forked from LBRYCommunity/lbry-sdk
469 lines
17 KiB
Python
469 lines
17 KiB
Python
import os
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import hashlib
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from binascii import hexlify, unhexlify
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from typing import List, Dict, Type
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from operator import itemgetter
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from twisted.internet import threads, defer, task, reactor
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from torba.account import Account, AccountsView
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from torba.basecoin import BaseCoin
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from torba.basetransaction import BaseTransaction
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from torba.basenetwork import BaseNetwork
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from torba.stream import StreamController, execute_serially
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from torba.util import hex_to_int, int_to_hex, rev_hex, hash_encode
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from torba.hash import double_sha256, pow_hash
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class Address:
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def __init__(self, pubkey_hash):
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self.pubkey_hash = pubkey_hash
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self.transactions = [] # type: List[BaseTransaction]
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def __iter__(self):
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return iter(self.transactions)
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def __len__(self):
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return len(self.transactions)
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def add_transaction(self, transaction):
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self.transactions.append(transaction)
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def get_unspent_utxos(self):
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inputs, outputs, utxos = [], [], []
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for tx in self:
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for txi in tx.inputs:
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inputs.append((txi.output_txid, txi.output_index))
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for txo in tx.outputs:
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if txo.script.is_pay_pubkey_hash and txo.script.values['pubkey_hash'] == self.pubkey_hash:
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outputs.append((txo, txo.transaction.hash, txo.index))
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for output in set(outputs):
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if output[1:] not in inputs:
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yield output[0]
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class BaseLedger:
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# coin_class is automatically set by BaseCoin metaclass
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# when it creates the Coin classes, there is a 1..1 relationship
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# between a coin and a ledger (at the class level) but a 1..* relationship
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# at instance level. Only one Ledger instance should exist per coin class,
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# but many coin instances can exist linking back to the single Ledger instance.
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coin_class = None # type: Type[BaseCoin]
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network_class = None # type: Type[BaseNetwork]
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verify_bits_to_target = True
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def __init__(self, accounts, config=None, network=None, db=None):
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self.accounts = accounts # type: AccountsView
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self.config = config or {}
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self.db = db
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self.addresses = {} # type: Dict[str, Address]
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self.transactions = {} # type: Dict[str, BaseTransaction]
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self.headers = Headers(self)
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self._on_transaction_controller = StreamController()
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self.on_transaction = self._on_transaction_controller.stream
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self.network = network or self.network_class(self.config)
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self.network.on_header.listen(self.process_header)
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self.network.on_status.listen(self.process_status)
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@property
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def transaction_class(self):
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return self.coin_class.transaction_class
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@classmethod
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def from_json(cls, json_dict):
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return cls(json_dict)
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@defer.inlineCallbacks
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def load(self):
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txs = yield self.db.get_transactions()
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for tx_hash, raw, height in txs:
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self.transactions[tx_hash] = self.transaction_class(raw, height)
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txios = yield self.db.get_transaction_inputs_and_outputs()
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for tx_hash, address_hash, input_output, amount, height in txios:
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tx = self.transactions[tx_hash]
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address = self.addresses.get(address_hash)
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if address is None:
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address = self.addresses[address_hash] = Address(self.coin_class.address_to_hash160(address_hash))
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tx.add_txio(address, input_output, amount)
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address.add_transaction(tx)
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def is_address_old(self, address, age_limit=2):
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age = -1
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for tx in self.get_transactions(address, []):
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if tx.height == 0:
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tx_age = 0
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else:
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tx_age = self.headers.height - tx.height + 1
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if tx_age > age:
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age = tx_age
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return age > age_limit
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def add_transaction(self, address, transaction): # type: (str, BaseTransaction) -> None
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if address not in self.addresses:
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self.addresses[address] = Address(self.coin_class.address_to_hash160(address))
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self.addresses[address].add_transaction(transaction)
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self.transactions.setdefault(hexlify(transaction.id), transaction)
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self._on_transaction_controller.add(transaction)
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def has_address(self, address):
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return address in self.addresses
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def get_transaction(self, tx_hash, *args):
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return self.transactions.get(tx_hash, *args)
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def get_transactions(self, address, *args):
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return self.addresses.get(address, *args)
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def get_status(self, address):
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hashes = [
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'{}:{}:'.format(hexlify(tx.hash), tx.height).encode()
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for tx in self.get_transactions(address, []) if tx.height is not None
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]
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if hashes:
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return hexlify(hashlib.sha256(b''.join(hashes)).digest())
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def has_transaction(self, tx_hash):
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return tx_hash in self.transactions
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def get_least_used_address(self, addresses, max_transactions=100):
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transaction_counts = []
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for address in addresses:
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transactions = self.get_transactions(address, [])
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tx_count = len(transactions)
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if tx_count == 0:
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return address
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elif tx_count >= max_transactions:
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continue
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else:
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transaction_counts.append((address, tx_count))
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if transaction_counts:
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transaction_counts.sort(key=itemgetter(1))
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return transaction_counts[0]
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def get_unspent_outputs(self, address):
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if address in self.addresses:
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return list(self.addresses[address].get_unspent_utxos())
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return []
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@defer.inlineCallbacks
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def start(self):
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first_connection = self.network.on_connected.first
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self.network.start()
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yield first_connection
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self.headers.touch()
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yield self.update_headers()
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yield self.network.subscribe_headers()
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yield self.update_accounts()
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def stop(self):
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return self.network.stop()
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@execute_serially
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@defer.inlineCallbacks
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def update_headers(self):
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while True:
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height_sought = len(self.headers)
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headers = yield self.network.get_headers(height_sought)
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print("received {} headers starting at {} height".format(headers['count'], height_sought))
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#log.info("received {} headers starting at {} height".format(headers['count'], height_sought))
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if headers['count'] <= 0:
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break
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yield self.headers.connect(height_sought, unhexlify(headers['hex']))
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@defer.inlineCallbacks
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def process_header(self, response):
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header = response[0]
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if self.update_headers.is_running:
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return
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if header['height'] == len(self.headers):
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# New header from network directly connects after the last local header.
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yield self.headers.connect(len(self.headers), unhexlify(header['hex']))
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elif header['height'] > len(self.headers):
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# New header is several heights ahead of local, do download instead.
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yield self.update_headers()
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@execute_serially
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def update_accounts(self):
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return defer.DeferredList([
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self.update_account(a) for a in self.accounts
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])
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@defer.inlineCallbacks
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def update_account(self, account): # type: (Account) -> defer.Defferred
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# Before subscribing, download history for any addresses that don't have any,
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# this avoids situation where we're getting status updates to addresses we know
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# need to update anyways. Continue to get history and create more addresses until
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# all missing addresses are created and history for them is fully restored.
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account.ensure_enough_addresses()
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addresses = list(account.addresses_without_history())
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while addresses:
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yield defer.DeferredList([
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self.update_history(a) for a in addresses
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])
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addresses = account.ensure_enough_addresses()
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# By this point all of the addresses should be restored and we
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# can now subscribe all of them to receive updates.
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yield defer.DeferredList([
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self.subscribe_history(address)
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for address in account.addresses
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])
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@defer.inlineCallbacks
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def update_history(self, address):
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history = yield self.network.get_history(address)
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for hash in map(itemgetter('tx_hash'), history):
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transaction = self.get_transaction(hash)
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if not transaction:
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raw = yield self.network.get_transaction(hash)
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transaction = self.transaction_class(unhexlify(raw))
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self.add_transaction(address, transaction)
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@defer.inlineCallbacks
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def subscribe_history(self, address):
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status = yield self.network.subscribe_address(address)
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if status != self.get_status(address):
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yield self.update_history(address)
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def process_status(self, response):
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address, status = response
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if status != self.get_status(address):
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task.deferLater(reactor, 0, self.update_history, address)
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def broadcast(self, tx):
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return self.network.broadcast(hexlify(tx.raw))
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class Headers:
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def __init__(self, ledger):
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self.ledger = ledger
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self._size = None
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self._on_change_controller = StreamController()
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self.on_changed = self._on_change_controller.stream
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@property
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def path(self):
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wallet_path = self.ledger.config.get('wallet_path', '')
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filename = '{}_headers'.format(self.ledger.coin_class.get_id())
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return os.path.join(wallet_path, filename)
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def touch(self):
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if not os.path.exists(self.path):
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with open(self.path, 'wb'):
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pass
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@property
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def height(self):
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return len(self) - 1
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def sync_read_length(self):
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return os.path.getsize(self.path) // self.ledger.header_size
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def sync_read_header(self, height):
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if 0 <= height < len(self):
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with open(self.path, 'rb') as f:
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f.seek(height * self.ledger.header_size)
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return f.read(self.ledger.header_size)
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def __len__(self):
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if self._size is None:
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self._size = self.sync_read_length()
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return self._size
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def __getitem__(self, height):
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assert not isinstance(height, slice),\
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"Slicing of header chain has not been implemented yet."
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header = self.sync_read_header(height)
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return self._deserialize(height, header)
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@execute_serially
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@defer.inlineCallbacks
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def connect(self, start, headers):
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yield threads.deferToThread(self._sync_connect, start, headers)
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def _sync_connect(self, start, headers):
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previous_header = None
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for header in self._iterate_headers(start, headers):
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height = header['block_height']
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if previous_header is None and height > 0:
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previous_header = self[height-1]
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self._verify_header(height, header, previous_header)
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previous_header = header
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with open(self.path, 'r+b') as f:
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f.seek(start * self.ledger.header_size)
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f.write(headers)
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f.truncate()
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_old_size = self._size
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self._size = self.sync_read_length()
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change = self._size - _old_size
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#log.info('saved {} header blocks'.format(change))
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self._on_change_controller.add(change)
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def _iterate_headers(self, height, headers):
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assert len(headers) % self.ledger.header_size == 0
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for idx in range(len(headers) // self.ledger.header_size):
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start, end = idx * self.ledger.header_size, (idx + 1) * self.ledger.header_size
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header = headers[start:end]
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yield self._deserialize(height+idx, header)
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def _verify_header(self, height, header, previous_header):
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previous_hash = self._hash_header(previous_header)
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assert previous_hash == header['prev_block_hash'], \
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"prev hash mismatch: {} vs {}".format(previous_hash, header['prev_block_hash'])
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bits, target = self._calculate_lbry_next_work_required(height, previous_header, header)
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assert bits == header['bits'], \
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"bits mismatch: {} vs {} (hash: {})".format(
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bits, header['bits'], self._hash_header(header))
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_pow_hash = self._pow_hash_header(header)
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assert int(b'0x' + _pow_hash, 16) <= target, \
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"insufficient proof of work: {} vs target {}".format(
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int(b'0x' + _pow_hash, 16), target)
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@staticmethod
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def _serialize(header):
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return b''.join([
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int_to_hex(header['version'], 4),
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rev_hex(header['prev_block_hash']),
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rev_hex(header['merkle_root']),
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rev_hex(header['claim_trie_root']),
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int_to_hex(int(header['timestamp']), 4),
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int_to_hex(int(header['bits']), 4),
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int_to_hex(int(header['nonce']), 4)
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])
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@staticmethod
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def _deserialize(height, header):
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return {
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'version': hex_to_int(header[0:4]),
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'prev_block_hash': hash_encode(header[4:36]),
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'merkle_root': hash_encode(header[36:68]),
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'claim_trie_root': hash_encode(header[68:100]),
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'timestamp': hex_to_int(header[100:104]),
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'bits': hex_to_int(header[104:108]),
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'nonce': hex_to_int(header[108:112]),
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'block_height': height
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}
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def _hash_header(self, header):
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if header is None:
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return b'0' * 64
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return hash_encode(double_sha256(unhexlify(self._serialize(header))))
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def _pow_hash_header(self, header):
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if header is None:
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return b'0' * 64
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return hash_encode(pow_hash(unhexlify(self._serialize(header))))
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def _calculate_lbry_next_work_required(self, height, first, last):
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""" See: lbrycrd/src/lbry.cpp """
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if height == 0:
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return self.ledger.genesis_bits, self.ledger.max_target
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if self.ledger.verify_bits_to_target:
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bits = last['bits']
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bitsN = (bits >> 24) & 0xff
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assert 0x03 <= bitsN <= 0x1f, \
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"First part of bits should be in [0x03, 0x1d], but it was {}".format(hex(bitsN))
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bitsBase = bits & 0xffffff
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assert 0x8000 <= bitsBase <= 0x7fffff, \
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"Second part of bits should be in [0x8000, 0x7fffff] but it was {}".format(bitsBase)
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# new target
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retargetTimespan = self.ledger.target_timespan
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nActualTimespan = last['timestamp'] - first['timestamp']
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nModulatedTimespan = retargetTimespan + (nActualTimespan - retargetTimespan) // 8
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nMinTimespan = retargetTimespan - (retargetTimespan // 8)
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nMaxTimespan = retargetTimespan + (retargetTimespan // 2)
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# Limit adjustment step
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if nModulatedTimespan < nMinTimespan:
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nModulatedTimespan = nMinTimespan
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elif nModulatedTimespan > nMaxTimespan:
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nModulatedTimespan = nMaxTimespan
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# Retarget
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bnPowLimit = _ArithUint256(self.ledger.max_target)
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bnNew = _ArithUint256.SetCompact(last['bits'])
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bnNew *= nModulatedTimespan
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bnNew //= nModulatedTimespan
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if bnNew > bnPowLimit:
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bnNew = bnPowLimit
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return bnNew.GetCompact(), bnNew._value
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class _ArithUint256:
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""" See: lbrycrd/src/arith_uint256.cpp """
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def __init__(self, value):
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self._value = value
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def __str__(self):
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return hex(self._value)
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@staticmethod
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def fromCompact(nCompact):
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"""Convert a compact representation into its value"""
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nSize = nCompact >> 24
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# the lower 23 bits
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nWord = nCompact & 0x007fffff
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if nSize <= 3:
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return nWord >> 8 * (3 - nSize)
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else:
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return nWord << 8 * (nSize - 3)
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@classmethod
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def SetCompact(cls, nCompact):
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return cls(cls.fromCompact(nCompact))
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def bits(self):
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"""Returns the position of the highest bit set plus one."""
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bn = bin(self._value)[2:]
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for i, d in enumerate(bn):
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if d:
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return (len(bn) - i) + 1
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return 0
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def GetLow64(self):
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return self._value & 0xffffffffffffffff
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def GetCompact(self):
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"""Convert a value into its compact representation"""
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nSize = (self.bits() + 7) // 8
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nCompact = 0
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if nSize <= 3:
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nCompact = self.GetLow64() << 8 * (3 - nSize)
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else:
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bn = _ArithUint256(self._value >> 8 * (nSize - 3))
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nCompact = bn.GetLow64()
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# The 0x00800000 bit denotes the sign.
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# Thus, if it is already set, divide the mantissa by 256 and increase the exponent.
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if nCompact & 0x00800000:
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nCompact >>= 8
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nSize += 1
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assert (nCompact & ~0x007fffff) == 0
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assert nSize < 256
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nCompact |= nSize << 24
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return nCompact
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def __mul__(self, x):
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# Take the mod because we are limited to an unsigned 256 bit number
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return _ArithUint256((self._value * x) % 2 ** 256)
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def __ifloordiv__(self, x):
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self._value = (self._value // x)
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return self
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def __gt__(self, x):
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return self._value > x._value
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