added comments for future solution

pkg/morph/client/container/containers_of.go

@@ -22,7 +22,17 @@ func (c *Client) ContainersOf(idUser *user.ID) ([]cid.ID, error) {
 		rawID = idUser.WalletBytes()
 	}
 
+	// We would like to have batch size as big as possible,
+	// to reduce the number of round-trips and avoid creating sessions.
+	// The limit depends on 2 things:
+	// 1. VM limits: max 2048 items on stack.
+	// 2. JSON encoded size for the item with type = 128k.
+	// It turns out, that for container ID the second limit is hit first,
+	// 512 is big enough value and it is beautiful.
+	const batchSize = 512
+
 	var cidList []cid.ID
+	wasSent := false
 	cb := func(item stackitem.Item) error {
 		rawID, err := client.BytesFromStackItem(item)
 		if err != nil {
@@ -37,26 +47,26 @@ func (c *Client) ContainersOf(idUser *user.ID) ([]cid.ID, error) {
 		}
 
 		cidList = append(cidList, id)
+		if len(cidList) == batchSize { // that's wrong check, need to fix
+			wasSent = true
+			// do send() and return
+		}
+		wasSent = false
 		return nil
 	}
 
-	// We would like to have batch size as big as possible,
-	// to reduce the number of round-trips and avoid creating sessions.
-	// The limit depends on 2 things:
-	// 1. VM limits: max 2048 items on stack.
-	// 2. JSON encoded size for the item with type = 128k.
-	// It turns out, that for container ID the second limit is hit first,
-	// 512 is big enough value and it is beautiful.
-	const batchSize = 512
-
 	cnrHash := c.client.ContractAddress()
 	err := c.client.Morph().TestInvokeIterator(cb, batchSize, cnrHash, containersOfMethod, rawID)
 	if err != nil {
 		if errors.Is(err, unwrap.ErrNoSessionID) {
-			return c.list(idUser)
+			return c.list(idUser) // <- here it returns the WHOLE list, need to break in batches n send()
 		}
 		return nil, err
 	}
 
+	if !wasSent {
+		// do send() the rest
+	}
+
 	return cidList, nil
 }