neoneo-go/pkg/rpc/client/helper.go

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package client
import (
"crypto/elliptic"
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/rpc/response/result"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// getInvocationError returns an error in case of bad VM state or empty stack.
func getInvocationError(result *result.Invoke) error {
if result.State != "HALT" {
return fmt.Errorf("invocation failed: %s", result.FaultException)
}
if len(result.Stack) == 0 {
return errors.New("result stack is empty")
}
return nil
}
// topBoolFromStack returns the top boolean value from stack.
func topBoolFromStack(st []stackitem.Item) (bool, error) {
index := len(st) - 1 // top stack element is last in the array
result, ok := st[index].Value().(bool)
if !ok {
return false, fmt.Errorf("invalid stack item type: %s", st[index].Type())
}
return result, nil
}
// topIntFromStack returns the top integer value from stack.
func topIntFromStack(st []stackitem.Item) (int64, error) {
index := len(st) - 1 // top stack element is last in the array
bi, err := st[index].TryInteger()
if err != nil {
return 0, err
}
return bi.Int64(), nil
}
// topPublicKeysFromStack returns the top array of public keys from stack.
func topPublicKeysFromStack(st []stackitem.Item) (keys.PublicKeys, error) {
index := len(st) - 1 // top stack element is last in the array
var (
pks keys.PublicKeys
err error
)
items, ok := st[index].Value().([]stackitem.Item)
if !ok {
return nil, fmt.Errorf("invalid stack item type: %s", st[index].Type())
}
pks = make(keys.PublicKeys, len(items))
for i, item := range items {
val, ok := item.Value().([]byte)
if !ok {
return nil, fmt.Errorf("invalid array element #%d: %s", i, item.Type())
}
pks[i], err = keys.NewPublicKeyFromBytes(val, elliptic.P256())
if err != nil {
return nil, err
}
}
return pks, nil
}
// top string from stack returns the top string from stack.
func topStringFromStack(st []stackitem.Item) (string, error) {
index := len(st) - 1 // top stack element is last in the array
bs, err := st[index].TryBytes()
if err != nil {
return "", err
}
return string(bs), nil
}
// topUint160FromStack returns the top util.Uint160 from stack.
func topUint160FromStack(st []stackitem.Item) (util.Uint160, error) {
index := len(st) - 1 // top stack element is last in the array
bs, err := st[index].TryBytes()
if err != nil {
return util.Uint160{}, err
}
return util.Uint160DecodeBytesBE(bs)
}
// topMapFromStack returns the top stackitem.Map from stack.
func topMapFromStack(st []stackitem.Item) (*stackitem.Map, error) {
index := len(st) - 1 // top stack element is last in the array
if t := st[index].Type(); t != stackitem.MapT {
return nil, fmt.Errorf("invalid return stackitem type: %s", t.String())
}
return st[index].(*stackitem.Map), nil
}
// topIterableFromStack returns top list of elements of `resultItemType` type from stack.
func topIterableFromStack(st []stackitem.Item, resultItemType interface{}) ([]interface{}, error) {
index := len(st) - 1 // top stack element is last in the array
if t := st[index].Type(); t != stackitem.InteropT {
return nil, fmt.Errorf("invalid return stackitem type: %s (InteropInterface expected)", t.String())
}
iter, ok := st[index].Value().(result.Iterator)
if !ok {
return nil, fmt.Errorf("failed to deserialize iterable from interop stackitem: invalid value type (Array expected)")
}
result := make([]interface{}, len(iter.Values))
for i := range iter.Values {
switch resultItemType.(type) {
case string:
bytes, err := iter.Values[i].TryBytes()
if err != nil {
return nil, fmt.Errorf("failed to deserialize string from stackitem #%d: %w", i, err)
}
result[i] = string(bytes)
case util.Uint160:
bytes, err := iter.Values[i].TryBytes()
if err != nil {
return nil, fmt.Errorf("failed to deserialize uint160 from stackitem #%d: %w", i, err)
}
result[i], err = util.Uint160DecodeBytesBE(bytes)
if err != nil {
return nil, fmt.Errorf("failed to decode uint160 from stackitem #%d: %w", i, err)
}
default:
return nil, errors.New("unsupported iterable type")
}
}
return result, nil
}