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Introduced multiStore

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This commit is contained in:
Alexey Akhunov 2018-06-15 11:05:12 +01:00
parent dbb16ce486
commit 00ec31f408
1 changed files with 28 additions and 12 deletions
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40
main.go
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@ -10,22 +10,37 @@ import (
dbm "github.com/tendermint/tmlibs/db" dbm "github.com/tendermint/tmlibs/db"
"github.com/cosmos/cosmos-sdk/store" "github.com/cosmos/cosmos-sdk/store"
"github.com/cosmos/cosmos-sdk/types"
)
var (
// Key for the sub-store with Ethereum accounts
AccountsKey= types.NewKVStoreKey("account")
// Key for the sub-store with storage data of Ethereum contracts
StorageKey = types.NewKVStoreKey("storage")
) )
// Implementation of eth_state.Database // Implementation of eth_state.Database
type OurDatabase struct { type OurDatabase struct {
st store.CommitStore stateStore store.CommitMultiStore // For the history of accounts <balance, nonce, storage root hash, code hash>
// Also, for the history of contract data (effects of SSTORE instruction)
lookupDb dbm.DB // Maping [accounts_trie_root_hash] => <version_id>.
// This mapping exists so that we can implement OpenTrie function of the state.Database interface
// Also mapping [storage_trie_root_hash] => <contract_address, version_id>
// This mapping exists so that we can implement OpenStorageTrie function of the state.Database interface
} }
func OurNewDatabase(db dbm.DB, id store.CommitID) (od *OurDatabase, err error) { func OurNewDatabase(stateDb, lookupDb dbm.DB) *OurDatabase {
od = &OurDatabase{} od := &OurDatabase{}
if od.st, err = store.LoadIAVLStore(db, id); err != nil { od.stateStore = store.NewCommitMultiStore(stateDb)
return nil, err od.stateStore.MountStoreWithDB(AccountsKey, types.StoreTypeIAVL, nil)
} od.stateStore.MountStoreWithDB(StorageKey, types.StoreTypeIAVL, nil)
return od.lookupDb = lookupDb
return od
} }
func (od *OurDatabase) OpenTrie(root eth_common.Hash) (eth_state.Trie, error) { func (od *OurDatabase) OpenTrie(root eth_common.Hash) (eth_state.Trie, error) {
// Need to map root hash to the CommitID to be able to load the trie
return &OurTrie{}, nil return &OurTrie{}, nil
} }
@ -51,6 +66,9 @@ func (od *OurDatabase) TrieDB() *eth_trie.Database {
// Implementation of eth_state.Trie // Implementation of eth_state.Trie
type OurTrie struct { type OurTrie struct {
// This is essentially part of the KVStore for a specific prefix
st store.KVStore
prefix []byte
} }
func (ot *OurTrie) TryGet(key []byte) ([]byte, error) { func (ot *OurTrie) TryGet(key []byte) ([]byte, error) {
@ -87,11 +105,9 @@ func (ot *OurTrie) Prove(key []byte, fromLevel uint, proofDb eth_ethdb.Putter) e
func main() { func main() {
fmt.Printf("Instantiating state.Database\n") fmt.Printf("Instantiating state.Database\n")
db := dbm.NewDB("test" /* name */, dbm.MemDBBackend, "" /* dir */) stateDb := dbm.NewDB("state" /* name */, dbm.MemDBBackend, "" /* dir */)
lookupDb := dbm.NewDB("lookup" /* name */, dbm.MemDBBackend, "" /* dir */)
var d eth_state.Database var d eth_state.Database
var err error d = OurNewDatabase(stateDb, lookupDb)
if d, err = OurNewDatabase(db, store.CommitID{}); err != nil {
panic(err)
}
d.OpenTrie(eth_common.Hash{}) d.OpenTrie(eth_common.Hash{})
} }