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https://github.com/ethereum/go-ethereum.git
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113 lines
3.8 KiB
Go
113 lines
3.8 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package tradingstate
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import (
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"fmt"
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"github.com/XinFinOrg/XDPoSChain/common"
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"github.com/XinFinOrg/XDPoSChain/ethdb"
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"github.com/XinFinOrg/XDPoSChain/trie"
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)
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// Trie cache generation limit after which to evic trie nodes from memory.
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var MaxTrieCacheGen = uint16(120)
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// Database wraps access to tries and contract code.
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type Database interface {
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// OpenTrie opens the main account trie.
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OpenTrie(root common.Hash) (Trie, error)
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// OpenStorageTrie opens the storage trie of an account.
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OpenStorageTrie(stateRoot common.Hash, address common.Address, root common.Hash) (Trie, error)
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// CopyTrie returns an independent copy of the given trie.
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CopyTrie(Trie) Trie
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// ContractCode retrieves a particular contract's code.
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ContractCode(address common.Address, codeHash common.Hash) ([]byte, error)
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// ContractCodeSize retrieves a particular contracts code's size.
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ContractCodeSize(address common.Address, codeHash common.Hash) (int, error)
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// TrieDB retrieves the low level trie database used for data storage.
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TrieDB() *trie.Database
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}
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// Trie is a Ethereum Merkle Trie.
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type Trie interface {
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TryGet(key []byte) ([]byte, error)
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TryGetBestLeftKeyAndValue() ([]byte, []byte, error)
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TryGetAllLeftKeyAndValue(limit []byte) ([][]byte, [][]byte, error)
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TryGetBestRightKeyAndValue() ([]byte, []byte, error)
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TryUpdate(key, value []byte) error
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TryDelete(key []byte) error
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Commit(onleaf trie.LeafCallback) (common.Hash, error)
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Hash() common.Hash
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NodeIterator(startKey []byte) trie.NodeIterator
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GetKey([]byte) []byte // TODO(fjl): remove this when XDCXTrie is removed
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Prove(key []byte, fromLevel uint, proofDb ethdb.KeyValueWriter) error
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}
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// NewDatabase creates a backing store for state. The returned database is safe for
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// concurrent use and retains cached trie nodes in memory. The pool is an optional
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// intermediate trie-node memory pool between the low level storage layer and the
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// high level trie abstraction.
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func NewDatabase(db ethdb.Database) Database {
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return &cachingDB{
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db: trie.NewDatabase(db),
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}
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}
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type cachingDB struct {
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db *trie.Database
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}
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// OpenTrie opens the main account trie.
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func (db *cachingDB) OpenTrie(root common.Hash) (Trie, error) {
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return NewXDCXTrie(root, db.db)
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}
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// OpenStorageTrie opens the storage trie of an account.
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func (db *cachingDB) OpenStorageTrie(stateRoot common.Hash, address common.Address, root common.Hash) (Trie, error) {
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return NewXDCXTrie(root, db.db)
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}
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// CopyTrie returns an independent copy of the given trie.
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func (db *cachingDB) CopyTrie(t Trie) Trie {
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switch t := t.(type) {
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case *XDCXTrie:
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return t.Copy()
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default:
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panic(fmt.Errorf("unknown trie type %T", t))
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}
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}
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// ContractCode retrieves a particular contract's code.
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func (db *cachingDB) ContractCode(address common.Address, codeHash common.Hash) ([]byte, error) {
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return nil, nil
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}
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// ContractCodeSize retrieves a particular contracts code's size.
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func (db *cachingDB) ContractCodeSize(address common.Address, codeHash common.Hash) (int, error) {
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return 0, nil
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}
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// TrieDB retrieves any intermediate trie-node caching layer.
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func (db *cachingDB) TrieDB() *trie.Database {
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return db.db
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}
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