143 lines
3.7 KiB
Go
143 lines
3.7 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum 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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// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package state
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import (
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"sync"
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"github.com/ethereum/go-ethereum/common"
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)
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type account struct {
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stateObject *StateObject
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nstart uint64
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nonces []bool
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}
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type ManagedState struct {
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*StateDB
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mu sync.RWMutex
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accounts map[string]*account
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}
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// ManagedState returns a new managed state with the statedb as it's backing layer
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func ManageState(statedb *StateDB) *ManagedState {
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return &ManagedState{
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StateDB: statedb.Copy(),
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accounts: make(map[string]*account),
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}
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}
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// SetState sets the backing layer of the managed state
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func (ms *ManagedState) SetState(statedb *StateDB) {
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ms.mu.Lock()
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defer ms.mu.Unlock()
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ms.StateDB = statedb
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}
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// RemoveNonce removed the nonce from the managed state and all future pending nonces
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func (ms *ManagedState) RemoveNonce(addr common.Address, n uint64) {
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if ms.hasAccount(addr) {
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ms.mu.Lock()
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defer ms.mu.Unlock()
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account := ms.getAccount(addr)
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if n-account.nstart <= uint64(len(account.nonces)) {
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reslice := make([]bool, n-account.nstart)
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copy(reslice, account.nonces[:n-account.nstart])
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account.nonces = reslice
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}
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}
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}
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// NewNonce returns the new canonical nonce for the managed account
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func (ms *ManagedState) NewNonce(addr common.Address) uint64 {
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ms.mu.Lock()
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defer ms.mu.Unlock()
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account := ms.getAccount(addr)
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for i, nonce := range account.nonces {
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if !nonce {
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return account.nstart + uint64(i)
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}
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}
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account.nonces = append(account.nonces, true)
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return uint64(len(account.nonces)-1) + account.nstart
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}
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// GetNonce returns the canonical nonce for the managed or unmanged account
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func (ms *ManagedState) GetNonce(addr common.Address) uint64 {
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ms.mu.RLock()
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defer ms.mu.RUnlock()
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if ms.hasAccount(addr) {
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account := ms.getAccount(addr)
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return uint64(len(account.nonces)) + account.nstart
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} else {
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return ms.StateDB.GetNonce(addr)
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}
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}
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// SetNonce sets the new canonical nonce for the managed state
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func (ms *ManagedState) SetNonce(addr common.Address, nonce uint64) {
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ms.mu.Lock()
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defer ms.mu.Unlock()
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so := ms.GetOrNewStateObject(addr)
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so.SetNonce(nonce)
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ms.accounts[addr.Str()] = newAccount(so)
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}
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// HasAccount returns whether the given address is managed or not
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func (ms *ManagedState) HasAccount(addr common.Address) bool {
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ms.mu.RLock()
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defer ms.mu.RUnlock()
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return ms.hasAccount(addr)
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}
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func (ms *ManagedState) hasAccount(addr common.Address) bool {
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_, ok := ms.accounts[addr.Str()]
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return ok
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}
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// populate the managed state
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func (ms *ManagedState) getAccount(addr common.Address) *account {
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straddr := addr.Str()
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if account, ok := ms.accounts[straddr]; !ok {
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so := ms.GetOrNewStateObject(addr)
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ms.accounts[straddr] = newAccount(so)
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} else {
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// Always make sure the state account nonce isn't actually higher
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// than the tracked one.
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so := ms.StateDB.GetStateObject(addr)
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if so != nil && uint64(len(account.nonces))+account.nstart < so.nonce {
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ms.accounts[straddr] = newAccount(so)
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}
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}
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return ms.accounts[straddr]
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}
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func newAccount(so *StateObject) *account {
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return &account{so, so.nonce, nil}
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}
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