430 lines
18 KiB
Python
430 lines
18 KiB
Python
import asyncio
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import logging
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from io import StringIO
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from functools import partial
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from operator import itemgetter
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from collections import defaultdict
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from binascii import hexlify, unhexlify
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from typing import List, Optional, DefaultDict, NamedTuple
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from lbry.crypto.hash import double_sha256, sha256
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from lbry.service.api import Client
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from lbry.tasks import TaskGroup
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from lbry.blockchain.transaction import Transaction
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from lbry.blockchain.ledger import Ledger
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from lbry.blockchain.block import get_block_filter
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from lbry.db import Database
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from lbry.event import EventController
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from lbry.service.base import Service, Sync
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from .account import Account, AddressManager
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class TransactionEvent(NamedTuple):
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address: str
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tx: Transaction
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class AddressesGeneratedEvent(NamedTuple):
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address_manager: AddressManager
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addresses: List[str]
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class TransactionCacheItem:
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__slots__ = '_tx', 'lock', 'has_tx', 'pending_verifications'
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def __init__(self, tx: Optional[Transaction] = None, lock: Optional[asyncio.Lock] = None):
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self.has_tx = asyncio.Event()
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self.lock = lock or asyncio.Lock()
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self._tx = self.tx = tx
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self.pending_verifications = 0
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@property
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def tx(self) -> Optional[Transaction]:
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return self._tx
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@tx.setter
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def tx(self, tx: Transaction):
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self._tx = tx
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if tx is not None:
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self.has_tx.set()
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class SPVSync(Sync):
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def __init__(self, service: Service):
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super().__init__(service)
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return
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self.headers = headers
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self.network: Network = self.config.get('network') or Network(self)
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self.network.on_header.listen(self.receive_header)
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self.network.on_status.listen(self.process_status_update)
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self.network.on_connected.listen(self.join_network)
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self.accounts = []
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self.on_address = self.ledger.on_address
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self._on_header_controller = EventController()
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self.on_header = self._on_header_controller.stream
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self.on_header.listen(
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lambda change: log.info(
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'%s: added %s header blocks, final height %s',
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self.ledger.get_id(), change, self.headers.height
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)
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)
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self._download_height = 0
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self._on_ready_controller = EventController()
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self.on_ready = self._on_ready_controller.stream
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#self._tx_cache = pylru.lrucache(100000)
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self._update_tasks = TaskGroup()
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self._other_tasks = TaskGroup() # that we dont need to start
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self._header_processing_lock = asyncio.Lock()
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self._address_update_locks: DefaultDict[str, asyncio.Lock] = defaultdict(asyncio.Lock)
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self._known_addresses_out_of_sync = set()
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async def advance(self):
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address_array = [
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bytearray(a['address'].encode())
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for a in await self.service.db.get_all_addresses()
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]
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block_filters = await self.service.get_block_address_filters()
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for block_hash, block_filter in block_filters.items():
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bf = get_block_filter(block_filter)
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if bf.MatchAny(address_array):
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print(f'match: {block_hash} - {block_filter}')
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tx_filters = await self.service.get_transaction_address_filters(block_hash=block_hash)
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for txid, tx_filter in tx_filters.items():
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tf = get_block_filter(tx_filter)
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if tf.MatchAny(address_array):
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print(f' match: {txid} - {tx_filter}')
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txs = await self.service.search_transactions([txid])
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tx = Transaction(unhexlify(txs[txid]))
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await self.service.db.insert_transaction(tx)
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async def get_local_status_and_history(self, address, history=None):
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if not history:
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address_details = await self.db.get_address(address=address)
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history = (address_details['history'] if address_details else '') or ''
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parts = history.split(':')[:-1]
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return (
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hexlify(sha256(history.encode())).decode() if history else None,
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list(zip(parts[0::2], map(int, parts[1::2])))
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)
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@staticmethod
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def get_root_of_merkle_tree(branches, branch_positions, working_branch):
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for i, branch in enumerate(branches):
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other_branch = unhexlify(branch)[::-1]
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other_branch_on_left = bool((branch_positions >> i) & 1)
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if other_branch_on_left:
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combined = other_branch + working_branch
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else:
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combined = working_branch + other_branch
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working_branch = double_sha256(combined)
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return hexlify(working_branch[::-1])
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async def start(self):
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await self.headers.open()
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fully_synced = self.on_ready.first
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asyncio.create_task(self.network.start())
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await self.network.on_connected.first
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async with self._header_processing_lock:
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await self._update_tasks.add(self.initial_headers_sync())
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await fully_synced
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async def join_network(self, *_):
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log.info("Subscribing and updating accounts.")
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await self._update_tasks.add(self.subscribe_accounts())
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await self._update_tasks.done.wait()
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self._on_ready_controller.add(True)
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async def stop(self):
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self._update_tasks.cancel()
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self._other_tasks.cancel()
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await self._update_tasks.done.wait()
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await self._other_tasks.done.wait()
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await self.network.stop()
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await self.headers.close()
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@property
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def local_height_including_downloaded_height(self):
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return max(self.headers.height, self._download_height)
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async def initial_headers_sync(self):
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get_chunk = partial(self.network.retriable_call, self.network.get_headers, count=1000, b64=True)
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self.headers.chunk_getter = get_chunk
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async def doit():
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for height in reversed(sorted(self.headers.known_missing_checkpointed_chunks)):
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async with self._header_processing_lock:
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await self.headers.ensure_chunk_at(height)
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self._other_tasks.add(doit())
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await self.update_headers()
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async def update_headers(self, height=None, headers=None, subscription_update=False):
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rewound = 0
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while True:
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if height is None or height > len(self.headers):
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# sometimes header subscription updates are for a header in the future
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# which can't be connected, so we do a normal header sync instead
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height = len(self.headers)
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headers = None
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subscription_update = False
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if not headers:
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header_response = await self.network.retriable_call(self.network.get_headers, height, 2001)
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headers = header_response['hex']
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if not headers:
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# Nothing to do, network thinks we're already at the latest height.
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return
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added = await self.headers.connect(height, unhexlify(headers))
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if added > 0:
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height += added
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self._on_header_controller.add(
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BlockHeightEvent(self.headers.height, added))
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if rewound > 0:
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# we started rewinding blocks and apparently found
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# a new chain
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rewound = 0
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await self.db.rewind_blockchain(height)
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if subscription_update:
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# subscription updates are for latest header already
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# so we don't need to check if there are newer / more
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# on another loop of update_headers(), just return instead
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return
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elif added == 0:
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# we had headers to connect but none got connected, probably a reorganization
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height -= 1
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rewound += 1
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log.warning(
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"Blockchain Reorganization: attempting rewind to height %s from starting height %s",
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height, height+rewound
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)
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else:
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raise IndexError(f"headers.connect() returned negative number ({added})")
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if height < 0:
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raise IndexError(
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"Blockchain reorganization rewound all the way back to genesis hash. "
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"Something is very wrong. Maybe you are on the wrong blockchain?"
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)
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if rewound >= 100:
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raise IndexError(
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"Blockchain reorganization dropped {} headers. This is highly unusual. "
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"Will not continue to attempt reorganizing. Please, delete the ledger "
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"synchronization directory inside your wallet directory (folder: '{}') and "
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"restart the program to synchronize from scratch."
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.format(rewound, self.ledger.get_id())
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)
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headers = None # ready to download some more headers
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# if we made it this far and this was a subscription_update
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# it means something went wrong and now we're doing a more
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# robust sync, turn off subscription update shortcut
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subscription_update = False
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async def receive_header(self, response):
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async with self._header_processing_lock:
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header = response[0]
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await self.update_headers(
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height=header['height'], headers=header['hex'], subscription_update=True
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)
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async def subscribe_accounts(self):
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if self.network.is_connected and self.accounts:
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log.info("Subscribe to %i accounts", len(self.accounts))
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await asyncio.wait([
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self.subscribe_account(a) for a in self.accounts
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])
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async def subscribe_account(self, account: Account):
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for address_manager in account.address_managers.values():
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await self.subscribe_addresses(address_manager, await address_manager.get_addresses())
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await account.ensure_address_gap()
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async def unsubscribe_account(self, account: Account):
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for address in await account.get_addresses():
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await self.network.unsubscribe_address(address)
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async def subscribe_addresses(self, address_manager: AddressManager, addresses: List[str], batch_size: int = 1000):
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if self.network.is_connected and addresses:
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addresses_remaining = list(addresses)
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while addresses_remaining:
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batch = addresses_remaining[:batch_size]
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results = await self.network.subscribe_address(*batch)
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for address, remote_status in zip(batch, results):
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self._update_tasks.add(self.update_history(address, remote_status, address_manager))
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addresses_remaining = addresses_remaining[batch_size:]
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log.info("subscribed to %i/%i addresses on %s:%i", len(addresses) - len(addresses_remaining),
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len(addresses), *self.network.client.server_address_and_port)
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log.info(
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"finished subscribing to %i addresses on %s:%i", len(addresses),
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*self.network.client.server_address_and_port
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)
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def process_status_update(self, update):
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address, remote_status = update
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self._update_tasks.add(self.update_history(address, remote_status))
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async def update_history(self, address, remote_status, address_manager: AddressManager = None):
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async with self._address_update_locks[address]:
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self._known_addresses_out_of_sync.discard(address)
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local_status, local_history = await self.get_local_status_and_history(address)
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if local_status == remote_status:
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return True
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remote_history = await self.network.retriable_call(self.network.get_history, address)
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remote_history = list(map(itemgetter('tx_hash', 'height'), remote_history))
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we_need = set(remote_history) - set(local_history)
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if not we_need:
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return True
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cache_tasks: List[asyncio.Task[Transaction]] = []
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synced_history = StringIO()
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loop = asyncio.get_running_loop()
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for i, (txid, remote_height) in enumerate(remote_history):
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if i < len(local_history) and local_history[i] == (txid, remote_height) and not cache_tasks:
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synced_history.write(f'{txid}:{remote_height}:')
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else:
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check_local = (txid, remote_height) not in we_need
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cache_tasks.append(loop.create_task(
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self.cache_transaction(unhexlify(txid)[::-1], remote_height, check_local=check_local)
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))
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synced_txs = []
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for task in cache_tasks:
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tx = await task
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check_db_for_txos = []
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for txi in tx.inputs:
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if txi.txo_ref.txo is not None:
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continue
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cache_item = self._tx_cache.get(txi.txo_ref.tx_ref.hash)
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if cache_item is not None:
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if cache_item.tx is None:
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await cache_item.has_tx.wait()
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assert cache_item.tx is not None
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txi.txo_ref = cache_item.tx.outputs[txi.txo_ref.position].ref
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else:
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check_db_for_txos.append(txi.txo_ref.hash)
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referenced_txos = {} if not check_db_for_txos else {
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txo.id: txo for txo in await self.db.get_txos(
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txo_hash__in=check_db_for_txos, order_by='txo.txo_hash', no_tx=True
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)
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}
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for txi in tx.inputs:
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if txi.txo_ref.txo is not None:
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continue
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referenced_txo = referenced_txos.get(txi.txo_ref.id)
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if referenced_txo is not None:
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txi.txo_ref = referenced_txo.ref
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synced_history.write(f'{tx.id}:{tx.height}:')
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synced_txs.append(tx)
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await self.db.save_transaction_io_batch(
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synced_txs, address, self.ledger.address_to_hash160(address), synced_history.getvalue()
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)
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await asyncio.wait([
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self.ledger._on_transaction_controller.add(TransactionEvent(address, tx))
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for tx in synced_txs
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])
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if address_manager is None:
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address_manager = await self.get_address_manager_for_address(address)
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if address_manager is not None:
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await address_manager.ensure_address_gap()
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local_status, local_history = \
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await self.get_local_status_and_history(address, synced_history.getvalue())
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if local_status != remote_status:
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if local_history == remote_history:
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return True
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log.warning(
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"Wallet is out of sync after syncing. Remote: %s with %d items, local: %s with %d items",
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remote_status, len(remote_history), local_status, len(local_history)
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)
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log.warning("local: %s", local_history)
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log.warning("remote: %s", remote_history)
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self._known_addresses_out_of_sync.add(address)
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return False
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else:
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return True
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async def cache_transaction(self, tx_hash, remote_height, check_local=True):
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cache_item = self._tx_cache.get(tx_hash)
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if cache_item is None:
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cache_item = self._tx_cache[tx_hash] = TransactionCacheItem()
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elif cache_item.tx is not None and \
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cache_item.tx.height >= remote_height and \
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(cache_item.tx.is_verified or remote_height < 1):
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return cache_item.tx # cached tx is already up-to-date
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try:
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cache_item.pending_verifications += 1
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return await self._update_cache_item(cache_item, tx_hash, remote_height, check_local)
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finally:
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cache_item.pending_verifications -= 1
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async def _update_cache_item(self, cache_item, tx_hash, remote_height, check_local=True):
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async with cache_item.lock:
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tx = cache_item.tx
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if tx is None and check_local:
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# check local db
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tx = cache_item.tx = await self.db.get_transaction(tx_hash=tx_hash)
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merkle = None
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if tx is None:
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# fetch from network
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_raw, merkle = await self.network.retriable_call(
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self.network.get_transaction_and_merkle, tx_hash, remote_height
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)
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tx = Transaction(unhexlify(_raw), height=merkle.get('block_height'))
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cache_item.tx = tx # make sure it's saved before caching it
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await self.maybe_verify_transaction(tx, remote_height, merkle)
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return tx
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async def maybe_verify_transaction(self, tx, remote_height, merkle=None):
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tx.height = remote_height
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cached = self._tx_cache.get(tx.hash)
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if not cached:
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# cache txs looked up by transaction_show too
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cached = TransactionCacheItem()
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cached.tx = tx
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self._tx_cache[tx.hash] = cached
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if 0 < remote_height < len(self.headers) and cached.pending_verifications <= 1:
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# can't be tx.pending_verifications == 1 because we have to handle the transaction_show case
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if not merkle:
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merkle = await self.network.retriable_call(self.network.get_merkle, tx.hash, remote_height)
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merkle_root = self.get_root_of_merkle_tree(merkle['merkle'], merkle['pos'], tx.hash)
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header = await self.headers.get(remote_height)
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tx.position = merkle['pos']
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tx.is_verified = merkle_root == header['merkle_root']
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async def get_address_manager_for_address(self, address) -> Optional[AddressManager]:
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details = await self.db.get_address(address=address)
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for account in self.accounts:
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if account.id == details['account']:
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return account.address_managers[details['chain']]
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return None
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