#461 Add Caching to Store Database

state/database.go

@@ -59,6 +59,8 @@ type Database struct {
 	// EXTCODESIZE calls.
 	codeSizeCache *lru.Cache
 
+	dataCache     *lru.Cache
+
 	Tracing bool
 }
 
@@ -66,7 +68,7 @@ type Database struct {
 // implements Ethereum's state.Database interface. An error is returned if the
 // latest state failed to load. The underlying storage structure is defined by
 // the Cosmos SDK IAVL tree.
-func NewDatabase(stateDB, codeDB dbm.DB) (*Database, error) {
+func NewDatabase(stateDB, codeDB dbm.DB, dataCacheSize int) (*Database, error) {
 	// Initialize an implementation of Ethereum state.Database and create a
 	// Cosmos SDK multi-store.
 	db := &Database{
@@ -94,6 +96,7 @@ func NewDatabase(stateDB, codeDB dbm.DB) (*Database, error) {
 	db.ethTrieDB = ethtrie.NewDatabase(&core.EthereumDB{CodeDB: codeDB})
 
 	db.codeSizeCache, _ = lru.New(codeSizeCacheSize)
+	db.dataCache, _ = lru.New(dataCacheSize)
 
 	return db, nil
 }
@@ -133,6 +136,7 @@ func (db *Database) OpenTrie(root ethcmn.Hash) (ethstate.Trie, error) {
 		store:         db.accountsCache,
 		accountsCache: db.accountsCache,
 		storageCache:  db.storageCache,
+		dataCache:     db.dataCache,
 		ethTrieDB:     db.ethTrieDB,
 		empty:         isRootEmpty(root),
 		root:          rootHashFromVersion(db.stateStore.LastCommitID().Version),
@@ -154,10 +158,11 @@ func (db *Database) OpenStorageTrie(addrHash, root ethcmn.Hash) (ethstate.Trie,
 	// a contract storage trie does not need an accountCache, storageCache or
 	// an Ethereum trie because it will not be used upon commitment.
 	return &Trie{
-		store:  db.storageCache,
+		store:     db.storageCache,
-		prefix: addrHash.Bytes(),
+		dataCache: db.dataCache,
-		empty:  isRootEmpty(root),
+		prefix:    addrHash.Bytes(),
-		root:   rootHashFromVersion(db.stateStore.LastCommitID().Version),
+		empty:     isRootEmpty(root),
+		root:      rootHashFromVersion(db.stateStore.LastCommitID().Version),
 	}, nil
 }
 

state/trie.go

@@ -8,6 +8,8 @@ import (
 	ethcmn "github.com/ethereum/go-ethereum/common"
 	ethdb "github.com/ethereum/go-ethereum/ethdb"
 	ethtrie "github.com/ethereum/go-ethereum/trie"
+
+	lru "github.com/hashicorp/golang-lru"
 )
 
 const (
@@ -25,6 +27,8 @@ type Trie struct {
 	// ordering.
 	storageCache store.CacheKVStore
 
+	dataCache *lru.Cache
+
 	// Store is an IAVL KV store that is part of a larger store except it used
 	// for a specific prefix. It will either be an accountsCache or a
 	// storageCache.
@@ -64,8 +68,13 @@ func (t *Trie) TryGet(key []byte) ([]byte, error) {
 	if t.IsStorageTrie() {
 		key = t.prefixKey(key)
 	}
-
+	keyStr := string(key)
-	return t.store.Get(key), nil
+	if cached, ok := t.dataCache.Get(keyStr); ok {
+		return cached.([]byte), nil
+	}
+	value := t.store.Get(key)
+	t.dataCache.Add(keyStr, value)
+	return value, nil
 }
 
 // TryUpdate implements the Ethereum state.Trie interface. It associates a
@@ -83,6 +92,7 @@ func (t *Trie) TryUpdate(key, value []byte) error {
 	}
 
 	t.store.Set(key, value)
+	t.dataCache.Add(string(key), value)
 	return nil
 }
 
@@ -98,6 +108,7 @@ func (t *Trie) TryDelete(key []byte) error {
 	}
 
 	t.store.Delete(key)
+	t.dataCache.Remove(string(key))
 	return nil
 }
 

test/run.go

@@ -19,6 +19,7 @@ var (
 	cpuprofile = flag.String("cpu-profile", "", "write cpu profile `file`")
 	blockchain = flag.String("blockchain", "data/blockchain", "file containing blocks to load")
 	datadir    = flag.String("datadir", path.Join(os.Getenv("HOME"), ".ethermint"), "directory for ethermint data")
+	cachesize  = flag.Int("cachesize", 1024*1024, "number of key-value pairs for the state stored in memory")
 )
 
 func main() {
@@ -51,7 +52,7 @@ func main() {
 	stateDB := dbm.NewDB("state", dbm.LevelDBBackend, *datadir)
 	codeDB := dbm.NewDB("code", dbm.LevelDBBackend, *datadir)
 
-	ethermintDB, err := state.NewDatabase(stateDB, codeDB)
+	ethermintDB, err := state.NewDatabase(stateDB, codeDB, *cachesize)
 	if err != nil {
 		panic(fmt.Sprintf("failed to initialize geth Database: %v", err))
 	}