8f80cafa10
* core: fix write coucurrency in txpool * core: add rlock for pendingState read access * core: address comments
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
// 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
|
|
}
|