.WithAttribute(ctx, "config.unmarshal_error", err.Error())
return nil, ErrUnmarshalError
}
if err := t.traverse(ctx, c); err != nil {
meta.WithAttribute(ctx, "config.traverse_error", err.Error())
return nil, ErrTraverseError
}
data, err := m.Marshal(c)
if err != nil {
meta.WithAttribute(ctx, "config.marshal_error", err.Error())
return nil, ErrMarshalError
}
return data, nil
}
func (t *Transformer) traverse(ctx context.Context, cfg map[string]any) error {
for key, val := range cfg {
switch v := val.(type) {
case string:
vt, err := t.pt.Transform(ctx, v)
if err != nil {
return err
}
cfg[key] = vt
case map[string]any:
if err := t.traverse(ctx, v); err != nil {
return err
}
}
}
return nil
}