273 lines
9.4 KiB
Go
273 lines
9.4 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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"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/log"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// SecureTrie is the old name of StateTrie.
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// Deprecated: use StateTrie.
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type SecureTrie = StateTrie
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// NewSecure creates a new StateTrie.
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// Deprecated: use NewStateTrie.
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func NewSecure(stateRoot common.Hash, owner common.Hash, root common.Hash, db *Database) (*SecureTrie, error) {
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id := &ID{
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StateRoot: stateRoot,
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Owner: owner,
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Root: root,
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}
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return NewStateTrie(id, db)
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}
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// StateTrie wraps a trie with key hashing. In a stateTrie 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. The database also stores
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// the preimage of each key if preimage recording is enabled.
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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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preimages *preimageStore
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hashKeyBuf [common.HashLength]byte
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secKeyCache map[string][]byte
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secKeyCacheOwner *StateTrie // Pointer to self, replace the key cache on mismatch
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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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//
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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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func NewStateTrie(id *ID, db *Database) (*StateTrie, error) {
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if db == nil {
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panic("trie.NewStateTrie called without a database")
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}
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trie, err := New(id, db)
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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, preimages: db.preimages}, nil
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}
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// Get 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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func (t *StateTrie) Get(key []byte) []byte {
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res, err := t.TryGet(key)
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if err != nil {
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log.Error("Unhandled trie error in StateTrie.Get", "err", err)
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}
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return res
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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 the specified node is not in the trie, nil will be returned.
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// If a trie node is 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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// TryGetAccount attempts to retrieve an account with provided trie path.
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// If the specified account is not in the trie, nil will be returned.
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// If a trie node is not found in the database, a MissingNodeError is returned.
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func (t *StateTrie) TryGetAccount(key []byte) (*types.StateAccount, error) {
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res, err := t.trie.TryGet(t.hashKey(key))
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if res == nil || err != nil {
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return nil, err
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}
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ret := new(types.StateAccount)
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err = rlp.DecodeBytes(res, ret)
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return ret, err
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}
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// TryGetAccountWithPreHashedKey does the same thing as TryGetAccount, however
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// it expects a key that is already hashed. This constitutes an abstraction leak,
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// since the client code needs to know the key format.
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func (t *StateTrie) TryGetAccountWithPreHashedKey(key []byte) (*types.StateAccount, error) {
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res, err := t.trie.TryGet(key)
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if res == nil || err != nil {
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return nil, err
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}
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ret := new(types.StateAccount)
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err = rlp.DecodeBytes(res, ret)
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return ret, err
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}
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// TryGetNode attempts to retrieve a trie node by compact-encoded path. It is not
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// possible to use keybyte-encoding as the path might contain odd nibbles.
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// If the specified trie node is not in the trie, nil will be returned.
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// If a trie node is not found in the database, a MissingNodeError is returned.
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func (t *StateTrie) TryGetNode(path []byte) ([]byte, int, error) {
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return t.trie.TryGetNode(path)
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}
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// Update associates key with value in the trie. Subsequent calls to
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// Get will return value. If value has length zero, any existing value
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// is deleted from the trie and calls to Get will return nil.
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//
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// The value bytes must not be modified by the caller while they are
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// stored in the trie.
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func (t *StateTrie) Update(key, value []byte) {
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if err := t.TryUpdate(key, value); err != nil {
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log.Error("Unhandled trie error in StateTrie.Update", "err", err)
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}
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}
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// TryUpdate associates key with value in the trie. Subsequent calls to
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// Get will return value. If value has length zero, any existing value
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// is deleted from the trie and calls to Get will return nil.
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//
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// The value bytes must not be modified by the caller while they are
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// stored in the trie.
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//
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// If a node is not found in the database, a MissingNodeError is returned.
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func (t *StateTrie) TryUpdate(key, value []byte) error {
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hk := t.hashKey(key)
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err := t.trie.TryUpdate(hk, value)
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if err != nil {
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return err
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}
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t.getSecKeyCache()[string(hk)] = common.CopyBytes(key)
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return nil
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}
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// TryUpdateAccount account will abstract the write of an account to the
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// secure trie.
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func (t *StateTrie) TryUpdateAccount(key []byte, acc *types.StateAccount) error {
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hk := t.hashKey(key)
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data, err := rlp.EncodeToBytes(acc)
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if err != nil {
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return err
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}
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if err := t.trie.TryUpdate(hk, data); err != nil {
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return err
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}
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t.getSecKeyCache()[string(hk)] = common.CopyBytes(key)
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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 *StateTrie) Delete(key []byte) {
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if err := t.TryDelete(key); err != nil {
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log.Error("Unhandled trie error in StateTrie.Delete", "err", err)
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}
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}
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// TryDelete removes any existing value for key from the trie.
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// If the specified trie node is not in the trie, nothing will be changed.
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// If a node is not found in the database, a MissingNodeError is returned.
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func (t *StateTrie) TryDelete(key []byte) error {
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hk := t.hashKey(key)
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delete(t.getSecKeyCache(), string(hk))
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return t.trie.TryDelete(hk)
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}
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// TryDeleteAccount abstracts an account deletion from the trie.
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func (t *StateTrie) TryDeleteAccount(key []byte) error {
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hk := t.hashKey(key)
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delete(t.getSecKeyCache(), string(hk))
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return t.trie.TryDelete(hk)
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}
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// GetKey returns the sha3 preimage of a hashed key that was
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// previously used to store a value.
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func (t *StateTrie) GetKey(shaKey []byte) []byte {
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if key, ok := t.getSecKeyCache()[string(shaKey)]; ok {
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return key
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}
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if t.preimages == nil {
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return nil
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}
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return t.preimages.preimage(common.BytesToHash(shaKey))
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}
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// Commit collects all dirty nodes in the trie and replaces them with the
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// corresponding node hash. All collected nodes (including dirty leaves if
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// collectLeaf is true) will be encapsulated into a nodeset for return.
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// The returned nodeset can be nil if the trie is clean (nothing to commit).
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// All cached preimages will be also flushed if preimages recording is enabled.
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// Once the trie is committed, it's not usable anymore. A new trie must
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// be created with new root and updated trie database for following usage
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func (t *StateTrie) Commit(collectLeaf bool) (common.Hash, *NodeSet, error) {
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// Write all the pre-images to the actual disk database
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if len(t.getSecKeyCache()) > 0 {
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if t.preimages != nil {
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preimages := make(map[common.Hash][]byte)
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for hk, key := range t.secKeyCache {
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preimages[common.BytesToHash([]byte(hk))] = key
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}
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t.preimages.insertPreimage(preimages)
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}
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t.secKeyCache = make(map[string][]byte)
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}
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// Commit the trie and return its modified nodeset.
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return t.trie.Commit(collectLeaf)
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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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// Copy returns a copy of StateTrie.
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func (t *StateTrie) Copy() *StateTrie {
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return &StateTrie{
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trie: *t.trie.Copy(),
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preimages: t.preimages,
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secKeyCache: t.secKeyCache,
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}
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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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// getSecKeyCache returns the current secure key cache, creating a new one if
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// ownership changed (i.e. the current secure trie is a copy of another owning
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// the actual cache).
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func (t *StateTrie) getSecKeyCache() map[string][]byte {
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if t != t.secKeyCacheOwner {
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t.secKeyCacheOwner = t
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t.secKeyCache = make(map[string][]byte)
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}
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return t.secKeyCache
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}
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