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account_state.go
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account_state.go
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// Copyright (C) 2018 MediBloc
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package corestate
import (
"github.com/medibloc/go-medibloc/common"
"github.com/medibloc/go-medibloc/common/trie"
"github.com/medibloc/go-medibloc/storage"
"github.com/medibloc/go-medibloc/util/logging"
"github.com/sirupsen/logrus"
)
// Prefixes for blockState trie
const (
AccountPrefix = "ac_" // alias account prefix for account state trie
AliasAccountPrefix = "al_" // alias account prefix for account state trie
)
// AccountState is a struct for account state
type AccountState struct {
*trie.Batch
storage storage.Storage
}
// NewAccountState returns new AccountState
func NewAccountState(rootHash []byte, stor storage.Storage) (*AccountState, error) {
trieBatch, err := trie.NewBatch(rootHash, stor)
if err != nil {
return nil, err
}
return &AccountState{
Batch: trieBatch,
storage: stor,
}, nil
}
// Clone clones state
func (as *AccountState) Clone() (*AccountState, error) {
newBatch, err := as.Batch.Clone()
if err != nil {
return nil, err
}
return &AccountState{
Batch: newBatch,
storage: as.storage,
}, nil
}
// GetAccount returns account
func (as *AccountState) GetAccount(addr common.Address, timestamp int64) (*Account, error) {
acc, err := newAccount(as.storage)
if err != nil {
return nil, err
}
err = as.GetData(append([]byte(AccountPrefix), addr.Bytes()...), acc)
if err == ErrNotFound {
acc.Address = addr
return acc, nil
}
if err != nil {
return nil, err
}
if err := acc.updatePoints(timestamp); err != nil {
return nil, err
}
if err := acc.updateUnstaking(timestamp); err != nil {
return nil, err
}
return acc, nil
}
// PutAccount put account to trie batch
func (as *AccountState) PutAccount(acc *Account) error {
return as.PutData(append([]byte(AccountPrefix), acc.Address.Bytes()...), acc)
}
// Accounts returns account slice, except alias account
func (as *AccountState) Accounts() ([]*Account, error) {
var accounts []*Account
iter, err := as.Iterator([]byte(AccountPrefix))
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to get iterator of account trie.")
return nil, err
}
for {
exist, err := iter.Next()
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to iterate account trie.")
return nil, err
}
if !exist {
break
}
accountBytes := iter.Value()
acc, err := newAccount(as.storage)
if err != nil {
return nil, err
}
if err := acc.FromBytes(accountBytes); err != nil {
return nil, err
}
accounts = append(accounts, acc)
}
return accounts, nil
}
// KeyTrieToSlice generate slice from trie (slice of key)
func KeyTrieToSlice(trie *trie.Batch) [][]byte {
var slice [][]byte
iter, err := trie.Iterator(nil)
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to get iterator of trie.")
return nil
}
exist, err := iter.Next()
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to iterate account trie.")
return nil
}
for exist {
slice = append(slice, iter.Key())
exist, err = iter.Next()
if err != nil {
logging.Console().WithFields(logrus.Fields{
"err": err,
}).Error("Failed to iterate account trie.")
return nil
}
}
return slice
}
// GetAccountByAlias returns account by alias
func (as *AccountState) GetAccountByAlias(alias string, timestamp int64) (*Account, error) {
addrBytes, err := as.Get(append([]byte(AliasAccountPrefix), []byte(alias)...))
if err != nil {
return nil, err
}
addr, err := common.BytesToAddress(addrBytes)
if err != nil {
return nil, err
}
return as.GetAccount(addr, timestamp)
}
// PutAccountAlias put alias name for address
func (as *AccountState) PutAccountAlias(alias string, addr common.Address) error {
return as.Put(append([]byte(AliasAccountPrefix), []byte(alias)...), addr.Bytes())
}
// DelAccountAlias del alias name info
func (as *AccountState) DelAccountAlias(alias string, addr common.Address) error {
addrBytes, err := as.Get(append([]byte(AliasAccountPrefix), []byte(alias)...))
if err != nil {
return err
}
owner, err := common.BytesToAddress(addrBytes)
if err != nil {
return err
}
if !owner.Equals(addr) {
return ErrUnauthorized
}
return as.Delete(append([]byte(AliasAccountPrefix), []byte(alias)...))
}