[#1484] neofs-cli: Print progress bar after the header has been sent

Make it similar to `object get`.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

cmd/neofs-cli/internal/client/client.go

@@ -299,6 +299,8 @@ type PutObjectPrm struct {
 	hdr *object.Object
 
 	rdr io.Reader
+
+	headerCallback func(*object.Object)
 }
 
 // SetHeader sets object header.
@@ -311,6 +313,12 @@ func (x *PutObjectPrm) SetPayloadReader(rdr io.Reader) {
 	x.rdr = rdr
 }
 
+// SetHeaderCallback sets callback which is called on the object after the header is received
+// but before the payload is written.
+func (x *PutObjectPrm) SetHeaderCallback(f func(*object.Object)) {
+	x.headerCallback = f
+}
+
 // PutObjectRes groups the resulting values of PutObject operation.
 type PutObjectRes struct {
 	id oid.ID
@@ -347,6 +355,10 @@ func PutObject(prm PutObjectPrm) (*PutObjectRes, error) {
 	wrt.WithXHeaders(prm.xHeaders...)
 
 	if wrt.WriteHeader(*prm.hdr) {
+		if prm.headerCallback != nil {
+			prm.headerCallback(prm.hdr)
+		}
+
 		sz := prm.hdr.PayloadSize()
 
 		if data := prm.hdr.Payload(); len(data) > 0 {

cmd/neofs-cli/modules/object/put.go

@@ -128,7 +128,9 @@ func putObject(cmd *cobra.Command, _ []string) {
 			p = pb.New64(fi.Size())
 			p.Output = cmd.OutOrStdout()
 			prm.SetPayloadReader(p.NewProxyReader(f))
-			p.Start()
+			prm.SetHeaderCallback(func(o *object.Object) {
+				p.Start()
+			})
 		}
 	}