207 lines
6.6 KiB
Go
207 lines
6.6 KiB
Go
package client
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/encoding/address"
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"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
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)
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var (
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// NeoContractHash is a hash of the NEO native contract.
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NeoContractHash, _ = util.Uint160DecodeStringLE("9bde8f209c88dd0e7ca3bf0af0f476cdd8207789")
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// GasContractHash is a hash of the GAS native contract.
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GasContractHash, _ = util.Uint160DecodeStringLE("8c23f196d8a1bfd103a9dcb1f9ccf0c611377d3b")
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)
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// NEP5Decimals invokes `decimals` NEP5 method on a specified contract.
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func (c *Client) NEP5Decimals(tokenHash util.Uint160) (int64, error) {
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result, err := c.InvokeFunction(tokenHash, "decimals", []smartcontract.Parameter{}, nil)
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if err != nil {
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return 0, err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return 0, errors.New("invalid VM state")
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}
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return topIntFromStack(result.Stack)
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}
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// NEP5Name invokes `name` NEP5 method on a specified contract.
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func (c *Client) NEP5Name(tokenHash util.Uint160) (string, error) {
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result, err := c.InvokeFunction(tokenHash, "name", []smartcontract.Parameter{}, nil)
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if err != nil {
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return "", err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return "", errors.New("invalid VM state")
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}
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return topStringFromStack(result.Stack)
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}
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// NEP5Symbol invokes `symbol` NEP5 method on a specified contract.
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func (c *Client) NEP5Symbol(tokenHash util.Uint160) (string, error) {
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result, err := c.InvokeFunction(tokenHash, "symbol", []smartcontract.Parameter{}, nil)
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if err != nil {
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return "", err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return "", errors.New("invalid VM state")
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}
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return topStringFromStack(result.Stack)
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}
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// NEP5TotalSupply invokes `totalSupply` NEP5 method on a specified contract.
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func (c *Client) NEP5TotalSupply(tokenHash util.Uint160) (int64, error) {
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result, err := c.InvokeFunction(tokenHash, "totalSupply", []smartcontract.Parameter{}, nil)
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if err != nil {
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return 0, err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return 0, errors.New("invalid VM state")
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}
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return topIntFromStack(result.Stack)
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}
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// NEP5BalanceOf invokes `balanceOf` NEP5 method on a specified contract.
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func (c *Client) NEP5BalanceOf(tokenHash util.Uint160) (int64, error) {
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result, err := c.InvokeFunction(tokenHash, "balanceOf", []smartcontract.Parameter{}, nil)
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if err != nil {
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return 0, err
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} else if result.State != "HALT" || len(result.Stack) == 0 {
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return 0, errors.New("invalid VM state")
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}
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return topIntFromStack(result.Stack)
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}
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// NEP5TokenInfo returns full NEP5 token info.
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func (c *Client) NEP5TokenInfo(tokenHash util.Uint160) (*wallet.Token, error) {
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name, err := c.NEP5Name(tokenHash)
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if err != nil {
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return nil, err
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}
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symbol, err := c.NEP5Symbol(tokenHash)
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if err != nil {
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return nil, err
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}
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decimals, err := c.NEP5Decimals(tokenHash)
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if err != nil {
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return nil, err
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}
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return wallet.NewToken(tokenHash, name, symbol, decimals), nil
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}
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// CreateNEP5TransferTx creates an invocation transaction for the 'transfer'
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// method of a given contract (token) to move specified amount of NEP5 assets
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// (in FixedN format using contract's number of decimals) to given account and
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// returns it. The returned transaction is not signed.
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func (c *Client) CreateNEP5TransferTx(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (*transaction.Transaction, error) {
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from, err := address.StringToUint160(acc.Address)
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if err != nil {
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return nil, fmt.Errorf("bad account address: %v", err)
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}
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// Note: we don't use invoke function here because it requires
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// 2 round trips instead of one.
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w := io.NewBufBinWriter()
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emit.AppCallWithOperationAndArgs(w.BinWriter, token, "transfer", from, to, amount)
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emit.Opcode(w.BinWriter, opcode.ASSERT)
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script := w.Bytes()
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result, err := c.InvokeScript(script, []transaction.Cosigner{
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{
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Account: from,
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Scopes: transaction.CalledByEntry,
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},
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})
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if err != nil {
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return nil, fmt.Errorf("can't add system fee to transaction: %v", err)
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}
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tx := transaction.New(c.opts.Network, script, result.GasConsumed)
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tx.Sender = from
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tx.Cosigners = []transaction.Cosigner{
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{
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Account: from,
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Scopes: transaction.CalledByEntry,
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},
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}
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tx.ValidUntilBlock, err = c.CalculateValidUntilBlock()
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if err != nil {
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return nil, fmt.Errorf("can't calculate validUntilBlock: %v", err)
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}
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err = c.AddNetworkFee(tx, gas, acc)
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if err != nil {
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return nil, fmt.Errorf("can't add network fee to transaction: %v", err)
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}
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return tx, nil
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}
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// TransferNEP5 creates an invocation transaction that invokes 'transfer' method
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// on a given token to move specified amount of NEP5 assets (in FixedN format
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// using contract's number of decimals) to given account and sends it to the
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// network returning just a hash of it.
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func (c *Client) TransferNEP5(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (util.Uint256, error) {
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tx, err := c.CreateNEP5TransferTx(acc, to, token, amount, gas)
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if err != nil {
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return util.Uint256{}, err
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}
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if err := acc.SignTx(tx); err != nil {
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return util.Uint256{}, fmt.Errorf("can't sign tx: %v", err)
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}
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return c.SendRawTransaction(tx)
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}
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func topIntFromStack(st []smartcontract.Parameter) (int64, error) {
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index := len(st) - 1 // top stack element is last in the array
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var decimals int64
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switch typ := st[index].Type; typ {
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case smartcontract.IntegerType:
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var ok bool
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decimals, ok = st[index].Value.(int64)
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if !ok {
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return 0, errors.New("invalid Integer item")
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}
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case smartcontract.ByteArrayType:
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data, ok := st[index].Value.([]byte)
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if !ok {
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return 0, errors.New("invalid ByteArray item")
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}
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decimals = bigint.FromBytes(data).Int64()
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default:
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return 0, fmt.Errorf("invalid stack item type: %s", typ)
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}
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return decimals, nil
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}
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func topStringFromStack(st []smartcontract.Parameter) (string, error) {
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index := len(st) - 1 // top stack element is last in the array
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var s string
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switch typ := st[index].Type; typ {
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case smartcontract.StringType:
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var ok bool
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s, ok = st[index].Value.(string)
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if !ok {
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return "", errors.New("invalid String item")
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}
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case smartcontract.ByteArrayType:
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data, ok := st[index].Value.([]byte)
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if !ok {
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return "", errors.New("invalid ByteArray item")
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}
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s = string(data)
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default:
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return "", fmt.Errorf("invalid stack item type: %s", typ)
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}
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return s, nil
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}
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