frostfs-contract/commonclient/iterator.go

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package commonclient
import (
"fmt"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// ReadIteratorItems calls method that returns iterator and traverses the iterator until all items are read into array.
func ReadIteratorItems(inv Invoker, batchSize int, contract util.Uint160, method string, params ...any) ([]stackitem.Item, error) {
if batchSize <= 0 {
panic("batch size must be positive")
}
sessionID, iter, err := unwrap.SessionIterator(inv.Call(contract, method, params...))
if err != nil {
return nil, fmt.Errorf("unwrap session iterator: %w", err)
}
var shouldStop bool
res := make([]stackitem.Item, 0, len(iter.Values))
for !shouldStop {
items, err := inv.TraverseIterator(sessionID, &iter, batchSize)
if err != nil {
return nil, err
}
res = append(res, items...)
shouldStop = len(items) < batchSize
}
return res, nil
}