forked from LBRYCommunity/lbry-sdk
328 lines
12 KiB
Python
328 lines
12 KiB
Python
import os
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import six
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import hashlib
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import logging
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from binascii import hexlify, unhexlify
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from typing import Dict, Type, Iterable
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from operator import itemgetter
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from collections import namedtuple
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from twisted.internet import defer
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from torba import baseaccount
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from torba import basedatabase
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from torba import baseheader
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from torba import basenetwork
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from torba import basetransaction
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from torba.stream import StreamController, execute_serially
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from torba.hash import hash160, double_sha256, Base58
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log = logging.getLogger(__name__)
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class LedgerRegistry(type):
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ledgers = {} # type: Dict[str, Type[BaseLedger]]
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def __new__(mcs, name, bases, attrs):
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cls = super(LedgerRegistry, mcs).__new__(mcs, name, bases, attrs) # type: Type[BaseLedger]
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if not (name == 'BaseLedger' and not bases):
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ledger_id = cls.get_id()
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assert ledger_id not in mcs.ledgers,\
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'Ledger with id "{}" already registered.'.format(ledger_id)
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mcs.ledgers[ledger_id] = cls
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return cls
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@classmethod
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def get_ledger_class(mcs, ledger_id): # type: (str) -> Type[BaseLedger]
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return mcs.ledgers[ledger_id]
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class TransactionEvent(namedtuple('TransactionEvent', ('address', 'tx', 'height', 'is_verified'))):
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pass
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class BaseLedger(six.with_metaclass(LedgerRegistry)):
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name = None
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symbol = None
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network_name = None
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account_class = baseaccount.BaseAccount
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database_class = basedatabase.BaseDatabase
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headers_class = baseheader.BaseHeaders
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network_class = basenetwork.BaseNetwork
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transaction_class = basetransaction.BaseTransaction
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secret_prefix = None
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pubkey_address_prefix = None
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script_address_prefix = None
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extended_public_key_prefix = None
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extended_private_key_prefix = None
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default_fee_per_byte = 10
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def __init__(self, config=None):
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self.config = config or {}
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self.db = self.config.get('db') or self.database_class(
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os.path.join(self.path, "blockchain.db")
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) # type: basedatabase.BaseDatabase
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self.network = self.config.get('network') or self.network_class(self)
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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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self.accounts = []
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self.headers = self.config.get('headers') or self.headers_class(self)
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self.fee_per_byte = self.config.get('fee_per_byte', self.default_fee_per_byte)
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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.on_transaction.listen(
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lambda e: log.info('({}) on_transaction: address={}, height={}, is_verified={}, tx.id={}'.format(
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self.get_id(), e.address, e.height, e.is_verified, e.tx.id)
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)
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)
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self._on_header_controller = StreamController()
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self.on_header = self._on_header_controller.stream
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self._transaction_processing_locks = {}
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@classmethod
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def get_id(cls):
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return '{}_{}'.format(cls.symbol.lower(), cls.network_name.lower())
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@classmethod
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def hash160_to_address(cls, h160):
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raw_address = cls.pubkey_address_prefix + h160
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return Base58.encode(bytearray(raw_address + double_sha256(raw_address)[0:4]))
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@staticmethod
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def address_to_hash160(address):
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bytes = Base58.decode(address)
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prefix, pubkey_bytes, addr_checksum = bytes[0], bytes[1:21], bytes[21:]
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return pubkey_bytes
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@classmethod
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def public_key_to_address(cls, public_key):
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return cls.hash160_to_address(hash160(public_key))
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@staticmethod
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def private_key_to_wif(private_key):
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return b'\x1c' + private_key + b'\x01'
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@property
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def path(self):
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return os.path.join(self.config['data_path'], self.get_id())
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def get_input_output_fee(self, io):
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""" Fee based on size of the input / output. """
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return self.fee_per_byte * io.size
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def get_transaction_base_fee(self, tx):
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""" Fee for the transaction header and all outputs; without inputs. """
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return self.fee_per_byte * tx.base_size
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@defer.inlineCallbacks
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def add_account(self, account): # type: (baseaccount.BaseAccount) -> None
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self.accounts.append(account)
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if self.network.is_connected:
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yield self.update_account(account)
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@defer.inlineCallbacks
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def get_transaction(self, txhash):
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raw, height, is_verified = yield self.db.get_transaction(txhash)
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if raw is not None:
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defer.returnValue(self.transaction_class(raw))
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@defer.inlineCallbacks
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def get_private_key_for_address(self, address):
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match = yield self.db.get_address(address)
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if match:
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for account in self.accounts:
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if match['account'] == account.public_key.address:
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defer.returnValue(account.get_private_key(match['chain'], match['position']))
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@defer.inlineCallbacks
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def get_effective_amount_estimators(self, funding_accounts):
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# type: (Iterable[baseaccount.BaseAccount]) -> defer.Deferred
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estimators = []
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for account in funding_accounts:
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utxos = yield account.get_unspent_outputs()
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for utxo in utxos:
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estimators.append(utxo.get_estimator(self))
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defer.returnValue(estimators)
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@defer.inlineCallbacks
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def get_local_status(self, address):
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address_details = yield self.db.get_address(address)
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history = address_details['history'] or ''
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hash = hashlib.sha256(history.encode()).digest()
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defer.returnValue(hexlify(hash))
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@defer.inlineCallbacks
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def get_local_history(self, address):
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address_details = yield self.db.get_address(address)
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history = address_details['history'] or ''
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parts = history.split(':')[:-1]
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defer.returnValue(list(zip(parts[0::2], map(int, parts[1::2]))))
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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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@defer.inlineCallbacks
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def is_valid_transaction(self, tx, height):
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height <= len(self.headers) or defer.returnValue(False)
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merkle = yield self.network.get_merkle(tx.id, height)
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merkle_root = self.get_root_of_merkle_tree(merkle['merkle'], merkle['pos'], tx.hash)
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header = self.headers[height]
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defer.returnValue(merkle_root == header['merkle_root'])
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@defer.inlineCallbacks
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def start(self):
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if not os.path.exists(self.path):
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os.mkdir(self.path)
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yield self.db.start()
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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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@defer.inlineCallbacks
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def stop(self):
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yield self.network.stop()
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yield self.db.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, 2000)
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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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self._on_header_controller.add(height_sought)
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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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self._on_header_controller.add(len(self.headers))
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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: (baseaccount.BaseAccount) -> 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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yield account.ensure_address_gap()
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addresses = yield account.get_addresses(max_used_times=0)
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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 = yield account.ensure_address_gap()
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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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all_addresses = yield account.get_addresses()
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yield defer.DeferredList(
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list(map(self.subscribe_history, all_addresses))
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)
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@defer.inlineCallbacks
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def update_history(self, address):
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remote_history = yield self.network.get_history(address)
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local_history = yield self.get_local_history(address)
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synced_history = []
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for i, (hex_id, remote_height) in enumerate(map(itemgetter('tx_hash', 'height'), remote_history)):
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synced_history.append((hex_id, remote_height))
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if i < len(local_history) and local_history[i] == (hex_id, remote_height):
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continue
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lock = self._transaction_processing_locks.setdefault(hex_id, defer.DeferredLock())
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yield lock.acquire()
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try:
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# see if we have a local copy of transaction, otherwise fetch it from server
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raw, local_height, is_verified = yield self.db.get_transaction(hex_id)
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save_tx = None
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if raw is None:
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_raw = yield self.network.get_transaction(hex_id)
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tx = self.transaction_class(unhexlify(_raw))
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save_tx = 'insert'
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else:
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tx = self.transaction_class(raw)
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if remote_height > 0 and not is_verified:
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is_verified = yield self.is_valid_transaction(tx, remote_height)
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is_verified = 1 if is_verified else 0
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if save_tx is None:
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save_tx = 'update'
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yield self.db.save_transaction_io(
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save_tx, tx, remote_height, is_verified, address, self.address_to_hash160(address),
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''.join('{}:{}:'.format(tx_id, tx_height) for tx_id, tx_height in synced_history)
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)
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log.debug("{}: sync'ed tx {} for address: {}, height: {}, verified: {}".format(
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self.get_id(), hex_id, address, remote_height, is_verified
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))
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self._on_transaction_controller.add(TransactionEvent(address, tx, remote_height, is_verified))
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except Exception as e:
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log.exception('Failed to synchronize transaction:')
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raise e
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finally:
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lock.release()
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if not lock.locked and hex_id in self._transaction_processing_locks:
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del self._transaction_processing_locks[hex_id]
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@defer.inlineCallbacks
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def subscribe_history(self, address):
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remote_status = yield self.network.subscribe_address(address)
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local_status = yield self.get_local_status(address)
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if local_status != remote_status:
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yield self.update_history(address)
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@defer.inlineCallbacks
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def process_status(self, response):
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address, remote_status = response
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local_status = yield self.get_local_status(address)
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if local_status != remote_status:
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yield self.update_history(address)
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def broadcast(self, tx):
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return self.network.broadcast(hexlify(tx.raw).decode())
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