frostfs-node/pkg/services/object_manager/transformer/writer.go

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package transformer
import (
"context"
"io"
)
type writer interface {
Write(ctx context.Context, p []byte) (n int, err error)
}
type multiWriter struct {
writers []writer
}
func (t *multiWriter) Write(ctx context.Context, p []byte) (n int, err error) {
for _, w := range t.writers {
n, err = w.Write(ctx, p)
if err != nil {
return
}
if n != len(p) {
err = io.ErrShortWrite
return
}
}
return len(p), nil
}
func newMultiWriter(writers ...writer) writer {
allWriters := make([]writer, 0, len(writers))
for _, w := range writers {
if mw, ok := w.(*multiWriter); ok {
allWriters = append(allWriters, mw.writers...)
} else {
allWriters = append(allWriters, w)
}
}
return &multiWriter{allWriters}
}
type writerWrapper struct {
Writer io.Writer
}
func (w *writerWrapper) Write(_ context.Context, p []byte) (n int, err error) {
return w.Writer.Write(p)
}
func newWriter(w io.Writer) writer {
return &writerWrapper{Writer: w}
}