path: root/internal/ethapi/addrlock.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package ethapi

import (
    "sync"

    "github.com/ethereum/go-ethereum/common"
)

type AddrLocker struct {
    mu    sync.Mutex
    locks map[common.Address]*sync.Mutex
}

// lock returns the lock of the given address.
func (l *AddrLocker) lock(address common.Address) *sync.Mutex {
    l.mu.Lock()
    defer l.mu.Unlock()
    if l.locks == nil {
        l.locks = make(map[common.Address]*sync.Mutex)
    }
    if _, ok := l.locks[address]; !ok {
        l.locks[address] = new(sync.Mutex)
    }
    return l.locks[address]
}

// LockAddr locks an account's mutex. This is used to prevent another tx getting the
// same nonce until the lock is released. The mutex prevents the (an identical nonce) from
// being read again during the time that the first transaction is being signed.
func (l *AddrLocker) LockAddr(address common.Address) {
    l.lock(address).Lock()
}

// UnlockAddr unlocks the mutex of the given account.
func (l *AddrLocker) UnlockAddr(address common.Address) {
    l.lock(address).Unlock()
}