274 lines
12 KiB
Python
274 lines
12 KiB
Python
import struct
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import typing
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import rocksdb
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from typing import Optional
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from scribe.db.common import DB_PREFIXES, COLUMN_SETTINGS
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from scribe.db.revertable import RevertableOpStack, RevertablePut, RevertableDelete
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ROW_TYPES = {}
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class PrefixRowType(type):
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def __new__(cls, name, bases, kwargs):
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klass = super().__new__(cls, name, bases, kwargs)
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if name != "PrefixRow":
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ROW_TYPES[klass.prefix] = klass
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cache_size = klass.cache_size
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COLUMN_SETTINGS[klass.prefix] = {
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'cache_size': cache_size,
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}
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return klass
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class PrefixRow(metaclass=PrefixRowType):
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prefix: bytes
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key_struct: struct.Struct
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value_struct: struct.Struct
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key_part_lambdas = []
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cache_size: int = 1024 * 1024 * 64
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def __init__(self, db: 'rocksdb.DB', op_stack: RevertableOpStack):
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self._db = db
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self._op_stack = op_stack
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self._column_family = self._db.get_column_family(self.prefix)
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if not self._column_family.is_valid:
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raise RuntimeError('column family is not valid')
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def iterate(self, prefix=None, start=None, stop=None, reverse: bool = False, include_key: bool = True,
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include_value: bool = True, fill_cache: bool = True, deserialize_key: bool = True,
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deserialize_value: bool = True):
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if not prefix and not start and not stop:
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prefix = ()
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if prefix is not None:
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prefix = self.pack_partial_key(*prefix)
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if stop is None:
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try:
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stop = (int.from_bytes(prefix, byteorder='big') + 1).to_bytes(len(prefix), byteorder='big')
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except OverflowError:
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stop = (int.from_bytes(prefix, byteorder='big') + 1).to_bytes(len(prefix) + 1, byteorder='big')
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else:
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stop = self.pack_partial_key(*stop)
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else:
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if start is not None:
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start = self.pack_partial_key(*start)
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if stop is not None:
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stop = self.pack_partial_key(*stop)
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if deserialize_key:
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key_getter = lambda k: self.unpack_key(k)
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else:
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key_getter = lambda k: k
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if deserialize_value:
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value_getter = lambda v: self.unpack_value(v)
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else:
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value_getter = lambda v: v
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it = self._db.iterator(
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start or prefix, self._column_family, iterate_lower_bound=(start or prefix),
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iterate_upper_bound=stop, reverse=reverse, include_key=include_key,
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include_value=include_value, fill_cache=fill_cache, prefix_same_as_start=False
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)
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if include_key and include_value:
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for k, v in it:
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yield key_getter(k[1]), value_getter(v)
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elif include_key:
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for k in it:
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yield key_getter(k[1])
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elif include_value:
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for v in it:
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yield value_getter(v)
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else:
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for _ in it:
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yield None
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def get(self, *key_args, fill_cache=True, deserialize_value=True):
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v = self._db.get((self._column_family, self.pack_key(*key_args)), fill_cache=fill_cache)
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if v:
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return v if not deserialize_value else self.unpack_value(v)
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def get_pending(self, *key_args, fill_cache=True, deserialize_value=True):
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packed_key = self.pack_key(*key_args)
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last_op = self._op_stack.get_last_op_for_key(packed_key)
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if last_op:
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if last_op.is_put:
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return last_op.value if not deserialize_value else self.unpack_value(last_op.value)
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else: # it's a delete
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return
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v = self._db.get((self._column_family, packed_key), fill_cache=fill_cache)
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if v:
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return v if not deserialize_value else self.unpack_value(v)
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def stage_put(self, key_args=(), value_args=()):
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self._op_stack.append_op(RevertablePut(self.pack_key(*key_args), self.pack_value(*value_args)))
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def stage_delete(self, key_args=(), value_args=()):
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self._op_stack.append_op(RevertableDelete(self.pack_key(*key_args), self.pack_value(*value_args)))
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@classmethod
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def pack_partial_key(cls, *args) -> bytes:
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return cls.prefix + cls.key_part_lambdas[len(args)](*args)
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@classmethod
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def pack_key(cls, *args) -> bytes:
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return cls.prefix + cls.key_struct.pack(*args)
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@classmethod
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def pack_value(cls, *args) -> bytes:
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return cls.value_struct.pack(*args)
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@classmethod
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def unpack_key(cls, key: bytes):
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assert key[:1] == cls.prefix, f"prefix should be {cls.prefix}, got {key[:1]}"
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return cls.key_struct.unpack(key[1:])
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@classmethod
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def unpack_value(cls, data: bytes):
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return cls.value_struct.unpack(data)
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@classmethod
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def unpack_item(cls, key: bytes, value: bytes):
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return cls.unpack_key(key), cls.unpack_value(value)
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def estimate_num_keys(self) -> int:
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return int(self._db.get_property(b'rocksdb.estimate-num-keys', self._column_family).decode())
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class BasePrefixDB:
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"""
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Base class for a revertable rocksdb database (a rocksdb db where each set of applied changes can be undone)
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"""
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UNDO_KEY_STRUCT = struct.Struct(b'>Q32s')
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PARTIAL_UNDO_KEY_STRUCT = struct.Struct(b'>Q')
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def __init__(self, path, max_open_files=64, secondary_path='', max_undo_depth: int = 200, unsafe_prefixes=None):
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column_family_options = {}
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for prefix in DB_PREFIXES:
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settings = COLUMN_SETTINGS[prefix.value]
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column_family_options[prefix.value] = rocksdb.ColumnFamilyOptions()
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column_family_options[prefix.value].table_factory = rocksdb.BlockBasedTableFactory(
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block_cache=rocksdb.LRUCache(settings['cache_size']),
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)
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self.column_families: typing.Dict[bytes, 'rocksdb.ColumnFamilyHandle'] = {}
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options = rocksdb.Options(
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create_if_missing=True, use_fsync=False, target_file_size_base=33554432,
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max_open_files=max_open_files if not secondary_path else -1, create_missing_column_families=True
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)
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self._db = rocksdb.DB(
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path, options, secondary_name=secondary_path, column_families=column_family_options
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)
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for prefix in DB_PREFIXES:
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cf = self._db.get_column_family(prefix.value)
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if cf is None and not secondary_path:
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self._db.create_column_family(prefix.value, column_family_options[prefix.value])
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cf = self._db.get_column_family(prefix.value)
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self.column_families[prefix.value] = cf
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self._op_stack = RevertableOpStack(self.get, unsafe_prefixes=unsafe_prefixes)
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self._max_undo_depth = max_undo_depth
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def unsafe_commit(self):
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"""
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Write staged changes to the database without keeping undo information
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Changes written cannot be undone
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"""
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try:
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if not len(self._op_stack):
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return
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with self._db.write_batch(sync=True) as batch:
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batch_put = batch.put
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batch_delete = batch.delete
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get_column_family = self.column_families.__getitem__
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for staged_change in self._op_stack:
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column_family = get_column_family(DB_PREFIXES(staged_change.key[:1]).value)
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if staged_change.is_put:
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batch_put((column_family, staged_change.key), staged_change.value)
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else:
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batch_delete((column_family, staged_change.key))
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finally:
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self._op_stack.clear()
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def commit(self, height: int, block_hash: bytes):
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"""
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Write changes for a block height to the database and keep undo information so that the changes can be reverted
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"""
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undo_ops = self._op_stack.get_undo_ops()
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delete_undos = []
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if height > self._max_undo_depth:
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delete_undos.extend(self._db.iterator(
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start=DB_PREFIXES.undo.value + self.PARTIAL_UNDO_KEY_STRUCT.pack(0),
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iterate_upper_bound=DB_PREFIXES.undo.value + self.PARTIAL_UNDO_KEY_STRUCT.pack(height - self._max_undo_depth),
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include_value=False
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))
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try:
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undo_c_f = self.column_families[DB_PREFIXES.undo.value]
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with self._db.write_batch(sync=True) as batch:
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batch_put = batch.put
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batch_delete = batch.delete
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get_column_family = self.column_families.__getitem__
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for staged_change in self._op_stack:
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column_family = get_column_family(DB_PREFIXES(staged_change.key[:1]).value)
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if staged_change.is_put:
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batch_put((column_family, staged_change.key), staged_change.value)
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else:
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batch_delete((column_family, staged_change.key))
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for undo_to_delete in delete_undos:
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batch_delete((undo_c_f, undo_to_delete))
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batch_put((undo_c_f, DB_PREFIXES.undo.value + self.UNDO_KEY_STRUCT.pack(height, block_hash)), undo_ops)
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finally:
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self._op_stack.clear()
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def rollback(self, height: int, block_hash: bytes):
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"""
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Revert changes for a block height
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"""
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undo_key = DB_PREFIXES.undo.value + self.UNDO_KEY_STRUCT.pack(height, block_hash)
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undo_c_f = self.column_families[DB_PREFIXES.undo.value]
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undo_info = self._db.get((undo_c_f, undo_key))
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self._op_stack.apply_packed_undo_ops(undo_info)
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try:
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with self._db.write_batch(sync=True) as batch:
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batch_put = batch.put
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batch_delete = batch.delete
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get_column_family = self.column_families.__getitem__
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for staged_change in self._op_stack:
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column_family = get_column_family(DB_PREFIXES(staged_change.key[:1]).value)
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if staged_change.is_put:
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batch_put((column_family, staged_change.key), staged_change.value)
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else:
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batch_delete((column_family, staged_change.key))
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# batch_delete(undo_key)
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finally:
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self._op_stack.clear()
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def get(self, key: bytes, fill_cache: bool = True) -> Optional[bytes]:
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cf = self.column_families[key[:1]]
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return self._db.get((cf, key), fill_cache=fill_cache)
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def iterator(self, start: bytes, column_family: 'rocksdb.ColumnFamilyHandle' = None,
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iterate_lower_bound: bytes = None, iterate_upper_bound: bytes = None,
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reverse: bool = False, include_key: bool = True, include_value: bool = True,
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fill_cache: bool = True, prefix_same_as_start: bool = False, auto_prefix_mode: bool = True):
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return self._db.iterator(
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start=start, column_family=column_family, iterate_lower_bound=iterate_lower_bound,
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iterate_upper_bound=iterate_upper_bound, reverse=reverse, include_key=include_key,
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include_value=include_value, fill_cache=fill_cache, prefix_same_as_start=prefix_same_as_start,
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auto_prefix_mode=auto_prefix_mode
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)
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def close(self):
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self._db.close()
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def try_catch_up_with_primary(self):
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self._db.try_catch_up_with_primary()
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def stage_raw_put(self, key: bytes, value: bytes):
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self._op_stack.append_op(RevertablePut(key, value))
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def stage_raw_delete(self, key: bytes, value: bytes):
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self._op_stack.append_op(RevertableDelete(key, value))
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def estimate_num_keys(self, column_family: 'rocksdb.ColumnFamilyHandle' = None):
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return int(self._db.get_property(b'rocksdb.estimate-num-keys', column_family).decode())
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