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types.go
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types.go
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package transactions
import (
"bytes"
"context"
"errors"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
)
var (
// ErrInvalidSendTxArgs is returned when the structure of SendTxArgs is ambigious.
ErrInvalidSendTxArgs = errors.New("transaction arguments are invalid")
// ErrUnexpectedArgs is returned when args are of unexpected length.
ErrUnexpectedArgs = errors.New("unexpected args")
//ErrInvalidTxSender is returned when selected account is different tham From field.
ErrInvalidTxSender = errors.New("transaction can only be send by its creator")
)
// PendingNonceProvider provides information about nonces.
type PendingNonceProvider interface {
PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
}
// GasCalculator provides methods for estimating and pricing gas.
type GasCalculator interface {
ethereum.GasEstimator
ethereum.GasPricer
}
// SendTxArgs represents the arguments to submit a new transaction into the transaction pool.
// This struct is based on go-ethereum's type in internal/ethapi/api.go, but we have freedom
// over the exact layout of this struct.
type SendTxArgs struct {
From common.Address `json:"from"`
To *common.Address `json:"to"`
Gas *hexutil.Uint64 `json:"gas"`
GasPrice *hexutil.Big `json:"gasPrice"`
Value *hexutil.Big `json:"value"`
Nonce *hexutil.Uint64 `json:"nonce"`
// We keep both "input" and "data" for backward compatibility.
// "input" is a preferred field.
// see `vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go:1107`
Input hexutil.Bytes `json:"input"`
Data hexutil.Bytes `json:"data"`
}
// Valid checks whether this structure is filled in correctly.
func (args SendTxArgs) Valid() bool {
// if at least one of the fields is empty, it is a valid struct
if isNilOrEmpty(args.Input) || isNilOrEmpty(args.Data) {
return true
}
// we only allow both fields to present if they have the same data
return bytes.Equal(args.Input, args.Data)
}
// GetInput returns either Input or Data field's value dependent on what is filled.
func (args SendTxArgs) GetInput() hexutil.Bytes {
if !isNilOrEmpty(args.Input) {
return args.Input
}
return args.Data
}
func isNilOrEmpty(bytes hexutil.Bytes) bool {
return bytes == nil || len(bytes) == 0
}