92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package legacypool
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import (
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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)
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// noncer is a tiny virtual state database to manage the executable nonces of
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// accounts in the pool, falling back to reading from a real state database if
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// an account is unknown.
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type noncer struct {
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fallback *state.StateDB
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nonces map[common.Address]uint64
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lock sync.Mutex
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}
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// newNoncer creates a new virtual state database to track the pool nonces.
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func newNoncer(statedb *state.StateDB) *noncer {
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return &noncer{
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fallback: statedb.Copy(),
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nonces: make(map[common.Address]uint64),
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}
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}
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// get returns the current nonce of an account, falling back to a real state
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// database if the account is unknown.
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func (txn *noncer) get(addr common.Address) uint64 {
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// We use mutex for get operation is the underlying
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// state will mutate db even for read access.
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txn.lock.Lock()
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defer txn.lock.Unlock()
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if _, ok := txn.nonces[addr]; !ok {
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if nonce := txn.fallback.GetNonce(addr); nonce != 0 {
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txn.nonces[addr] = nonce
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}
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}
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return txn.nonces[addr]
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}
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// set inserts a new virtual nonce into the virtual state database to be returned
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// whenever the pool requests it instead of reaching into the real state database.
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func (txn *noncer) set(addr common.Address, nonce uint64) {
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txn.lock.Lock()
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defer txn.lock.Unlock()
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txn.nonces[addr] = nonce
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}
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// setIfLower updates a new virtual nonce into the virtual state database if the
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// new one is lower.
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func (txn *noncer) setIfLower(addr common.Address, nonce uint64) {
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txn.lock.Lock()
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defer txn.lock.Unlock()
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if _, ok := txn.nonces[addr]; !ok {
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if nonce := txn.fallback.GetNonce(addr); nonce != 0 {
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txn.nonces[addr] = nonce
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}
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}
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if txn.nonces[addr] <= nonce {
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return
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}
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txn.nonces[addr] = nonce
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}
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// setAll sets the nonces for all accounts to the given map.
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func (txn *noncer) setAll(all map[common.Address]uint64) {
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txn.lock.Lock()
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defer txn.lock.Unlock()
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txn.nonces = all
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}
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