feat(blockdb): add block database

Author: DracoLi

plugin/evm/database/block_cache.go

@@ -0,0 +1,51 @@
+// Copyright (C) 2019-2025, Ava Labs, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package database
+
+import (
+	"sync"
+
+	"github.com/ava-labs/libevm/common"
+)
+
+// blockCache is a cache for block header and body.
+// It allows saving body and header separately via save while
+// fetching both body and header at once via get.
+type blockCache struct {
+	bodyCache   map[common.Hash][]byte
+	headerCache map[common.Hash][]byte
+	mu          sync.RWMutex
+}
+
+func newBlockCache() *blockCache {
+	return &blockCache{
+		bodyCache:   make(map[common.Hash][]byte),
+		headerCache: make(map[common.Hash][]byte),
+	}
+}
+
+func (b *blockCache) get(blockHash common.Hash) ([]byte, []byte, bool) {
+	b.mu.RLock()
+	defer b.mu.RUnlock()
+	bodyData, hasBody := b.bodyCache[blockHash]
+	headerData, hasHeader := b.headerCache[blockHash]
+	return bodyData, headerData, hasBody && hasHeader
+}
+
+func (b *blockCache) clear(blockHash common.Hash) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	delete(b.bodyCache, blockHash)
+	delete(b.headerCache, blockHash)
+}
+
+func (b *blockCache) save(key []byte, blockHash common.Hash, value []byte) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if isBodyKey(key) {
+		b.bodyCache[blockHash] = value
+	} else if isHeaderKey(key) {
+		b.headerCache[blockHash] = value
+	}
+}