github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/internal/ethapi/addrlock.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar 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-aigar 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-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package ethapi
    19  
    20  import (
    21  	"sync"
    22  
    23  	"github.com/AigarNetwork/aigar/common"
    24  )
    25  
    26  type AddrLocker struct {
    27  	mu    sync.Mutex
    28  	locks map[common.Address]*sync.Mutex
    29  }
    30  
    31  // lock returns the lock of the given address.
    32  func (l *AddrLocker) lock(address common.Address) *sync.Mutex {
    33  	l.mu.Lock()
    34  	defer l.mu.Unlock()
    35  	if l.locks == nil {
    36  		l.locks = make(map[common.Address]*sync.Mutex)
    37  	}
    38  	if _, ok := l.locks[address]; !ok {
    39  		l.locks[address] = new(sync.Mutex)
    40  	}
    41  	return l.locks[address]
    42  }
    43  
    44  // LockAddr locks an account's mutex. This is used to prevent another tx getting the
    45  // same nonce until the lock is released. The mutex prevents the (an identical nonce) from
    46  // being read again during the time that the first transaction is being signed.
    47  func (l *AddrLocker) LockAddr(address common.Address) {
    48  	l.lock(address).Lock()
    49  }
    50  
    51  // UnlockAddr unlocks the mutex of the given account.
    52  func (l *AddrLocker) UnlockAddr(address common.Address) {
    53  	l.lock(address).Unlock()
    54  }