package rpc import ( "sync" "github.com/ethereum/go-ethereum/common" ) // AddrLocker is a mutex structure used to avoid querying outdated account data type AddrLocker struct { mu sync.Mutex locks map[common.Address]*sync.Mutex } // lock returns the lock of the given address.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() }