github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/ethclient/signer.go (about) 1 // This file is part of the go-sberex library. The go-sberex library is 2 // free software: you can redistribute it and/or modify it under the terms 3 // of the GNU Lesser General Public License as published by the Free 4 // Software Foundation, either version 3 of the License, or (at your option) 5 // any later version. 6 // 7 // The go-sberex library is distributed in the hope that it will be useful, 8 // but WITHOUT ANY WARRANTY; without even the implied warranty of 9 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 10 // General Public License <http://www.gnu.org/licenses/> for more details. 11 12 package ethclient 13 14 import ( 15 "errors" 16 "math/big" 17 18 "github.com/Sberex/go-sberex/common" 19 "github.com/Sberex/go-sberex/core/types" 20 ) 21 22 // senderFromServer is a types.Signer that remembers the sender address returned by the RPC 23 // server. It is stored in the transaction's sender address cache to avoid an additional 24 // request in TransactionSender. 25 type senderFromServer struct { 26 addr common.Address 27 blockhash common.Hash 28 } 29 30 var errNotCached = errors.New("sender not cached") 31 32 func setSenderFromServer(tx *types.Transaction, addr common.Address, block common.Hash) { 33 // Use types.Sender for side-effect to store our signer into the cache. 34 types.Sender(&senderFromServer{addr, block}, tx) 35 } 36 37 func (s *senderFromServer) Equal(other types.Signer) bool { 38 os, ok := other.(*senderFromServer) 39 return ok && os.blockhash == s.blockhash 40 } 41 42 func (s *senderFromServer) Sender(tx *types.Transaction) (common.Address, error) { 43 if s.blockhash == (common.Hash{}) { 44 return common.Address{}, errNotCached 45 } 46 return s.addr, nil 47 } 48 49 func (s *senderFromServer) Hash(tx *types.Transaction) common.Hash { 50 panic("can't sign with senderFromServer") 51 } 52 func (s *senderFromServer) SignatureValues(tx *types.Transaction, sig []byte) (R, S, V *big.Int, err error) { 53 panic("can't sign with senderFromServer") 54 }