Official Go implementation of the Ethereum protocol
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go-ethereum/core/state/sync.go

57 lines
2.2 KiB

// 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"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
// NewStateSync create a new state trie download scheduler.
func NewStateSync(root common.Hash, database ethdb.KeyValueReader, onLeaf func(keys [][]byte, leaf []byte) error, scheme trie.NodeScheme) *trie.Sync {
// Register the storage slot callback if the external callback is specified.
var onSlot func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error
if onLeaf != nil {
onSlot = func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error {
return onLeaf(keys, leaf)
}
}
// Register the account callback to connect the state trie and the storage
// trie belongs to the contract.
var syncer *trie.Sync
onAccount := func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error {
if onLeaf != nil {
if err := onLeaf(keys, leaf); err != nil {
return err
}
}
var obj types.StateAccount
if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
return err
}
syncer.AddSubTrie(obj.Root, path, parent, parentPath, onSlot)
syncer.AddCodeEntry(common.BytesToHash(obj.CodeHash), path, parent, parentPath)
return nil
}
syncer = trie.NewSync(root, database, onAccount, scheme)
return syncer
}