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https://github.com/ethereum/go-ethereum.git
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bd4b17907f
Implement the binary tree as specified in [eip-7864](https://eips.ethereum.org/EIPS/eip-7864). This will gradually replace verkle trees in the codebase. This is only running the tests and will not be executed in production, but will help me rebase some of my work, so that it doesn't bitrot as much. --------- Signed-off-by: Guillaume Ballet Co-authored-by: Parithosh Jayanthi <parithosh.jayanthi@ethereum.org> Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
72 lines
2.7 KiB
Go
72 lines
2.7 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package trie
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/triedb/database"
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)
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// Reader is a wrapper of the underlying database reader. It's not safe
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// for concurrent usage.
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type Reader struct {
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owner common.Hash
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reader database.NodeReader
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banned map[string]struct{} // Marker to prevent node from being accessed, for tests
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}
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// NewReader initializes the trie reader with the given database reader.
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func NewReader(stateRoot, owner common.Hash, db database.NodeDatabase) (*Reader, error) {
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if stateRoot == (common.Hash{}) || stateRoot == types.EmptyRootHash {
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return &Reader{owner: owner}, nil
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}
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reader, err := db.NodeReader(stateRoot)
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if err != nil {
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return nil, &MissingNodeError{Owner: owner, NodeHash: stateRoot, err: err}
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}
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return &Reader{owner: owner, reader: reader}, nil
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}
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// newEmptyReader initializes the pure in-memory reader. All read operations
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// should be forbidden and returns the MissingNodeError.
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func newEmptyReader() *Reader {
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return &Reader{}
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}
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// Node retrieves the rlp-encoded trie node with the provided trie node
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// information. An MissingNodeError will be returned in case the node is
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// not found or any error is encountered.
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//
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// Don't modify the returned byte slice since it's not deep-copied and
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// still be referenced by database.
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func (r *Reader) Node(path []byte, hash common.Hash) ([]byte, error) {
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// Perform the logics in tests for preventing trie node access.
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if r.banned != nil {
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if _, ok := r.banned[string(path)]; ok {
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return nil, &MissingNodeError{Owner: r.owner, NodeHash: hash, Path: path}
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}
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}
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if r.reader == nil {
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return nil, &MissingNodeError{Owner: r.owner, NodeHash: hash, Path: path}
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}
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blob, err := r.reader.Node(r.owner, path, hash)
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if err != nil || len(blob) == 0 {
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return nil, &MissingNodeError{Owner: r.owner, NodeHash: hash, Path: path, err: err}
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}
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return blob, nil
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}
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