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trie, core/state: improve memory usage and performance (#3135)

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* trie: store nodes as pointers

This avoids memory copies when unwrapping node interface values.

name      old time/op  new time/op  delta
Get        388ns ± 8%   215ns ± 2%  -44.56%  (p=0.000 n=15+15)
GetDB      363ns ± 3%   202ns ± 2%  -44.21%  (p=0.000 n=15+15)
UpdateBE  1.57µs ± 2%  1.29µs ± 3%  -17.80%  (p=0.000 n=13+15)
UpdateLE  1.92µs ± 2%  1.61µs ± 2%  -16.25%  (p=0.000 n=14+14)
HashBE    2.16µs ± 6%  2.18µs ± 6%     ~     (p=0.436 n=15+15)
HashLE    7.43µs ± 3%  7.21µs ± 3%   -2.96%  (p=0.000 n=15+13)

* trie: close temporary databases in GetDB benchmark

* trie: don't keep []byte from DB load around

Nodes decoded from a DB load kept hashes and values as sub-slices of
the DB value. This can be a problem because loading from leveldb often
returns []byte with a cap that's larger than necessary, increasing
memory usage.

* trie: unload old cached nodes

* trie, core/state: use cache unloading for account trie

* trie: use explicit private flags (fixes Go 1.5 reflection issue).

* trie: fixup cachegen overflow at request of nick

* core/state: rename journal size constant
This commit is contained in:
Felix Lange 2016-10-14 18:04:33 +02:00 committed by Péter Szilágyi
parent c2ddfb343a
commit 40cdcf1183
15 changed files with 249 additions and 142 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
core/blockchain.go
View File

@ -269,7 +269,7 @@ func (self *BlockChain) FastSyncCommitHead(hash common.Hash) error {
if block == nil {
return fmt.Errorf("non existent block [%x…]", hash[:4])
}
if _, err := trie.NewSecure(block.Root(), self.chainDb); err != nil {
if _, err := trie.NewSecure(block.Root(), self.chainDb, 0); err != nil {
return err
}
// If all checks out, manually set the head block

4
core/state/state_object.go
View File

@ -137,9 +137,9 @@ func (self *StateObject) markSuicided() {
func (c *StateObject) getTrie(db trie.Database) *trie.SecureTrie {
if c.trie == nil {
var err error
c.trie, err = trie.NewSecure(c.data.Root, db)
c.trie, err = trie.NewSecure(c.data.Root, db, 0)
if err != nil {
c.trie, _ = trie.NewSecure(common.Hash{}, db)
c.trie, _ = trie.NewSecure(common.Hash{}, db, 0)
c.setError(fmt.Errorf("can't create storage trie: %v", err))
}
}

11
core/state/statedb.go
View File

@ -41,7 +41,10 @@ var StartingNonce uint64
const (
// Number of past tries to keep. The arbitrarily chosen value here
// is max uncle depth + 1.
maxTrieCacheLength = 8
maxPastTries = 8
// Trie cache generation limit.
maxTrieCacheGen = 100
// Number of codehash->size associations to keep.
codeSizeCacheSize = 100000
@ -86,7 +89,7 @@ type StateDB struct {
// Create a new state from a given trie
func New(root common.Hash, db ethdb.Database) (*StateDB, error) {
tr, err := trie.NewSecure(root, db)
tr, err := trie.NewSecure(root, db, maxTrieCacheGen)
if err != nil {
return nil, err
}
@ -155,14 +158,14 @@ func (self *StateDB) openTrie(root common.Hash) (*trie.SecureTrie, error) {
return &tr, nil
}
}
return trie.NewSecure(root, self.db)
return trie.NewSecure(root, self.db, maxTrieCacheGen)
}
func (self *StateDB) pushTrie(t *trie.SecureTrie) {
self.lock.Lock()
defer self.lock.Unlock()
if len(self.pastTries) >= maxTrieCacheLength {
if len(self.pastTries) >= maxPastTries {
copy(self.pastTries, self.pastTries[1:])
self.pastTries[len(self.pastTries)-1] = t
} else {

2
eth/downloader/downloader_test.go
View File

@ -286,7 +286,7 @@ func (dl *downloadTester) headFastBlock() *types.Block {
func (dl *downloadTester) commitHeadBlock(hash common.Hash) error {
// For now only check that the state trie is correct
if block := dl.getBlock(hash); block != nil {
_, err := trie.NewSecure(block.Root(), dl.stateDb)
_, err := trie.NewSecure(block.Root(), dl.stateDb, 0)
return err
}
return fmt.Errorf("non existent block: %x", hash[:4])

6
light/trie.go
View File

@ -79,7 +79,7 @@ func (t *LightTrie) do(ctx context.Context, fallbackKey []byte, fn func() error)
func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
t.trie, err = trie.NewSecure(t.originalRoot, t.db, 0)
}
if err == nil {
res, err = t.trie.TryGet(key)
@ -98,7 +98,7 @@ func (t *LightTrie) Get(ctx context.Context, key []byte) (res []byte, err error)
func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
t.trie, err = trie.NewSecure(t.originalRoot, t.db, 0)
}
if err == nil {
err = t.trie.TryUpdate(key, value)
@ -112,7 +112,7 @@ func (t *LightTrie) Update(ctx context.Context, key, value []byte) (err error) {
func (t *LightTrie) Delete(ctx context.Context, key []byte) (err error) {
err = t.do(ctx, key, func() (err error) {
if t.trie == nil {
t.trie, err = trie.NewSecure(t.originalRoot, t.db)
t.trie, err = trie.NewSecure(t.originalRoot, t.db, 0)
}
if err == nil {
err = t.trie.TryDelete(key)

78
trie/hasher.go
View File

@ -27,8 +27,9 @@ import (
)
type hasher struct {
tmp *bytes.Buffer
sha hash.Hash
tmp *bytes.Buffer
sha hash.Hash
cachegen, cachelimit uint16
}
// hashers live in a global pool.
@ -38,8 +39,10 @@ var hasherPool = sync.Pool{
},
}
func newHasher() *hasher {
return hasherPool.Get().(*hasher)
func newHasher(cachegen, cachelimit uint16) *hasher {
h := hasherPool.Get().(*hasher)
h.cachegen, h.cachelimit = cachegen, cachelimit
return h
}
func returnHasherToPool(h *hasher) {
@ -50,8 +53,18 @@ func returnHasherToPool(h *hasher) {
// original node initialzied with the computed hash to replace the original one.
func (h *hasher) hash(n node, db DatabaseWriter, force bool) (node, node, error) {
// If we're not storing the node, just hashing, use avaialble cached data
if hash, dirty := n.cache(); hash != nil && (db == nil || !dirty) {
return hash, n, nil
if hash, dirty := n.cache(); hash != nil {
if db == nil {
return hash, n, nil
}
if n.canUnload(h.cachegen, h.cachelimit) {
// Evict the node from cache. All of its subnodes will have a lower or equal
// cache generation number.
return hash, hash, nil
}
if !dirty {
return hash, n, nil
}
}
// Trie not processed yet or needs storage, walk the children
collapsed, cached, err := h.hashChildren(n, db)
@ -62,19 +75,21 @@ func (h *hasher) hash(n node, db DatabaseWriter, force bool) (node, node, error)
if err != nil {
return hashNode{}, n, err
}
// Cache the hash and RLP blob of the ndoe for later reuse
// Cache the hash of the ndoe for later reuse.
if hash, ok := hashed.(hashNode); ok && !force {
switch cached := cached.(type) {
case shortNode:
cached.hash = hash
case *shortNode:
cached = cached.copy()
cached.flags.hash = hash
if db != nil {
cached.dirty = false
cached.flags.dirty = false
}
return hashed, cached, nil
case fullNode:
cached.hash = hash
case *fullNode:
cached = cached.copy()
cached.flags.hash = hash
if db != nil {
cached.dirty = false
cached.flags.dirty = false
}
return hashed, cached, nil
}
@ -89,40 +104,42 @@ func (h *hasher) hashChildren(original node, db DatabaseWriter) (node, node, err
var err error
switch n := original.(type) {
case shortNode:
case *shortNode:
// Hash the short node's child, caching the newly hashed subtree
cached := n
cached.Key = common.CopyBytes(cached.Key)
collapsed, cached := n.copy(), n.copy()
collapsed.Key = compactEncode(n.Key)
cached.Key = common.CopyBytes(n.Key)
n.Key = compactEncode(n.Key)
if _, ok := n.Val.(valueNode); !ok {
if n.Val, cached.Val, err = h.hash(n.Val, db, false); err != nil {
return n, original, err
collapsed.Val, cached.Val, err = h.hash(n.Val, db, false)
if err != nil {
return original, original, err
}
}
if n.Val == nil {
n.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
if collapsed.Val == nil {
collapsed.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
}
return n, cached, nil
return collapsed, cached, nil
case fullNode:
case *fullNode:
// Hash the full node's children, caching the newly hashed subtrees
cached := fullNode{dirty: n.dirty}
collapsed, cached := n.copy(), n.copy()
for i := 0; i < 16; i++ {
if n.Children[i] != nil {
if n.Children[i], cached.Children[i], err = h.hash(n.Children[i], db, false); err != nil {
return n, original, err
collapsed.Children[i], cached.Children[i], err = h.hash(n.Children[i], db, false)
if err != nil {
return original, original, err
}
} else {
n.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
collapsed.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
}
}
cached.Children[16] = n.Children[16]
if n.Children[16] == nil {
n.Children[16] = valueNode(nil)
if collapsed.Children[16] == nil {
collapsed.Children[16] = valueNode(nil)
}
return n, cached, nil
return collapsed, cached, nil
default:
// Value and hash nodes don't have children so they're left as were
@ -140,6 +157,7 @@ func (h *hasher) store(n node, db DatabaseWriter, force bool) (node, error) {
if err := rlp.Encode(h.tmp, n); err != nil {
panic("encode error: " + err.Error())
}
if h.tmp.Len() < 32 && !force {
return n, nil // Nodes smaller than 32 bytes are stored inside their parent
}

12
trie/iterator.go
View File

@ -56,11 +56,11 @@ func (it *Iterator) makeKey() []byte {
key := it.keyBuf[:0]
for _, se := range it.nodeIt.stack {
switch node := se.node.(type) {
case fullNode:
case *fullNode:
if se.child <= 16 {
key = append(key, byte(se.child))
}
case shortNode:
case *shortNode:
if hasTerm(node.Key) {
key = append(key, node.Key[:len(node.Key)-1]...)
} else {
@ -148,7 +148,7 @@ func (it *NodeIterator) step() error {
if (ancestor == common.Hash{}) {
ancestor = parent.parent
}
if node, ok := parent.node.(fullNode); ok {
if node, ok := parent.node.(*fullNode); ok {
// Full node, traverse all children, then the node itself
if parent.child >= len(node.Children) {
break
@ -156,7 +156,7 @@ func (it *NodeIterator) step() error {
for parent.child++; parent.child < len(node.Children); parent.child++ {
if current := node.Children[parent.child]; current != nil {
it.stack = append(it.stack, &nodeIteratorState{
hash: common.BytesToHash(node.hash),
hash: common.BytesToHash(node.flags.hash),
node: current,
parent: ancestor,
child: -1,
@ -164,14 +164,14 @@ func (it *NodeIterator) step() error {
break
}
}
} else if node, ok := parent.node.(shortNode); ok {
} else if node, ok := parent.node.(*shortNode); ok {
// Short node, traverse the pointer singleton child, then the node itself
if parent.child >= 0 {
break
}
parent.child++
it.stack = append(it.stack, &nodeIteratorState{
hash: common.BytesToHash(node.hash),
hash: common.BytesToHash(node.flags.hash),
node: node.Val,
parent: ancestor,
child: -1,

63
trie/node.go
View File

@ -30,42 +30,60 @@ var indices = []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b
type node interface {
fstring(string) string
cache() (hashNode, bool)
canUnload(cachegen, cachelimit uint16) bool
}
type (
fullNode struct {
Children [17]node // Actual trie node data to encode/decode (needs custom encoder)
hash hashNode // Cached hash of the node to prevent rehashing (may be nil)
dirty bool // Cached flag whether the node's new or already stored
flags nodeFlag
}
shortNode struct {
Key []byte
Val node
hash hashNode // Cached hash of the node to prevent rehashing (may be nil)
dirty bool // Cached flag whether the node's new or already stored
flags nodeFlag
}
hashNode []byte
valueNode []byte
)
// EncodeRLP encodes a full node into the consensus RLP format.
func (n fullNode) EncodeRLP(w io.Writer) error {
func (n *fullNode) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, n.Children)
}
// Cache accessors to retrieve precalculated values (avoid lengthy type switches).
func (n fullNode) cache() (hashNode, bool) { return n.hash, n.dirty }
func (n shortNode) cache() (hashNode, bool) { return n.hash, n.dirty }
func (n hashNode) cache() (hashNode, bool) { return nil, true }
func (n valueNode) cache() (hashNode, bool) { return nil, true }
func (n *fullNode) copy() *fullNode { copy := *n; return &copy }
func (n *shortNode) copy() *shortNode { copy := *n; return &copy }
// nodeFlag contains caching-related metadata about a node.
type nodeFlag struct {
hash hashNode // cached hash of the node (may be nil)
gen uint16 // cache generation counter
dirty bool // whether the node has changes that must be written to the database
}
// canUnload tells whether a node can be unloaded.
func (n *nodeFlag) canUnload(cachegen, cachelimit uint16) bool {
return !n.dirty && cachegen-n.gen >= cachelimit
}
func (n *fullNode) canUnload(gen, limit uint16) bool { return n.flags.canUnload(gen, limit) }
func (n *shortNode) canUnload(gen, limit uint16) bool { return n.flags.canUnload(gen, limit) }
func (n hashNode) canUnload(uint16, uint16) bool { return false }
func (n valueNode) canUnload(uint16, uint16) bool { return false }
func (n *fullNode) cache() (hashNode, bool) { return n.flags.hash, n.flags.dirty }
func (n *shortNode) cache() (hashNode, bool) { return n.flags.hash, n.flags.dirty }
func (n hashNode) cache() (hashNode, bool) { return nil, true }
func (n valueNode) cache() (hashNode, bool) { return nil, true }
// Pretty printing.
func (n fullNode) String() string { return n.fstring("") }
func (n shortNode) String() string { return n.fstring("") }
func (n hashNode) String() string { return n.fstring("") }
func (n valueNode) String() string { return n.fstring("") }
func (n *fullNode) String() string { return n.fstring("") }
func (n *shortNode) String() string { return n.fstring("") }
func (n hashNode) String() string { return n.fstring("") }
func (n valueNode) String() string { return n.fstring("") }
func (n fullNode) fstring(ind string) string {
func (n *fullNode) fstring(ind string) string {
resp := fmt.Sprintf("[\n%s ", ind)
for i, node := range n.Children {
if node == nil {
@ -76,7 +94,7 @@ func (n fullNode) fstring(ind string) string {
}
return resp + fmt.Sprintf("\n%s] ", ind)
}
func (n shortNode) fstring(ind string) string {
func (n *shortNode) fstring(ind string) string {
return fmt.Sprintf("{%x: %v} ", n.Key, n.Val.fstring(ind+" "))
}
func (n hashNode) fstring(ind string) string {
@ -120,6 +138,7 @@ func decodeShort(hash, buf, elems []byte) (node, error) {
if err != nil {
return nil, err
}
flag := nodeFlag{hash: hash}
key := compactDecode(kbuf)
if key[len(key)-1] == 16 {
// value node
@ -127,17 +146,17 @@ func decodeShort(hash, buf, elems []byte) (node, error) {
if err != nil {
return nil, fmt.Errorf("invalid value node: %v", err)
}
return shortNode{key, valueNode(val), hash, false}, nil
return &shortNode{key, append(valueNode{}, val...), flag}, nil
}
r, _, err := decodeRef(rest)
if err != nil {
return nil, wrapError(err, "val")
}
return shortNode{key, r, hash, false}, nil
return &shortNode{key, r, flag}, nil
}
func decodeFull(hash, buf, elems []byte) (fullNode, error) {
n := fullNode{hash: hash}
func decodeFull(hash, buf, elems []byte) (*fullNode, error) {
n := &fullNode{flags: nodeFlag{hash: hash}}
for i := 0; i < 16; i++ {
cld, rest, err := decodeRef(elems)
if err != nil {
@ -150,7 +169,7 @@ func decodeFull(hash, buf, elems []byte) (fullNode, error) {
return n, err
}
if len(val) > 0 {
n.Children[16] = valueNode(val)
n.Children[16] = append(valueNode{}, val...)
}
return n, nil
}
@ -176,7 +195,7 @@ func decodeRef(buf []byte) (node, []byte, error) {
// empty node
return nil, rest, nil
case kind == rlp.String && len(val) == 32:
return hashNode(val), rest, nil
return append(hashNode{}, val...), rest, nil
default:
return nil, nil, fmt.Errorf("invalid RLP string size %d (want 0 or 32)", len(val))
}

58
trie/node_test.go Normal file
View File

@ -0,0 +1,58 @@
// Copyright 2016 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 "testing"
func TestCanUnload(t *testing.T) {
tests := []struct {
flag nodeFlag
cachegen, cachelimit uint16
want bool
}{
{
flag: nodeFlag{dirty: true, gen: 0},
want: false,
},
{
flag: nodeFlag{dirty: false, gen: 0},
cachegen: 0, cachelimit: 0,
want: true,
},
{
flag: nodeFlag{dirty: false, gen: 65534},
cachegen: 65535, cachelimit: 1,
want: true,
},
{
flag: nodeFlag{dirty: false, gen: 65534},
cachegen: 0, cachelimit: 1,
want: true,
},
{
flag: nodeFlag{dirty: false, gen: 1},
cachegen: 65535, cachelimit: 1,
want: true,
},
}
for _, test := range tests {
if got := test.flag.canUnload(test.cachegen, test.cachelimit); got != test.want {
t.Errorf("%+v\n got %t, want %t", test, got, test.want)
}
}
}

10
trie/proof.go
View File

@ -44,7 +44,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
tn := t.root
for len(key) > 0 && tn != nil {
switch n := tn.(type) {
case shortNode:
case *shortNode:
if len(key) < len(n.Key) || !bytes.Equal(n.Key, key[:len(n.Key)]) {
// The trie doesn't contain the key.
tn = nil
@ -53,7 +53,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
key = key[len(n.Key):]
}
nodes = append(nodes, n)
case fullNode:
case *fullNode:
tn = n.Children[key[0]]
key = key[1:]
nodes = append(nodes, n)
@ -70,7 +70,7 @@ func (t *Trie) Prove(key []byte) []rlp.RawValue {
panic(fmt.Sprintf("%T: invalid node: %v", tn, tn))
}
}
hasher := newHasher()
hasher := newHasher(0, 0)
proof := make([]rlp.RawValue, 0, len(nodes))
for i, n := range nodes {
// Don't bother checking for errors here since hasher panics
@ -130,13 +130,13 @@ func VerifyProof(rootHash common.Hash, key []byte, proof []rlp.RawValue) (value
func get(tn node, key []byte) ([]byte, node) {
for len(key) > 0 {
switch n := tn.(type) {
case shortNode:
case *shortNode:
if len(key) < len(n.Key) || !bytes.Equal(n.Key, key[:len(n.Key)]) {
return nil, nil
}
tn = n.Val
key = key[len(n.Key):]
case fullNode:
case *fullNode:
tn = n.Children[key[0]]
key = key[1:]
case hashNode:

13
trie/secure_trie.go
View File

@ -49,8 +49,12 @@ type SecureTrie struct {
// If root is the zero hash or the sha3 hash of an empty string, the
// trie is initially empty. Otherwise, New will panic if db is nil
// and returns MissingNodeError if the root node cannot be found.
//
// Accessing the trie loads nodes from db on demand.
func NewSecure(root common.Hash, db Database) (*SecureTrie, error) {
// Loaded nodes are kept around until their 'cache generation' expires.
// A new cache generation is created by each call to Commit.
// cachelimit sets the number of past cache generations to keep.
func NewSecure(root common.Hash, db Database, cachelimit uint16) (*SecureTrie, error) {
if db == nil {
panic("NewSecure called with nil database")
}
@ -58,9 +62,8 @@ func NewSecure(root common.Hash, db Database) (*SecureTrie, error) {
if err != nil {
return nil, err
}
return &SecureTrie{
trie: *trie,
}, nil
trie.SetCacheLimit(cachelimit)
return &SecureTrie{trie: *trie}, nil
}
// Get returns the value for key stored in the trie.
@ -191,7 +194,7 @@ func (t *SecureTrie) secKey(key []byte) []byte {
// The caller must not hold onto the return value because it will become
// invalid on the next call to hashKey or secKey.
func (t *SecureTrie) hashKey(key []byte) []byte {
h := newHasher()
h := newHasher(0, 0)
h.sha.Reset()
h.sha.Write(key)
buf := h.sha.Sum(t.hashKeyBuf[:0])

4
trie/secure_trie_test.go
View File

@ -29,7 +29,7 @@ import (
func newEmptySecure() *SecureTrie {
db, _ := ethdb.NewMemDatabase()
trie, _ := NewSecure(common.Hash{}, db)
trie, _ := NewSecure(common.Hash{}, db, 0)
return trie
}
@ -37,7 +37,7 @@ func newEmptySecure() *SecureTrie {
func makeTestSecureTrie() (ethdb.Database, *SecureTrie, map[string][]byte) {
// Create an empty trie
db, _ := ethdb.NewMemDatabase()
trie, _ := NewSecure(common.Hash{}, db)
trie, _ := NewSecure(common.Hash{}, db, 0)
// Fill it with some arbitrary data
content := make(map[string][]byte)

4
trie/sync.go
View File

@ -212,12 +212,12 @@ func (s *TrieSync) children(req *request) ([]*request, error) {
children := []child{}
switch node := (*req.object).(type) {
case shortNode:
case *shortNode:
children = []child{{
node: &node.Val,
depth: req.depth + len(node.Key),
}}
case fullNode:
case *fullNode:
for i := 0; i < 17; i++ {
if node.Children[i] != nil {
children = append(children, child{

114
trie/trie.go
View File

@ -62,6 +62,23 @@ type Trie struct {
root node
db Database
originalRoot common.Hash
// Cache generation values.
// cachegen increase by one with each commit operation.
// new nodes are tagged with the current generation and unloaded
// when their generation is older than than cachegen-cachelimit.
cachegen, cachelimit uint16
}
// SetCacheLimit sets the number of 'cache generations' to keep.
// A cache generations is created by a call to Commit.
func (t *Trie) SetCacheLimit(l uint16) {
t.cachelimit = l
}
// newFlag returns the cache flag value for a newly created node.
func (t *Trie) newFlag() nodeFlag {
return nodeFlag{dirty: true, gen: t.cachegen}
}
// New creates a trie with an existing root node from db.
@ -120,27 +137,25 @@ func (t *Trie) tryGet(origNode node, key []byte, pos int) (value []byte, newnode
return nil, nil, false, nil
case valueNode:
return n, n, false, nil
case shortNode:
case *shortNode:
if len(key)-pos < len(n.Key) || !bytes.Equal(n.Key, key[pos:pos+len(n.Key)]) {
// key not found in trie
return nil, n, false, nil
}
value, newnode, didResolve, err = t.tryGet(n.Val, key, pos+len(n.Key))
if err == nil && didResolve {
n = n.copy()
n.Val = newnode
return value, n, didResolve, err
} else {
return value, origNode, didResolve, err
}
case fullNode:
child := n.Children[key[pos]]
value, newnode, didResolve, err = t.tryGet(child, key, pos+1)
return value, n, didResolve, err
case *fullNode:
value, newnode, didResolve, err = t.tryGet(n.Children[key[pos]], key, pos+1)
if err == nil && didResolve {
n = n.copy()
n.Children[key[pos]] = newnode
return value, n, didResolve, err
} else {
return value, origNode, didResolve, err
}
return value, n, didResolve, err
case hashNode:
child, err := t.resolveHash(n, key[:pos], key[pos:])
if err != nil {
@ -199,22 +214,19 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
return true, value, nil
}
switch n := n.(type) {
case shortNode:
case *shortNode:
matchlen := prefixLen(key, n.Key)
// If the whole key matches, keep this short node as is
// and only update the value.
if matchlen == len(n.Key) {
dirty, nn, err := t.insert(n.Val, append(prefix, key[:matchlen]...), key[matchlen:], value)
if err != nil {
return false, nil, err
if !dirty || err != nil {
return false, n, err
}
if !dirty {
return false, n, nil
}
return true, shortNode{n.Key, nn, nil, true}, nil
return true, &shortNode{n.Key, nn, t.newFlag()}, nil
}
// Otherwise branch out at the index where they differ.
branch := fullNode{dirty: true}
branch := &fullNode{flags: t.newFlag()}
var err error
_, branch.Children[n.Key[matchlen]], err = t.insert(nil, append(prefix, n.Key[:matchlen+1]...), n.Key[matchlen+1:], n.Val)
if err != nil {
@ -229,21 +241,19 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
return true, branch, nil
}
// Otherwise, replace it with a short node leading up to the branch.
return true, shortNode{key[:matchlen], branch, nil, true}, nil
return true, &shortNode{key[:matchlen], branch, t.newFlag()}, nil
case fullNode:
case *fullNode:
dirty, nn, err := t.insert(n.Children[key[0]], append(prefix, key[0]), key[1:], value)
if err != nil {
return false, nil, err
if !dirty || err != nil {
return false, n, err
}
if !dirty {
return false, n, nil
}
n.Children[key[0]], n.hash, n.dirty = nn, nil, true
n = n.copy()
n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
return true, n, nil
case nil:
return true, shortNode{key, value, nil, true}, nil
return true, &shortNode{key, value, t.newFlag()}, nil
case hashNode:
// We've hit a part of the trie that isn't loaded yet. Load
@ -254,11 +264,8 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
return false, nil, err
}
dirty, nn, err := t.insert(rn, prefix, key, value)
if err != nil {
return false, nil, err
}
if !dirty {
return false, rn, nil
if !dirty || err != nil {
return false, rn, err
}
return true, nn, nil
@ -291,7 +298,7 @@ func (t *Trie) TryDelete(key []byte) error {
// nodes on the way up after deleting recursively.
func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
switch n := n.(type) {
case shortNode:
case *shortNode:
matchlen := prefixLen(key, n.Key)
if matchlen < len(n.Key) {
return false, n, nil // don't replace n on mismatch
@ -304,34 +311,29 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
// subtrie must contain at least two other values with keys
// longer than n.Key.
dirty, child, err := t.delete(n.Val, append(prefix, key[:len(n.Key)]...), key[len(n.Key):])
if err != nil {
return false, nil, err
}
if !dirty {
return false, n, nil
if !dirty || err != nil {
return false, n, err
}
switch child := child.(type) {
case shortNode:
case *shortNode:
// Deleting from the subtrie reduced it to another
// short node. Merge the nodes to avoid creating a
// shortNode{..., shortNode{...}}. Use concat (which
// always creates a new slice) instead of append to
// avoid modifying n.Key since it might be shared with
// other nodes.
return true, shortNode{concat(n.Key, child.Key...), child.Val, nil, true}, nil
return true, &shortNode{concat(n.Key, child.Key...), child.Val, t.newFlag()}, nil
default:
return true, shortNode{n.Key, child, nil, true}, nil
return true, &shortNode{n.Key, child, t.newFlag()}, nil
}
case fullNode:
case *fullNode:
dirty, nn, err := t.delete(n.Children[key[0]], append(prefix, key[0]), key[1:])
if err != nil {
return false, nil, err
if !dirty || err != nil {
return false, n, err
}
if !dirty {
return false, n, nil
}
n.Children[key[0]], n.hash, n.dirty = nn, nil, true
n = n.copy()
n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
// Check how many non-nil entries are left after deleting and
// reduce the full node to a short node if only one entry is
@ -365,14 +367,14 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
if err != nil {
return false, nil, err
}
if cnode, ok := cnode.(shortNode); ok {
if cnode, ok := cnode.(*shortNode); ok {
k := append([]byte{byte(pos)}, cnode.Key...)
return true, shortNode{k, cnode.Val, nil, true}, nil
return true, &shortNode{k, cnode.Val, t.newFlag()}, nil
}
}
// Otherwise, n is replaced by a one-nibble short node
// containing the child.
return true, shortNode{[]byte{byte(pos)}, n.Children[pos], nil, true}, nil
return true, &shortNode{[]byte{byte(pos)}, n.Children[pos], t.newFlag()}, nil
}
// n still contains at least two values and cannot be reduced.
return true, n, nil
@ -392,11 +394,8 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
return false, nil, err
}
dirty, nn, err := t.delete(rn, prefix, key)
if err != nil {
return false, nil, err
}
if !dirty {
return false, rn, nil
if !dirty || err != nil {
return false, rn, err
}
return true, nn, nil
@ -471,6 +470,7 @@ func (t *Trie) CommitTo(db DatabaseWriter) (root common.Hash, err error) {
return (common.Hash{}), err
}
t.root = cached
t.cachegen++
return common.BytesToHash(hash.(hashNode)), nil
}
@ -478,7 +478,7 @@ func (t *Trie) hashRoot(db DatabaseWriter) (node, node, error) {
if t.root == nil {
return hashNode(emptyRoot.Bytes()), nil, nil
}
h := newHasher()
h := newHasher(t.cachegen, t.cachelimit)
defer returnHasherToPool(h)
return h.hash(t.root, db, true)
}

10
trie/trie_test.go
View File

@ -460,8 +460,7 @@ const benchElemCount = 20000
func benchGet(b *testing.B, commit bool) {
trie := new(Trie)
if commit {
dir, tmpdb := tempDB()
defer os.RemoveAll(dir)
_, tmpdb := tempDB()
trie, _ = New(common.Hash{}, tmpdb)
}
k := make([]byte, 32)
@ -478,6 +477,13 @@ func benchGet(b *testing.B, commit bool) {
for i := 0; i < b.N; i++ {
trie.Get(k)
}
b.StopTimer()
if commit {
ldb := trie.db.(*ethdb.LDBDatabase)
ldb.Close()
os.RemoveAll(ldb.Path())
}
}
func benchUpdate(b *testing.B, e binary.ByteOrder) *Trie {