136 lines
4.8 KiB
Nim
136 lines
4.8 KiB
Nim
# Nimbus
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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sequtils, tables,
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eth_common, nimcrypto, rlp, eth_trie/[hexary, memdb],
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../constants, ../errors, ../validation, ../account, ../logging
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type
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AccountStateDB* = ref object
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trie: SecureHexaryTrie
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proc rootHash*(accountDb: AccountStateDB): KeccakHash =
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accountDb.trie.rootHash
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# proc `rootHash=`*(db: var AccountStateDB, value: string) =
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# TODO: self.Trie.rootHash = value
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proc newAccountStateDB*(backingStore: TrieDatabaseRef,
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root: KeccakHash, readOnly: bool = false): AccountStateDB =
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result.new()
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result.trie = initSecureHexaryTrie(backingStore, root)
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proc logger*(db: AccountStateDB): Logger =
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logging.getLogger("db.State")
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template createRangeFromAddress(address: EthAddress): ByteRange =
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## XXX: The name of this proc is intentionally long, because it
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## performs a memory allocation and data copying that may be eliminated
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## in the future. Avoid renaming it to something similar as `toRange`, so
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## it can remain searchable in the code.
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toRange(@address)
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proc getAccount(db: AccountStateDB, address: EthAddress): Account =
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let recordFound = db.trie.get(createRangeFromAddress address)
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if recordFound.len > 0:
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result = rlp.decode(recordFound, Account)
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else:
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result = newAccount()
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proc setAccount*(db: AccountStateDB, address: EthAddress, account: Account) =
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db.trie.put createRangeFromAddress(address), rlp.encode(account)
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proc getCodeHash*(db: AccountStateDB, address: EthAddress): Hash256 =
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let account = db.getAccount(address)
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result = account.codeHash
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proc getBalance*(db: AccountStateDB, address: EthAddress): UInt256 =
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let account = db.getAccount(address)
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account.balance
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proc setBalance*(db: var AccountStateDB, address: EthAddress, balance: UInt256) =
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var account = db.getAccount(address)
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account.balance = balance
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db.setAccount(address, account)
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proc deltaBalance*(db: var AccountStateDB, address: EthAddress, delta: UInt256) =
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db.setBalance(address, db.getBalance(address) + delta)
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template createTrieKeyFromSlot(slot: UInt256): ByteRange =
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# XXX: This is too expensive. Similar to `createRangeFromAddress`
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# Converts a number to hex big-endian representation including
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# prefix and leading zeros:
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@(keccak256.digest(slot.toByteArrayBE).data).toRange
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# Original py-evm code:
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# pad32(int_to_big_endian(slot))
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template getAccountTrie(stateDb: AccountStateDB, account: Account): auto =
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initSecureHexaryTrie(HexaryTrie(stateDb.trie).db, account.storageRoot)
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proc setStorage*(db: var AccountStateDB,
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address: EthAddress,
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slot: UInt256, value: UInt256) =
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#validateGte(value, 0, title="Storage Value")
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#validateGte(slot, 0, title="Storage Slot")
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var account = db.getAccount(address)
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var accountTrie = getAccountTrie(db, account)
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let slotAsKey = createTrieKeyFromSlot slot
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if value > 0:
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let encodedValue = rlp.encode value
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accountTrie.put(slotAsKey, encodedValue)
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else:
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accountTrie.del(slotAsKey)
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account.storageRoot = accountTrie.rootHash
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db.setAccount(address, account)
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proc getStorage*(db: AccountStateDB, address: EthAddress, slot: UInt256): (UInt256, bool) =
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let
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account = db.getAccount(address)
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slotAsKey = createTrieKeyFromSlot slot
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accountTrie = getAccountTrie(db, account)
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let
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foundRecord = accountTrie.get(slotAsKey)
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if foundRecord.len > 0:
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result = (rlp.decode(foundRecord, UInt256), true)
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else:
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result = (0.u256, false)
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proc setNonce*(db: var AccountStateDB, address: EthAddress, newNonce: UInt256) =
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var account = db.getAccount(address)
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if newNonce != account.nonce:
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account.nonce = newNonce
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db.setAccount(address, account)
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proc getNonce*(db: AccountStateDB, address: EthAddress): UInt256 =
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let account = db.getAccount(address)
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account.nonce
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proc toByteRange_Unnecessary*(h: KeccakHash): ByteRange =
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## XXX: Another proc used to mark unnecessary conversions it the code
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var s = @(h.data)
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return s.toRange
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proc setCode*(db: var AccountStateDB, address: EthAddress, code: ByteRange) =
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var account = db.getAccount(address)
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let newCodeHash = keccak256.digest code.toOpenArray
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if newCodeHash != account.codeHash:
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account.codeHash = newCodeHash
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# XXX: this uses the journaldb in py-evm
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db.trie.put(account.codeHash.toByteRange_Unnecessary, code)
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db.setAccount(address, account)
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proc getCode*(db: AccountStateDB, address: EthAddress): ByteRange =
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let codeHash = db.getCodeHash(address)
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result = db.trie.get(codeHash.toByteRange_Unnecessary)
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