chore: add the wrapper layer of versa

Author: joey0612

core/state/versadb.go

@@ -0,0 +1,104 @@
+package state
+
+import (
+	versa "github.com/bnb-chain/versioned-state-database"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/trie"
+	"github.com/ethereum/go-ethereum/trie/trienode"
+	"github.com/ethereum/go-ethereum/triedb"
+)
+
+// VersaDB is embed in state.cachingDB
+type VersaDB struct {
+	db        versa.DataBase
+	handler   versa.StateHandler
+	rwhandler versa.StateHandler
+	codeDB    ethdb.KeyValueStore
+}
+
+func (v *VersaDB) OpenTrie(root common.Hash) (Trie, error) {
+	// 1. open state, then set v.handler
+	// 2. open root tree, then return
+}
+
+func (v *VersaDB) OpenStorageTrie(stateRoot common.Hash, address common.Address, root common.Hash, trie Trie) (Trie, error) {
+	// 1. get storage tree hash and version, use v.handler from root tree
+	// 2. use tree hash and version open sub tree in versadb.
+}
+
+func (v *VersaDB) CopyTrie(t Trie) Trie {
+	// it used to prefetcher
+	// 1. creaet S_RW state, set v.rwhandler, if have reuse the v.rwhandler
+	// 2. then reopen tree to return
+}
+
+func (v *VersaDB) ContractCode(addr common.Address, codeHash common.Hash) ([]byte, error) {
+	// 1. set to v.codeDB
+}
+
+func (v *VersaDB) ContractCodeSize(addr common.Address, codeHash common.Hash) (int, error) {
+	// 1. get from v.codeDB
+}
+
+func (v *VersaDB) DiskDB() ethdb.KeyValueStore {
+	// return nil, it only used to snapshot
+}
+
+func (v *VersaDB) TrieDB() *triedb.Database {
+	// return nil, it used to snapsync
+}
+
+func (v *VersaDB) NoTries() bool {
+	// return false, not support fastnode
+}
+
+// add method for versa, and for other dbs
+func (v *VersaDB) Flush() error {
+	// return v.db.Flush(v.handler)
+}
+
+// add method for versa, and for other dbs
+func (v *VersaDB) CloseState() error {
+	// call defer CloseState() in state.Commit
+}
+
+// add method for versa, and for other dbs
+func (v *VersaDB) Close() error {
+
+}
+
+// VersaTree used to NewState(root tree) and StateObject(subtree)
+type VersaTree struct {
+	version int64
+	handler versa.TreeHandler
+}
+
+func (vt *VersaTree) GetKey([]byte) []byte {}
+
+func (vt *VersaTree) GetAccount(address common.Address) (*types.StateAccount, error) {}
+
+func (vt *VersaTree) GetStorage(addr common.Address, key []byte) ([]byte, error) {}
+
+func (vt *VersaTree) UpdateAccount(address common.Address, account *types.StateAccount) error {}
+
+func (vt *VersaTree) UpdateStorage(addr common.Address, key, value []byte) error {}
+
+func (vt *VersaTree) DeleteAccount(address common.Address) error {}
+
+func (vt *VersaTree) DeleteStorage(addr common.Address, key []byte) error {}
+
+func (vt *VersaTree) UpdateContractCode(address common.Address, codeHash common.Hash, code []byte) error {
+}
+
+func (vt *VersaTree) Hash() common.Hash {}
+
+func (vt *VersaTree) Commit(collectLeaf bool) (common.Hash, *trienode.NodeSet, error) {}
+
+func (vt *VersaTree) NodeIterator(startKey []byte) (trie.NodeIterator, error) {
+	// 1. return nil, nil, not support, it used to dump cmd
+}
+
+func (vt *VersaTree) Prove(key []byte, proofDb ethdb.KeyValueWriter) error {
+	// 1. return errors.New("not support on versadb "), not support, it used to snapshot
+}