/
yaml_decoder.go
60 lines (50 loc) · 1.38 KB
/
yaml_decoder.go
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package common
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/util/yaml"
)
type DecodeCallback = func(runtime.Object) error
// DecodeFile decodes the provided file data (encoded YAML documents) into Kubernetes objects using the specified scheme,
// and invokes the callback function for each decoded object. Returns an error if any decoding error occurs.
func DecodeFile(ctx context.Context, fileData []byte, scheme *runtime.Scheme, cb DecodeCallback) error {
logger, logErr := logr.FromContext(ctx)
codec := serializer.NewCodecFactory(scheme)
decoder := codec.UniversalDeserializer()
if logErr != nil {
return logErr
}
// the maximum size used to buffer a doc 5M
buf := make([]byte, 5*1024*1024)
docDecoder := yaml.NewDocumentDecoder(io.NopCloser(bytes.NewReader(fileData)))
for {
n, err := docDecoder.Read(buf)
if err != nil {
if errors.Is(io.EOF, err) {
break
}
return err
}
if n == 0 || string(fileData) == "---" {
// Skip empty docs
continue
}
docData := buf[:n]
obj, _, err := decoder.Decode(docData, nil, nil)
if err != nil {
logger.Info("Document decode error", "error", err)
return fmt.Errorf("failed to decode document: %w", err)
}
err = cb(obj)
if err != nil {
return err
}
}
return nil
}