92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package transactions
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import (
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"bytes"
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"context"
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"encoding/json"
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"errors"
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ethereum "github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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)
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var (
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// ErrInvalidSendTxArgs is returned when the structure of SendTxArgs is ambigious.
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ErrInvalidSendTxArgs = errors.New("Transaction arguments are invalid (are both 'input' and 'data' fields used?)")
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// ErrUnexpectedArgs returned when args are of unexpected length.
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ErrUnexpectedArgs = errors.New("unexpected args")
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//ErrInvalidCompleteTxSender - error transaction with invalid sender
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ErrInvalidCompleteTxSender = errors.New("transaction can only be completed by its creator")
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)
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// PendingNonceProvider provides information about nonces.
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type PendingNonceProvider interface {
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PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
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}
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// GasCalculator provides methods for estimating and pricing gas.
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type GasCalculator interface {
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ethereum.GasEstimator
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ethereum.GasPricer
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}
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// SendTxArgs represents the arguments to submit a new transaction into the transaction pool.
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// This struct is based on go-ethereum's type in internal/ethapi/api.go, but we have freedom
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// over the exact layout of this struct.
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type SendTxArgs struct {
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From common.Address `json:"from"`
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To *common.Address `json:"to"`
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Gas *hexutil.Uint64 `json:"gas"`
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GasPrice *hexutil.Big `json:"gasPrice"`
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Value *hexutil.Big `json:"value"`
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Nonce *hexutil.Uint64 `json:"nonce"`
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// We keep both "input" and "data" for backward compatibility.
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// "input" is a preferred field.
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// see `vendor/github.com/ethereum/go-ethereum/internal/ethapi/api.go:1107`
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Input hexutil.Bytes `json:"input"`
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Data hexutil.Bytes `json:"data"`
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}
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// Valid checks whether this structure is filled in correctly.
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func (args SendTxArgs) Valid() bool {
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// if at least one of the fields is empty, it is a valid struct
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if isNilOrEmpty(args.Input) || isNilOrEmpty(args.Data) {
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return true
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}
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// we only allow both fields to present if they have the same data
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return bytes.Equal(args.Input, args.Data)
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}
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// GetInput returns either Input or Data field's value dependent on what is filled.
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func (args SendTxArgs) GetInput() hexutil.Bytes {
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if !isNilOrEmpty(args.Input) {
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return args.Input
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}
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return args.Data
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}
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func isNilOrEmpty(bytes hexutil.Bytes) bool {
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return bytes == nil || len(bytes) == 0
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}
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// RPCCalltoSendTxArgs creates SendTxArgs based on RPC parameters
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func RPCCalltoSendTxArgs(args ...interface{}) (SendTxArgs, error) {
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var txArgs SendTxArgs
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if len(args) != 1 {
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return txArgs, ErrUnexpectedArgs
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}
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data, err := json.Marshal(args[0])
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if err != nil {
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return txArgs, err
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}
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if err := json.Unmarshal(data, &txArgs); err != nil {
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return txArgs, err
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}
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return txArgs, nil
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}
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