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value_node_db.go
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/
value_node_db.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package merkledb
import (
"sync"
"github.com/ava-labs/avalanchego/cache"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/utils"
)
var _ database.Iterator = (*iterator)(nil)
type valueNodeDB struct {
// Holds unused []byte
bufferPool *sync.Pool
// The underlying storage.
// Keys written to [baseDB] are prefixed with [valueNodePrefix].
baseDB database.Database
// If a value is nil, the corresponding key isn't in the trie.
// Paths in [nodeCache] aren't prefixed with [valueNodePrefix].
nodeCache cache.Cacher[path, *node]
metrics merkleMetrics
closed utils.Atomic[bool]
}
func newValueNodeDB(db database.Database, bufferPool *sync.Pool, metrics merkleMetrics, size int) *valueNodeDB {
return &valueNodeDB{
metrics: metrics,
baseDB: db,
bufferPool: bufferPool,
nodeCache: cache.NewSizedLRU(size, cacheEntrySize),
}
}
func (db *valueNodeDB) newIteratorWithStartAndPrefix(start, prefix []byte) database.Iterator {
prefixedStart := addPrefixToKey(db.bufferPool, valueNodePrefix, start)
prefixedPrefix := addPrefixToKey(db.bufferPool, valueNodePrefix, prefix)
i := &iterator{
db: db,
nodeIter: db.baseDB.NewIteratorWithStartAndPrefix(prefixedStart, prefixedPrefix),
}
db.bufferPool.Put(prefixedStart)
db.bufferPool.Put(prefixedPrefix)
return i
}
func (db *valueNodeDB) Close() {
db.closed.Set(true)
}
func (db *valueNodeDB) NewBatch() *valueNodeBatch {
return &valueNodeBatch{
db: db,
ops: make(map[path]*node, defaultBufferLength),
}
}
func (db *valueNodeDB) Get(key path) (*node, error) {
if cachedValue, isCached := db.nodeCache.Get(key); isCached {
db.metrics.ValueNodeCacheHit()
if cachedValue == nil {
return nil, database.ErrNotFound
}
return cachedValue, nil
}
db.metrics.ValueNodeCacheMiss()
prefixedKey := addPrefixToKey(db.bufferPool, valueNodePrefix, key.Serialize().Value)
defer db.bufferPool.Put(prefixedKey)
db.metrics.DatabaseNodeRead()
nodeBytes, err := db.baseDB.Get(prefixedKey)
if err != nil {
return nil, err
}
return parseNode(key, nodeBytes)
}
// Batch of database operations
type valueNodeBatch struct {
db *valueNodeDB
ops map[path]*node
}
func (b *valueNodeBatch) Put(key path, value *node) {
b.ops[key] = value
}
func (b *valueNodeBatch) Delete(key path) {
b.ops[key] = nil
}
// Write flushes any accumulated data to the underlying database.
func (b *valueNodeBatch) Write() error {
dbBatch := b.db.baseDB.NewBatch()
for key, n := range b.ops {
b.db.metrics.DatabaseNodeWrite()
b.db.nodeCache.Put(key, n)
prefixedKey := addPrefixToKey(b.db.bufferPool, valueNodePrefix, key.Serialize().Value)
if n == nil {
if err := dbBatch.Delete(prefixedKey); err != nil {
return err
}
} else if err := dbBatch.Put(prefixedKey, n.bytes()); err != nil {
return err
}
b.db.bufferPool.Put(prefixedKey)
}
return dbBatch.Write()
}
type iterator struct {
db *valueNodeDB
nodeIter database.Iterator
current *node
err error
}
func (i *iterator) Error() error {
if i.err != nil {
return i.err
}
if i.db.closed.Get() {
return database.ErrClosed
}
return i.nodeIter.Error()
}
func (i *iterator) Key() []byte {
if i.current == nil {
return nil
}
return i.current.key.Serialize().Value
}
func (i *iterator) Value() []byte {
if i.current == nil {
return nil
}
return i.current.value.Value()
}
func (i *iterator) Next() bool {
i.current = nil
if i.Error() != nil || i.db.closed.Get() {
return false
}
if !i.nodeIter.Next() {
return false
}
i.db.metrics.DatabaseNodeRead()
key := i.nodeIter.Key()
key = key[valueNodePrefixLen:]
n, err := parseNode(newPath(key), i.nodeIter.Value())
if err != nil {
i.err = err
return false
}
i.current = n
return true
}
func (i *iterator) Release() {
i.nodeIter.Release()
}