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core, core/state, trie: enterprise hand-tuned multi-level caching

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This commit is contained in:
Péter Szilágyi
2016-05-19 13:24:14 +03:00
parent a7434fd008
commit 748d1c171d
9 changed files with 245 additions and 134 deletions
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239
trie/trie.go
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@ -129,7 +129,7 @@ func (t *Trie) TryGet(key []byte) ([]byte, error) {
tn = n.Val
pos += len(n.Key)
case fullNode:
tn = n[key[pos]]
tn = n.Children[key[pos]]
pos++
case nil:
return nil, nil
@ -169,13 +169,13 @@ func (t *Trie) Update(key, value []byte) {
func (t *Trie) TryUpdate(key, value []byte) error {
k := compactHexDecode(key)
if len(value) != 0 {
n, err := t.insert(t.root, nil, k, valueNode(value))
_, n, err := t.insert(t.root, nil, k, valueNode(value))
if err != nil {
return err
}
t.root = n
} else {
n, err := t.delete(t.root, nil, k)
_, n, err := t.delete(t.root, nil, k)
if err != nil {
return err
}
@ -184,9 +184,12 @@ func (t *Trie) TryUpdate(key, value []byte) error {
return nil
}
func (t *Trie) insert(n node, prefix, key []byte, value node) (node, error) {
func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error) {
if len(key) == 0 {
return value, nil
if v, ok := n.(valueNode); ok {
return !bytes.Equal(v, value.(valueNode)), value, nil
}
return true, value, nil
}
switch n := n.(type) {
case shortNode:
@ -194,53 +197,63 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (node, error) {
// If the whole key matches, keep this short node as is
// and only update the value.
if matchlen == len(n.Key) {
nn, err := t.insert(n.Val, append(prefix, key[:matchlen]...), key[matchlen:], value)
dirty, nn, err := t.insert(n.Val, append(prefix, key[:matchlen]...), key[matchlen:], value)
if err != nil {
return nil, err
return false, nil, err
}
return shortNode{n.Key, nn}, nil
if !dirty {
return false, n, nil
}
return true, shortNode{n.Key, nn, nil, true}, nil
}
// Otherwise branch out at the index where they differ.
var branch fullNode
branch := fullNode{dirty: true}
var err error
branch[n.Key[matchlen]], err = t.insert(nil, append(prefix, n.Key[:matchlen+1]...), n.Key[matchlen+1:], n.Val)
_, branch.Children[n.Key[matchlen]], err = t.insert(nil, append(prefix, n.Key[:matchlen+1]...), n.Key[matchlen+1:], n.Val)
if err != nil {
return nil, err
return false, nil, err
}
branch[key[matchlen]], err = t.insert(nil, append(prefix, key[:matchlen+1]...), key[matchlen+1:], value)
_, branch.Children[key[matchlen]], err = t.insert(nil, append(prefix, key[:matchlen+1]...), key[matchlen+1:], value)
if err != nil {
return nil, err
return false, nil, err
}
// Replace this shortNode with the branch if it occurs at index 0.
if matchlen == 0 {
return branch, nil
return true, branch, nil
}
// Otherwise, replace it with a short node leading up to the branch.
return shortNode{key[:matchlen], branch}, nil
return true, shortNode{key[:matchlen], branch, nil, true}, nil
case fullNode:
nn, err := t.insert(n[key[0]], append(prefix, key[0]), key[1:], value)
dirty, nn, err := t.insert(n.Children[key[0]], append(prefix, key[0]), key[1:], value)
if err != nil {
return nil, err
return false, nil, err
}
n[key[0]] = nn
return n, nil
if !dirty {
return false, n, nil
}
n.Children[key[0]], n.hash, n.dirty = nn, nil, true
return true, n, nil
case nil:
return shortNode{key, value}, nil
return true, shortNode{key, value, nil, true}, nil
case hashNode:
// We've hit a part of the trie that isn't loaded yet. Load
// the node and insert into it. This leaves all child nodes on
// the path to the value in the trie.
//
// TODO: track whether insertion changed the value and keep
// n as a hash node if it didn't.
rn, err := t.resolveHash(n, prefix, key)
if err != nil {
return nil, err
return false, nil, err
}
return t.insert(rn, prefix, key, value)
dirty, nn, err := t.insert(rn, prefix, key, value)
if err != nil {
return false, nil, err
}
if !dirty {
return false, rn, nil
}
return true, nn, nil
default:
panic(fmt.Sprintf("%T: invalid node: %v", n, n))
@ -258,7 +271,7 @@ func (t *Trie) Delete(key []byte) {
// If a node was not found in the database, a MissingNodeError is returned.
func (t *Trie) TryDelete(key []byte) error {
k := compactHexDecode(key)
n, err := t.delete(t.root, nil, k)
_, n, err := t.delete(t.root, nil, k)
if err != nil {
return err
}
@ -269,23 +282,26 @@ func (t *Trie) TryDelete(key []byte) error {
// delete returns the new root of the trie with key deleted.
// It reduces the trie to minimal form by simplifying
// nodes on the way up after deleting recursively.
func (t *Trie) delete(n node, prefix, key []byte) (node, error) {
func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
switch n := n.(type) {
case shortNode:
matchlen := prefixLen(key, n.Key)
if matchlen < len(n.Key) {
return n, nil // don't replace n on mismatch
return false, n, nil // don't replace n on mismatch
}
if matchlen == len(key) {
return nil, nil // remove n entirely for whole matches
return true, nil, nil // remove n entirely for whole matches
}
// The key is longer than n.Key. Remove the remaining suffix
// from the subtrie. Child can never be nil here since the
// subtrie must contain at least two other values with keys
// longer than n.Key.
child, err := t.delete(n.Val, append(prefix, key[:len(n.Key)]...), key[len(n.Key):])
dirty, child, err := t.delete(n.Val, append(prefix, key[:len(n.Key)]...), key[len(n.Key):])
if err != nil {
return nil, err
return false, nil, err
}
if !dirty {
return false, n, nil
}
switch child := child.(type) {
case shortNode:
@ -295,17 +311,21 @@ func (t *Trie) delete(n node, prefix, key []byte) (node, error) {
// always creates a new slice) instead of append to
// avoid modifying n.Key since it might be shared with
// other nodes.
return shortNode{concat(n.Key, child.Key...), child.Val}, nil
return true, shortNode{concat(n.Key, child.Key...), child.Val, nil, true}, nil
default:
return shortNode{n.Key, child}, nil
return true, shortNode{n.Key, child, nil, true}, nil
}
case fullNode:
nn, err := t.delete(n[key[0]], append(prefix, key[0]), key[1:])
dirty, nn, err := t.delete(n.Children[key[0]], append(prefix, key[0]), key[1:])
if err != nil {
return nil, err
return false, nil, err
}
n[key[0]] = nn
if !dirty {
return false, n, nil
}
n.Children[key[0]], n.hash, n.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
// left. Since n must've contained at least two children
@ -316,7 +336,7 @@ func (t *Trie) delete(n node, prefix, key []byte) (node, error) {
// value that is left in n or -2 if n contains at least two
// values.
pos := -1
for i, cld := range n {
for i, cld := range n.Children {
if cld != nil {
if pos == -1 {
pos = i
@ -334,37 +354,41 @@ func (t *Trie) delete(n node, prefix, key []byte) (node, error) {
// shortNode{..., shortNode{...}}. Since the entry
// might not be loaded yet, resolve it just for this
// check.
cnode, err := t.resolve(n[pos], prefix, []byte{byte(pos)})
cnode, err := t.resolve(n.Children[pos], prefix, []byte{byte(pos)})
if err != nil {
return nil, err
return false, nil, err
}
if cnode, ok := cnode.(shortNode); ok {
k := append([]byte{byte(pos)}, cnode.Key...)
return shortNode{k, cnode.Val}, nil
return true, shortNode{k, cnode.Val, nil, true}, nil
}
}
// Otherwise, n is replaced by a one-nibble short node
// containing the child.
return shortNode{[]byte{byte(pos)}, n[pos]}, nil
return true, shortNode{[]byte{byte(pos)}, n.Children[pos], nil, true}, nil
}
// n still contains at least two values and cannot be reduced.
return n, nil
return true, n, nil
case nil:
return nil, nil
return false, nil, nil
case hashNode:
// We've hit a part of the trie that isn't loaded yet. Load
// the node and delete from it. This leaves all child nodes on
// the path to the value in the trie.
//
// TODO: track whether deletion actually hit a key and keep
// n as a hash node if it didn't.
rn, err := t.resolveHash(n, prefix, key)
if err != nil {
return nil, err
return false, nil, err
}
return t.delete(rn, prefix, key)
dirty, nn, err := t.delete(rn, prefix, key)
if err != nil {
return false, nil, err
}
if !dirty {
return false, rn, nil
}
return true, nn, nil
default:
panic(fmt.Sprintf("%T: invalid node: %v (%v)", n, n, key))
@ -413,8 +437,9 @@ func (t *Trie) Root() []byte { return t.Hash().Bytes() }
// Hash returns the root hash of the trie. It does not write to the
// database and can be used even if the trie doesn't have one.
func (t *Trie) Hash() common.Hash {
root, _ := t.hashRoot(nil)
return common.BytesToHash(root.(hashNode))
hash, cached, _ := t.hashRoot(nil)
t.root = cached
return common.BytesToHash(hash.(hashNode))
}
// Commit writes all nodes to the trie's database.
@ -437,17 +462,17 @@ func (t *Trie) Commit() (root common.Hash, err error) {
// the changes made to db are written back to the trie's attached
// database before using the trie.
func (t *Trie) CommitTo(db DatabaseWriter) (root common.Hash, err error) {
n, err := t.hashRoot(db)
hash, cached, err := t.hashRoot(db)
if err != nil {
return (common.Hash{}), err
}
t.root = n
return common.BytesToHash(n.(hashNode)), nil
t.root = cached
return common.BytesToHash(hash.(hashNode)), nil
}
func (t *Trie) hashRoot(db DatabaseWriter) (node, error) {
func (t *Trie) hashRoot(db DatabaseWriter) (node, node, error) {
if t.root == nil {
return hashNode(emptyRoot.Bytes()), nil
return hashNode(emptyRoot.Bytes()), nil, nil
}
if t.hasher == nil {
t.hasher = newHasher()
@ -464,51 +489,87 @@ func newHasher() *hasher {
return &hasher{tmp: new(bytes.Buffer), sha: sha3.NewKeccak256()}
}
func (h *hasher) hash(n node, db DatabaseWriter, force bool) (node, error) {
hashed, err := h.replaceChildren(n, db)
// hash collapses a node down into a hash node, also returning a copy of the
// 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
}
// Trie not processed yet or needs storage, walk the children
collapsed, cached, err := h.hashChildren(n, db)
if err != nil {
return hashNode{}, err
return hashNode{}, n, err
}
if n, err = h.store(hashed, db, force); err != nil {
return hashNode{}, err
hashed, err := h.store(collapsed, db, force)
if err != nil {
return hashNode{}, n, err
}
return n, nil
// Cache the hash and RLP blob of the ndoe for later reuse
if hash, ok := hashed.(hashNode); ok && !force {
switch cached := cached.(type) {
case shortNode:
cached.hash = hash
if db != nil {
cached.dirty = false
}
return hashed, cached, nil
case fullNode:
cached.hash = hash
if db != nil {
cached.dirty = false
}
return hashed, cached, nil
}
}
return hashed, cached, nil
}
// hashChildren replaces child nodes of n with their hashes if the encoded
// size of the child is larger than a hash.
func (h *hasher) replaceChildren(n node, db DatabaseWriter) (node, error) {
// hashChildren replaces the children of a node with their hashes if the encoded
// size of the child is larger than a hash, returning the collapsed node as well
// as a replacement for the original node with the child hashes cached in.
func (h *hasher) hashChildren(original node, db DatabaseWriter) (node, node, error) {
var err error
switch n := n.(type) {
switch n := original.(type) {
case shortNode:
// Hash the short node's child, caching the newly hashed subtree
cached := n
cached.Key = common.CopyBytes(cached.Key)
n.Key = compactEncode(n.Key)
if _, ok := n.Val.(valueNode); !ok {
if n.Val, err = h.hash(n.Val, db, false); err != nil {
return n, err
if n.Val, cached.Val, err = h.hash(n.Val, db, false); err != nil {
return n, original, err
}
}
if n.Val == nil {
// Ensure that nil children are encoded as empty strings.
n.Val = valueNode(nil)
n.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
}
return n, nil
return n, cached, nil
case fullNode:
// Hash the full node's children, caching the newly hashed subtrees
cached := fullNode{dirty: n.dirty}
for i := 0; i < 16; i++ {
if n[i] != nil {
if n[i], err = h.hash(n[i], db, false); err != nil {
return n, err
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
}
} else {
// Ensure that nil children are encoded as empty strings.
n[i] = valueNode(nil)
n.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
}
}
if n[16] == nil {
n[16] = valueNode(nil)
cached.Children[16] = n.Children[16]
if n.Children[16] == nil {
n.Children[16] = valueNode(nil)
}
return n, nil
return n, cached, nil
default:
return n, nil
// Value and hash nodes don't have children so they're left as were
return n, original, nil
}
}
@ -517,21 +578,23 @@ func (h *hasher) store(n node, db DatabaseWriter, force bool) (node, error) {
if _, isHash := n.(hashNode); n == nil || isHash {
return n, nil
}
// Generate the RLP encoding of the node
h.tmp.Reset()
if err := rlp.Encode(h.tmp, n); err != nil {
panic("encode error: " + err.Error())
}
if h.tmp.Len() < 32 && !force {
// Nodes smaller than 32 bytes are stored inside their parent.
return n, nil
return n, nil // Nodes smaller than 32 bytes are stored inside their parent
}
// Larger nodes are replaced by their hash and stored in the database.
h.sha.Reset()
h.sha.Write(h.tmp.Bytes())
key := hashNode(h.sha.Sum(nil))
if db != nil {
err := db.Put(key, h.tmp.Bytes())
return key, err
hash, _ := n.cache()
if hash == nil {
h.sha.Reset()
h.sha.Write(h.tmp.Bytes())
hash = hashNode(h.sha.Sum(nil))
}
return key, nil
if db != nil {
return hash, db.Put(hash, h.tmp.Bytes())
}
return hash, nil
}