1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
#!/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")
self.mocktime = int(time.time()) + 1
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.
bytes_recv = 172761 if not self.options.v2transport else 169692
self.wait_until(lambda: self.total_bytes_recv_for_blocks() == bytes_recv)
self.all_sync_send_with_ping(peers)
# If there was a peer marked for stalling, it would get disconnected
self.mocktime += 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(__file__).main()
|
