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// Copyright 2015 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 state
import (
"sync"
"github.com/dexon-foundation/dexon/common"
)
type account struct {
stateObject *stateObject
nstart uint64
nonces []bool
}
type ManagedState struct {
*StateDB
mu sync.RWMutex
accounts map[common.Address]*account
}
// ManagedState returns a new managed state with the statedb as it's backing layer
func ManageState(statedb *StateDB) *ManagedState {
return &ManagedState{
StateDB: statedb.Copy(),
accounts: make(map[common.Address]*account),
}
}
// SetState sets the backing layer of the managed state
func (ms *ManagedState) SetState(statedb *StateDB) {
ms.mu.Lock()
defer ms.mu.Unlock()
ms.StateDB = statedb
}
// RemoveNonce removed the nonce from the managed state and all future pending nonces
func (ms *ManagedState) RemoveNonce(addr common.Address, n uint64) {
if ms.hasAccount(addr) {
ms.mu.Lock()
defer ms.mu.Unlock()
account := ms.getAccount(addr)
if n-account.nstart <= uint64(len(account.nonces)) {
reslice := make([]bool, n-account.nstart)
copy(reslice, account.nonces[:n-account.nstart])
account.nonces = reslice
}
}
}
// NewNonce returns the new canonical nonce for the managed account
func (ms *ManagedState) NewNonce(addr common.Address) uint64 {
ms.mu.Lock()
defer ms.mu.Unlock()
account := ms.getAccount(addr)
for i, nonce := range account.nonces {
if !nonce {
return account.nstart + uint64(i)
}
}
account.nonces = append(account.nonces, true)
return uint64(len(account.nonces)-1) + account.nstart
}
// GetNonce returns the canonical nonce for the managed or unmanaged account.
//
// Because GetNonce mutates the DB, we must take a write lock.
func (ms *ManagedState) GetNonce(addr common.Address) uint64 {
ms.mu.Lock()
defer ms.mu.Unlock()
if ms.hasAccount(addr) {
account := ms.getAccount(addr)
return uint64(len(account.nonces)) + account.nstart
} else {
return ms.StateDB.GetNonce(addr)
}
}
// SetNonce sets the new canonical nonce for the managed state
func (ms *ManagedState) SetNonce(addr common.Address, nonce uint64) {
ms.mu.Lock()
defer ms.mu.Unlock()
so := ms.GetOrNewStateObject(addr)
so.SetNonce(nonce)
ms.accounts[addr] = newAccount(so)
}
// HasAccount returns whether the given address is managed or not
func (ms *ManagedState) HasAccount(addr common.Address) bool {
ms.mu.RLock()
defer ms.mu.RUnlock()
return ms.hasAccount(addr)
}
func (ms *ManagedState) hasAccount(addr common.Address) bool {
_, ok := ms.accounts[addr]
return ok
}
// populate the managed state
func (ms *ManagedState) getAccount(addr common.Address) *account {
if account, ok := ms.accounts[addr]; !ok {
so := ms.GetOrNewStateObject(addr)
ms.accounts[addr] = newAccount(so)
} else {
// Always make sure the state account nonce isn't actually higher
// than the tracked one.
so := ms.StateDB.getStateObject(addr)
if so != nil && uint64(len(account.nonces))+account.nstart < so.Nonce() {
ms.accounts[addr] = newAccount(so)
}
}
return ms.accounts[addr]
}
func newAccount(so *stateObject) *account {
return &account{so, so.Nonce(), nil}
}
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