mpt: support put in batches
This commit is contained in:
Evgenii Stratonikov
Evgeniy Stratonikov
parent
ca86b78536
commit
fb88d4f3a0
5 changed files with 578 additions and 8 deletions
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@ -689,6 +689,9 @@ func (bc *Blockchain) storeBlock(block *block.Block, txpool *mempool.Pool) error
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d := cache.DAO.(*dao.Simple)
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if err := d.UpdateMPT(); err != nil {
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// Here MPT can be left in a half-applied state.
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// However if this error occurs, this is a bug somewhere in code
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// because changes applied are the ones from HALTed transactions.
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return fmt.Errorf("error while trying to apply MPT changes: %w", err)
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}
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@ -694,15 +694,10 @@ func (dao *Simple) Persist() (int, error) {
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// UpdateMPT updates MPT using storage items from the underlying memcached store.
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func (dao *Simple) UpdateMPT() error {
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var err error
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var b mpt.Batch
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dao.Store.MemoryStore.SeekAll([]byte{byte(storage.STStorage)}, func(k, v []byte) {
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if err != nil {
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return
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} else if v != nil {
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err = dao.MPT.Put(k[1:], v)
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} else {
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err = dao.MPT.Delete(k[1:])
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}
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b.Add(k[1:], v)
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})
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_, err := dao.MPT.PutBatch(b)
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return err
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}
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253
pkg/core/mpt/batch.go
Normal file
253
pkg/core/mpt/batch.go
Normal file
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@ -0,0 +1,253 @@
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package mpt
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import (
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"bytes"
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"sort"
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)
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// Batch is batch of storage changes.
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// It stores key-value pairs in a sorted state.
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type Batch struct {
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kv []keyValue
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}
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type keyValue struct {
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key []byte
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value []byte
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}
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// Add adds key-value pair to batch.
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// If there is an item with the specified key, it is replaced.
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func (b *Batch) Add(key []byte, value []byte) {
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path := toNibbles(key)
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i := sort.Search(len(b.kv), func(i int) bool {
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return bytes.Compare(path, b.kv[i].key) <= 0
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})
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if i == len(b.kv) {
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b.kv = append(b.kv, keyValue{path, value})
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} else if bytes.Equal(b.kv[i].key, path) {
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b.kv[i].value = value
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} else {
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b.kv = append(b.kv, keyValue{})
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copy(b.kv[i+1:], b.kv[i:])
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b.kv[i].key = path
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b.kv[i].value = value
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}
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}
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// PutBatch puts batch to trie.
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// It is not atomic (and probably cannot be without substantial slow-down)
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// and returns number of elements processed.
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// However each element is being put atomically, so Trie is always in a valid state.
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// It is used mostly after the block processing to update MPT and error is not expected.
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func (t *Trie) PutBatch(b Batch) (int, error) {
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r, n, err := t.putBatch(b.kv)
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t.root = r
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return n, err
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}
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func (t *Trie) putBatch(kv []keyValue) (Node, int, error) {
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return t.putBatchIntoNode(t.root, kv)
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}
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func (t *Trie) putBatchIntoNode(curr Node, kv []keyValue) (Node, int, error) {
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switch n := curr.(type) {
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case *LeafNode:
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return t.putBatchIntoLeaf(n, kv)
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case *BranchNode:
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return t.putBatchIntoBranch(n, kv)
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case *ExtensionNode:
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return t.putBatchIntoExtension(n, kv)
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case *HashNode:
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return t.putBatchIntoHash(n, kv)
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default:
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panic("invalid MPT node type")
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}
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}
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func (t *Trie) putBatchIntoLeaf(curr *LeafNode, kv []keyValue) (Node, int, error) {
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t.removeRef(curr.Hash(), curr.Bytes())
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return t.newSubTrieMany(nil, kv, curr.value)
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}
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func (t *Trie) putBatchIntoBranch(curr *BranchNode, kv []keyValue) (Node, int, error) {
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return t.addToBranch(curr, kv, true)
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}
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func (t *Trie) mergeExtension(prefix []byte, sub Node) Node {
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switch sn := sub.(type) {
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case *ExtensionNode:
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t.removeRef(sn.Hash(), sn.bytes)
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sn.key = append(prefix, sn.key...)
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sn.invalidateCache()
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t.addRef(sn.Hash(), sn.bytes)
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return sn
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case *HashNode:
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return sn
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default:
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if len(prefix) != 0 {
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e := NewExtensionNode(prefix, sub)
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t.addRef(e.Hash(), e.bytes)
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return e
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}
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return sub
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}
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}
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func (t *Trie) putBatchIntoExtension(curr *ExtensionNode, kv []keyValue) (Node, int, error) {
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t.removeRef(curr.Hash(), curr.bytes)
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common := lcpMany(kv)
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pref := lcp(common, curr.key)
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if len(pref) == len(curr.key) {
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// Extension must be split into new nodes.
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stripPrefix(len(curr.key), kv)
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sub, n, err := t.putBatchIntoNode(curr.next, kv)
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return t.mergeExtension(pref, sub), n, err
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}
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if len(pref) != 0 {
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stripPrefix(len(pref), kv)
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sub, n, err := t.putBatchIntoExtensionNoPrefix(curr.key[len(pref):], curr.next, kv)
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return t.mergeExtension(pref, sub), n, err
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}
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return t.putBatchIntoExtensionNoPrefix(curr.key, curr.next, kv)
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}
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func (t *Trie) putBatchIntoExtensionNoPrefix(key []byte, next Node, kv []keyValue) (Node, int, error) {
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b := NewBranchNode()
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if len(key) > 1 {
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b.Children[key[0]] = t.newSubTrie(key[1:], next, false)
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} else {
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b.Children[key[0]] = next
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}
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return t.addToBranch(b, kv, false)
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}
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func isEmpty(n Node) bool {
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hn, ok := n.(*HashNode)
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return ok && hn.IsEmpty()
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}
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// addToBranch puts items into the branch node assuming b is not yet in trie.
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func (t *Trie) addToBranch(b *BranchNode, kv []keyValue, inTrie bool) (Node, int, error) {
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if inTrie {
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t.removeRef(b.Hash(), b.bytes)
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}
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n, err := t.iterateBatch(kv, func(c byte, kv []keyValue) (int, error) {
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child, n, err := t.putBatchIntoNode(b.Children[c], kv)
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b.Children[c] = child
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return n, err
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})
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if inTrie && n != 0 {
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b.invalidateCache()
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}
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return t.stripBranch(b), n, err
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}
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// stripsBranch strips branch node after incomplete batch put.
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// It assumes there is no reference to b in trie.
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func (t *Trie) stripBranch(b *BranchNode) Node {
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var n int
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var lastIndex byte
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for i := range b.Children {
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if !isEmpty(b.Children[i]) {
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n++
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lastIndex = byte(i)
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}
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}
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switch {
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case n == 0:
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return new(HashNode)
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case n == 1:
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return t.mergeExtension([]byte{lastIndex}, b.Children[lastIndex])
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default:
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t.addRef(b.Hash(), b.bytes)
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return b
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}
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}
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func (t *Trie) iterateBatch(kv []keyValue, f func(c byte, kv []keyValue) (int, error)) (int, error) {
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var n int
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for len(kv) != 0 {
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c, i := getLastIndex(kv)
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if c != lastChild {
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stripPrefix(1, kv[:i])
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}
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sub, err := f(c, kv[:i])
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n += sub
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if err != nil {
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return n, err
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}
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kv = kv[i:]
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}
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return n, nil
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}
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func (t *Trie) putBatchIntoHash(curr *HashNode, kv []keyValue) (Node, int, error) {
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if curr.IsEmpty() {
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common := lcpMany(kv)
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stripPrefix(len(common), kv)
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return t.newSubTrieMany(common, kv, nil)
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}
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result, err := t.getFromStore(curr.hash)
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if err != nil {
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return curr, 0, err
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}
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return t.putBatchIntoNode(result, kv)
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}
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// Creates new subtrie from provided key-value pairs.
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// Items in kv must have no common prefix.
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// If there are any deletions in kv, return error.
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// kv is not empty.
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// kv is sorted by key.
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// value is current value stored by prefix.
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func (t *Trie) newSubTrieMany(prefix []byte, kv []keyValue, value []byte) (Node, int, error) {
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if len(kv[0].key) == 0 {
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if len(kv[0].value) == 0 {
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if len(kv) == 1 {
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if len(value) != 0 {
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return new(HashNode), 1, nil
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}
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return new(HashNode), 0, ErrNotFound
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}
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node, n, err := t.newSubTrieMany(prefix, kv[1:], nil)
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return node, n + 1, err
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}
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if len(kv) == 1 {
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return t.newSubTrie(prefix, NewLeafNode(kv[0].value), true), 1, nil
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}
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value = kv[0].value
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}
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// Prefix is empty and we have at least 2 children.
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b := NewBranchNode()
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if len(value) != 0 {
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// Empty key is always first.
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leaf := NewLeafNode(value)
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t.addRef(leaf.Hash(), leaf.bytes)
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b.Children[lastChild] = leaf
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}
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nd, n, err := t.addToBranch(b, kv, false)
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return t.mergeExtension(prefix, nd), n, err
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}
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func stripPrefix(n int, kv []keyValue) {
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for i := range kv {
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kv[i].key = kv[i].key[n:]
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}
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}
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func getLastIndex(kv []keyValue) (byte, int) {
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if len(kv[0].key) == 0 {
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return lastChild, 1
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}
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c := kv[0].key[0]
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for i := range kv[1:] {
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if kv[i+1].key[0] != c {
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return c, i + 1
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}
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}
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return c, len(kv)
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}
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305
pkg/core/mpt/batch_test.go
Normal file
305
pkg/core/mpt/batch_test.go
Normal file
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@ -0,0 +1,305 @@
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package mpt
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import (
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"encoding/hex"
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"fmt"
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"testing"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/stretchr/testify/require"
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)
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func TestBatchAdd(t *testing.T) {
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b := new(Batch)
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b.Add([]byte{1}, []byte{2})
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b.Add([]byte{2, 16}, []byte{3})
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b.Add([]byte{2, 0}, []byte{4})
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b.Add([]byte{0, 1}, []byte{5})
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b.Add([]byte{2, 0}, []byte{6})
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expected := []keyValue{
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{[]byte{0, 0, 0, 1}, []byte{5}},
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{[]byte{0, 1}, []byte{2}},
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{[]byte{0, 2, 0, 0}, []byte{6}},
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{[]byte{0, 2, 1, 0}, []byte{3}},
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}
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require.Equal(t, expected, b.kv)
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}
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type pairs = [][2][]byte
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func testIncompletePut(t *testing.T, ps pairs, n int, tr1, tr2 *Trie) {
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var b Batch
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for i, p := range ps {
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if i < n {
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require.NoError(t, tr1.Put(p[0], p[1]), "item %d", i)
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} else if i == n {
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require.Error(t, tr1.Put(p[0], p[1]), "item %d", i)
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}
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b.Add(p[0], p[1])
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}
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num, err := tr2.PutBatch(b)
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if n == len(ps) {
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require.NoError(t, err)
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} else {
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require.Error(t, err)
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}
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require.Equal(t, n, num)
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require.Equal(t, tr1.StateRoot(), tr2.StateRoot())
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t.Run("test restore", func(t *testing.T) {
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tr2.Flush()
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tr3 := NewTrie(NewHashNode(tr2.StateRoot()), false, storage.NewMemCachedStore(tr2.Store))
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for _, p := range ps[:n] {
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val, err := tr3.Get(p[0])
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if p[1] == nil {
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require.Error(t, err)
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continue
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}
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require.NoError(t, err, "key: %s", hex.EncodeToString(p[0]))
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require.Equal(t, p[1], val)
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}
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})
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}
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func testPut(t *testing.T, ps pairs, tr1, tr2 *Trie) {
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testIncompletePut(t, ps, len(ps), tr1, tr2)
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}
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func TestTrie_PutBatchLeaf(t *testing.T) {
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prepareLeaf := func(t *testing.T) (*Trie, *Trie) {
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tr1 := NewTrie(new(HashNode), false, newTestStore())
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tr2 := NewTrie(new(HashNode), false, newTestStore())
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require.NoError(t, tr1.Put([]byte{}, []byte("value")))
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require.NoError(t, tr2.Put([]byte{}, []byte("value")))
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return tr1, tr2
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}
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t.Run("remove", func(t *testing.T) {
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tr1, tr2 := prepareLeaf(t)
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var ps = pairs{{[]byte{}, nil}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("replace", func(t *testing.T) {
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tr1, tr2 := prepareLeaf(t)
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var ps = pairs{{[]byte{}, []byte("replace")}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("remove and replace", func(t *testing.T) {
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tr1, tr2 := prepareLeaf(t)
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var ps = pairs{
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{[]byte{}, nil},
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{[]byte{2}, []byte("replace2")},
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}
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testPut(t, ps, tr1, tr2)
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})
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}
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func TestTrie_PutBatchExtension(t *testing.T) {
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prepareExtension := func(t *testing.T) (*Trie, *Trie) {
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tr1 := NewTrie(new(HashNode), false, newTestStore())
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tr2 := NewTrie(new(HashNode), false, newTestStore())
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require.NoError(t, tr1.Put([]byte{1, 2}, []byte("value1")))
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require.NoError(t, tr2.Put([]byte{1, 2}, []byte("value1")))
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return tr1, tr2
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}
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t.Run("split, key len > 1", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{{[]byte{2, 3}, []byte("value2")}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("split, key len = 1", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{{[]byte{1, 3}, []byte("value2")}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("add to next", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{{[]byte{1, 2, 3}, []byte("value2")}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("add to next with leaf", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{
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{[]byte{}, []byte("value3")},
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{[]byte{1, 2, 3}, []byte("value2")},
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}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("remove value", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{{[]byte{1, 2}, nil}}
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testPut(t, ps, tr1, tr2)
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})
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t.Run("add to next, merge extension", func(t *testing.T) {
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tr1, tr2 := prepareExtension(t)
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var ps = pairs{
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{[]byte{1, 2}, nil},
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{[]byte{1, 2, 3}, []byte("value2")},
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}
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testPut(t, ps, tr1, tr2)
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})
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}
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func TestTrie_PutBatchBranch(t *testing.T) {
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prepareBranch := func(t *testing.T) (*Trie, *Trie) {
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tr1 := NewTrie(new(HashNode), false, newTestStore())
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tr2 := NewTrie(new(HashNode), false, newTestStore())
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require.NoError(t, tr1.Put([]byte{0x00, 2}, []byte("value1")))
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require.NoError(t, tr2.Put([]byte{0x00, 2}, []byte("value1")))
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require.NoError(t, tr1.Put([]byte{0x10, 3}, []byte("value2")))
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require.NoError(t, tr2.Put([]byte{0x10, 3}, []byte("value2")))
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return tr1, tr2
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}
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t.Run("simple add", func(t *testing.T) {
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tr1, tr2 := prepareBranch(t)
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var ps = pairs{{[]byte{0x20, 4}, []byte("value3")}}
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testPut(t, ps, tr1, tr2)
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})
|
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t.Run("remove 1, transform to extension", func(t *testing.T) {
|
||||
tr1, tr2 := prepareBranch(t)
|
||||
var ps = pairs{{[]byte{0x00, 2}, nil}}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
})
|
||||
t.Run("incomplete put, transform to extension", func(t *testing.T) {
|
||||
tr1, tr2 := prepareBranch(t)
|
||||
var ps = pairs{
|
||||
{[]byte{0x00, 2}, nil},
|
||||
{[]byte{0x20, 2}, nil},
|
||||
{[]byte{0x30, 3}, []byte("won't be put")},
|
||||
}
|
||||
testIncompletePut(t, ps, 1, tr1, tr2)
|
||||
})
|
||||
t.Run("incomplete put, transform to empty", func(t *testing.T) {
|
||||
tr1, tr2 := prepareBranch(t)
|
||||
var ps = pairs{
|
||||
{[]byte{0x00, 2}, nil},
|
||||
{[]byte{0x10, 3}, nil},
|
||||
{[]byte{0x20, 2}, nil},
|
||||
{[]byte{0x30, 3}, []byte("won't be put")},
|
||||
}
|
||||
testIncompletePut(t, ps, 2, tr1, tr2)
|
||||
})
|
||||
t.Run("remove 2, become empty", func(t *testing.T) {
|
||||
tr1, tr2 := prepareBranch(t)
|
||||
var ps = pairs{
|
||||
{[]byte{0x00, 2}, nil},
|
||||
{[]byte{0x10, 3}, nil},
|
||||
}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
})
|
||||
}
|
||||
|
||||
func TestTrie_PutBatchHash(t *testing.T) {
|
||||
prepareHash := func(t *testing.T) (*Trie, *Trie) {
|
||||
tr1 := NewTrie(new(HashNode), false, newTestStore())
|
||||
tr2 := NewTrie(new(HashNode), false, newTestStore())
|
||||
require.NoError(t, tr1.Put([]byte{0x10}, []byte("value1")))
|
||||
require.NoError(t, tr2.Put([]byte{0x10}, []byte("value1")))
|
||||
require.NoError(t, tr1.Put([]byte{0x20}, []byte("value2")))
|
||||
require.NoError(t, tr2.Put([]byte{0x20}, []byte("value2")))
|
||||
tr1.Flush()
|
||||
tr2.Flush()
|
||||
return tr1, tr2
|
||||
}
|
||||
|
||||
t.Run("good", func(t *testing.T) {
|
||||
tr1, tr2 := prepareHash(t)
|
||||
var ps = pairs{{[]byte{2}, []byte("value2")}}
|
||||
tr1.Collapse(0)
|
||||
tr1.Collapse(0)
|
||||
testPut(t, ps, tr1, tr2)
|
||||
})
|
||||
t.Run("incomplete, second hash not found", func(t *testing.T) {
|
||||
tr1, tr2 := prepareHash(t)
|
||||
var ps = pairs{
|
||||
{[]byte{0x10}, []byte("replace1")},
|
||||
{[]byte{0x20}, []byte("replace2")},
|
||||
}
|
||||
tr1.Collapse(1)
|
||||
tr2.Collapse(1)
|
||||
key := makeStorageKey(tr1.root.(*BranchNode).Children[2].Hash().BytesBE())
|
||||
require.NoError(t, tr1.Store.Delete(key))
|
||||
require.NoError(t, tr2.Store.Delete(key))
|
||||
testIncompletePut(t, ps, 1, tr1, tr2)
|
||||
})
|
||||
}
|
||||
|
||||
func TestTrie_PutBatchEmpty(t *testing.T) {
|
||||
t.Run("good", func(t *testing.T) {
|
||||
tr1 := NewTrie(new(HashNode), false, newTestStore())
|
||||
tr2 := NewTrie(new(HashNode), false, newTestStore())
|
||||
var ps = pairs{
|
||||
{[]byte{}, []byte("value0")},
|
||||
{[]byte{1}, []byte("value1")},
|
||||
{[]byte{3}, []byte("value3")},
|
||||
}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
})
|
||||
t.Run("incomplete", func(t *testing.T) {
|
||||
var ps = pairs{
|
||||
{[]byte{}, []byte("replace0")},
|
||||
{[]byte{1}, []byte("replace1")},
|
||||
{[]byte{2}, nil},
|
||||
{[]byte{3}, []byte("replace3")},
|
||||
}
|
||||
tr1 := NewTrie(new(HashNode), false, newTestStore())
|
||||
tr2 := NewTrie(new(HashNode), false, newTestStore())
|
||||
testIncompletePut(t, ps, 2, tr1, tr2)
|
||||
})
|
||||
}
|
||||
|
||||
// For the sake of coverage.
|
||||
func TestTrie_InvalidNodeType(t *testing.T) {
|
||||
tr := NewTrie(new(HashNode), false, newTestStore())
|
||||
var b Batch
|
||||
b.Add([]byte{1}, []byte("value"))
|
||||
tr.root = Node(nil)
|
||||
require.Panics(t, func() { _, _ = tr.PutBatch(b) })
|
||||
}
|
||||
|
||||
func TestTrie_PutBatch(t *testing.T) {
|
||||
tr1 := NewTrie(new(HashNode), false, newTestStore())
|
||||
tr2 := NewTrie(new(HashNode), false, newTestStore())
|
||||
var ps = pairs{
|
||||
{[]byte{1}, []byte{1}},
|
||||
{[]byte{2}, []byte{3}},
|
||||
{[]byte{4}, []byte{5}},
|
||||
}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
|
||||
ps = pairs{[2][]byte{{4}, {6}}}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
|
||||
ps = pairs{[2][]byte{{4}, nil}}
|
||||
testPut(t, ps, tr1, tr2)
|
||||
}
|
||||
|
||||
// This function is unused, but is helpful for debugging
|
||||
// as it provides more readable Trie representation compared to
|
||||
// `spew.Dump()`
|
||||
func printNode(prefix string, n Node) {
|
||||
switch tn := n.(type) {
|
||||
case *HashNode:
|
||||
if tn.IsEmpty() {
|
||||
fmt.Printf("%s empty\n", prefix)
|
||||
return
|
||||
}
|
||||
fmt.Printf("%s %s\n", prefix, tn.Hash().StringLE())
|
||||
case *BranchNode:
|
||||
for i, c := range tn.Children {
|
||||
if isEmpty(c) {
|
||||
continue
|
||||
}
|
||||
fmt.Printf("%s [%2d] ->\n", prefix, i)
|
||||
printNode(prefix+" ", c)
|
||||
}
|
||||
case *ExtensionNode:
|
||||
fmt.Printf("%s extension-> %s\n", prefix, hex.EncodeToString(tn.key))
|
||||
printNode(prefix+" ", tn.next)
|
||||
case *LeafNode:
|
||||
fmt.Printf("%s leaf-> %s\n", prefix, hex.EncodeToString(tn.value))
|
||||
}
|
||||
}
|
||||
|
|
@ -17,6 +17,20 @@ func lcp(a, b []byte) []byte {
|
|||
return a[:i]
|
||||
}
|
||||
|
||||
func lcpMany(kv []keyValue) []byte {
|
||||
if len(kv) == 1 {
|
||||
return kv[0].key
|
||||
}
|
||||
p := lcp(kv[0].key, kv[1].key)
|
||||
if len(p) == 0 {
|
||||
return p
|
||||
}
|
||||
for i := range kv[2:] {
|
||||
p = lcp(p, kv[2+i].key)
|
||||
}
|
||||
return p
|
||||
}
|
||||
|
||||
// copySlice is a helper for copying slice if needed.
|
||||
func copySlice(a []byte) []byte {
|
||||
b := make([]byte, len(a))
|
||||
|
|
|
|||
Loading…
Reference in a new issue