github.com/ethereum/go-ethereum@v1.14.3/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  	"github.com/ethereum/go-ethereum/common"
    21  	"github.com/ethereum/go-ethereum/core/types"
    22  	"github.com/ethereum/go-ethereum/ethdb"
    23  	"github.com/ethereum/go-ethereum/rlp"
    24  	"github.com/ethereum/go-ethereum/trie"
    25  )
    26  
    27  // NewStateSync creates a new state trie download scheduler.
    28  func NewStateSync(root common.Hash, database ethdb.KeyValueReader, onLeaf func(keys [][]byte, leaf []byte) error, scheme string) *trie.Sync {
    29  	// Register the storage slot callback if the external callback is specified.
    30  	var onSlot func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error
    31  	if onLeaf != nil {
    32  		onSlot = func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error {
    33  			return onLeaf(keys, leaf)
    34  		}
    35  	}
    36  	// Register the account callback to connect the state trie and the storage
    37  	// trie belongs to the contract.
    38  	var syncer *trie.Sync
    39  	onAccount := func(keys [][]byte, path []byte, leaf []byte, parent common.Hash, parentPath []byte) error {
    40  		if onLeaf != nil {
    41  			if err := onLeaf(keys, leaf); err != nil {
    42  				return err
    43  			}
    44  		}
    45  		var obj types.StateAccount
    46  		if err := rlp.DecodeBytes(leaf, &obj); err != nil {
    47  			return err
    48  		}
    49  		syncer.AddSubTrie(obj.Root, path, parent, parentPath, onSlot)
    50  		syncer.AddCodeEntry(common.BytesToHash(obj.CodeHash), path, parent, parentPath)
    51  		return nil
    52  	}
    53  	syncer = trie.NewSync(root, database, onAccount, scheme)
    54  	return syncer
    55  }