github.com/shrimpyuk/bor@v0.2.15-0.20220224151350-fb4ec6020bae/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/core/types"
    24  	"github.com/ethereum/go-ethereum/ethdb"
    25  	"github.com/ethereum/go-ethereum/rlp"
    26  	"github.com/ethereum/go-ethereum/trie"
    27  )
    28  
    29  // NewStateSync create a new state trie download scheduler.
    30  func NewStateSync(root common.Hash, database ethdb.KeyValueReader, bloom *trie.SyncBloom, onLeaf func(paths [][]byte, leaf []byte) error) *trie.Sync {
    31  	// Register the storage slot callback if the external callback is specified.
    32  	var onSlot func(paths [][]byte, hexpath []byte, leaf []byte, parent common.Hash) error
    33  	if onLeaf != nil {
    34  		onSlot = func(paths [][]byte, hexpath []byte, leaf []byte, parent common.Hash) error {
    35  			return onLeaf(paths, leaf)
    36  		}
    37  	}
    38  	// Register the account callback to connect the state trie and the storage
    39  	// trie belongs to the contract.
    40  	var syncer *trie.Sync
    41  	onAccount := func(paths [][]byte, hexpath []byte, leaf []byte, parent common.Hash) error {
    42  		if onLeaf != nil {
    43  			if err := onLeaf(paths, leaf); err != nil {
    44  				return err
    45  			}
    46  		}
    47  		var obj types.StateAccount
    48  		if err := rlp.Decode(bytes.NewReader(leaf), &obj); err != nil {
    49  			return err
    50  		}
    51  		syncer.AddSubTrie(obj.Root, hexpath, parent, onSlot)
    52  		syncer.AddCodeEntry(common.BytesToHash(obj.CodeHash), hexpath, parent)
    53  		return nil
    54  	}
    55  	syncer = trie.NewSync(root, database, onAccount, bloom)
    56  	return syncer
    57  }