github.com/MetalBlockchain/subnet-evm@v0.4.9/ethclient/signer.go (about)

     1  // (c) 2019-2020, Ava Labs, Inc.
     2  //
     3  // This file is a derived work, based on the go-ethereum library whose original
     4  // notices appear below.
     5  //
     6  // It is distributed under a license compatible with the licensing terms of the
     7  // original code from which it is derived.
     8  //
     9  // Much love to the original authors for their work.
    10  // **********
    11  // Copyright 2017 The go-ethereum Authors
    12  // This file is part of the go-ethereum library.
    13  //
    14  // The go-ethereum library is free software: you can redistribute it and/or modify
    15  // it under the terms of the GNU Lesser General Public License as published by
    16  // the Free Software Foundation, either version 3 of the License, or
    17  // (at your option) any later version.
    18  //
    19  // The go-ethereum library is distributed in the hope that it will be useful,
    20  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    21  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    22  // GNU Lesser General Public License for more details.
    23  //
    24  // You should have received a copy of the GNU Lesser General Public License
    25  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    26  
    27  package ethclient
    28  
    29  import (
    30  	"errors"
    31  	"math/big"
    32  
    33  	"github.com/MetalBlockchain/subnet-evm/core/types"
    34  	"github.com/ethereum/go-ethereum/common"
    35  )
    36  
    37  // senderFromServer is a types.Signer that remembers the sender address returned by the RPC
    38  // server. It is stored in the transaction's sender address cache to avoid an additional
    39  // request in TransactionSender.
    40  type senderFromServer struct {
    41  	addr      common.Address
    42  	blockhash common.Hash
    43  }
    44  
    45  var errNotCached = errors.New("sender not cached")
    46  
    47  func setSenderFromServer(tx *types.Transaction, addr common.Address, block common.Hash) {
    48  	// Use types.Sender for side-effect to store our signer into the cache.
    49  	types.Sender(&senderFromServer{addr, block}, tx)
    50  }
    51  
    52  func (s *senderFromServer) Equal(other types.Signer) bool {
    53  	os, ok := other.(*senderFromServer)
    54  	return ok && os.blockhash == s.blockhash
    55  }
    56  
    57  func (s *senderFromServer) Sender(tx *types.Transaction) (common.Address, error) {
    58  	if s.addr == (common.Address{}) {
    59  		return common.Address{}, errNotCached
    60  	}
    61  	return s.addr, nil
    62  }
    63  
    64  func (s *senderFromServer) ChainID() *big.Int {
    65  	panic("can't sign with senderFromServer")
    66  }
    67  func (s *senderFromServer) Hash(tx *types.Transaction) common.Hash {
    68  	panic("can't sign with senderFromServer")
    69  }
    70  func (s *senderFromServer) SignatureValues(tx *types.Transaction, sig []byte) (R, S, V *big.Int, err error) {
    71  	panic("can't sign with senderFromServer")
    72  }