ce6762030f
9f9db39041 QA/mininode: Send all headers upfront in send_blocks_and_test to avoid sending an unconnected one (Luke Dashjr)
Pull request description:
While this doesn't currently trigger any problems, the network protocol does expect headers to be sent connectable in normal circumstances, and if too many are sent out of order will disconnect the peer.
ACKs for commit 9f9db3:
Tree-SHA512: 25b88718e4ba3d31aed2de7ece23fab9a0737fd6536c5e618ea8eb5a3a217dab0dffaebc4892df7993bcea7efb7c4fb5085fabebe99535b8f7fdde3c19df54ff
578 lines
22 KiB
Python
Executable file
578 lines
22 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2010 ArtForz -- public domain half-a-node
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# Copyright (c) 2012 Jeff Garzik
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# Copyright (c) 2010-2019 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Bitcoin P2P network half-a-node.
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This python code was modified from ArtForz' public domain half-a-node, as
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found in the mini-node branch of http://github.com/jgarzik/pynode.
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P2PConnection: A low-level connection object to a node's P2P interface
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P2PInterface: A high-level interface object for communicating to a node over P2P
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P2PDataStore: A p2p interface class that keeps a store of transactions and blocks
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and can respond correctly to getdata and getheaders messages"""
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import asyncio
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from collections import defaultdict
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from io import BytesIO
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import logging
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import struct
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import sys
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import threading
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from test_framework.messages import (
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CBlockHeader,
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MIN_VERSION_SUPPORTED,
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msg_addr,
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msg_block,
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MSG_BLOCK,
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msg_blocktxn,
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msg_cmpctblock,
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msg_feefilter,
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msg_getaddr,
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msg_getblocks,
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msg_getblocktxn,
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msg_getdata,
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msg_getheaders,
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msg_headers,
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msg_inv,
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msg_mempool,
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msg_notfound,
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msg_ping,
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msg_pong,
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msg_reject,
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msg_sendcmpct,
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msg_sendheaders,
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msg_tx,
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MSG_TX,
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MSG_TYPE_MASK,
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msg_verack,
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msg_version,
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NODE_NETWORK,
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NODE_WITNESS,
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sha256,
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)
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from test_framework.util import wait_until
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logger = logging.getLogger("TestFramework.mininode")
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MESSAGEMAP = {
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b"addr": msg_addr,
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b"block": msg_block,
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b"blocktxn": msg_blocktxn,
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b"cmpctblock": msg_cmpctblock,
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b"feefilter": msg_feefilter,
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b"getaddr": msg_getaddr,
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b"getblocks": msg_getblocks,
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b"getblocktxn": msg_getblocktxn,
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b"getdata": msg_getdata,
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b"getheaders": msg_getheaders,
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b"headers": msg_headers,
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b"inv": msg_inv,
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b"mempool": msg_mempool,
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b"notfound": msg_notfound,
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b"ping": msg_ping,
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b"pong": msg_pong,
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b"reject": msg_reject,
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b"sendcmpct": msg_sendcmpct,
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b"sendheaders": msg_sendheaders,
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b"tx": msg_tx,
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b"verack": msg_verack,
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b"version": msg_version,
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}
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MAGIC_BYTES = {
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"mainnet": b"\xf9\xbe\xb4\xd9", # mainnet
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"testnet3": b"\x0b\x11\x09\x07", # testnet3
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"regtest": b"\xfa\xbf\xb5\xda", # regtest
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}
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class P2PConnection(asyncio.Protocol):
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"""A low-level connection object to a node's P2P interface.
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This class is responsible for:
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- opening and closing the TCP connection to the node
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- reading bytes from and writing bytes to the socket
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- deserializing and serializing the P2P message header
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- logging messages as they are sent and received
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This class contains no logic for handing the P2P message payloads. It must be
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sub-classed and the on_message() callback overridden."""
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def __init__(self):
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# The underlying transport of the connection.
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# Should only call methods on this from the NetworkThread, c.f. call_soon_threadsafe
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self._transport = None
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@property
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def is_connected(self):
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return self._transport is not None
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def peer_connect(self, dstaddr, dstport, net="regtest"):
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assert not self.is_connected
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self.dstaddr = dstaddr
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self.dstport = dstport
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# The initial message to send after the connection was made:
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self.on_connection_send_msg = None
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self.recvbuf = b""
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self.magic_bytes = MAGIC_BYTES[net]
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logger.debug('Connecting to Bitcoin Node: %s:%d' % (self.dstaddr, self.dstport))
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loop = NetworkThread.network_event_loop
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conn_gen_unsafe = loop.create_connection(lambda: self, host=self.dstaddr, port=self.dstport)
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conn_gen = lambda: loop.call_soon_threadsafe(loop.create_task, conn_gen_unsafe)
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return conn_gen
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def peer_disconnect(self):
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# Connection could have already been closed by other end.
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NetworkThread.network_event_loop.call_soon_threadsafe(lambda: self._transport and self._transport.abort())
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# Connection and disconnection methods
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def connection_made(self, transport):
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"""asyncio callback when a connection is opened."""
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assert not self._transport
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logger.debug("Connected & Listening: %s:%d" % (self.dstaddr, self.dstport))
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self._transport = transport
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if self.on_connection_send_msg:
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self.send_message(self.on_connection_send_msg)
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self.on_connection_send_msg = None # Never used again
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self.on_open()
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def connection_lost(self, exc):
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"""asyncio callback when a connection is closed."""
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if exc:
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logger.warning("Connection lost to {}:{} due to {}".format(self.dstaddr, self.dstport, exc))
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else:
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logger.debug("Closed connection to: %s:%d" % (self.dstaddr, self.dstport))
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self._transport = None
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self.recvbuf = b""
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self.on_close()
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# Socket read methods
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def data_received(self, t):
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"""asyncio callback when data is read from the socket."""
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if len(t) > 0:
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self.recvbuf += t
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self._on_data()
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def _on_data(self):
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"""Try to read P2P messages from the recv buffer.
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This method reads data from the buffer in a loop. It deserializes,
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parses and verifies the P2P header, then passes the P2P payload to
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the on_message callback for processing."""
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try:
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while True:
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if len(self.recvbuf) < 4:
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return
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if self.recvbuf[:4] != self.magic_bytes:
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raise ValueError("magic bytes mismatch: {} != {}".format(repr(self.magic_bytes), repr(self.recvbuf)))
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if len(self.recvbuf) < 4 + 12 + 4 + 4:
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return
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command = self.recvbuf[4:4+12].split(b"\x00", 1)[0]
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msglen = struct.unpack("<i", self.recvbuf[4+12:4+12+4])[0]
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checksum = self.recvbuf[4+12+4:4+12+4+4]
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if len(self.recvbuf) < 4 + 12 + 4 + 4 + msglen:
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return
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msg = self.recvbuf[4+12+4+4:4+12+4+4+msglen]
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th = sha256(msg)
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h = sha256(th)
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if checksum != h[:4]:
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raise ValueError("got bad checksum " + repr(self.recvbuf))
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self.recvbuf = self.recvbuf[4+12+4+4+msglen:]
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if command not in MESSAGEMAP:
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raise ValueError("Received unknown command from %s:%d: '%s' %s" % (self.dstaddr, self.dstport, command, repr(msg)))
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f = BytesIO(msg)
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t = MESSAGEMAP[command]()
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t.deserialize(f)
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self._log_message("receive", t)
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self.on_message(t)
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except Exception as e:
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logger.exception('Error reading message:', repr(e))
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raise
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def on_message(self, message):
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"""Callback for processing a P2P payload. Must be overridden by derived class."""
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raise NotImplementedError
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# Socket write methods
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def send_message(self, message):
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"""Send a P2P message over the socket.
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This method takes a P2P payload, builds the P2P header and adds
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the message to the send buffer to be sent over the socket."""
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tmsg = self.build_message(message)
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self._log_message("send", message)
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return self.send_raw_message(tmsg)
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def send_raw_message(self, raw_message_bytes):
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if not self.is_connected:
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raise IOError('Not connected')
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def maybe_write():
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if not self._transport:
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return
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if self._transport.is_closing():
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return
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self._transport.write(raw_message_bytes)
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NetworkThread.network_event_loop.call_soon_threadsafe(maybe_write)
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# Class utility methods
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def build_message(self, message):
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"""Build a serialized P2P message"""
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command = message.command
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data = message.serialize()
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tmsg = self.magic_bytes
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tmsg += command
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tmsg += b"\x00" * (12 - len(command))
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tmsg += struct.pack("<I", len(data))
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th = sha256(data)
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h = sha256(th)
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tmsg += h[:4]
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tmsg += data
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return tmsg
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def _log_message(self, direction, msg):
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"""Logs a message being sent or received over the connection."""
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if direction == "send":
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log_message = "Send message to "
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elif direction == "receive":
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log_message = "Received message from "
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log_message += "%s:%d: %s" % (self.dstaddr, self.dstport, repr(msg)[:500])
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if len(log_message) > 500:
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log_message += "... (msg truncated)"
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logger.debug(log_message)
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class P2PInterface(P2PConnection):
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"""A high-level P2P interface class for communicating with a Bitcoin node.
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This class provides high-level callbacks for processing P2P message
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payloads, as well as convenience methods for interacting with the
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node over P2P.
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Individual testcases should subclass this and override the on_* methods
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if they want to alter message handling behaviour."""
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def __init__(self):
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super().__init__()
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# Track number of messages of each type received and the most recent
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# message of each type
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self.message_count = defaultdict(int)
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self.last_message = {}
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# A count of the number of ping messages we've sent to the node
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self.ping_counter = 1
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# The network services received from the peer
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self.nServices = 0
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def peer_connect(self, *args, services=NODE_NETWORK|NODE_WITNESS, send_version=True, **kwargs):
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create_conn = super().peer_connect(*args, **kwargs)
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if send_version:
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# Send a version msg
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vt = msg_version()
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vt.nServices = services
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vt.addrTo.ip = self.dstaddr
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vt.addrTo.port = self.dstport
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vt.addrFrom.ip = "0.0.0.0"
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vt.addrFrom.port = 0
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self.on_connection_send_msg = vt # Will be sent soon after connection_made
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return create_conn
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# Message receiving methods
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def on_message(self, message):
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"""Receive message and dispatch message to appropriate callback.
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We keep a count of how many of each message type has been received
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and the most recent message of each type."""
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with mininode_lock:
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try:
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command = message.command.decode('ascii')
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self.message_count[command] += 1
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self.last_message[command] = message
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getattr(self, 'on_' + command)(message)
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except:
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print("ERROR delivering %s (%s)" % (repr(message), sys.exc_info()[0]))
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raise
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# Callback methods. Can be overridden by subclasses in individual test
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# cases to provide custom message handling behaviour.
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def on_open(self):
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pass
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def on_close(self):
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pass
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def on_addr(self, message): pass
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def on_block(self, message): pass
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def on_blocktxn(self, message): pass
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def on_cmpctblock(self, message): pass
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def on_feefilter(self, message): pass
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def on_getaddr(self, message): pass
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def on_getblocks(self, message): pass
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def on_getblocktxn(self, message): pass
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def on_getdata(self, message): pass
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def on_getheaders(self, message): pass
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def on_headers(self, message): pass
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def on_mempool(self, message): pass
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def on_notfound(self, message): pass
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def on_pong(self, message): pass
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def on_reject(self, message): pass
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def on_sendcmpct(self, message): pass
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def on_sendheaders(self, message): pass
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def on_tx(self, message): pass
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def on_inv(self, message):
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want = msg_getdata()
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for i in message.inv:
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if i.type != 0:
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want.inv.append(i)
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if len(want.inv):
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self.send_message(want)
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def on_ping(self, message):
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self.send_message(msg_pong(message.nonce))
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def on_verack(self, message):
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pass
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def on_version(self, message):
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assert message.nVersion >= MIN_VERSION_SUPPORTED, "Version {} received. Test framework only supports versions greater than {}".format(message.nVersion, MIN_VERSION_SUPPORTED)
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self.send_message(msg_verack())
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self.nServices = message.nServices
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# Connection helper methods
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def wait_for_disconnect(self, timeout=60):
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test_function = lambda: not self.is_connected
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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# Message receiving helper methods
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def wait_for_block(self, blockhash, timeout=60):
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test_function = lambda: self.last_message.get("block") and self.last_message["block"].block.rehash() == blockhash
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_header(self, blockhash, timeout=60):
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def test_function():
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last_headers = self.last_message.get('headers')
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if not last_headers:
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return False
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return last_headers.headers[0].rehash() == blockhash
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_getdata(self, timeout=60):
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"""Waits for a getdata message.
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Receiving any getdata message will satisfy the predicate. the last_message["getdata"]
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value must be explicitly cleared before calling this method, or this will return
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immediately with success. TODO: change this method to take a hash value and only
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return true if the correct block/tx has been requested."""
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test_function = lambda: self.last_message.get("getdata")
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_getheaders(self, timeout=60):
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"""Waits for a getheaders message.
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Receiving any getheaders message will satisfy the predicate. the last_message["getheaders"]
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value must be explicitly cleared before calling this method, or this will return
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immediately with success. TODO: change this method to take a hash value and only
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return true if the correct block header has been requested."""
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test_function = lambda: self.last_message.get("getheaders")
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_inv(self, expected_inv, timeout=60):
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"""Waits for an INV message and checks that the first inv object in the message was as expected."""
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if len(expected_inv) > 1:
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raise NotImplementedError("wait_for_inv() will only verify the first inv object")
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test_function = lambda: self.last_message.get("inv") and \
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self.last_message["inv"].inv[0].type == expected_inv[0].type and \
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self.last_message["inv"].inv[0].hash == expected_inv[0].hash
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_verack(self, timeout=60):
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test_function = lambda: self.message_count["verack"]
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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# Message sending helper functions
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def send_and_ping(self, message, timeout=60):
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self.send_message(message)
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self.sync_with_ping(timeout=timeout)
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# Sync up with the node
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def sync_with_ping(self, timeout=60):
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self.send_message(msg_ping(nonce=self.ping_counter))
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test_function = lambda: self.last_message.get("pong") and self.last_message["pong"].nonce == self.ping_counter
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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self.ping_counter += 1
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# One lock for synchronizing all data access between the network event loop (see
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# NetworkThread below) and the thread running the test logic. For simplicity,
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# P2PConnection acquires this lock whenever delivering a message to a P2PInterface.
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# This lock should be acquired in the thread running the test logic to synchronize
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# access to any data shared with the P2PInterface or P2PConnection.
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mininode_lock = threading.RLock()
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class NetworkThread(threading.Thread):
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network_event_loop = None
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def __init__(self):
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super().__init__(name="NetworkThread")
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# There is only one event loop and no more than one thread must be created
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assert not self.network_event_loop
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NetworkThread.network_event_loop = asyncio.new_event_loop()
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def run(self):
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"""Start the network thread."""
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self.network_event_loop.run_forever()
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def close(self, timeout=10):
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"""Close the connections and network event loop."""
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self.network_event_loop.call_soon_threadsafe(self.network_event_loop.stop)
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wait_until(lambda: not self.network_event_loop.is_running(), timeout=timeout)
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self.network_event_loop.close()
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self.join(timeout)
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class P2PDataStore(P2PInterface):
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"""A P2P data store class.
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Keeps a block and transaction store and responds correctly to getdata and getheaders requests."""
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def __init__(self):
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super().__init__()
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# store of blocks. key is block hash, value is a CBlock object
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self.block_store = {}
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self.last_block_hash = ''
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# store of txs. key is txid, value is a CTransaction object
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self.tx_store = {}
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self.getdata_requests = []
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def on_getdata(self, message):
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"""Check for the tx/block in our stores and if found, reply with an inv message."""
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for inv in message.inv:
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self.getdata_requests.append(inv.hash)
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if (inv.type & MSG_TYPE_MASK) == MSG_TX and inv.hash in self.tx_store.keys():
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self.send_message(msg_tx(self.tx_store[inv.hash]))
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elif (inv.type & MSG_TYPE_MASK) == MSG_BLOCK and inv.hash in self.block_store.keys():
|
|
self.send_message(msg_block(self.block_store[inv.hash]))
|
|
else:
|
|
logger.debug('getdata message type {} received.'.format(hex(inv.type)))
|
|
|
|
def on_getheaders(self, message):
|
|
"""Search back through our block store for the locator, and reply with a headers message if found."""
|
|
|
|
locator, hash_stop = message.locator, message.hashstop
|
|
|
|
# Assume that the most recent block added is the tip
|
|
if not self.block_store:
|
|
return
|
|
|
|
headers_list = [self.block_store[self.last_block_hash]]
|
|
maxheaders = 2000
|
|
while headers_list[-1].sha256 not in locator.vHave:
|
|
# Walk back through the block store, adding headers to headers_list
|
|
# as we go.
|
|
prev_block_hash = headers_list[-1].hashPrevBlock
|
|
if prev_block_hash in self.block_store:
|
|
prev_block_header = CBlockHeader(self.block_store[prev_block_hash])
|
|
headers_list.append(prev_block_header)
|
|
if prev_block_header.sha256 == hash_stop:
|
|
# if this is the hashstop header, stop here
|
|
break
|
|
else:
|
|
logger.debug('block hash {} not found in block store'.format(hex(prev_block_hash)))
|
|
break
|
|
|
|
# Truncate the list if there are too many headers
|
|
headers_list = headers_list[:-maxheaders - 1:-1]
|
|
response = msg_headers(headers_list)
|
|
|
|
if response is not None:
|
|
self.send_message(response)
|
|
|
|
def send_blocks_and_test(self, blocks, node, *, success=True, force_send=False, reject_reason=None, expect_disconnect=False, timeout=60):
|
|
"""Send blocks to test node and test whether the tip advances.
|
|
|
|
- add all blocks to our block_store
|
|
- send a headers message for the final block
|
|
- the on_getheaders handler will ensure that any getheaders are responded to
|
|
- if force_send is False: wait for getdata for each of the blocks. The on_getdata handler will
|
|
ensure that any getdata messages are responded to. Otherwise send the full block unsolicited.
|
|
- if success is True: assert that the node's tip advances to the most recent block
|
|
- if success is False: assert that the node's tip doesn't advance
|
|
- if reject_reason is set: assert that the correct reject message is logged"""
|
|
|
|
with mininode_lock:
|
|
for block in blocks:
|
|
self.block_store[block.sha256] = block
|
|
self.last_block_hash = block.sha256
|
|
|
|
reject_reason = [reject_reason] if reject_reason else []
|
|
with node.assert_debug_log(expected_msgs=reject_reason):
|
|
if force_send:
|
|
for b in blocks:
|
|
self.send_message(msg_block(block=b))
|
|
else:
|
|
self.send_message(msg_headers([CBlockHeader(block) for block in blocks]))
|
|
wait_until(lambda: blocks[-1].sha256 in self.getdata_requests, timeout=timeout, lock=mininode_lock)
|
|
|
|
if expect_disconnect:
|
|
self.wait_for_disconnect(timeout=timeout)
|
|
else:
|
|
self.sync_with_ping(timeout=timeout)
|
|
|
|
if success:
|
|
wait_until(lambda: node.getbestblockhash() == blocks[-1].hash, timeout=timeout)
|
|
else:
|
|
assert node.getbestblockhash() != blocks[-1].hash
|
|
|
|
def send_txs_and_test(self, txs, node, *, success=True, expect_disconnect=False, reject_reason=None):
|
|
"""Send txs to test node and test whether they're accepted to the mempool.
|
|
|
|
- add all txs to our tx_store
|
|
- send tx messages for all txs
|
|
- if success is True/False: assert that the txs are/are not accepted to the mempool
|
|
- if expect_disconnect is True: Skip the sync with ping
|
|
- if reject_reason is set: assert that the correct reject message is logged."""
|
|
|
|
with mininode_lock:
|
|
for tx in txs:
|
|
self.tx_store[tx.sha256] = tx
|
|
|
|
reject_reason = [reject_reason] if reject_reason else []
|
|
with node.assert_debug_log(expected_msgs=reject_reason):
|
|
for tx in txs:
|
|
self.send_message(msg_tx(tx))
|
|
|
|
if expect_disconnect:
|
|
self.wait_for_disconnect()
|
|
else:
|
|
self.sync_with_ping()
|
|
|
|
raw_mempool = node.getrawmempool()
|
|
if success:
|
|
# Check that all txs are now in the mempool
|
|
for tx in txs:
|
|
assert tx.hash in raw_mempool, "{} not found in mempool".format(tx.hash)
|
|
else:
|
|
# Check that none of the txs are now in the mempool
|
|
for tx in txs:
|
|
assert tx.hash not in raw_mempool, "{} tx found in mempool".format(tx.hash)
|