6d016d70ee
This is an optimisation and possible hardening against traffic analysis. After a new block is mined, we sometimes receive "blockchain.scripthash.subscribe" notifications. If so, this is often due to the just mined block including mempool txs we already knew about. Normally we would call the "blockchain.scripthash.get_history" RPC, to get full history of the affected scripthash. Instead now we first optimistically guess that all mempool txs touching this scripthash just got mined and see if by assuming that we can reproduce the announced sh status. - if yes, we saved a network RTT by not having to call "blockchain.scripthash.get_history" - if no, we request the history from the server using the RPC
401 lines
22 KiB
Python
401 lines
22 KiB
Python
import asyncio
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import collections
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from typing import Optional, Sequence, Iterable
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import aiorpcx
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from aiorpcx import RPCError
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import electrum
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from electrum.interface import ServerAddr, Interface, PaddedRSTransport
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from electrum import util, blockchain
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from electrum.util import OldTaskGroup, bfh
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from electrum.logging import Logger
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from electrum.simple_config import SimpleConfig
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from electrum.transaction import Transaction
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from electrum import constants
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from electrum.wallet import Abstract_Wallet
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from electrum.blockchain import Blockchain
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from electrum.bitcoin import script_to_scripthash
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from electrum.synchronizer import history_status
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from . import ElectrumTestCase
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from . import restore_wallet_from_text__for_unittest
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class TestServerAddr(ElectrumTestCase):
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def test_from_str(self):
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self.assertEqual(ServerAddr(host="104.198.149.61", port=80, protocol="t"),
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ServerAddr.from_str("104.198.149.61:80:t"))
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self.assertEqual(ServerAddr(host="ecdsa.net", port=110, protocol="s"),
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ServerAddr.from_str("ecdsa.net:110:s"))
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self.assertEqual(ServerAddr(host="2400:6180:0:d1::86b:e001", port=50002, protocol="s"),
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ServerAddr.from_str("[2400:6180:0:d1::86b:e001]:50002:s"))
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self.assertEqual(ServerAddr(host="localhost", port=8080, protocol="s"),
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ServerAddr.from_str("localhost:8080:s"))
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def test_from_str_with_inference(self):
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self.assertEqual(None, ServerAddr.from_str_with_inference("104.198.149.61"))
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self.assertEqual(None, ServerAddr.from_str_with_inference("ecdsa.net"))
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self.assertEqual(None, ServerAddr.from_str_with_inference("2400:6180:0:d1::86b:e001"))
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self.assertEqual(None, ServerAddr.from_str_with_inference("[2400:6180:0:d1::86b:e001]"))
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self.assertEqual(ServerAddr(host="104.198.149.61", port=80, protocol="s"),
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ServerAddr.from_str_with_inference("104.198.149.61:80"))
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self.assertEqual(ServerAddr(host="ecdsa.net", port=110, protocol="s"),
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ServerAddr.from_str_with_inference("ecdsa.net:110"))
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self.assertEqual(ServerAddr(host="2400:6180:0:d1::86b:e001", port=50002, protocol="s"),
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ServerAddr.from_str_with_inference("[2400:6180:0:d1::86b:e001]:50002"))
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self.assertEqual(ServerAddr(host="104.198.149.61", port=80, protocol="t"),
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ServerAddr.from_str_with_inference("104.198.149.61:80:t"))
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self.assertEqual(ServerAddr(host="ecdsa.net", port=110, protocol="s"),
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ServerAddr.from_str_with_inference("ecdsa.net:110:s"))
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self.assertEqual(ServerAddr(host="2400:6180:0:d1::86b:e001", port=50002, protocol="s"),
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ServerAddr.from_str_with_inference("[2400:6180:0:d1::86b:e001]:50002:s"))
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def test_to_friendly_name(self):
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self.assertEqual("104.198.149.61:80:t",
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ServerAddr(host="104.198.149.61", port=80, protocol="t").to_friendly_name())
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self.assertEqual("ecdsa.net:110",
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ServerAddr(host="ecdsa.net", port=110, protocol="s").to_friendly_name())
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self.assertEqual("ecdsa.net:50001:t",
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ServerAddr(host="ecdsa.net", port=50001, protocol="t").to_friendly_name())
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self.assertEqual("[2400:6180:0:d1::86b:e001]:50002",
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ServerAddr(host="2400:6180:0:d1::86b:e001", port=50002, protocol="s").to_friendly_name())
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self.assertEqual("[2400:6180:0:d1::86b:e001]:50001:t",
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ServerAddr(host="2400:6180:0:d1::86b:e001", port=50001, protocol="t").to_friendly_name())
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class MockNetwork:
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def __init__(self, *, config: SimpleConfig):
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self.config = config
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self.asyncio_loop = util.get_asyncio_loop()
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self.taskgroup = OldTaskGroup()
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blockchain.read_blockchains(self.config)
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blockchain.init_headers_file_for_best_chain()
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self.proxy = None
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self.debug = True
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self.bhi_lock = asyncio.Lock()
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self.interface = None # type: Interface | None
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async def connection_down(self, interface: Interface):
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pass
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def get_network_timeout_seconds(self, request_type) -> int:
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return 10
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def check_interface_against_healthy_spread_of_connected_servers(self, iface_to_check: Interface) -> bool:
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return True
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def update_fee_estimates(self, *, fee_est: dict[int, int] = None):
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pass
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async def switch_unwanted_fork_interface(self):
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pass
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async def switch_lagging_interface(self):
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pass
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def blockchain(self) -> Blockchain:
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return self.interface.blockchain
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def get_local_height(self) -> int:
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return self.blockchain().height()
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# regtest chain:
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BLOCK_HEADERS = {
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0: bfh("0100000000000000000000000000000000000000000000000000000000000000000000003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adae5494dffff7f2002000000"),
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1: bfh("0000002006226e46111a0b59caaf126043eb5bbf28c34f3a5e332a1fc7b2b73cf188910f186c8dfd970a4545f79916bc1d75c9d00432f57c89209bf3bb115b7612848f509c25f45bffff7f2000000000"),
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2: bfh("00000020686bdfc6a3db73d5d93e8c9663a720a26ecb1ef20eb05af11b36cdbc57c19f7ebf2cbf153013a1c54abaf70e95198fcef2f3059cc6b4d0f7e876808e7d24d11cc825f45bffff7f2000000000"),
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3: bfh("00000020122baa14f3ef54985ae546d1611559e3f487bd2a0f46e8dbb52fbacc9e237972e71019d7feecd9b8596eca9a67032c5f4641b23b5d731dc393e37de7f9c2f299e725f45bffff7f2000000000"),
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4: bfh("00000020f8016f7ef3a17d557afe05d4ea7ab6bde1b2247b7643896c1b63d43a1598b747a3586da94c71753f27c075f57f44faf913c31177a0957bbda42e7699e3a2141aed25f45bffff7f2001000000"),
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5: bfh("000000201d589c6643c1d121d73b0573e5ee58ab575b8fdf16d507e7e915c5fbfbbfd05e7aee1d692d1615c3bdf52c291032144ce9e3b258a473c17c745047f3431ff8e2ee25f45bffff7f2000000000"),
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6: bfh("00000020b833ed46eea01d4c980f59feee44a66aa1162748b6801029565d1466790c405c3a141ce635cbb1cd2b3a4fcdd0a3380517845ba41736c82a79cab535d31128066526f45bffff7f2001000000"),
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7: bfh("00000020abe8e119d1877c9dc0dc502d1a253fb9a67967c57732d2f71ee0280e8381ff0a9690c2fe7c1a4450c74dc908fe94dd96c3b0637d51475e9e06a78e944a0c7fe28126f45bffff7f2000000000"),
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8: bfh("000000202ce41d94eb70e1518bc1f72523f84a903f9705d967481e324876e1f8cf4d3452148be228a4c3f2061bafe7efdfc4a8d5a94759464b9b5c619994d45dfcaf49e1a126f45bffff7f2000000000"),
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9: bfh("00000020552755b6c59f3d51e361d16281842a4e166007799665b5daed86a063dd89857415681cb2d00ff889193f6a68a93f5096aeb2d84ca0af6185a462555822552221a626f45bffff7f2000000000"),
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10: bfh("00000020a13a491cbefc93cd1bb1938f19957e22a134faf14c7dee951c45533e2c750f239dc087fc977b06c24a69c682d1afd1020e6dc1f087571ccec66310a786e1548fab26f45bffff7f2000000000"),
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11: bfh("00000020dbf3a9b55dfefbaf8b6e43a89cf833fa2e208bbc0c1c5d76c0d71b9e4a65337803b243756c25053253aeda309604363460a3911015929e68705bd89dff6fe064b026f45bffff7f2002000000"),
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12: bfh("000000203d0932b3b0c78eccb39a595a28ae4a7c966388648d7783fd1305ec8d40d4fe5fd67cb902a7d807cee7676cb543feec3e053aa824d5dfb528d5b94f9760313d9db726f45bffff7f2001000000"),
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}
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_active_server_sessions = set()
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def _get_active_server_session() -> 'ToyServerSession':
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assert 1 == len(_active_server_sessions), len(_active_server_sessions)
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return list(_active_server_sessions)[0]
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class ToyServerSession(aiorpcx.RPCSession, Logger):
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def __init__(self, *args, **kwargs):
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aiorpcx.RPCSession.__init__(self, *args, **kwargs)
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Logger.__init__(self)
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self.logger.debug(f'connection from {self.remote_address()}')
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self.cur_height = 6 # type: int # chain tip
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self.txs = {
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"bdae818ad3c1f261317738ae9284159bf54874356f186dbc7afd631dc1527fcb": bfh("020000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff025100ffffffff0200f2052a010000001600140297bde2689a3c79ffe050583b62f86f2d9dae540000000000000000266a24aa21a9ede2f61c3f71d1defd3fa999dfa36953755c690689799962b48bebd836974e8cf90120000000000000000000000000000000000000000000000000000000000000000000000000"),
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} # type: dict[str, bytes]
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self.txid_to_block_height = collections.defaultdict(int) # type: dict[str, int]
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self.subbed_headers = False
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self.notified_height = None # type: Optional[int]
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self.subbed_scripthashes = set() # type: set[str]
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self.sh_to_funding_txids = collections.defaultdict(set) # type: dict[str, set[str]]
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self.sh_to_spending_txids = collections.defaultdict(set) # type: dict[str, set[str]]
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self._method_counts = collections.defaultdict(int) # type: dict[str, int]
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_active_server_sessions.add(self)
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async def connection_lost(self):
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await super().connection_lost()
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self.logger.debug(f'{self.remote_address()} disconnected')
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_active_server_sessions.discard(self)
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async def handle_request(self, request):
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handlers = {
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'server.version': self._handle_server_version,
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'server.features': self._handle_server_features,
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'blockchain.estimatefee': self._handle_estimatefee,
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'blockchain.headers.subscribe': self._handle_headers_subscribe,
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'blockchain.block.header': self._handle_block_header,
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'blockchain.block.headers': self._handle_block_headers,
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'blockchain.scripthash.subscribe': self._handle_scripthash_subscribe,
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'blockchain.scripthash.get_history': self._handle_scripthash_get_history,
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'blockchain.transaction.get': self._handle_transaction_get,
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'blockchain.transaction.broadcast': self._handle_transaction_broadcast,
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'blockchain.transaction.get_merkle': self._handle_transaction_get_merkle,
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'server.ping': self._handle_ping,
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}
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handler = handlers.get(request.method)
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self._method_counts[request.method] += 1
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coro = aiorpcx.handler_invocation(handler, request)()
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return await coro
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async def _handle_server_version(self, client_name='', protocol_version=None):
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return ['best_server_impl/0.1', '1.4']
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async def _handle_server_features(self) -> dict:
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return {
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'genesis_hash': constants.net.GENESIS,
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'hosts': {"14.3.140.101": {"tcp_port": 51001, "ssl_port": 51002}},
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'protocol_max': '1.7.0',
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'protocol_min': '1.4.3',
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'pruning': None,
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'server_version': 'ElectrumX 1.19.0',
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'hash_function': 'sha256',
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}
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async def _handle_estimatefee(self, number, mode=None):
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return 1000
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def _get_headersub_result(self):
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return {'hex': BLOCK_HEADERS[self.cur_height].hex(), 'height': self.cur_height}
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async def _handle_headers_subscribe(self):
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self.subbed_headers = True
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return self._get_headersub_result()
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async def _handle_block_header(self, height):
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return BLOCK_HEADERS[height].hex()
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async def _handle_block_headers(self, start_height, count):
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assert start_height <= self.cur_height, (start_height, self.cur_height)
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last_height = min(start_height+count-1, self.cur_height) # [start_height, last_height]
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count = last_height - start_height + 1
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headers = b"".join(BLOCK_HEADERS[idx] for idx in range(start_height, last_height+1))
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return {'hex': headers.hex(), 'count': count, 'max': 2016}
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async def _handle_ping(self):
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return None
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async def _handle_transaction_get(self, tx_hash: str, verbose=False):
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assert not verbose
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rawtx = self.txs.get(tx_hash)
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if rawtx is None:
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DAEMON_ERROR = 2
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raise RPCError(DAEMON_ERROR, f'daemon error: unknown txid={tx_hash}')
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return rawtx.hex()
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async def _handle_transaction_get_merkle(self, tx_hash: str, height: int) -> dict:
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# Fake stuff. Client will ignore it due to config.NETWORK_SKIPMERKLECHECK
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return {
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"merkle":
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[
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"713d6c7e6ce7bbea708d61162231eaa8ecb31c4c5dd84f81c20409a90069cb24",
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"03dbaec78d4a52fbaf3c7aa5d3fccd9d8654f323940716ddf5ee2e4bda458fde",
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"e670224b23f156c27993ac3071940c0ff865b812e21e0a162fe7a005d6e57851",
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"369a1619a67c3108a8850118602e3669455c70cdcdb89248b64cc6325575b885",
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"4756688678644dcb27d62931f04013254a62aeee5dec139d1aac9f7b1f318112",
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"7b97e73abc043836fd890555bfce54757d387943a6860e5450525e8e9ab46be5",
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"61505055e8b639b7c64fd58bce6fc5c2378b92e025a02583303f69930091b1c3",
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"27a654ff1895385ac14a574a0415d3bbba9ec23a8774f22ec20d53dd0b5386ff",
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"5312ed87933075e60a9511857d23d460a085f3b6e9e5e565ad2443d223cfccdc",
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"94f60b14a9f106440a197054936e6fb92abbd69d6059b38fdf79b33fc864fca0",
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"2d64851151550e8c4d337f335ee28874401d55b358a66f1bafab2c3e9f48773d"
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],
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"block_height": height,
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"pos": 710,
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}
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async def _handle_transaction_broadcast(self, raw_tx: str) -> str:
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tx = Transaction(raw_tx)
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txid = tx.txid()
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self.txs[txid] = bfh(raw_tx)
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touched_sh = await self._process_added_tx(txid=txid)
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if touched_sh:
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await self._send_notifications(touched_sh=touched_sh)
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return txid
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async def _process_added_tx(self, *, txid: str) -> set[str]:
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"""Returns touched scripthashes."""
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tx = Transaction(self.txs[txid])
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touched_sh = set()
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# update sh_to_funding_txids
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for txout in tx.outputs():
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sh = script_to_scripthash(txout.scriptpubkey)
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self.sh_to_funding_txids[sh].add(txid)
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touched_sh.add(sh)
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# update sh_to_spending_txids
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for txin in tx.inputs():
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if parent_tx_raw := self.txs.get(txin.prevout.txid.hex()):
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parent_tx = Transaction(parent_tx_raw)
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ptxout = parent_tx.outputs()[txin.prevout.out_idx]
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sh = script_to_scripthash(ptxout.scriptpubkey)
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self.sh_to_spending_txids[sh].add(txid)
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touched_sh.add(sh)
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return touched_sh
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async def _handle_scripthash_subscribe(self, sh: str) -> Optional[str]:
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self.subbed_scripthashes.add(sh)
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hist = self._calc_sh_history(sh)
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return history_status(hist)
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async def _handle_scripthash_get_history(self, sh: str) -> Sequence[dict]:
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hist_tuples = self._calc_sh_history(sh)
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hist_dicts = [{"height": height, "tx_hash": txid} for (txid, height) in hist_tuples]
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for hist_dict in hist_dicts: # add "fee" key for mempool txs
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if hist_dict["height"] in (0, -1,):
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hist_dict["fee"] = 0
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return hist_dicts
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def _calc_sh_history(self, sh: str) -> Sequence[tuple[str, int]]:
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txids = self.sh_to_funding_txids[sh] | self.sh_to_spending_txids[sh]
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hist = []
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for txid in txids:
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bh = self.txid_to_block_height[txid]
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hist.append((txid, bh))
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hist.sort(key=lambda x: x[1]) # FIXME put mempool txs last
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return hist
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async def _send_notifications(self, *, touched_sh: Iterable[str], height_changed: bool = False) -> None:
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if height_changed and self.subbed_headers and self.notified_height != self.cur_height:
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self.notified_height = self.cur_height
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args = (self._get_headersub_result(),)
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await self.send_notification('blockchain.headers.subscribe', args)
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touched_sh = set(sh for sh in touched_sh if sh in self.subbed_scripthashes)
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for sh in touched_sh:
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hist = self._calc_sh_history(sh)
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args = (sh, history_status(hist))
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await self.send_notification("blockchain.scripthash.subscribe", args)
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async def mine_block(self, *, txids_mined: Iterable[str] = None):
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if txids_mined is None:
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txids_mined = []
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self.cur_height += 1
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touched_sh = set()
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for txid in txids_mined:
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self.txid_to_block_height[txid] = self.cur_height
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touched_sh |= await self._process_added_tx(txid=txid)
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await self._send_notifications(touched_sh=touched_sh, height_changed=True)
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class TestInterface(ElectrumTestCase):
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REGTEST = True
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def setUp(self):
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super().setUp()
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self.config = SimpleConfig({'electrum_path': self.electrum_path})
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self.config.NETWORK_SKIPMERKLECHECK = True
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self._orig_WAIT_FOR_BUFFER_GROWTH_SECONDS = PaddedRSTransport.WAIT_FOR_BUFFER_GROWTH_SECONDS
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PaddedRSTransport.WAIT_FOR_BUFFER_GROWTH_SECONDS = 0
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def tearDown(self):
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PaddedRSTransport.WAIT_FOR_BUFFER_GROWTH_SECONDS = self._orig_WAIT_FOR_BUFFER_GROWTH_SECONDS
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super().tearDown()
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async def asyncSetUp(self):
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await super().asyncSetUp()
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self._server: asyncio.base_events.Server = await aiorpcx.serve_rs(ToyServerSession, "127.0.0.1")
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server_socket_addr = self._server.sockets[0].getsockname()
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self._server_port = server_socket_addr[1]
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|
self.network = MockNetwork(config=self.config)
|
|
|
|
async def asyncTearDown(self):
|
|
if self.network.interface:
|
|
await self.network.interface.close()
|
|
self._server.close()
|
|
await self._server.wait_closed()
|
|
await super().asyncTearDown()
|
|
|
|
async def _start_iface_and_wait_for_sync(self):
|
|
interface = Interface(network=self.network, server=ServerAddr(host="127.0.0.1", port=self._server_port, protocol="t"))
|
|
self.network.interface = interface
|
|
await util.wait_for2(interface.ready, 5)
|
|
await interface._blockchain_updated.wait()
|
|
return interface
|
|
|
|
async def test_client_syncs_headers_to_tip(self):
|
|
interface = await self._start_iface_and_wait_for_sync()
|
|
self.assertEqual(_get_active_server_session().cur_height, interface.tip)
|
|
self.assertFalse(interface.got_disconnected.is_set())
|
|
|
|
async def test_transaction_get(self):
|
|
interface = await self._start_iface_and_wait_for_sync()
|
|
# try requesting tx unknown to server:
|
|
with self.assertRaises(RPCError) as ctx:
|
|
await interface.get_transaction("deadbeef"*8)
|
|
self.assertTrue("unknown txid" in ctx.exception.message)
|
|
# try requesting known tx:
|
|
rawtx = await interface.get_transaction("bdae818ad3c1f261317738ae9284159bf54874356f186dbc7afd631dc1527fcb")
|
|
self.assertEqual(rawtx, _get_active_server_session().txs["bdae818ad3c1f261317738ae9284159bf54874356f186dbc7afd631dc1527fcb"].hex())
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.transaction.get"], 2)
|
|
|
|
async def test_transaction_broadcast(self):
|
|
interface = await self._start_iface_and_wait_for_sync()
|
|
rawtx1 = "020000000001010000000000000000000000000000000000000000000000000000000000000000ffffffff025200ffffffff0200f2052a010000001600140297bde2689a3c79ffe050583b62f86f2d9dae540000000000000000266a24aa21a9ede2f61c3f71d1defd3fa999dfa36953755c690689799962b48bebd836974e8cf90120000000000000000000000000000000000000000000000000000000000000000000000000"
|
|
tx = Transaction(rawtx1)
|
|
# broadcast
|
|
await interface.broadcast_transaction(tx)
|
|
self.assertEqual(bfh(rawtx1), _get_active_server_session().txs.get(tx.txid()))
|
|
# now request tx.
|
|
# as we just broadcast this same tx, this will hit the client iface cache, and won't call the server.
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.transaction.get"], 0)
|
|
rawtx2 = await interface.get_transaction(tx.txid())
|
|
self.assertEqual(rawtx1, rawtx2)
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.transaction.get"], 0)
|
|
|
|
async def test_dont_request_gethistory_if_status_change_results_from_mempool_txs_simply_getting_mined(self):
|
|
"""After a new block is mined, we recv "blockchain.scripthash.subscribe" notifs.
|
|
We opportunistically guess the scripthash status changed purely because touching mempool txs just got mined.
|
|
If the guess is correct, we won't call the "blockchain.scripthash.get_history" RPC.
|
|
"""
|
|
interface = await self._start_iface_and_wait_for_sync()
|
|
w1 = restore_wallet_from_text__for_unittest("9dk", path=None, config=self.config)['wallet'] # type: Abstract_Wallet
|
|
w1.start_network(self.network)
|
|
await w1.up_to_date_changed_event.wait()
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.scripthash.get_history"], 0)
|
|
# fund w1 (in mempool)
|
|
funding_tx = "01000000000101e855888b77b1688d08985b863bfe85b354049b4eba923db9b5cf37089975d5d10000000000fdffffff0280969800000000001600140297bde2689a3c79ffe050583b62f86f2d9dae5460abe9000000000016001472df47551b6e7e0c8428814d2e572bc5ac773dda024730440220383efa2f0f5b87f8ce5d6b6eaf48cba03bf522b23fbb23b2ac54ff9d9a8f6a8802206f67d1f909f3c7a22ac0308ac4c19853ffca3a9317e1d7e0c88cc3a86853aaac0121035061949222555a0df490978fe6e7ebbaa96332ecb5c266918fd800c0eef736e7358d1400"
|
|
funding_txid = await _get_active_server_session()._handle_transaction_broadcast(funding_tx)
|
|
await w1.up_to_date_changed_event.wait()
|
|
while not w1.is_up_to_date():
|
|
await w1.up_to_date_changed_event.wait()
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.scripthash.get_history"], 1)
|
|
self.assertEqual(
|
|
w1.adb.get_address_history("bcrt1qq2tmmcngng78nllq2pvrkchcdukemtj5jnxz44"),
|
|
{funding_txid: 0})
|
|
# mine funding tx
|
|
await _get_active_server_session().mine_block(txids_mined=[funding_txid])
|
|
await w1.up_to_date_changed_event.wait()
|
|
while not w1.is_up_to_date():
|
|
await w1.up_to_date_changed_event.wait()
|
|
# see if we managed to guess new history, and hence did not need to call get_history RPC
|
|
self.assertEqual(_get_active_server_session()._method_counts["blockchain.scripthash.get_history"], 1)
|
|
self.assertEqual(
|
|
w1.adb.get_address_history("bcrt1qq2tmmcngng78nllq2pvrkchcdukemtj5jnxz44"),
|
|
{funding_txid: 7})
|
|
|