121 lines
4.2 KiB
Go
121 lines
4.2 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/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/statediff/indexer/ipld"
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)
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// StateTrie wraps a trie with key hashing. In a secure trie, all
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// access operations hash the key using keccak256. This prevents
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// calling code from creating long chains of nodes that
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// increase the access time.
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//
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// Contrary to a regular trie, a StateTrie can only be created with
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// New and must have an attached database.
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//
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// StateTrie is not safe for concurrent use.
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type StateTrie struct {
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trie Trie
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hashKeyBuf [common.HashLength]byte
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}
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// NewStateTrie creates a trie with an existing root node from a backing database
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// and optional intermediate in-memory node pool.
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//
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// If root is the zero hash or the sha3 hash of an empty string, the
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// trie is initially empty. Otherwise, New will panic if db is nil
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// and returns MissingNodeError if the root node cannot be found.
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//
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// Accessing the trie loads nodes from the database or node pool on demand.
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// Loaded nodes are kept around until their 'cache generation' expires.
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// A new cache generation is created by each call to Commit.
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// cachelimit sets the number of past cache generations to keep.
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//
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// Retrieves IPLD blocks by CID encoded as "eth-state-trie"
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func NewStateTrie(owner common.Hash, root common.Hash, db *Database) (*StateTrie, error) {
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return newStateTrie(owner, root, db, ipld.MEthStateTrie)
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}
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// NewStorageTrie is identical to NewStateTrie, but retrieves IPLD blocks encoded
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// as "eth-storage-trie"
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func NewStorageTrie(owner common.Hash, root common.Hash, db *Database) (*StateTrie, error) {
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return newStateTrie(owner, root, db, ipld.MEthStorageTrie)
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}
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func newStateTrie(owner common.Hash, root common.Hash, db *Database, codec uint64) (*StateTrie, error) {
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if db == nil {
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panic("NewStateTrie called without a database")
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}
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trie, err := New(owner, root, db, codec)
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if err != nil {
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return nil, err
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}
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return &StateTrie{trie: *trie}, nil
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}
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// TryGet returns the value for key stored in the trie.
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// The value bytes must not be modified by the caller.
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// If a node was not found in the database, a MissingNodeError is returned.
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func (t *StateTrie) TryGet(key []byte) ([]byte, error) {
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return t.trie.TryGet(t.hashKey(key))
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}
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func (t *StateTrie) TryGetAccount(key []byte) (*types.StateAccount, error) {
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var ret types.StateAccount
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res, err := t.TryGet(key)
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if err != nil {
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// log.Error(fmt.Sprintf("Unhandled trie error: %v", err))
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panic(fmt.Sprintf("Unhandled trie error: %v", err))
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return &ret, err
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}
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if res == nil {
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return nil, nil
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}
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err = rlp.DecodeBytes(res, &ret)
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return &ret, err
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}
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// Hash returns the root hash of StateTrie. It does not write to the
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// database and can be used even if the trie doesn't have one.
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func (t *StateTrie) Hash() common.Hash {
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return t.trie.Hash()
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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 *StateTrie) NodeIterator(start []byte) NodeIterator {
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return t.trie.NodeIterator(start)
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}
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// hashKey returns the hash of key as an ephemeral buffer.
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// The caller must not hold onto the return value because it will become
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// invalid on the next call to hashKey or secKey.
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func (t *StateTrie) hashKey(key []byte) []byte {
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h := newHasher(false)
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h.sha.Reset()
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h.sha.Write(key)
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h.sha.Read(t.hashKeyBuf[:])
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returnHasherToPool(h)
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return t.hashKeyBuf[:]
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}
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