forked from LBRYCommunity/lbry-sdk
670 lines
26 KiB
Python
670 lines
26 KiB
Python
# Copyright (c) 2016, 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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"""Interface to the blockchain database."""
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import asyncio
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import array
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import ast
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import os
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import time
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from asyncio import sleep
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from bisect import bisect_right
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from collections import namedtuple
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from glob import glob
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from struct import pack, unpack
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import attr
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from torba.server import util
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from torba.server.hash import hash_to_hex_str, HASHX_LEN
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from torba.server.merkle import Merkle, MerkleCache
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from torba.server.util import formatted_time
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from torba.server.storage import db_class
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from torba.server.history import History
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UTXO = namedtuple("UTXO", "tx_num tx_pos tx_hash height value")
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@attr.s(slots=True)
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class FlushData:
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height = attr.ib()
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tx_count = attr.ib()
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headers = attr.ib()
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block_tx_hashes = attr.ib()
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# The following are flushed to the UTXO DB if undo_infos is not None
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undo_infos = attr.ib()
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adds = attr.ib()
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deletes = attr.ib()
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tip = attr.ib()
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class DB:
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"""Simple wrapper of the backend database for querying.
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Performs no DB update, though the DB will be cleaned on opening if
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it was shutdown uncleanly.
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"""
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DB_VERSIONS = [6]
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class DBError(Exception):
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"""Raised on general DB errors generally indicating corruption."""
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def __init__(self, env):
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self.logger = util.class_logger(__name__, self.__class__.__name__)
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self.env = env
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self.coin = env.coin
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# Setup block header size handlers
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if self.coin.STATIC_BLOCK_HEADERS:
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self.header_offset = self.coin.static_header_offset
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self.header_len = self.coin.static_header_len
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else:
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self.header_offset = self.dynamic_header_offset
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self.header_len = self.dynamic_header_len
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self.logger.info(f'switching current directory to {env.db_dir}')
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os.chdir(env.db_dir)
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self.db_class = db_class(self.env.db_engine)
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self.history = History()
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self.utxo_db = None
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self.tx_counts = None
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self.last_flush = time.time()
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self.logger.info(f'using {self.env.db_engine} for DB backend')
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# Header merkle cache
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self.merkle = Merkle()
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self.header_mc = MerkleCache(self.merkle, self.fs_block_hashes)
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self.headers_file = util.LogicalFile('meta/headers', 2, 16000000)
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self.tx_counts_file = util.LogicalFile('meta/txcounts', 2, 2000000)
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self.hashes_file = util.LogicalFile('meta/hashes', 4, 16000000)
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if not self.coin.STATIC_BLOCK_HEADERS:
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self.headers_offsets_file = util.LogicalFile(
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'meta/headers_offsets', 2, 16000000)
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async def _read_tx_counts(self):
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if self.tx_counts is not None:
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return
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# tx_counts[N] has the cumulative number of txs at the end of
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# height N. So tx_counts[0] is 1 - the genesis coinbase
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size = (self.db_height + 1) * 4
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tx_counts = self.tx_counts_file.read(0, size)
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assert len(tx_counts) == size
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self.tx_counts = array.array('I', tx_counts)
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if self.tx_counts:
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assert self.db_tx_count == self.tx_counts[-1]
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else:
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assert self.db_tx_count == 0
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async def _open_dbs(self, for_sync, compacting):
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assert self.utxo_db is None
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# First UTXO DB
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self.utxo_db = self.db_class('utxo', for_sync)
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if self.utxo_db.is_new:
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self.logger.info('created new database')
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self.logger.info('creating metadata directory')
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os.mkdir('meta')
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with util.open_file('COIN', create=True) as f:
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f.write(f'ElectrumX databases and metadata for '
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f'{self.coin.NAME} {self.coin.NET}'.encode())
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if not self.coin.STATIC_BLOCK_HEADERS:
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self.headers_offsets_file.write(0, bytes(8))
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else:
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self.logger.info(f'opened UTXO DB (for sync: {for_sync})')
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self.read_utxo_state()
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# Then history DB
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self.utxo_flush_count = self.history.open_db(self.db_class, for_sync,
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self.utxo_flush_count,
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compacting)
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self.clear_excess_undo_info()
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# Read TX counts (requires meta directory)
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await self._read_tx_counts()
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def close(self):
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self.utxo_db.close()
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self.history.close_db()
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async def open_for_compacting(self):
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await self._open_dbs(True, True)
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async def open_for_sync(self):
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"""Open the databases to sync to the daemon.
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When syncing we want to reserve a lot of open files for the
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synchronization. When serving clients we want the open files for
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serving network connections.
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"""
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await self._open_dbs(True, False)
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async def open_for_serving(self):
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"""Open the databases for serving. If they are already open they are
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closed first.
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"""
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if self.utxo_db:
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self.logger.info('closing DBs to re-open for serving')
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self.utxo_db.close()
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self.history.close_db()
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self.utxo_db = None
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await self._open_dbs(False, False)
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# Header merkle cache
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async def populate_header_merkle_cache(self):
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self.logger.info('populating header merkle cache...')
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length = max(1, self.db_height - self.env.reorg_limit)
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start = time.time()
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await self.header_mc.initialize(length)
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elapsed = time.time() - start
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self.logger.info(f'header merkle cache populated in {elapsed:.1f}s')
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async def header_branch_and_root(self, length, height):
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return await self.header_mc.branch_and_root(length, height)
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# Flushing
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def assert_flushed(self, flush_data):
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"""Asserts state is fully flushed."""
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assert flush_data.tx_count == self.fs_tx_count == self.db_tx_count
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assert flush_data.height == self.fs_height == self.db_height
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assert flush_data.tip == self.db_tip
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assert not flush_data.headers
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assert not flush_data.block_tx_hashes
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assert not flush_data.adds
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assert not flush_data.deletes
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assert not flush_data.undo_infos
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self.history.assert_flushed()
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def flush_dbs(self, flush_data, flush_utxos, estimate_txs_remaining):
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"""Flush out cached state. History is always flushed; UTXOs are
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flushed if flush_utxos."""
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if flush_data.height == self.db_height:
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self.assert_flushed(flush_data)
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return
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start_time = time.time()
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prior_flush = self.last_flush
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tx_delta = flush_data.tx_count - self.last_flush_tx_count
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# Flush to file system
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self.flush_fs(flush_data)
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# Then history
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self.flush_history()
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# Flush state last as it reads the wall time.
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with self.utxo_db.write_batch() as batch:
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if flush_utxos:
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self.flush_utxo_db(batch, flush_data)
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self.flush_state(batch)
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# Update and put the wall time again - otherwise we drop the
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# time it took to commit the batch
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self.flush_state(self.utxo_db)
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elapsed = self.last_flush - start_time
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self.logger.info(f'flush #{self.history.flush_count:,d} took '
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f'{elapsed:.1f}s. Height {flush_data.height:,d} '
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f'txs: {flush_data.tx_count:,d} ({tx_delta:+,d})')
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# Catch-up stats
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if self.utxo_db.for_sync:
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flush_interval = self.last_flush - prior_flush
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tx_per_sec_gen = int(flush_data.tx_count / self.wall_time)
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tx_per_sec_last = 1 + int(tx_delta / flush_interval)
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eta = estimate_txs_remaining() / tx_per_sec_last
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self.logger.info(f'tx/sec since genesis: {tx_per_sec_gen:,d}, '
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f'since last flush: {tx_per_sec_last:,d}')
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self.logger.info(f'sync time: {formatted_time(self.wall_time)} '
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f'ETA: {formatted_time(eta)}')
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def flush_fs(self, flush_data):
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"""Write headers, tx counts and block tx hashes to the filesystem.
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The first height to write is self.fs_height + 1. The FS
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metadata is all append-only, so in a crash we just pick up
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again from the height stored in the DB.
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"""
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prior_tx_count = (self.tx_counts[self.fs_height]
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if self.fs_height >= 0 else 0)
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assert len(flush_data.block_tx_hashes) == len(flush_data.headers)
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assert flush_data.height == self.fs_height + len(flush_data.headers)
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assert flush_data.tx_count == (self.tx_counts[-1] if self.tx_counts
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else 0)
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assert len(self.tx_counts) == flush_data.height + 1
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hashes = b''.join(flush_data.block_tx_hashes)
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flush_data.block_tx_hashes.clear()
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assert len(hashes) % 32 == 0
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assert len(hashes) // 32 == flush_data.tx_count - prior_tx_count
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# Write the headers, tx counts, and tx hashes
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start_time = time.time()
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height_start = self.fs_height + 1
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offset = self.header_offset(height_start)
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self.headers_file.write(offset, b''.join(flush_data.headers))
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self.fs_update_header_offsets(offset, height_start, flush_data.headers)
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flush_data.headers.clear()
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offset = height_start * self.tx_counts.itemsize
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self.tx_counts_file.write(offset,
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self.tx_counts[height_start:].tobytes())
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offset = prior_tx_count * 32
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self.hashes_file.write(offset, hashes)
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self.fs_height = flush_data.height
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self.fs_tx_count = flush_data.tx_count
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if self.utxo_db.for_sync:
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elapsed = time.time() - start_time
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self.logger.info(f'flushed filesystem data in {elapsed:.2f}s')
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def flush_history(self):
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self.history.flush()
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def flush_utxo_db(self, batch, flush_data):
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"""Flush the cached DB writes and UTXO set to the batch."""
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# Care is needed because the writes generated by flushing the
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# UTXO state may have keys in common with our write cache or
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# may be in the DB already.
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start_time = time.time()
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add_count = len(flush_data.adds)
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spend_count = len(flush_data.deletes) // 2
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# Spends
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batch_delete = batch.delete
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for key in sorted(flush_data.deletes):
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batch_delete(key)
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flush_data.deletes.clear()
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# New UTXOs
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batch_put = batch.put
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for key, value in flush_data.adds.items():
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# suffix = tx_idx + tx_num
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hashX = value[:-12]
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suffix = key[-2:] + value[-12:-8]
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batch_put(b'h' + key[:4] + suffix, hashX)
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batch_put(b'u' + hashX + suffix, value[-8:])
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flush_data.adds.clear()
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# New undo information
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self.flush_undo_infos(batch_put, flush_data.undo_infos)
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flush_data.undo_infos.clear()
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if self.utxo_db.for_sync:
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block_count = flush_data.height - self.db_height
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tx_count = flush_data.tx_count - self.db_tx_count
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elapsed = time.time() - start_time
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self.logger.info(f'flushed {block_count:,d} blocks with '
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f'{tx_count:,d} txs, {add_count:,d} UTXO adds, '
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f'{spend_count:,d} spends in '
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f'{elapsed:.1f}s, committing...')
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self.utxo_flush_count = self.history.flush_count
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self.db_height = flush_data.height
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self.db_tx_count = flush_data.tx_count
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self.db_tip = flush_data.tip
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def flush_state(self, batch):
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"""Flush chain state to the batch."""
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now = time.time()
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self.wall_time += now - self.last_flush
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self.last_flush = now
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self.last_flush_tx_count = self.fs_tx_count
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self.write_utxo_state(batch)
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def flush_backup(self, flush_data, touched):
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"""Like flush_dbs() but when backing up. All UTXOs are flushed."""
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assert not flush_data.headers
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assert not flush_data.block_tx_hashes
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assert flush_data.height < self.db_height
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self.history.assert_flushed()
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start_time = time.time()
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tx_delta = flush_data.tx_count - self.last_flush_tx_count
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self.backup_fs(flush_data.height, flush_data.tx_count)
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self.history.backup(touched, flush_data.tx_count)
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with self.utxo_db.write_batch() as batch:
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self.flush_utxo_db(batch, flush_data)
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# Flush state last as it reads the wall time.
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self.flush_state(batch)
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elapsed = self.last_flush - start_time
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self.logger.info(f'backup flush #{self.history.flush_count:,d} took '
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f'{elapsed:.1f}s. Height {flush_data.height:,d} '
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f'txs: {flush_data.tx_count:,d} ({tx_delta:+,d})')
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def fs_update_header_offsets(self, offset_start, height_start, headers):
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if self.coin.STATIC_BLOCK_HEADERS:
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return
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offset = offset_start
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offsets = []
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for h in headers:
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offset += len(h)
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offsets.append(pack("<Q", offset))
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# For each header we get the offset of the next header, hence we
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# start writing from the next height
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pos = (height_start + 1) * 8
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self.headers_offsets_file.write(pos, b''.join(offsets))
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def dynamic_header_offset(self, height):
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assert not self.coin.STATIC_BLOCK_HEADERS
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offset, = unpack('<Q', self.headers_offsets_file.read(height * 8, 8))
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return offset
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def dynamic_header_len(self, height):
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return self.dynamic_header_offset(height + 1)\
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- self.dynamic_header_offset(height)
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def backup_fs(self, height, tx_count):
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"""Back up during a reorg. This just updates our pointers."""
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self.fs_height = height
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self.fs_tx_count = tx_count
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# Truncate header_mc: header count is 1 more than the height.
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self.header_mc.truncate(height + 1)
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async def raw_header(self, height):
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"""Return the binary header at the given height."""
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header, n = await self.read_headers(height, 1)
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if n != 1:
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raise IndexError(f'height {height:,d} out of range')
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return header
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async def read_headers(self, start_height, count):
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"""Requires start_height >= 0, count >= 0. Reads as many headers as
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are available starting at start_height up to count. This
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would be zero if start_height is beyond self.db_height, for
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example.
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Returns a (binary, n) pair where binary is the concatenated
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binary headers, and n is the count of headers returned.
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"""
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if start_height < 0 or count < 0:
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raise self.DBError(f'{count:,d} headers starting at '
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f'{start_height:,d} not on disk')
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def read_headers():
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# Read some from disk
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disk_count = max(0, min(count, self.db_height + 1 - start_height))
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if disk_count:
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offset = self.header_offset(start_height)
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size = self.header_offset(start_height + disk_count) - offset
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return self.headers_file.read(offset, size), disk_count
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return b'', 0
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return await asyncio.get_event_loop().run_in_executor(None, read_headers)
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def fs_tx_hash(self, tx_num):
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"""Return a par (tx_hash, tx_height) for the given tx number.
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If the tx_height is not on disk, returns (None, tx_height)."""
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tx_height = bisect_right(self.tx_counts, tx_num)
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if tx_height > self.db_height:
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tx_hash = None
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else:
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tx_hash = self.hashes_file.read(tx_num * 32, 32)
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return tx_hash, tx_height
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async def fs_block_hashes(self, height, count):
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headers_concat, headers_count = await self.read_headers(height, count)
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if headers_count != count:
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raise self.DBError('only got {:,d} headers starting at {:,d}, not '
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'{:,d}'.format(headers_count, height, count))
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offset = 0
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headers = []
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for n in range(count):
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hlen = self.header_len(height + n)
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headers.append(headers_concat[offset:offset + hlen])
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offset += hlen
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return [self.coin.header_hash(header) for header in headers]
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async def limited_history(self, hashX, *, limit=1000):
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"""Return an unpruned, sorted list of (tx_hash, height) tuples of
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confirmed transactions that touched the address, earliest in
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the blockchain first. Includes both spending and receiving
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transactions. By default returns at most 1000 entries. Set
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limit to None to get them all.
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"""
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def read_history():
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tx_nums = list(self.history.get_txnums(hashX, limit))
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fs_tx_hash = self.fs_tx_hash
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return [fs_tx_hash(tx_num) for tx_num in tx_nums]
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while True:
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history = await asyncio.get_event_loop().run_in_executor(None, read_history)
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if all(hash is not None for hash, height in history):
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return history
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self.logger.warning(f'limited_history: tx hash '
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f'not found (reorg?), retrying...')
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await sleep(0.25)
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# -- Undo information
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def min_undo_height(self, max_height):
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"""Returns a height from which we should store undo info."""
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return max_height - self.env.reorg_limit + 1
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def undo_key(self, height):
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"""DB key for undo information at the given height."""
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return b'U' + pack('>I', height)
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def read_undo_info(self, height):
|
|
"""Read undo information from a file for the current height."""
|
|
return self.utxo_db.get(self.undo_key(height))
|
|
|
|
def flush_undo_infos(self, batch_put, undo_infos):
|
|
"""undo_infos is a list of (undo_info, height) pairs."""
|
|
for undo_info, height in undo_infos:
|
|
batch_put(self.undo_key(height), b''.join(undo_info))
|
|
|
|
def raw_block_prefix(self):
|
|
return 'meta/block'
|
|
|
|
def raw_block_path(self, height):
|
|
return f'{self.raw_block_prefix()}{height:d}'
|
|
|
|
def read_raw_block(self, height):
|
|
"""Returns a raw block read from disk. Raises FileNotFoundError
|
|
if the block isn't on-disk."""
|
|
with util.open_file(self.raw_block_path(height)) as f:
|
|
return f.read(-1)
|
|
|
|
def write_raw_block(self, block, height):
|
|
"""Write a raw block to disk."""
|
|
with util.open_truncate(self.raw_block_path(height)) as f:
|
|
f.write(block)
|
|
# Delete old blocks to prevent them accumulating
|
|
try:
|
|
del_height = self.min_undo_height(height) - 1
|
|
os.remove(self.raw_block_path(del_height))
|
|
except FileNotFoundError:
|
|
pass
|
|
|
|
def clear_excess_undo_info(self):
|
|
"""Clear excess undo info. Only most recent N are kept."""
|
|
prefix = b'U'
|
|
min_height = self.min_undo_height(self.db_height)
|
|
keys = []
|
|
for key, hist in self.utxo_db.iterator(prefix=prefix):
|
|
height, = unpack('>I', key[-4:])
|
|
if height >= min_height:
|
|
break
|
|
keys.append(key)
|
|
|
|
if keys:
|
|
with self.utxo_db.write_batch() as batch:
|
|
for key in keys:
|
|
batch.delete(key)
|
|
self.logger.info(f'deleted {len(keys):,d} stale undo entries')
|
|
|
|
# delete old block files
|
|
prefix = self.raw_block_prefix()
|
|
paths = [path for path in glob(f'{prefix}[0-9]*')
|
|
if len(path) > len(prefix)
|
|
and int(path[len(prefix):]) < min_height]
|
|
if paths:
|
|
for path in paths:
|
|
try:
|
|
os.remove(path)
|
|
except FileNotFoundError:
|
|
pass
|
|
self.logger.info(f'deleted {len(paths):,d} stale block files')
|
|
|
|
# -- UTXO database
|
|
|
|
def read_utxo_state(self):
|
|
state = self.utxo_db.get(b'state')
|
|
if not state:
|
|
self.db_height = -1
|
|
self.db_tx_count = 0
|
|
self.db_tip = b'\0' * 32
|
|
self.db_version = max(self.DB_VERSIONS)
|
|
self.utxo_flush_count = 0
|
|
self.wall_time = 0
|
|
self.first_sync = True
|
|
else:
|
|
state = ast.literal_eval(state.decode())
|
|
if not isinstance(state, dict):
|
|
raise self.DBError('failed reading state from DB')
|
|
self.db_version = state['db_version']
|
|
if self.db_version not in self.DB_VERSIONS:
|
|
raise self.DBError('your UTXO DB version is {} but this '
|
|
'software only handles versions {}'
|
|
.format(self.db_version, self.DB_VERSIONS))
|
|
# backwards compat
|
|
genesis_hash = state['genesis']
|
|
if isinstance(genesis_hash, bytes):
|
|
genesis_hash = genesis_hash.decode()
|
|
if genesis_hash != self.coin.GENESIS_HASH:
|
|
raise self.DBError('DB genesis hash {} does not match coin {}'
|
|
.format(genesis_hash,
|
|
self.coin.GENESIS_HASH))
|
|
self.db_height = state['height']
|
|
self.db_tx_count = state['tx_count']
|
|
self.db_tip = state['tip']
|
|
self.utxo_flush_count = state['utxo_flush_count']
|
|
self.wall_time = state['wall_time']
|
|
self.first_sync = state['first_sync']
|
|
|
|
# These are our state as we move ahead of DB state
|
|
self.fs_height = self.db_height
|
|
self.fs_tx_count = self.db_tx_count
|
|
self.last_flush_tx_count = self.fs_tx_count
|
|
|
|
# Log some stats
|
|
self.logger.info('DB version: {:d}'.format(self.db_version))
|
|
self.logger.info('coin: {}'.format(self.coin.NAME))
|
|
self.logger.info('network: {}'.format(self.coin.NET))
|
|
self.logger.info('height: {:,d}'.format(self.db_height))
|
|
self.logger.info('tip: {}'.format(hash_to_hex_str(self.db_tip)))
|
|
self.logger.info('tx count: {:,d}'.format(self.db_tx_count))
|
|
if self.utxo_db.for_sync:
|
|
self.logger.info(f'flushing DB cache at {self.env.cache_MB:,d} MB')
|
|
if self.first_sync:
|
|
self.logger.info('sync time so far: {}'
|
|
.format(util.formatted_time(self.wall_time)))
|
|
|
|
def write_utxo_state(self, batch):
|
|
"""Write (UTXO) state to the batch."""
|
|
state = {
|
|
'genesis': self.coin.GENESIS_HASH,
|
|
'height': self.db_height,
|
|
'tx_count': self.db_tx_count,
|
|
'tip': self.db_tip,
|
|
'utxo_flush_count': self.utxo_flush_count,
|
|
'wall_time': self.wall_time,
|
|
'first_sync': self.first_sync,
|
|
'db_version': self.db_version,
|
|
}
|
|
batch.put(b'state', repr(state).encode())
|
|
|
|
def set_flush_count(self, count):
|
|
self.utxo_flush_count = count
|
|
with self.utxo_db.write_batch() as batch:
|
|
self.write_utxo_state(batch)
|
|
|
|
async def all_utxos(self, hashX):
|
|
"""Return all UTXOs for an address sorted in no particular order."""
|
|
def read_utxos():
|
|
utxos = []
|
|
utxos_append = utxos.append
|
|
s_unpack = unpack
|
|
# Key: b'u' + address_hashX + tx_idx + tx_num
|
|
# Value: the UTXO value as a 64-bit unsigned integer
|
|
prefix = b'u' + hashX
|
|
for db_key, db_value in self.utxo_db.iterator(prefix=prefix):
|
|
tx_pos, tx_num = s_unpack('<HI', db_key[-6:])
|
|
value, = unpack('<Q', db_value)
|
|
tx_hash, height = self.fs_tx_hash(tx_num)
|
|
utxos_append(UTXO(tx_num, tx_pos, tx_hash, height, value))
|
|
return utxos
|
|
|
|
while True:
|
|
utxos = await asyncio.get_event_loop().run_in_executor(None, read_utxos)
|
|
if all(utxo.tx_hash is not None for utxo in utxos):
|
|
return utxos
|
|
self.logger.warning(f'all_utxos: tx hash not '
|
|
f'found (reorg?), retrying...')
|
|
await sleep(0.25)
|
|
|
|
async def lookup_utxos(self, prevouts):
|
|
"""For each prevout, lookup it up in the DB and return a (hashX,
|
|
value) pair or None if not found.
|
|
|
|
Used by the mempool code.
|
|
"""
|
|
def lookup_hashXs():
|
|
"""Return (hashX, suffix) pairs, or None if not found,
|
|
for each prevout.
|
|
"""
|
|
def lookup_hashX(tx_hash, tx_idx):
|
|
idx_packed = pack('<H', tx_idx)
|
|
|
|
# Key: b'h' + compressed_tx_hash + tx_idx + tx_num
|
|
# Value: hashX
|
|
prefix = b'h' + tx_hash[:4] + idx_packed
|
|
|
|
# Find which entry, if any, the TX_HASH matches.
|
|
for db_key, hashX in self.utxo_db.iterator(prefix=prefix):
|
|
tx_num_packed = db_key[-4:]
|
|
tx_num, = unpack('<I', tx_num_packed)
|
|
hash, height = self.fs_tx_hash(tx_num)
|
|
if hash == tx_hash:
|
|
return hashX, idx_packed + tx_num_packed
|
|
return None, None
|
|
return [lookup_hashX(*prevout) for prevout in prevouts]
|
|
|
|
def lookup_utxos(hashX_pairs):
|
|
def lookup_utxo(hashX, suffix):
|
|
if not hashX:
|
|
# This can happen when the daemon is a block ahead
|
|
# of us and has mempool txs spending outputs from
|
|
# that new block
|
|
return None
|
|
# Key: b'u' + address_hashX + tx_idx + tx_num
|
|
# Value: the UTXO value as a 64-bit unsigned integer
|
|
key = b'u' + hashX + suffix
|
|
db_value = self.utxo_db.get(key)
|
|
if not db_value:
|
|
# This can happen if the DB was updated between
|
|
# getting the hashXs and getting the UTXOs
|
|
return None
|
|
value, = unpack('<Q', db_value)
|
|
return hashX, value
|
|
return [lookup_utxo(*hashX_pair) for hashX_pair in hashX_pairs]
|
|
|
|
hashX_pairs = await asyncio.get_event_loop().run_in_executor(None, lookup_hashXs)
|
|
return await asyncio.get_event_loop().run_in_executor(None, lookup_utxos, hashX_pairs)
|