[#199] putsvc: Refactor put object

Resolve containedctx linter for streamer and remote target

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/object_manager/transformer/writer.go

@@ -0,0 +1,52 @@
+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}
+}