github.com/clem109/go-ethereum@v1.8.3-0.20180316121352-fe6cf00f480a/core/state/sync.go (about)

     1  // Copyright 2015 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package state
    18  
    19  import (
    20  	"bytes"
    21  
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/rlp"
    24  	"github.com/ethereum/go-ethereum/trie"
    25  )
    26  
    27  // NewStateSync create a new state trie download scheduler.
    28  func NewStateSync(root common.Hash, database trie.DatabaseReader) *trie.TrieSync {
    29  	var syncer *trie.TrieSync
    30  	callback := func(leaf []byte, parent common.Hash) error {
    31  		var obj Account
    32  		if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
    33  			return err
    34  		}
    35  		syncer.AddSubTrie(obj.Root, 64, parent, nil)
    36  		syncer.AddRawEntry(common.BytesToHash(obj.CodeHash), 64, parent)
    37  		return nil
    38  	}
    39  	syncer = trie.NewTrieSync(root, database, callback)
    40  	return syncer
    41  }