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rpc/client: add TransferNEP5 method to easily transfer tokens

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We have TransferAsset for regular tokens, so it'd be nice to have TransferNEP5
for NEP5 ones. Relates to #599.
This commit is contained in:
Roman Khimov 2020-03-16 17:48:57 +03:00
parent a4cf674eff
commit a5e862c351
2 changed files with 50 additions and 28 deletions
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31
cli/wallet/nep5.go
View file

@ -5,15 +5,9 @@ import (
"fmt"
"github.com/nspcc-dev/neo-go/cli/flags"
"github.com/nspcc-dev/neo-go/pkg/core"
"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"
"github.com/nspcc-dev/neo-go/pkg/rpc/client"
"github.com/nspcc-dev/neo-go/pkg/rpc/request"
"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/wallet"
"github.com/urfave/cli"
)
@ -339,38 +333,19 @@ func transferNEP5(ctx *cli.Context) error {
return cli.NewExitError(fmt.Errorf("invalid amount: %v", err), 1)
}
// Note: we don't use invoke function here because it requires
// 2 round trips instead of one.
w := io.NewBufBinWriter()
emit.Int(w.BinWriter, amount)
emit.Bytes(w.BinWriter, to.BytesBE())
emit.Bytes(w.BinWriter, from.BytesBE())
emit.Int(w.BinWriter, 3)
emit.Opcode(w.BinWriter, opcode.PACK)
emit.String(w.BinWriter, "transfer")
emit.AppCall(w.BinWriter, token.Hash, false)
emit.Opcode(w.BinWriter, opcode.THROWIFNOT)
gas := flags.Fixed8FromContext(ctx, "gas")
tx := transaction.NewInvocationTX(w.Bytes(), gas)
tx.AddVerificationHash(from)
if err := request.AddInputsAndUnspentsToTx(tx, fromFlag.String(), core.UtilityTokenID(), gas, c); err != nil {
return cli.NewExitError(fmt.Errorf("can't add GAS to a tx: %v", err), 1)
}
if pass, err := readPassword("Password > "); err != nil {
return cli.NewExitError(err, 1)
} else if err := acc.Decrypt(pass); err != nil {
return cli.NewExitError(err, 1)
} else if err := acc.SignTx(tx); err != nil {
return cli.NewExitError(fmt.Errorf("can't sign tx: %v", err), 1)
}
if err := c.SendRawTransaction(tx); err != nil {
hash, err := c.TransferNEP5(acc, to, token, amount, gas)
if err != nil {
return cli.NewExitError(err, 1)
}
fmt.Println(tx.Hash())
fmt.Println(hash.StringLE())
return nil
}

47
pkg/rpc/client/nep5.go
View file

@ -4,9 +4,15 @@ import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/core"
"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"
"github.com/nspcc-dev/neo-go/pkg/rpc/request"
"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/wallet"
)
@ -87,6 +93,47 @@ func (c *Client) NEP5TokenInfo(tokenHash util.Uint160) (*wallet.Token, error) {
return wallet.NewToken(tokenHash, name, symbol, decimals), 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.
func (c *Client) TransferNEP5(acc *wallet.Account, to util.Uint160, token *wallet.Token, amount int64, gas util.Fixed8) (util.Uint256, error) {
from, err := address.StringToUint160(acc.Address)
if err != nil {
return util.Uint256{}, fmt.Errorf("bad account address: %v", err)
}
// Note: we don't use invoke function here because it requires
// 2 round trips instead of one.
w := io.NewBufBinWriter()
emit.Int(w.BinWriter, amount)
emit.Bytes(w.BinWriter, to.BytesBE())
emit.Bytes(w.BinWriter, from.BytesBE())
emit.Int(w.BinWriter, 3)
emit.Opcode(w.BinWriter, opcode.PACK)
emit.String(w.BinWriter, "transfer")
emit.AppCall(w.BinWriter, token.Hash, false)
emit.Opcode(w.BinWriter, opcode.THROWIFNOT)
tx := transaction.NewInvocationTX(w.Bytes(), gas)
tx.Attributes = append(tx.Attributes, transaction.Attribute{
Usage: transaction.Script,
Data: from.BytesBE(),
})
if err := request.AddInputsAndUnspentsToTx(tx, acc.Address, core.UtilityTokenID(), gas, c); err != nil {
return util.Uint256{}, fmt.Errorf("can't add GAS to transaction: %v", err)
}
if err := acc.SignTx(tx); err != nil {
return util.Uint256{}, fmt.Errorf("can't sign tx: %v", err)
}
if err := c.SendRawTransaction(tx); err != nil {
return util.Uint256{}, err
}
return tx.Hash(), nil
}
func topIntFromStack(st []smartcontract.Parameter) (int64, error) {
index := len(st) - 1 // top stack element is last in the array
var decimals int64