113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
package main
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import (
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"fmt"
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eth_common "github.com/ethereum/go-ethereum/common"
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eth_state "github.com/ethereum/go-ethereum/core/state"
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eth_ethdb "github.com/ethereum/go-ethereum/ethdb"
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eth_trie "github.com/ethereum/go-ethereum/trie"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/cosmos/cosmos-sdk/store"
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"github.com/cosmos/cosmos-sdk/types"
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)
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var (
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// Key for the sub-store with Ethereum accounts
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AccountsKey= types.NewKVStoreKey("account")
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// Key for the sub-store with storage data of Ethereum contracts
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StorageKey = types.NewKVStoreKey("storage")
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)
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// Implementation of eth_state.Database
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type OurDatabase struct {
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stateStore store.CommitMultiStore // For the history of accounts <balance, nonce, storage root hash, code hash>
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// Also, for the history of contract data (effects of SSTORE instruction)
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lookupDb dbm.DB // Maping [accounts_trie_root_hash] => <version_id>.
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// This mapping exists so that we can implement OpenTrie function of the state.Database interface
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// Also mapping [storage_trie_root_hash] => <contract_address, version_id>
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// This mapping exists so that we can implement OpenStorageTrie function of the state.Database interface
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}
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func OurNewDatabase(stateDb, lookupDb dbm.DB) *OurDatabase {
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od := &OurDatabase{}
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od.stateStore = store.NewCommitMultiStore(stateDb)
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od.stateStore.MountStoreWithDB(AccountsKey, types.StoreTypeIAVL, nil)
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od.stateStore.MountStoreWithDB(StorageKey, types.StoreTypeIAVL, nil)
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od.lookupDb = lookupDb
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return od
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}
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func (od *OurDatabase) OpenTrie(root eth_common.Hash) (eth_state.Trie, error) {
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// Need to map root hash to the CommitID to be able to load the trie
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return &OurTrie{}, nil
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}
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func (od *OurDatabase) OpenStorageTrie(addrHash, root eth_common.Hash) (eth_state.Trie, error) {
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return nil, nil
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}
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func (od *OurDatabase) CopyTrie(eth_state.Trie) eth_state.Trie {
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return nil
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}
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func (od *OurDatabase) ContractCode(addrHash, codeHash eth_common.Hash) ([]byte, error) {
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return nil, nil
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}
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func (od *OurDatabase) ContractCodeSize(addrHash, codeHash eth_common.Hash) (int, error) {
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return 0, nil
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}
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func (od *OurDatabase) TrieDB() *eth_trie.Database {
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return nil
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}
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// Implementation of eth_state.Trie
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type OurTrie struct {
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// This is essentially part of the KVStore for a specific prefix
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st store.KVStore
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prefix []byte
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}
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func (ot *OurTrie) TryGet(key []byte) ([]byte, error) {
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return nil, nil
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}
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func (ot *OurTrie) TryUpdate(key, value []byte) error {
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return nil
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}
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func (ot *OurTrie) TryDelete(key []byte) error {
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return nil
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}
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func (ot *OurTrie) Commit(onleaf eth_trie.LeafCallback) (eth_common.Hash, error) {
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return eth_common.Hash{}, nil
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}
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func (ot *OurTrie) Hash() eth_common.Hash {
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return eth_common.Hash{}
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}
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func (ot *OurTrie) NodeIterator(startKey []byte) eth_trie.NodeIterator {
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return nil
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}
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func (ot *OurTrie) GetKey([]byte) []byte {
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return nil
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}
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func (ot *OurTrie) Prove(key []byte, fromLevel uint, proofDb eth_ethdb.Putter) error {
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return nil
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}
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func main() {
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fmt.Printf("Instantiating state.Database\n")
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stateDb := dbm.NewDB("state" /* name */, dbm.MemDBBackend, "" /* dir */)
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lookupDb := dbm.NewDB("lookup" /* name */, dbm.MemDBBackend, "" /* dir */)
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var d eth_state.Database
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d = OurNewDatabase(stateDb, lookupDb)
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d.OpenTrie(eth_common.Hash{})
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} |