frostfs-contract/commonclient/iterator.go

50 lines
1.3 KiB
Go
Raw Normal View History

package commonclient
import (
"fmt"
"github.com/google/uuid"
"github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"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")
}
script, err := smartcontract.CreateCallAndPrefetchIteratorScript(contract, method, batchSize, params...)
if err != nil {
return nil, fmt.Errorf("couldn't create unwrap script: %w", err)
}
arr, sessionID, iter, err := unwrap.ArrayAndSessionIterator(inv.Run(script))
if err != nil {
return nil, fmt.Errorf("unwrap session iterator: %w", err)
}
if (sessionID == uuid.UUID{}) {
return arr, nil
}
defer func() {
_ = inv.TerminateSession(sessionID)
}()
var shouldStop bool
res := arr
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
}