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#!/usr/bin/env python3
# Copyright (c) 2022- The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""
Test stalling logic during IBD
"""
import time
from test_framework.blocktools import (
create_block,
create_coinbase
)
from test_framework.messages import (
MSG_BLOCK,
MSG_TYPE_MASK,
)
from test_framework.p2p import (
CBlockHeader,
msg_block,
msg_headers,
P2PDataStore,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
)
class P2PStaller(P2PDataStore):
def __init__(self, stall_block):
self.stall_block = stall_block
super().__init__()
def on_getdata(self, message):
for inv in message.inv:
self.getdata_requests.append(inv.hash)
if (inv.type & MSG_TYPE_MASK) == MSG_BLOCK:
if (inv.hash != self.stall_block):
self.send_message(msg_block(self.block_store[inv.hash]))
def on_getheaders(self, message):
pass
class P2PIBDStallingTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
def run_test(self):
NUM_BLOCKS = 1025
NUM_PEERS = 4
node = self.nodes[0]
tip = int(node.getbestblockhash(), 16)
blocks = []
height = 1
block_time = node.getblock(node.getbestblockhash())['time'] + 1
self.log.info("Prepare blocks without sending them to the node")
block_dict = {}
for _ in range(NUM_BLOCKS):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
block_dict[blocks[-1].sha256] = blocks[-1]
stall_block = blocks[0].sha256
headers_message = msg_headers()
headers_message.headers = [CBlockHeader(b) for b in blocks[:NUM_BLOCKS-1]]
peers = []
self.log.info("Check that a staller does not get disconnected if the 1024 block lookahead buffer is filled")
for id in range(NUM_PEERS):
peers.append(node.add_outbound_p2p_connection(P2PStaller(stall_block), p2p_idx=id, connection_type="outbound-full-relay"))
peers[-1].block_store = block_dict
peers[-1].send_message(headers_message)
# Need to wait until 1023 blocks are received - the magic total bytes number is a workaround in lack of an rpc
# returning the number of downloaded (but not connected) blocks.
self.wait_until(lambda: self.total_bytes_recv_for_blocks() == 172761)
self.all_sync_send_with_ping(peers)
# If there was a peer marked for stalling, it would get disconnected
self.mocktime = int(time.time()) + 3
node.setmocktime(self.mocktime)
self.all_sync_send_with_ping(peers)
assert_equal(node.num_test_p2p_connections(), NUM_PEERS)
self.log.info("Check that increasing the window beyond 1024 blocks triggers stalling logic")
headers_message.headers = [CBlockHeader(b) for b in blocks]
with node.assert_debug_log(expected_msgs=['Stall started']):
for p in peers:
p.send_message(headers_message)
self.all_sync_send_with_ping(peers)
self.log.info("Check that the stalling peer is disconnected after 2 seconds")
self.mocktime += 3
node.setmocktime(self.mocktime)
peers[0].wait_for_disconnect()
assert_equal(node.num_test_p2p_connections(), NUM_PEERS - 1)
self.wait_until(lambda: self.is_block_requested(peers, stall_block))
# Make sure that SendMessages() is invoked, which assigns the missing block
# to another peer and starts the stalling logic for them
self.all_sync_send_with_ping(peers)
self.log.info("Check that the stalling timeout gets doubled to 4 seconds for the next staller")
# No disconnect after just 3 seconds
self.mocktime += 3
node.setmocktime(self.mocktime)
self.all_sync_send_with_ping(peers)
assert_equal(node.num_test_p2p_connections(), NUM_PEERS - 1)
self.mocktime += 2
node.setmocktime(self.mocktime)
self.wait_until(lambda: sum(x.is_connected for x in node.p2ps) == NUM_PEERS - 2)
self.wait_until(lambda: self.is_block_requested(peers, stall_block))
self.all_sync_send_with_ping(peers)
self.log.info("Check that the stalling timeout gets doubled to 8 seconds for the next staller")
# No disconnect after just 7 seconds
self.mocktime += 7
node.setmocktime(self.mocktime)
self.all_sync_send_with_ping(peers)
assert_equal(node.num_test_p2p_connections(), NUM_PEERS - 2)
self.mocktime += 2
node.setmocktime(self.mocktime)
self.wait_until(lambda: sum(x.is_connected for x in node.p2ps) == NUM_PEERS - 3)
self.wait_until(lambda: self.is_block_requested(peers, stall_block))
self.all_sync_send_with_ping(peers)
self.log.info("Provide the withheld block and check that stalling timeout gets reduced back to 2 seconds")
with node.assert_debug_log(expected_msgs=['Decreased stalling timeout to 2 seconds']):
for p in peers:
if p.is_connected and (stall_block in p.getdata_requests):
p.send_message(msg_block(block_dict[stall_block]))
self.log.info("Check that all outstanding blocks get connected")
self.wait_until(lambda: node.getblockcount() == NUM_BLOCKS)
def total_bytes_recv_for_blocks(self):
total = 0
for info in self.nodes[0].getpeerinfo():
if ("block" in info["bytesrecv_per_msg"].keys()):
total += info["bytesrecv_per_msg"]["block"]
return total
def all_sync_send_with_ping(self, peers):
for p in peers:
if p.is_connected:
p.sync_with_ping()
def is_block_requested(self, peers, hash):
for p in peers:
if p.is_connected and (hash in p.getdata_requests):
return True
return False
if __name__ == '__main__':
P2PIBDStallingTest().main()
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