github.com/klaytn/klaytn@v1.12.1/api/addrlock.go (about)

     1  // Modifications Copyright 2018 The klaytn Authors
     2  // Copyright 2017 The go-ethereum Authors
     3  // This file is part of the go-ethereum library.
     4  //
     5  // The go-ethereum library is free software: you can redistribute it and/or modify
     6  // it under the terms of the GNU Lesser General Public License as published by
     7  // the Free Software Foundation, either version 3 of the License, or
     8  // (at your option) any later version.
     9  //
    10  // The go-ethereum library is distributed in the hope that it will be useful,
    11  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  // GNU Lesser General Public License for more details.
    14  //
    15  // You should have received a copy of the GNU Lesser General Public License
    16  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    17  //
    18  // This file is derived from internal/ethapi/addrlock.go (2018/06/04).
    19  // Modified and improved for the klaytn development.
    20  
    21  package api
    22  
    23  import (
    24  	"sync"
    25  
    26  	"github.com/klaytn/klaytn/common"
    27  )
    28  
    29  type AddrLocker struct {
    30  	mu    sync.Mutex
    31  	locks map[common.Address]*sync.Mutex
    32  }
    33  
    34  // lock returns the lock of the given address.
    35  func (l *AddrLocker) lock(address common.Address) *sync.Mutex {
    36  	l.mu.Lock()
    37  	defer l.mu.Unlock()
    38  	if l.locks == nil {
    39  		l.locks = make(map[common.Address]*sync.Mutex)
    40  	}
    41  	if _, ok := l.locks[address]; !ok {
    42  		l.locks[address] = new(sync.Mutex)
    43  	}
    44  	return l.locks[address]
    45  }
    46  
    47  // LockAddr locks an account's mutex. This is used to prevent another tx getting the
    48  // same nonce until the lock is released. The mutex prevents the (an identical nonce) from
    49  // being read again during the time that the first transaction is being signed.
    50  func (l *AddrLocker) LockAddr(address common.Address) {
    51  	l.lock(address).Lock()
    52  }
    53  
    54  // UnlockAddr unlocks the mutex of the given account.
    55  func (l *AddrLocker) UnlockAddr(address common.Address) {
    56  	l.lock(address).Unlock()
    57  }