| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.tuweni.eth.repository |
| |
| import org.apache.tuweni.bytes.Bytes |
| import org.apache.tuweni.bytes.Bytes32 |
| import org.apache.tuweni.eth.AccountState |
| import org.apache.tuweni.eth.Address |
| import org.apache.tuweni.eth.Hash |
| import org.apache.tuweni.kv.CascadingKeyValueStore |
| import org.apache.tuweni.kv.MapKeyValueStore |
| import org.apache.tuweni.trie.MerkleStorage |
| import org.apache.tuweni.trie.StoredMerklePatriciaTrie |
| |
| /** |
| * A state repository that keeps changes made to the underlying storage in memory. |
| */ |
| class TransientStateRepository(val repository: BlockchainRepository) : StateRepository { |
| |
| val transientWorldStateStore = MapKeyValueStore<Bytes, Bytes>() |
| |
| val transientState = CascadingKeyValueStore(transientWorldStateStore, repository.stateStore) |
| val transientWorldState: StoredMerklePatriciaTrie<Bytes> |
| |
| init { |
| val stateRoot = repository.worldState!!.rootHash() |
| transientWorldState = StoredMerklePatriciaTrie.storingBytes( |
| object : MerkleStorage { |
| override suspend fun get(hash: Bytes32): Bytes? { |
| return transientState.get(hash) |
| } |
| |
| override suspend fun put(hash: Bytes32, content: Bytes) { |
| transientState.put(hash, content) |
| } |
| }, |
| stateRoot |
| ) |
| } |
| |
| override suspend fun getAccount(address: Address): AccountState? = |
| transientWorldState.get(Hash.hash(address))?.let { AccountState.fromBytes(it) } |
| |
| override suspend fun accountsExists(address: Address): Boolean { |
| return null != getAccount(address) |
| } |
| |
| override suspend fun getAccountStoreValue(address: Address, key: Bytes32): Bytes? { |
| val accountState = getAccount(address) ?: return null |
| val tree = StoredMerklePatriciaTrie.storingBytes( |
| object : MerkleStorage { |
| override suspend fun get(hash: Bytes32): Bytes? { |
| return transientState.get(hash) |
| } |
| |
| override suspend fun put(hash: Bytes32, content: Bytes) { |
| transientState.put(hash, content) |
| } |
| }, |
| accountState.storageRoot |
| ) |
| return tree.get(key) |
| } |
| |
| override suspend fun storeAccountValue(address: Address, key: Bytes32, value: Bytes) { |
| val addrHash = Hash.hash(address) |
| val accountState = transientWorldState.get(addrHash)?.let { AccountState.fromBytes(it) } ?: newAccountState() |
| val tree = StoredMerklePatriciaTrie.storingBytes( |
| object : MerkleStorage { |
| override suspend fun get(hash: Bytes32): Bytes? { |
| return transientState.get(hash) |
| } |
| |
| override suspend fun put(hash: Bytes32, content: Bytes) { |
| transientState.put(hash, content) |
| } |
| }, |
| accountState.storageRoot |
| ) |
| tree.put(key, value) |
| val newAccountState = AccountState(accountState.nonce, accountState.balance, Hash.fromBytes(tree.rootHash()), accountState.codeHash) |
| transientWorldState.put(addrHash, newAccountState.toBytes()) |
| } |
| |
| override suspend fun deleteAccountStore(address: Address, key: Bytes32) { |
| val addrHash = Hash.hash(address) |
| val accountState = transientWorldState.get(addrHash)?.let { AccountState.fromBytes(it) } ?: newAccountState() |
| val tree = StoredMerklePatriciaTrie.storingBytes( |
| object : MerkleStorage { |
| override suspend fun get(hash: Bytes32): Bytes? { |
| return transientState.get(hash) |
| } |
| |
| override suspend fun put(hash: Bytes32, content: Bytes) { |
| transientState.put(hash, content) |
| } |
| }, |
| accountState.storageRoot |
| ) |
| tree.remove(key) |
| val newAccountState = AccountState(accountState.nonce, accountState.balance, Hash.fromBytes(tree.rootHash()), accountState.codeHash) |
| transientWorldState.put(addrHash, newAccountState.toBytes()) |
| } |
| |
| override suspend fun getAccountCode(address: Address): Bytes? { |
| val addressHash = Hash.hash(address) |
| val accountStateBytes = transientWorldState.get(addressHash) |
| if (accountStateBytes == null) { |
| return null |
| } |
| val accountState = AccountState.fromBytes(accountStateBytes) |
| return transientState.get(accountState.codeHash) |
| } |
| |
| override suspend fun destroyAccount(address: Address) { |
| transientWorldState.remove(Hash.hash(address)) |
| } |
| |
| override suspend fun storeAccount(address: Address, account: AccountState) { |
| transientWorldState.put(Hash.hash(address), account.toBytes()) |
| } |
| |
| override suspend fun storeCode(code: Bytes) { |
| transientState.put(Hash.hash(code), code) |
| } |
| |
| override fun stateRootHash(): Bytes32 = transientWorldState.rootHash() |
| |
| /** |
| * Apply changes of this repository to the blockchain repository. |
| */ |
| suspend fun applyChanges() { |
| transientState.applyChanges() |
| } |
| |
| suspend fun dump(maxAccounts: Int): Set<Bytes> = transientWorldState.collect(maxAccounts) { |
| try { |
| AccountState.fromBytes(it) |
| true |
| } catch (e: Exception) { |
| false |
| } |
| } |
| } |