class AccountDB(BaseAccountDB):
logger = cast(ExtendedDebugLogger,
logging.getLogger('eth.db.account.AccountDB'))
def __init__(self,
db: BaseDB,
state_root: Hash32 = BLANK_ROOT_HASH) -> None:
r"""
Internal implementation details (subject to rapid change):
Database entries go through several pipes, like so...
.. code::
-> hash-trie -> storage lookups
/
db > _batchdb ---------------------------> _journaldb ----------------> code lookups
\
-> _batchtrie -> _trie -> _trie_cache -> _journaltrie --------------> account lookups
Journaling sequesters writes at the _journal* attrs ^, until persist is called.
_batchtrie enables us to prune all trie changes while building
state, without deleting old trie roots.
_batchdb and _batchtrie together enable us to make the state root,
without saving everything to the database.
_journaldb is a journaling of the keys and values used to store
code and account storage.
_trie is a hash-trie, used to generate the state root
_trie_cache is a cache tied to the state root of the trie. It
is important that this cache is checked *after* looking for
the key in _journaltrie, because the cache is only invalidated
after a state root change.
_journaltrie is a journaling of the accounts (an address->rlp mapping,
rather than the nodes stored by the trie). This enables
a squashing of all account changes before pushing them into the trie.
.. NOTE:: There is an opportunity to do something similar for storage
AccountDB synchronizes the snapshot/revert/persist of both of the
journals.
"""
self._batchdb = BatchDB(db)
self._batchtrie = BatchDB(db)
self._journaldb = JournalDB(self._batchdb)
self._trie = HashTrie(
HexaryTrie(self._batchtrie, state_root, prune=True))
self._trie_cache = CacheDB(self._trie)
self._journaltrie = JournalDB(self._trie_cache)
self._account_cache = LRU(2048)
@property
def state_root(self) -> Hash32:
return self._trie.root_hash
@state_root.setter
def state_root(self, value: Hash32) -> None:
self._trie_cache.reset_cache()
self._trie.root_hash = value
def has_root(self, state_root: bytes) -> bool:
return state_root in self._batchtrie
#
# Storage
#
def get_storage(self,
address: Address,
slot: int,
from_journal: bool = True) -> int:
validate_canonical_address(address, title="Storage Address")
validate_uint256(slot, title="Storage Slot")
account = self._get_account(address, from_journal)
storage = HashTrie(HexaryTrie(self._journaldb, account.storage_root))
slot_as_key = pad32(int_to_big_endian(slot))
if slot_as_key in storage:
encoded_value = storage[slot_as_key]
return rlp.decode(encoded_value, sedes=rlp.sedes.big_endian_int)
else:
return 0
def set_storage(self, address: Address, slot: int, value: int) -> None:
validate_uint256(value, title="Storage Value")
validate_uint256(slot, title="Storage Slot")
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
storage = HashTrie(HexaryTrie(self._journaldb, account.storage_root))
slot_as_key = pad32(int_to_big_endian(slot))
if value:
encoded_value = rlp.encode(value)
storage[slot_as_key] = encoded_value
else:
del storage[slot_as_key]
self._set_account(address,
account.copy(storage_root=storage.root_hash))
def delete_storage(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
self._set_account(address, account.copy(storage_root=BLANK_ROOT_HASH))
#
# Balance
#
def get_balance(self, address: Address) -> int:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.balance
def set_balance(self, address: Address, balance: int) -> None:
validate_canonical_address(address, title="Storage Address")
validate_uint256(balance, title="Account Balance")
account = self._get_account(address)
self._set_account(address, account.copy(balance=balance))
#
# Nonce
#
def get_nonce(self, address: Address) -> int:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.nonce
def set_nonce(self, address: Address, nonce: int) -> None:
validate_canonical_address(address, title="Storage Address")
validate_uint256(nonce, title="Nonce")
account = self._get_account(address)
self._set_account(address, account.copy(nonce=nonce))
def increment_nonce(self, address: Address) -> None:
current_nonce = self.get_nonce(address)
self.set_nonce(address, current_nonce + 1)
#
# Code
#
def get_code(self, address: Address) -> bytes:
validate_canonical_address(address, title="Storage Address")
try:
return self._journaldb[self.get_code_hash(address)]
except KeyError:
return b""
def set_code(self, address: Address, code: bytes) -> None:
validate_canonical_address(address, title="Storage Address")
validate_is_bytes(code, title="Code")
account = self._get_account(address)
code_hash = keccak(code)
self._journaldb[code_hash] = code
self._set_account(address, account.copy(code_hash=code_hash))
def get_code_hash(self, address: Address) -> Hash32:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.code_hash
def delete_code(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
self._set_account(address, account.copy(code_hash=EMPTY_SHA3))
#
# Account Methods
#
def account_has_code_or_nonce(self, address: Address) -> bool:
return self.get_nonce(address) != 0 or self.get_code_hash(
address) != EMPTY_SHA3
def delete_account(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
if address in self._account_cache:
del self._account_cache[address]
del self._journaltrie[address]
def account_exists(self, address: Address) -> bool:
validate_canonical_address(address, title="Storage Address")
return self._journaltrie.get(address, b'') != b''
def touch_account(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
self._set_account(address, account)
def account_is_empty(self, address: Address) -> bool:
return not self.account_has_code_or_nonce(
address) and self.get_balance(address) == 0
#
# Internal
#
def _get_account(self,
address: Address,
from_journal: bool = True) -> Account:
if from_journal and address in self._account_cache:
return self._account_cache[address]
rlp_account = (self._journaltrie if from_journal else
self._trie_cache).get(address, b'')
if rlp_account:
account = rlp.decode(rlp_account, sedes=Account)
else:
account = Account()
if from_journal:
self._account_cache[address] = account
return account
def _set_account(self, address: Address, account: Account) -> None:
self._account_cache[address] = account
rlp_account = rlp.encode(account, sedes=Account)
self._journaltrie[address] = rlp_account
#
# Record and discard API
#
def record(self) -> Tuple[UUID, UUID]:
return (self._journaldb.record(), self._journaltrie.record())
def discard(self, changeset: Tuple[UUID, UUID]) -> None:
db_changeset, trie_changeset = changeset
self._journaldb.discard(db_changeset)
self._journaltrie.discard(trie_changeset)
self._account_cache.clear()
def commit(self, changeset: Tuple[UUID, UUID]) -> None:
db_changeset, trie_changeset = changeset
self._journaldb.commit(db_changeset)
self._journaltrie.commit(trie_changeset)
def make_state_root(self) -> Hash32:
self.logger.debug2("Generating AccountDB trie")
self._journaldb.persist()
self._journaltrie.persist()
return self.state_root
def persist(self) -> None:
self.make_state_root()
self._batchtrie.commit(apply_deletes=False)
self._batchdb.commit(apply_deletes=True)
def _log_pending_accounts(self) -> None:
accounts_displayed = set() # type: Set[bytes]
queued_changes = self._journaltrie.journal.journal_data.items()
# mypy bug for ordered dict reversibility: https://github.com/python/typeshed/issues/2078
for _, accounts in reversed(queued_changes):
for address in accounts:
if address in accounts_displayed:
continue
else:
accounts_displayed.add(address)
account = self._get_account(Address(address))
self.logger.debug2(
"Account %s: balance %d, nonce %d, storage root %s, code hash %s",
encode_hex(address),
account.balance,
account.nonce,
encode_hex(account.storage_root),
encode_hex(account.code_hash),
)
class AccountDB(BaseAccountDB):
logger = cast(ExtendedDebugLogger, logging.getLogger('eth.db.account.AccountDB'))
def __init__(self, db: BaseAtomicDB, state_root: Hash32=BLANK_ROOT_HASH) -> None:
r"""
Internal implementation details (subject to rapid change):
Database entries go through several pipes, like so...
.. code::
db > _batchdb ---------------------------> _journaldb ----------------> code lookups
\
-> _batchtrie -> _trie -> _trie_cache -> _journaltrie --------------> account lookups
Journaling sequesters writes at the _journal* attrs ^, until persist is called.
_batchtrie enables us to prune all trie changes while building
state, without deleting old trie roots.
_batchdb and _batchtrie together enable us to make the state root,
without saving everything to the database.
_journaldb is a journaling of the keys and values used to store
code and account storage.
_trie is a hash-trie, used to generate the state root
_trie_cache is a cache tied to the state root of the trie. It
is important that this cache is checked *after* looking for
the key in _journaltrie, because the cache is only invalidated
after a state root change.
_journaltrie is a journaling of the accounts (an address->rlp mapping,
rather than the nodes stored by the trie). This enables
a squashing of all account changes before pushing them into the trie.
.. NOTE:: StorageDB works similarly
AccountDB synchronizes the snapshot/revert/persist of both of the
journals.
"""
self._raw_store_db = db
self._batchdb = BatchDB(db)
self._batchtrie = BatchDB(db)
self._journaldb = JournalDB(self._batchdb)
self._trie = HashTrie(HexaryTrie(self._batchtrie, state_root, prune=True))
self._trie_cache = CacheDB(self._trie)
self._journaltrie = JournalDB(self._trie_cache)
self._account_cache = LRU(2048)
self._account_stores = {} # type: Dict[Address, AccountStorageDB]
self._dirty_accounts = set() # type: Set[Address]
@property
def state_root(self) -> Hash32:
return self._trie.root_hash
@state_root.setter
def state_root(self, value: Hash32) -> None:
if self._trie.root_hash != value:
self._trie_cache.reset_cache()
self._trie.root_hash = value
def has_root(self, state_root: bytes) -> bool:
return state_root in self._batchtrie
#
# Storage
#
def get_storage(self, address: Address, slot: int, from_journal: bool=True) -> int:
validate_canonical_address(address, title="Storage Address")
validate_uint256(slot, title="Storage Slot")
account_store = self._get_address_store(address)
return account_store.get(slot, from_journal)
def set_storage(self, address: Address, slot: int, value: int) -> None:
validate_uint256(value, title="Storage Value")
validate_uint256(slot, title="Storage Slot")
validate_canonical_address(address, title="Storage Address")
account_store = self._get_address_store(address)
self._dirty_accounts.add(address)
account_store.set(slot, value)
def delete_storage(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
self._set_storage_root(address, BLANK_ROOT_HASH)
self._wipe_storage(address)
def _wipe_storage(self, address: Address) -> None:
"""
Wipe out the storage, without explicitly handling the storage root update
"""
account_store = self._get_address_store(address)
self._dirty_accounts.add(address)
account_store.delete()
def _get_address_store(self, address: Address) -> AccountStorageDB:
if address in self._account_stores:
store = self._account_stores[address]
else:
storage_root = self._get_storage_root(address)
store = AccountStorageDB(self._raw_store_db, storage_root, address)
self._account_stores[address] = store
return store
def _dirty_account_stores(self) -> Iterable[Tuple[Address, AccountStorageDB]]:
for address in self._dirty_accounts:
store = self._account_stores[address]
yield address, store
@to_tuple
def _get_changed_roots(self) -> Iterable[Tuple[Address, Hash32]]:
# list all the accounts that were changed, and their new storage roots
for address, store in self._dirty_account_stores():
if store.has_changed_root:
yield address, store.get_changed_root()
def _get_storage_root(self, address: Address) -> Hash32:
account = self._get_account(address)
return account.storage_root
def _set_storage_root(self, address: Address, new_storage_root: Hash32) -> None:
account = self._get_account(address)
self._set_account(address, account.copy(storage_root=new_storage_root))
def _validate_flushed_storage(self, address: Address, store: AccountStorageDB) -> None:
if store.has_changed_root:
actual_storage_root = self._get_storage_root(address)
expected_storage_root = store.get_changed_root()
if expected_storage_root != actual_storage_root:
raise ValidationError(
"Storage root was not saved to account before trying to persist roots. "
"Account %r had storage %r, but should be %r." % (
address,
actual_storage_root,
expected_storage_root,
)
)
#
# Balance
#
def get_balance(self, address: Address) -> int:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.balance
def set_balance(self, address: Address, balance: int) -> None:
validate_canonical_address(address, title="Storage Address")
validate_uint256(balance, title="Account Balance")
account = self._get_account(address)
self._set_account(address, account.copy(balance=balance))
#
# Nonce
#
def get_nonce(self, address: Address) -> int:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.nonce
def set_nonce(self, address: Address, nonce: int) -> None:
validate_canonical_address(address, title="Storage Address")
validate_uint256(nonce, title="Nonce")
account = self._get_account(address)
self._set_account(address, account.copy(nonce=nonce))
def increment_nonce(self, address: Address) -> None:
current_nonce = self.get_nonce(address)
self.set_nonce(address, current_nonce + 1)
#
# Code
#
def get_code(self, address: Address) -> bytes:
validate_canonical_address(address, title="Storage Address")
try:
return self._journaldb[self.get_code_hash(address)]
except KeyError:
return b""
def set_code(self, address: Address, code: bytes) -> None:
validate_canonical_address(address, title="Storage Address")
validate_is_bytes(code, title="Code")
account = self._get_account(address)
code_hash = keccak(code)
self._journaldb[code_hash] = code
self._set_account(address, account.copy(code_hash=code_hash))
def get_code_hash(self, address: Address) -> Hash32:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
return account.code_hash
def delete_code(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
self._set_account(address, account.copy(code_hash=EMPTY_SHA3))
#
# Account Methods
#
def account_has_code_or_nonce(self, address: Address) -> bool:
return self.get_nonce(address) != 0 or self.get_code_hash(address) != EMPTY_SHA3
def delete_account(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
if address in self._account_cache:
del self._account_cache[address]
del self._journaltrie[address]
self._wipe_storage(address)
def account_exists(self, address: Address) -> bool:
validate_canonical_address(address, title="Storage Address")
return self._journaltrie.get(address, b'') != b''
def touch_account(self, address: Address) -> None:
validate_canonical_address(address, title="Storage Address")
account = self._get_account(address)
self._set_account(address, account)
def account_is_empty(self, address: Address) -> bool:
return not self.account_has_code_or_nonce(address) and self.get_balance(address) == 0
#
# Internal
#
def _get_account(self, address: Address, from_journal: bool=True) -> Account:
if from_journal and address in self._account_cache:
return self._account_cache[address]
rlp_account = (self._journaltrie if from_journal else self._trie_cache).get(address, b'')
if rlp_account:
account = rlp.decode(rlp_account, sedes=Account)
else:
account = Account()
if from_journal:
self._account_cache[address] = account
return account
def _set_account(self, address: Address, account: Account) -> None:
self._account_cache[address] = account
rlp_account = rlp.encode(account, sedes=Account)
self._journaltrie[address] = rlp_account
#
# Record and discard API
#
def record(self) -> UUID:
changeset_id = self._journaldb.record()
self._journaltrie.record(changeset_id)
for _, store in self._dirty_account_stores():
store.record(changeset_id)
return changeset_id
def discard(self, changeset: UUID) -> None:
self._journaldb.discard(changeset)
self._journaltrie.discard(changeset)
self._account_cache.clear()
for _, store in self._dirty_account_stores():
store.discard(changeset)
def commit(self, changeset: UUID) -> None:
self._journaldb.commit(changeset)
self._journaltrie.commit(changeset)
for _, store in self._dirty_account_stores():
store.commit(changeset)
def make_state_root(self) -> Hash32:
for _, store in self._dirty_account_stores():
store.make_storage_root()
for address, storage_root in self._get_changed_roots():
self.logger.debug2(
"Updating account 0x%s to storage root 0x%s",
address.hex(),
storage_root.hex(),
)
self._set_storage_root(address, storage_root)
self._journaldb.persist()
self._journaltrie.persist()
return self.state_root
def persist(self) -> None:
self.make_state_root()
# persist storage
with self._raw_store_db.atomic_batch() as write_batch:
for address, store in self._dirty_account_stores():
self._validate_flushed_storage(address, store)
store.persist(write_batch)
for address, new_root in self._get_changed_roots():
if new_root not in self._raw_store_db and new_root != BLANK_ROOT_HASH:
raise ValidationError(
"After persisting storage trie, a root node was not found. "
"State root for account 0x%s is missing for hash 0x%s." % (
address.hex(),
new_root.hex(),
)
)
# reset local storage trackers
self._account_stores = {}
self._dirty_accounts = set()
# persist accounts
self._validate_generated_root()
with self._raw_store_db.atomic_batch() as write_batch:
self._batchtrie.commit_to(write_batch, apply_deletes=False)
self._batchdb.commit_to(write_batch, apply_deletes=False)
def _validate_generated_root(self) -> None:
db_diff = self._journaldb.diff()
if len(db_diff):
raise ValidationError(
"AccountDB had a dirty db when it needed to be clean: %r" % db_diff
)
trie_diff = self._journaltrie.diff()
if len(trie_diff):
raise ValidationError(
"AccountDB had a dirty trie when it needed to be clean: %r" % trie_diff
)
def _log_pending_accounts(self) -> None:
accounts_displayed = set() # type: Set[bytes]
queued_changes = self._journaltrie.journal.journal_data.items()
# mypy bug for ordered dict reversibility: https://github.com/python/typeshed/issues/2078
for _, accounts in reversed(queued_changes):
for address in accounts:
if address in accounts_displayed:
continue
else:
accounts_displayed.add(address)
account = self._get_account(Address(address))
self.logger.debug2(
"Account %s: balance %d, nonce %d, storage root %s, code hash %s",
encode_hex(address),
account.balance,
account.nonce,
encode_hex(account.storage_root),
encode_hex(account.code_hash),
)