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- // Copyright 2019 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 core
- import (
- "sync"
- "github.com/ethereum/go-ethereum/common"
- "github.com/ethereum/go-ethereum/core/state"
- )
- // txNoncer is a tiny virtual state database to manage the executable nonces of
- // accounts in the pool, falling back to reading from a real state database if
- // an account is unknown.
- type txNoncer struct {
- fallback *state.StateDB
- nonces map[common.Address]uint64
- lock sync.Mutex
- }
- // newTxNoncer creates a new virtual state database to track the pool nonces.
- func newTxNoncer(statedb *state.StateDB) *txNoncer {
- return &txNoncer{
- fallback: statedb.Copy(),
- nonces: make(map[common.Address]uint64),
- }
- }
- // get returns the current nonce of an account, falling back to a real state
- // database if the account is unknown.
- func (txn *txNoncer) get(addr common.Address) uint64 {
- // We use mutex for get operation is the underlying
- // state will mutate db even for read access.
- txn.lock.Lock()
- defer txn.lock.Unlock()
- if _, ok := txn.nonces[addr]; !ok {
- txn.nonces[addr] = txn.fallback.GetNonce(addr)
- }
- return txn.nonces[addr]
- }
- // set inserts a new virtual nonce into the virtual state database to be returned
- // whenever the pool requests it instead of reaching into the real state database.
- func (txn *txNoncer) set(addr common.Address, nonce uint64) {
- txn.lock.Lock()
- defer txn.lock.Unlock()
- txn.nonces[addr] = nonce
- }
- // setIfLower updates a new virtual nonce into the virtual state database if the
- // the new one is lower.
- func (txn *txNoncer) setIfLower(addr common.Address, nonce uint64) {
- txn.lock.Lock()
- defer txn.lock.Unlock()
- if _, ok := txn.nonces[addr]; !ok {
- txn.nonces[addr] = txn.fallback.GetNonce(addr)
- }
- if txn.nonces[addr] <= nonce {
- return
- }
- txn.nonces[addr] = nonce
- }
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