Official Go implementation of the Ethereum protocol
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go-ethereum/trie/stacktrie.go

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// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package trie
import (
"errors"
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
)
var (
ErrCommitDisabled = errors.New("no database for committing")
stPool = sync.Pool{New: func() any { return new(stNode) }}
_ = types.TrieHasher((*StackTrie)(nil))
)
// NodeWriteFunc is used to provide all information of a dirty node for committing
// so that callers can flush nodes into database with desired scheme.
type NodeWriteFunc = func(owner common.Hash, path []byte, hash common.Hash, blob []byte)
// StackTrie is a trie implementation that expects keys to be inserted
// in order. Once it determines that a subtree will no longer be inserted
// into, it will hash it and free up the memory it uses.
type StackTrie struct {
owner common.Hash // the owner of the trie
writeFn NodeWriteFunc // function for committing nodes, can be nil
root *stNode
h *hasher
}
// NewStackTrie allocates and initializes an empty trie.
func NewStackTrie(writeFn NodeWriteFunc) *StackTrie {
return &StackTrie{
writeFn: writeFn,
root: stPool.Get().(*stNode),
h: newHasher(false),
}
}
// NewStackTrieWithOwner allocates and initializes an empty trie, but with
// the additional owner field.
func NewStackTrieWithOwner(writeFn NodeWriteFunc, owner common.Hash) *StackTrie {
stack := NewStackTrie(writeFn)
stack.owner = owner
return stack
}
// Update inserts a (key, value) pair into the stack trie.
func (t *StackTrie) Update(key, value []byte) error {
k := keybytesToHex(key)
if len(value) == 0 {
panic("deletion not supported")
}
t.insert(t.root, k[:len(k)-1], value, nil)
return nil
}
// MustUpdate is a wrapper of Update and will omit any encountered error but
// just print out an error message.
func (t *StackTrie) MustUpdate(key, value []byte) {
if err := t.Update(key, value); err != nil {
log.Error("Unhandled trie error in StackTrie.Update", "err", err)
}
}
func (t *StackTrie) Reset() {
t.writeFn = nil
t.root = stPool.Get().(*stNode)
}
// stNode represents a node within a StackTrie
type stNode struct {
typ uint8 // node type (as in branch, ext, leaf)
key []byte // key chunk covered by this (leaf|ext) node
val []byte // value contained by this node if it's a leaf
children [16]*stNode // list of children (for branch and exts)
}
// newLeaf constructs a leaf node with provided node key and value. The key
// will be deep-copied in the function and safe to modify afterwards, but
// value is not.
func newLeaf(key, val []byte) *stNode {
st := stPool.Get().(*stNode)
st.typ = leafNode
st.key = append(st.key, key...)
st.val = val
return st
}
// newExt constructs an extension node with provided node key and child. The
// key will be deep-copied in the function and safe to modify afterwards.
func newExt(key []byte, child *stNode) *stNode {
st := stPool.Get().(*stNode)
st.typ = extNode
st.key = append(st.key, key...)
st.children[0] = child
return st
}
// List all values that stNode#nodeType can hold
const (
emptyNode = iota
branchNode
extNode
leafNode
hashedNode
)
func (n *stNode) reset() *stNode {
n.key = n.key[:0]
n.val = nil
for i := range n.children {
n.children[i] = nil
}
n.typ = emptyNode
return n
}
// Helper function that, given a full key, determines the index
// at which the chunk pointed by st.keyOffset is different from
// the same chunk in the full key.
func (n *stNode) getDiffIndex(key []byte) int {
for idx, nibble := range n.key {
if nibble != key[idx] {
return idx
}
}
return len(n.key)
}
// Helper function to that inserts a (key, value) pair into
// the trie.
func (t *StackTrie) insert(st *stNode, key, value []byte, prefix []byte) {
switch st.typ {
case branchNode: /* Branch */
idx := int(key[0])
// Unresolve elder siblings
for i := idx - 1; i >= 0; i-- {
if st.children[i] != nil {
if st.children[i].typ != hashedNode {
t.hash(st.children[i], append(prefix, byte(i)))
}
break
}
}
// Add new child
if st.children[idx] == nil {
st.children[idx] = newLeaf(key[1:], value)
} else {
t.insert(st.children[idx], key[1:], value, append(prefix, key[0]))
}
case extNode: /* Ext */
// Compare both key chunks and see where they differ
diffidx := st.getDiffIndex(key)
// Check if chunks are identical. If so, recurse into
// the child node. Otherwise, the key has to be split
// into 1) an optional common prefix, 2) the fullnode
// representing the two differing path, and 3) a leaf
// for each of the differentiated subtrees.
if diffidx == len(st.key) {
// Ext key and key segment are identical, recurse into
// the child node.
t.insert(st.children[0], key[diffidx:], value, append(prefix, key[:diffidx]...))
return
}
// Save the original part. Depending if the break is
// at the extension's last byte or not, create an
// intermediate extension or use the extension's child
// node directly.
var n *stNode
if diffidx < len(st.key)-1 {
// Break on the non-last byte, insert an intermediate
// extension. The path prefix of the newly-inserted
// extension should also contain the different byte.
n = newExt(st.key[diffidx+1:], st.children[0])
t.hash(n, append(prefix, st.key[:diffidx+1]...))
} else {
// Break on the last byte, no need to insert
// an extension node: reuse the current node.
// The path prefix of the original part should
// still be same.
n = st.children[0]
t.hash(n, append(prefix, st.key...))
}
var p *stNode
if diffidx == 0 {
// the break is on the first byte, so
// the current node is converted into
// a branch node.
st.children[0] = nil
p = st
st.typ = branchNode
} else {
// the common prefix is at least one byte
// long, insert a new intermediate branch
// node.
st.children[0] = stPool.Get().(*stNode)
st.children[0].typ = branchNode
p = st.children[0]
}
// Create a leaf for the inserted part
o := newLeaf(key[diffidx+1:], value)
// Insert both child leaves where they belong:
origIdx := st.key[diffidx]
newIdx := key[diffidx]
p.children[origIdx] = n
p.children[newIdx] = o
st.key = st.key[:diffidx]
case leafNode: /* Leaf */
// Compare both key chunks and see where they differ
diffidx := st.getDiffIndex(key)
// Overwriting a key isn't supported, which means that
// the current leaf is expected to be split into 1) an
// optional extension for the common prefix of these 2
// keys, 2) a fullnode selecting the path on which the
// keys differ, and 3) one leaf for the differentiated
// component of each key.
if diffidx >= len(st.key) {
panic("Trying to insert into existing key")
}
// Check if the split occurs at the first nibble of the
// chunk. In that case, no prefix extnode is necessary.
// Otherwise, create that
var p *stNode
if diffidx == 0 {
// Convert current leaf into a branch
st.typ = branchNode
p = st
st.children[0] = nil
} else {
// Convert current node into an ext,
// and insert a child branch node.
st.typ = extNode
st.children[0] = stPool.Get().(*stNode)
st.children[0].typ = branchNode
p = st.children[0]
}
// Create the two child leaves: one containing the original
// value and another containing the new value. The child leaf
// is hashed directly in order to free up some memory.
origIdx := st.key[diffidx]
p.children[origIdx] = newLeaf(st.key[diffidx+1:], st.val)
t.hash(p.children[origIdx], append(prefix, st.key[:diffidx+1]...))
newIdx := key[diffidx]
p.children[newIdx] = newLeaf(key[diffidx+1:], value)
// Finally, cut off the key part that has been passed
// over to the children.
st.key = st.key[:diffidx]
st.val = nil
case emptyNode: /* Empty */
st.typ = leafNode
st.key = key
st.val = value
case hashedNode:
panic("trying to insert into hash")
default:
panic("invalid type")
}
}
// hash converts st into a 'hashedNode', if possible. Possible outcomes:
//
// 1. The rlp-encoded value was >= 32 bytes:
// - Then the 32-byte `hash` will be accessible in `st.val`.
// - And the 'st.type' will be 'hashedNode'
//
// 2. The rlp-encoded value was < 32 bytes
// - Then the <32 byte rlp-encoded value will be accessible in 'st.val'.
// - And the 'st.type' will be 'hashedNode' AGAIN
//
// This method also sets 'st.type' to hashedNode, and clears 'st.key'.
func (t *StackTrie) hash(st *stNode, path []byte) {
// The switch below sets this to the RLP-encoding of this node.
var encodedNode []byte
switch st.typ {
case hashedNode:
return
case emptyNode:
st.val = types.EmptyRootHash.Bytes()
st.key = st.key[:0]
st.typ = hashedNode
return
case branchNode:
var nodes fullNode
for i, child := range st.children {
if child == nil {
nodes.Children[i] = nilValueNode
continue
}
t.hash(child, append(path, byte(i)))
if len(child.val) < 32 {
nodes.Children[i] = rawNode(child.val)
} else {
nodes.Children[i] = hashNode(child.val)
}
st.children[i] = nil
stPool.Put(child.reset()) // Release child back to pool.
}
nodes.encode(t.h.encbuf)
encodedNode = t.h.encodedBytes()
case extNode:
t.hash(st.children[0], append(path, st.key...))
n := shortNode{Key: hexToCompactInPlace(st.key)}
if len(st.children[0].val) < 32 {
n.Val = rawNode(st.children[0].val)
} else {
n.Val = hashNode(st.children[0].val)
}
n.encode(t.h.encbuf)
encodedNode = t.h.encodedBytes()
stPool.Put(st.children[0].reset()) // Release child back to pool.
st.children[0] = nil
case leafNode:
st.key = append(st.key, byte(16))
n := shortNode{Key: hexToCompactInPlace(st.key), Val: valueNode(st.val)}
n.encode(t.h.encbuf)
encodedNode = t.h.encodedBytes()
default:
panic("invalid node type")
}
st.typ = hashedNode
st.key = st.key[:0]
if len(encodedNode) < 32 {
st.val = common.CopyBytes(encodedNode)
return
}
// Write the hash to the 'val'. We allocate a new val here to not mutate
// input values
st.val = t.h.hashData(encodedNode)
if t.writeFn != nil {
t.writeFn(t.owner, path, common.BytesToHash(st.val), encodedNode)
}
}
// Hash returns the hash of the current node.
func (t *StackTrie) Hash() (h common.Hash) {
st := t.root
t.hash(st, nil)
if len(st.val) == 32 {
copy(h[:], st.val)
return h
}
// If the node's RLP isn't 32 bytes long, the node will not
// be hashed, and instead contain the rlp-encoding of the
// node. For the top level node, we need to force the hashing.
t.h.sha.Reset()
t.h.sha.Write(st.val)
t.h.sha.Read(h[:])
return h
}
// Commit will firstly hash the entire trie if it's still not hashed
// and then commit all nodes to the associated database. Actually most
// of the trie nodes MAY have been committed already. The main purpose
// here is to commit the root node.
//
// The associated database is expected, otherwise the whole commit
// functionality should be disabled.
func (t *StackTrie) Commit() (h common.Hash, err error) {
if t.writeFn == nil {
return common.Hash{}, ErrCommitDisabled
}
st := t.root
t.hash(st, nil)
if len(st.val) == 32 {
copy(h[:], st.val)
return h, nil
}
// If the node's RLP isn't 32 bytes long, the node will not
// be hashed (and committed), and instead contain the rlp-encoding of the
// node. For the top level node, we need to force the hashing+commit.
t.h.sha.Reset()
t.h.sha.Write(st.val)
t.h.sha.Read(h[:])
t.writeFn(t.owner, nil, h, st.val)
return h, nil
}