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Add read abstraction to the State (0xPolygon#827)
* Add read abstraction in the state * Add more error context to newTrie
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package itrie | ||
|
|
||
| import ( | ||
| "github.com/0xPolygon/polygon-edge/crypto" | ||
| "github.com/0xPolygon/polygon-edge/state" | ||
| "github.com/0xPolygon/polygon-edge/types" | ||
| "github.com/umbracle/fastrlp" | ||
| ) | ||
|
|
||
| type Snapshot struct { | ||
| state *State | ||
| trie *Trie | ||
| } | ||
|
|
||
| var emptyStateHash = types.StringToHash("0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421") | ||
|
|
||
| func (s *Snapshot) GetStorage(addr types.Address, root types.Hash, rawkey types.Hash) types.Hash { | ||
| var ( | ||
| err error | ||
| trie *Trie | ||
| ) | ||
|
|
||
| if root == emptyStateHash { | ||
| trie = s.state.newTrie() | ||
| } else { | ||
| trie, err = s.state.newTrieAt(root) | ||
| if err != nil { | ||
| return types.Hash{} | ||
| } | ||
| } | ||
|
|
||
| key := crypto.Keccak256(rawkey.Bytes()) | ||
|
|
||
| val, ok := trie.Get(key) | ||
| if !ok { | ||
| return types.Hash{} | ||
| } | ||
|
|
||
| p := &fastrlp.Parser{} | ||
|
|
||
| v, err := p.Parse(val) | ||
| if err != nil { | ||
| return types.Hash{} | ||
| } | ||
|
|
||
| res := []byte{} | ||
| if res, err = v.GetBytes(res[:0]); err != nil { | ||
| return types.Hash{} | ||
| } | ||
|
|
||
| return types.BytesToHash(res) | ||
| } | ||
|
|
||
| func (s *Snapshot) GetAccount(addr types.Address) (*state.Account, error) { | ||
| key := crypto.Keccak256(addr.Bytes()) | ||
|
|
||
| data, ok := s.trie.Get(key) | ||
| if !ok { | ||
| return nil, nil | ||
| } | ||
|
|
||
| var account state.Account | ||
| if err := account.UnmarshalRlp(data); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &account, nil | ||
| } | ||
|
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||
| func (s *Snapshot) GetCode(hash types.Hash) ([]byte, bool) { | ||
| return s.state.GetCode(hash) | ||
| } | ||
|
|
||
| func (s *Snapshot) Commit(objs []*state.Object) (state.Snapshot, []byte) { | ||
| trie, root := s.trie.Commit(objs) | ||
|
|
||
| return &Snapshot{trie: trie, state: s.state}, root | ||
| } |
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