102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
// Copyright 2015 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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"fmt"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/log"
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)
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type EmptyTrie struct{}
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func (t *EmptyTrie) Prove(key []byte, fromLevel uint, proofDb ethdb.KeyValueWriter) error {
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return nil
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}
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// NewSecure creates a dummy trie
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func NewEmptyTrie() *EmptyTrie {
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return &EmptyTrie{}
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}
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func (t *EmptyTrie) Get(key []byte) []byte {
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return nil
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}
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func (t *EmptyTrie) TryGet(key []byte) ([]byte, error) {
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return nil, nil
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}
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func (t *EmptyTrie) TryGetNode(path []byte) ([]byte, int, error) {
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return nil, 0, nil
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}
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func (t *EmptyTrie) Update(key, value []byte) {}
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func (t *EmptyTrie) TryUpdate(key, value []byte) error {
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return nil
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}
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// Delete removes any existing value for key from the trie.
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func (t *EmptyTrie) Delete(key []byte) {
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if err := t.TryDelete(key); err != nil {
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log.Error(fmt.Sprintf("Unhandled trie error: %v", err))
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}
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}
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func (t *EmptyTrie) TryDelete(key []byte) error {
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return nil
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}
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func (t *EmptyTrie) GetKey(shaKey []byte) []byte {
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return nil
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}
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func (t *EmptyTrie) Commit(onleaf LeafCallback) (root common.Hash, committed int, err error) {
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return common.Hash{}, 0, nil
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}
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func (t *EmptyTrie) Hash() common.Hash {
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return common.Hash{}
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}
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// Copy returns a copy of SecureTrie.
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func (t *EmptyTrie) Copy() *EmptyTrie {
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cpy := *t
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return &cpy
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}
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func (t *EmptyTrie) ResetCopy() *EmptyTrie {
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cpy := *t
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return &cpy
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}
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// NodeIterator returns an iterator that returns nodes of the underlying trie. Iteration
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// starts at the key after the given start key.
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func (t *EmptyTrie) NodeIterator(start []byte) NodeIterator {
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return nil
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}
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// TryUpdateAccount abstract an account write in the trie.
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func (t *EmptyTrie) TryUpdateAccount(key []byte, account *types.StateAccount) error {
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return nil
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}
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