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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 (
"bytes"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto/sha3"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
type StateSync struct {
db ethdb.Database
sync *trie.TrieSync
codeReqs map[common.Hash]struct{} // requested but not yet written to database
codeReqList []common.Hash // requested since last Missing
}
var sha3_nil = common.BytesToHash(sha3.NewKeccak256().Sum(nil))
func NewStateSync(root common.Hash, db ethdb.Database) *StateSync {
ss := &StateSync{
db: db,
codeReqs: make(map[common.Hash]struct{}),
}
ss.codeReqs[sha3_nil] = struct{}{} // never request the nil hash
ss.sync = trie.NewTrieSync(root, db, ss.leafFound)
return ss
}
func (self *StateSync) leafFound(leaf []byte, parent common.Hash) error {
var obj struct {
Nonce uint64
Balance *big.Int
Root common.Hash
CodeHash []byte
}
if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
return err
}
self.sync.AddSubTrie(obj.Root, 64, parent, nil)
codehash := common.BytesToHash(obj.CodeHash)
if _, ok := self.codeReqs[codehash]; !ok {
code, _ := self.db.Get(obj.CodeHash)
if code == nil {
self.codeReqs[codehash] = struct{}{}
self.codeReqList = append(self.codeReqList, codehash)
}
}
return nil
}
func (self *StateSync) Missing(max int) []common.Hash {
cr := len(self.codeReqList)
gh := 0
if max != 0 {
if cr > max {
cr = max
}
gh = max - cr
}
list := append(self.sync.Missing(gh), self.codeReqList[:cr]...)
self.codeReqList = self.codeReqList[cr:]
return list
}
func (self *StateSync) Process(list []trie.SyncResult) error {
for i := 0; i < len(list); i++ {
if _, ok := self.codeReqs[list[i].Hash]; ok { // code data, not a node
self.db.Put(list[i].Hash[:], list[i].Data)
delete(self.codeReqs, list[i].Hash)
list[i] = list[len(list)-1]
list = list[:len(list)-1]
i--
}
}
_, err := self.sync.Process(list)
return err
}
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