forked from LBRYCommunity/lbry-sdk
324 lines
12 KiB
Python
324 lines
12 KiB
Python
# Copyright (c) 2016-2018, Neil Booth
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# Copyright (c) 2017, the ElectrumX authors
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#
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# All rights reserved.
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#
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# See the file "LICENCE" for information about the copyright
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# and warranty status of this software.
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"""History by script hash (address)."""
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import array
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import ast
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import bisect
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import time
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from collections import defaultdict
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from functools import partial
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from lbry.wallet.server import util
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from lbry.wallet.server.util import pack_be_uint16, unpack_be_uint16_from
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from lbry.wallet.server.hash import hash_to_hex_str, HASHX_LEN
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class History:
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DB_VERSIONS = [0]
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def __init__(self):
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self.logger = util.class_logger(__name__, self.__class__.__name__)
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# For history compaction
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self.max_hist_row_entries = 12500
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self.unflushed = defaultdict(partial(array.array, 'I'))
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self.unflushed_count = 0
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self.db = None
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def open_db(self, db_class, for_sync, utxo_flush_count, compacting):
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self.db = db_class('hist', for_sync)
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self.read_state()
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self.clear_excess(utxo_flush_count)
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# An incomplete compaction needs to be cancelled otherwise
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# restarting it will corrupt the history
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if not compacting:
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self._cancel_compaction()
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return self.flush_count
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def close_db(self):
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if self.db:
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self.db.close()
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self.db = None
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def read_state(self):
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state = self.db.get(b'state\0\0')
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if state:
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state = ast.literal_eval(state.decode())
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if not isinstance(state, dict):
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raise RuntimeError('failed reading state from history DB')
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self.flush_count = state['flush_count']
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self.comp_flush_count = state.get('comp_flush_count', -1)
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self.comp_cursor = state.get('comp_cursor', -1)
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self.db_version = state.get('db_version', 0)
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else:
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self.flush_count = 0
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self.comp_flush_count = -1
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self.comp_cursor = -1
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self.db_version = max(self.DB_VERSIONS)
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self.logger.info(f'history DB version: {self.db_version}')
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if self.db_version not in self.DB_VERSIONS:
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msg = f'this software only handles DB versions {self.DB_VERSIONS}'
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self.logger.error(msg)
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raise RuntimeError(msg)
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self.logger.info(f'flush count: {self.flush_count:,d}')
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def clear_excess(self, utxo_flush_count):
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# < might happen at end of compaction as both DBs cannot be
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# updated atomically
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if self.flush_count <= utxo_flush_count:
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return
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self.logger.info('DB shut down uncleanly. Scanning for '
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'excess history flushes...')
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keys = []
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for key, hist in self.db.iterator(prefix=b''):
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flush_id, = unpack_be_uint16_from(key[-2:])
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if flush_id > utxo_flush_count:
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keys.append(key)
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self.logger.info(f'deleting {len(keys):,d} history entries')
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self.flush_count = utxo_flush_count
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with self.db.write_batch() as batch:
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for key in keys:
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batch.delete(key)
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self.write_state(batch)
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self.logger.info('deleted excess history entries')
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def write_state(self, batch):
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"""Write state to the history DB."""
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state = {
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'flush_count': self.flush_count,
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'comp_flush_count': self.comp_flush_count,
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'comp_cursor': self.comp_cursor,
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'db_version': self.db_version,
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}
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# History entries are not prefixed; the suffix \0\0 ensures we
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# look similar to other entries and aren't interfered with
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batch.put(b'state\0\0', repr(state).encode())
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def add_unflushed(self, hashXs_by_tx, first_tx_num):
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unflushed = self.unflushed
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count = 0
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for tx_num, hashXs in enumerate(hashXs_by_tx, start=first_tx_num):
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hashXs = set(hashXs)
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for hashX in hashXs:
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unflushed[hashX].append(tx_num)
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count += len(hashXs)
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self.unflushed_count += count
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def unflushed_memsize(self):
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return len(self.unflushed) * 180 + self.unflushed_count * 4
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def assert_flushed(self):
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assert not self.unflushed
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def flush(self):
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start_time = time.time()
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self.flush_count += 1
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flush_id = pack_be_uint16(self.flush_count)
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unflushed = self.unflushed
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with self.db.write_batch() as batch:
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for hashX in sorted(unflushed):
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key = hashX + flush_id
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batch.put(key, unflushed[hashX].tobytes())
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self.write_state(batch)
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count = len(unflushed)
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unflushed.clear()
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self.unflushed_count = 0
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if self.db.for_sync:
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elapsed = time.time() - start_time
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self.logger.info(f'flushed history in {elapsed:.1f}s '
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f'for {count:,d} addrs')
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def backup(self, hashXs, tx_count):
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# Not certain this is needed, but it doesn't hurt
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self.flush_count += 1
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nremoves = 0
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bisect_left = bisect.bisect_left
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with self.db.write_batch() as batch:
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for hashX in sorted(hashXs):
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deletes = []
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puts = {}
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for key, hist in self.db.iterator(prefix=hashX, reverse=True):
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a = array.array('I')
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a.frombytes(hist)
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# Remove all history entries >= tx_count
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idx = bisect_left(a, tx_count)
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nremoves += len(a) - idx
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if idx > 0:
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puts[key] = a[:idx].tobytes()
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break
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deletes.append(key)
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for key in deletes:
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batch.delete(key)
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for key, value in puts.items():
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batch.put(key, value)
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self.write_state(batch)
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self.logger.info(f'backing up removed {nremoves:,d} history entries')
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# def get_txnums(self, hashX, limit=1000):
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# """Generator that returns an unpruned, sorted list of tx_nums in the
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# history of a hashX. Includes both spending and receiving
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# transactions. By default yields at most 1000 entries. Set
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# limit to None to get them all. """
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# limit = util.resolve_limit(limit)
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# for key, hist in self.db.iterator(prefix=hashX):
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# a = array.array('I')
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# a.frombytes(hist)
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# for tx_num in a:
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# if limit == 0:
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# return
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# yield tx_num
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# limit -= 1
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#
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# History compaction
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#
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# comp_cursor is a cursor into compaction progress.
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# -1: no compaction in progress
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# 0-65535: Compaction in progress; all prefixes < comp_cursor have
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# been compacted, and later ones have not.
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# 65536: compaction complete in-memory but not flushed
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#
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# comp_flush_count applies during compaction, and is a flush count
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# for history with prefix < comp_cursor. flush_count applies
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# to still uncompacted history. It is -1 when no compaction is
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# taking place. Key suffixes up to and including comp_flush_count
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# are used, so a parallel history flush must first increment this
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#
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# When compaction is complete and the final flush takes place,
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# flush_count is reset to comp_flush_count, and comp_flush_count to -1
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def _flush_compaction(self, cursor, write_items, keys_to_delete):
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"""Flush a single compaction pass as a batch."""
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# Update compaction state
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if cursor == 65536:
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self.flush_count = self.comp_flush_count
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self.comp_cursor = -1
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self.comp_flush_count = -1
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else:
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self.comp_cursor = cursor
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# History DB. Flush compacted history and updated state
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with self.db.write_batch() as batch:
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# Important: delete first! The keyspace may overlap.
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for key in keys_to_delete:
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batch.delete(key)
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for key, value in write_items:
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batch.put(key, value)
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self.write_state(batch)
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def _compact_hashX(self, hashX, hist_map, hist_list,
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write_items, keys_to_delete):
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"""Compress history for a hashX. hist_list is an ordered list of
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the histories to be compressed."""
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# History entries (tx numbers) are 4 bytes each. Distribute
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# over rows of up to 50KB in size. A fixed row size means
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# future compactions will not need to update the first N - 1
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# rows.
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max_row_size = self.max_hist_row_entries * 4
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full_hist = b''.join(hist_list)
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nrows = (len(full_hist) + max_row_size - 1) // max_row_size
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if nrows > 4:
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self.logger.info('hashX {} is large: {:,d} entries across '
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'{:,d} rows'
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.format(hash_to_hex_str(hashX),
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len(full_hist) // 4, nrows))
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# Find what history needs to be written, and what keys need to
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# be deleted. Start by assuming all keys are to be deleted,
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# and then remove those that are the same on-disk as when
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# compacted.
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write_size = 0
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keys_to_delete.update(hist_map)
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for n, chunk in enumerate(util.chunks(full_hist, max_row_size)):
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key = hashX + pack_be_uint16(n)
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if hist_map.get(key) == chunk:
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keys_to_delete.remove(key)
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else:
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write_items.append((key, chunk))
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write_size += len(chunk)
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assert n + 1 == nrows
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self.comp_flush_count = max(self.comp_flush_count, n)
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return write_size
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def _compact_prefix(self, prefix, write_items, keys_to_delete):
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"""Compact all history entries for hashXs beginning with the
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given prefix. Update keys_to_delete and write."""
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prior_hashX = None
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hist_map = {}
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hist_list = []
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key_len = HASHX_LEN + 2
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write_size = 0
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for key, hist in self.db.iterator(prefix=prefix):
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# Ignore non-history entries
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if len(key) != key_len:
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continue
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hashX = key[:-2]
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if hashX != prior_hashX and prior_hashX:
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write_size += self._compact_hashX(prior_hashX, hist_map,
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hist_list, write_items,
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keys_to_delete)
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hist_map.clear()
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hist_list.clear()
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prior_hashX = hashX
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hist_map[key] = hist
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hist_list.append(hist)
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if prior_hashX:
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write_size += self._compact_hashX(prior_hashX, hist_map, hist_list,
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write_items, keys_to_delete)
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return write_size
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def _compact_history(self, limit):
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"""Inner loop of history compaction. Loops until limit bytes have
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been processed.
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"""
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keys_to_delete = set()
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write_items = [] # A list of (key, value) pairs
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write_size = 0
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# Loop over 2-byte prefixes
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cursor = self.comp_cursor
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while write_size < limit and cursor < 65536:
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prefix = pack_be_uint16(cursor)
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write_size += self._compact_prefix(prefix, write_items,
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keys_to_delete)
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cursor += 1
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max_rows = self.comp_flush_count + 1
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self._flush_compaction(cursor, write_items, keys_to_delete)
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self.logger.info('history compaction: wrote {:,d} rows ({:.1f} MB), '
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'removed {:,d} rows, largest: {:,d}, {:.1f}% complete'
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.format(len(write_items), write_size / 1000000,
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len(keys_to_delete), max_rows,
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100 * cursor / 65536))
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return write_size
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def _cancel_compaction(self):
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if self.comp_cursor != -1:
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self.logger.warning('cancelling in-progress history compaction')
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self.comp_flush_count = -1
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self.comp_cursor = -1
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