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package state
import (
"sync"
"github.com/ethereum/go-ethereum/common"
)
type account struct {
stateObject *StateObject
nstart uint64
nonces []bool
}
type ManagedState struct {
*StateDB
mu sync.RWMutex
accounts map[string]*account
}
func ManageState(statedb *StateDB) *ManagedState {
return &ManagedState{
StateDB: statedb,
accounts: make(map[string]*account),
}
}
func (ms *ManagedState) SetState(statedb *StateDB) {
ms.mu.Lock()
defer ms.mu.Unlock()
ms.StateDB = statedb
}
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
}
}
}
func (ms *ManagedState) NewNonce(addr common.Address) uint64 {
ms.mu.RLock()
defer ms.mu.RUnlock()
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)) + account.nstart
}
func (ms *ManagedState) hasAccount(addr common.Address) bool {
_, ok := ms.accounts[addr.Str()]
return ok
}
func (ms *ManagedState) getAccount(addr common.Address) *account {
straddr := addr.Str()
if account, ok := ms.accounts[straddr]; !ok {
so := ms.GetOrNewStateObject(addr)
ms.accounts[straddr] = 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[straddr] = newAccount(so)
}
}
return ms.accounts[straddr]
}
func newAccount(so *StateObject) *account {
return &account{so, so.nonce - 1, nil}
}
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