/
delegate_object.go
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/
delegate_object.go
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// Copyright 2021 The go-aoa Authors
// This file is part of the go-aoa library.
//
// The the go-aoa 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 the go-aoa 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-aoa library. If not, see <http://www.gnu.org/licenses/>.
package delegatestate
import (
"bytes"
"fmt"
"github.com/Aurorachain-io/go-aoa/common"
"github.com/Aurorachain-io/go-aoa/crypto"
"github.com/Aurorachain-io/go-aoa/rlp"
"github.com/Aurorachain-io/go-aoa/trie"
"io"
"math/big"
)
type delegateObject struct {
address common.Address
addrHash common.Hash // hash of eminer-pro address of the account
data Delegate
db *DelegateDB
// DB error.
// State objects are used by the consensus core and VM which are
// unable to deal with database-level errors. Any error that occurs
// during a database read is memoized here and will eventually be returned
// by DelegateDB.Commit.
dbErr error
// Write caches.
trie Trie // storage trie, which becomes non-nil on first access
cachedStorage Storage // Storage entry cache to avoid duplicate reads
dirtyStorage Storage // Storage entries that need to be flushed to disk
touched bool
deleted bool
suicided bool
onDirty func(addr common.Address) // Callback method to mark a state object newly dirty
}
type Delegate struct {
Root common.Hash // merkle root of the storage trie
Vote *big.Int // vote number
Nickname string // delegate name
RegisterTime uint64 // delegate register time
Delete bool // whether delete
}
// Returns the address of the contract/account
func (delegateObject *delegateObject) Address() common.Address {
return delegateObject.address
}
// newObject creates a state object.
func newObject(db *DelegateDB, address common.Address, delegate Delegate, onDirty func(addr common.Address)) *delegateObject {
if delegate.Vote == nil {
delegate.Vote = big.NewInt(0)
}
dObject := &delegateObject{
db: db,
address: address,
addrHash: crypto.Keccak256Hash(address[:]),
data: delegate,
cachedStorage: make(Storage),
dirtyStorage: make(Storage),
onDirty: onDirty,
}
dObject.tryMarkDirty()
return dObject
}
func (delegateObject *delegateObject) getTrie(db Database) Trie {
if delegateObject.trie == nil {
var err error
delegateObject.trie, err = db.OpenStorageTrie(delegateObject.addrHash, delegateObject.data.Root)
if err != nil {
delegateObject.trie, _ = db.OpenStorageTrie(delegateObject.addrHash, common.Hash{})
delegateObject.setError(fmt.Errorf("can't create storage trie: %v", err))
}
}
return delegateObject.trie
}
func (d *delegateObject) touch() {
d.db.journal = append(d.db.journal, touchChange{
account: &d.address,
prev: d.touched,
prevDirty: d.onDirty == nil,
})
if d.onDirty != nil {
d.onDirty(d.Address())
d.onDirty = nil
}
d.touched = true
}
func (d *delegateObject) Vote() *big.Int {
return new(big.Int).Set(d.data.Vote)
}
func (d *delegateObject) SubVote(amount *big.Int) {
if amount.Sign() == 0 {
return
}
result := new(big.Int).Sub(d.Vote(), amount)
if result.Cmp(common.Big0) < 0 {
d.setVote(common.Big0)
} else {
d.setVote(result)
}
}
func (d *delegateObject) AddVote(amount *big.Int) {
if amount.Sign() == 0 {
if d.empty() {
d.touch()
}
return
}
d.setVote(new(big.Int).Add(d.Vote(), amount))
}
func (d *delegateObject) SetVote(amount *big.Int) {
d.db.journal = append(d.db.journal, voteChange{
account: &d.address,
prev: new(big.Int).Set(d.data.Vote),
})
d.setVote(amount)
}
func (d *delegateObject) setVote(amount *big.Int) {
d.data.Vote = amount
if d.onDirty != nil {
d.onDirty(d.Address())
d.onDirty = nil
}
}
// GetState returns a value in account storage.
func (delegateObject *delegateObject) GetState(db Database, key common.Hash) common.Hash {
value, exists := delegateObject.cachedStorage[key]
if exists {
return value
}
// Load from DB in case it is missing.
enc, err := delegateObject.getTrie(db).TryGet(key[:])
if err != nil {
delegateObject.setError(err)
return common.Hash{}
}
if len(enc) > 0 {
_, content, _, err := rlp.Split(enc)
if err != nil {
delegateObject.setError(err)
}
value.SetBytes(content)
}
if (value != common.Hash{}) {
delegateObject.cachedStorage[key] = value
}
return value
}
// SetState updates a value in account storage.
func (delegateObject *delegateObject) SetState(db Database, key, value common.Hash) {
delegateObject.db.journal = append(delegateObject.db.journal, storageChange{
account: &delegateObject.address,
key: key,
prevalue: delegateObject.GetState(db, key),
})
delegateObject.setState(key, value)
}
func (delegateObject *delegateObject) setState(key, value common.Hash) {
delegateObject.cachedStorage[key] = value
delegateObject.dirtyStorage[key] = value
if delegateObject.onDirty != nil {
delegateObject.onDirty(delegateObject.Address())
delegateObject.onDirty = nil
}
}
// updateTrie writes cached storage modifications into the object's storage trie.
func (delegateObject *delegateObject) updateTrie(db Database) Trie {
tr := delegateObject.getTrie(db)
for key, value := range delegateObject.dirtyStorage {
delete(delegateObject.dirtyStorage, key)
if (value == common.Hash{}) {
delegateObject.setError(tr.TryDelete(key[:]))
continue
}
// Encoding []byte cannot fail, ok to ignore the error.
v, _ := rlp.EncodeToBytes(bytes.TrimLeft(value[:], "\x00"))
delegateObject.setError(tr.TryUpdate(key[:], v))
}
return tr
}
// UpdateRoot sets the trie root to the current root hash of
func (delegateObject *delegateObject) updateRoot(db Database) {
delegateObject.updateTrie(db)
delegateObject.data.Root = delegateObject.trie.Hash()
}
// CommitTrie the storage trie of the object to dwb.
// This updates the trie root.
func (delegateObject *delegateObject) CommitTrie(db Database, dbw trie.DatabaseWriter) error {
delegateObject.updateTrie(db)
if delegateObject.dbErr != nil {
return delegateObject.dbErr
}
root, err := delegateObject.trie.CommitTo(dbw)
if err == nil {
delegateObject.data.Root = root
}
return err
}
func (d *delegateObject) markSuicided() {
d.suicided = true
d.tryMarkDirty()
}
func (delegateObject *delegateObject) deepCopy(db *DelegateDB, onDirty func(addr common.Address)) *delegateObject {
stateObject := newObject(db, delegateObject.address, delegateObject.data, onDirty)
if delegateObject.trie != nil {
stateObject.trie = db.db.CopyTrie(delegateObject.trie)
}
stateObject.dirtyStorage = delegateObject.dirtyStorage.Copy()
stateObject.cachedStorage = delegateObject.dirtyStorage.Copy()
stateObject.deleted = delegateObject.deleted
return stateObject
}
func (delegateObject *delegateObject) empty() bool {
return false
}
// setError remembers the first non-nil error it is called with.
func (delegateObject *delegateObject) setError(err error) {
if delegateObject.dbErr == nil {
delegateObject.dbErr = err
}
}
// EncodeRLP implements rlp.Encoder.
func (delegateObject *delegateObject) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, delegateObject.data)
}
func (delegateObject *delegateObject) tryMarkDirty() {
if delegateObject.onDirty != nil {
delegateObject.onDirty(delegateObject.Address())
delegateObject.onDirty = nil
}
}