neoneo-go/pkg/rpc/client/nep5.go

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package client
import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"github.com/nspcc-dev/neo-go/pkg/wallet"
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)
// TransferTarget represents target address and token amount for transfer.
type TransferTarget struct {
Token util.Uint160
Address util.Uint160
Amount int64
}
var (
// NeoContractHash is a hash of the NEO native contract.
NeoContractHash, _ = util.Uint160DecodeStringBE("25059ecb4878d3a875f91c51ceded330d4575fde")
// GasContractHash is a hash of the GAS native contract.
GasContractHash, _ = util.Uint160DecodeStringBE("bcaf41d684c7d4ad6ee0d99da9707b9d1f0c8e66")
)
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// NEP5Decimals invokes `decimals` NEP5 method on a specified contract.
func (c *Client) NEP5Decimals(tokenHash util.Uint160) (int64, error) {
result, err := c.InvokeFunction(tokenHash, "decimals", []smartcontract.Parameter{}, nil)
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if err != nil {
return 0, err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return 0, errors.New("invalid VM state")
}
return topIntFromStack(result.Stack)
}
// NEP5Name invokes `name` NEP5 method on a specified contract.
func (c *Client) NEP5Name(tokenHash util.Uint160) (string, error) {
result, err := c.InvokeFunction(tokenHash, "name", []smartcontract.Parameter{}, nil)
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if err != nil {
return "", err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return "", errors.New("invalid VM state")
}
return topStringFromStack(result.Stack)
}
// NEP5Symbol invokes `symbol` NEP5 method on a specified contract.
func (c *Client) NEP5Symbol(tokenHash util.Uint160) (string, error) {
result, err := c.InvokeFunction(tokenHash, "symbol", []smartcontract.Parameter{}, nil)
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if err != nil {
return "", err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return "", errors.New("invalid VM state")
}
return topStringFromStack(result.Stack)
}
// NEP5TotalSupply invokes `totalSupply` NEP5 method on a specified contract.
func (c *Client) NEP5TotalSupply(tokenHash util.Uint160) (int64, error) {
result, err := c.InvokeFunction(tokenHash, "totalSupply", []smartcontract.Parameter{}, nil)
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if err != nil {
return 0, err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return 0, errors.New("invalid VM state")
}
return topIntFromStack(result.Stack)
}
// NEP5BalanceOf invokes `balanceOf` NEP5 method on a specified contract.
func (c *Client) NEP5BalanceOf(tokenHash util.Uint160) (int64, error) {
result, err := c.InvokeFunction(tokenHash, "balanceOf", []smartcontract.Parameter{}, nil)
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if err != nil {
return 0, err
} else if result.State != "HALT" || len(result.Stack) == 0 {
return 0, errors.New("invalid VM state")
}
return topIntFromStack(result.Stack)
}
// NEP5TokenInfo returns full NEP5 token info.
func (c *Client) NEP5TokenInfo(tokenHash util.Uint160) (*wallet.Token, error) {
name, err := c.NEP5Name(tokenHash)
if err != nil {
return nil, err
}
symbol, err := c.NEP5Symbol(tokenHash)
if err != nil {
return nil, err
}
decimals, err := c.NEP5Decimals(tokenHash)
if err != nil {
return nil, err
}
return wallet.NewToken(tokenHash, name, symbol, decimals), nil
}
// CreateNEP5TransferTx creates an invocation transaction for the 'transfer'
// method of a given contract (token) to move specified amount of NEP5 assets
// (in FixedN format using contract's number of decimals) to given account and
// returns it. The returned transaction is not signed.
func (c *Client) CreateNEP5TransferTx(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (*transaction.Transaction, error) {
return c.CreateNEP5MultiTransferTx(acc, gas, TransferTarget{
Token: token,
Address: to,
Amount: amount,
})
}
// CreateNEP5MultiTransferTx creates an invocation transaction for performing NEP5 transfers
// from a single sender to multiple recepients.
func (c *Client) CreateNEP5MultiTransferTx(acc *wallet.Account, gas int64, recepients ...TransferTarget) (*transaction.Transaction, error) {
from, err := address.StringToUint160(acc.Address)
if err != nil {
return nil, fmt.Errorf("bad account address: %v", err)
}
w := io.NewBufBinWriter()
for i := range recepients {
emit.AppCallWithOperationAndArgs(w.BinWriter, recepients[i].Token, "transfer", from,
recepients[i].Address, recepients[i].Amount)
emit.Opcode(w.BinWriter, opcode.ASSERT)
}
script := w.Bytes()
result, err := c.InvokeScript(script, []transaction.Signer{
{
Account: from,
Scopes: transaction.CalledByEntry,
},
})
if err != nil {
return nil, fmt.Errorf("can't add system fee to transaction: %v", err)
}
tx := transaction.New(c.opts.Network, script, result.GasConsumed)
tx.Signers = []transaction.Signer{
{
Account: from,
Scopes: transaction.CalledByEntry,
},
}
tx.ValidUntilBlock, err = c.CalculateValidUntilBlock()
if err != nil {
return nil, fmt.Errorf("can't calculate validUntilBlock: %v", err)
}
err = c.AddNetworkFee(tx, gas, acc)
if err != nil {
return nil, fmt.Errorf("can't add network fee to transaction: %v", err)
}
return tx, nil
}
// TransferNEP5 creates an invocation transaction that invokes 'transfer' method
// on a given token to move specified amount of NEP5 assets (in FixedN format
// using contract's number of decimals) to given account and sends it to the
// network returning just a hash of it.
func (c *Client) TransferNEP5(acc *wallet.Account, to util.Uint160, token util.Uint160, amount int64, gas int64) (util.Uint256, error) {
tx, err := c.CreateNEP5TransferTx(acc, to, token, amount, gas)
if err != nil {
return util.Uint256{}, err
}
if err := acc.SignTx(tx); err != nil {
return util.Uint256{}, fmt.Errorf("can't sign tx: %v", err)
}
return c.SendRawTransaction(tx)
}
// MultiTransferNEP5 is similar to TransferNEP5, buf allows to have multiple recepients.
func (c *Client) MultiTransferNEP5(acc *wallet.Account, gas int64, recepients ...TransferTarget) (util.Uint256, error) {
tx, err := c.CreateNEP5MultiTransferTx(acc, gas, recepients...)
if err != nil {
return util.Uint256{}, err
}
if err := acc.SignTx(tx); err != nil {
return util.Uint256{}, fmt.Errorf("can't sign tx: %v", err)
}
return c.SendRawTransaction(tx)
}
func topIntFromStack(st []stackitem.Item) (int64, error) {
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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
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}
func topStringFromStack(st []stackitem.Item) (string, error) {
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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
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}