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Alchemy/bitcoin-22.0/test/functional/p2p_sendheaders.py

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#!/usr/bin/env python3
# Copyright (c) 2014-2020 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 behavior of headers messages to announce blocks.
Setup:
- Two nodes:
- node0 is the node-under-test. We create two p2p connections to it. The
first p2p connection is a control and should only ever receive inv's. The
second p2p connection tests the headers sending logic.
- node1 is used to create reorgs.
test_null_locators
==================
Sends two getheaders requests with null locator values. First request's hashstop
value refers to validated block, while second request's hashstop value refers to
a block which hasn't been validated. Verifies only the first request returns
headers.
test_nonnull_locators
=====================
Part 1: No headers announcements before "sendheaders"
a. node mines a block [expect: inv]
send getdata for the block [expect: block]
b. node mines another block [expect: inv]
send getheaders and getdata [expect: headers, then block]
c. node mines another block [expect: inv]
peer mines a block, announces with header [expect: getdata]
d. node mines another block [expect: inv]
Part 2: After "sendheaders", headers announcements should generally work.
a. peer sends sendheaders [expect: no response]
peer sends getheaders with current tip [expect: no response]
b. node mines a block [expect: tip header]
c. for N in 1, ..., 10:
* for announce-type in {inv, header}
- peer mines N blocks, announces with announce-type
[ expect: getheaders/getdata or getdata, deliver block(s) ]
- node mines a block [ expect: 1 header ]
Part 3: Headers announcements stop after large reorg and resume after getheaders or inv from peer.
- For response-type in {inv, getheaders}
* node mines a 7 block reorg [ expect: headers announcement of 8 blocks ]
* node mines an 8-block reorg [ expect: inv at tip ]
* peer responds with getblocks/getdata [expect: inv, blocks ]
* node mines another block [ expect: inv at tip, peer sends getdata, expect: block ]
* node mines another block at tip [ expect: inv ]
* peer responds with getheaders with an old hashstop more than 8 blocks back [expect: headers]
* peer requests block [ expect: block ]
* node mines another block at tip [ expect: inv, peer sends getdata, expect: block ]
* peer sends response-type [expect headers if getheaders, getheaders/getdata if mining new block]
* node mines 1 block [expect: 1 header, peer responds with getdata]
Part 4: Test direct fetch behavior
a. Announce 2 old block headers.
Expect: no getdata requests.
b. Announce 3 new blocks via 1 headers message.
Expect: one getdata request for all 3 blocks.
(Send blocks.)
c. Announce 1 header that forks off the last two blocks.
Expect: no response.
d. Announce 1 more header that builds on that fork.
Expect: one getdata request for two blocks.
e. Announce 16 more headers that build on that fork.
Expect: getdata request for 14 more blocks.
f. Announce 1 more header that builds on that fork.
Expect: no response.
Part 5: Test handling of headers that don't connect.
a. Repeat 10 times:
1. Announce a header that doesn't connect.
Expect: getheaders message
2. Send headers chain.
Expect: getdata for the missing blocks, tip update.
b. Then send 9 more headers that don't connect.
Expect: getheaders message each time.
c. Announce a header that does connect.
Expect: no response.
d. Announce 49 headers that don't connect.
Expect: getheaders message each time.
e. Announce one more that doesn't connect.
Expect: disconnect.
"""
from test_framework.blocktools import create_block, create_coinbase
from test_framework.messages import CInv
from test_framework.p2p import (
CBlockHeader,
NODE_WITNESS,
P2PInterface,
p2p_lock,
MSG_BLOCK,
msg_block,
msg_getblocks,
msg_getdata,
msg_getheaders,
msg_headers,
msg_inv,
msg_sendheaders,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
)
DIRECT_FETCH_RESPONSE_TIME = 0.05
class BaseNode(P2PInterface):
def __init__(self):
super().__init__()
self.block_announced = False
self.last_blockhash_announced = None
self.recent_headers_announced = []
def send_get_data(self, block_hashes):
"""Request data for a list of block hashes."""
msg = msg_getdata()
for x in block_hashes:
msg.inv.append(CInv(MSG_BLOCK, x))
self.send_message(msg)
def send_get_headers(self, locator, hashstop):
msg = msg_getheaders()
msg.locator.vHave = locator
msg.hashstop = hashstop
self.send_message(msg)
def send_block_inv(self, blockhash):
msg = msg_inv()
msg.inv = [CInv(MSG_BLOCK, blockhash)]
self.send_message(msg)
def send_header_for_blocks(self, new_blocks):
headers_message = msg_headers()
headers_message.headers = [CBlockHeader(b) for b in new_blocks]
self.send_message(headers_message)
def send_getblocks(self, locator):
getblocks_message = msg_getblocks()
getblocks_message.locator.vHave = locator
self.send_message(getblocks_message)
def wait_for_block_announcement(self, block_hash, timeout=60):
test_function = lambda: self.last_blockhash_announced == block_hash
self.wait_until(test_function, timeout=timeout)
def on_inv(self, message):
self.block_announced = True
self.last_blockhash_announced = message.inv[-1].hash
def on_headers(self, message):
if len(message.headers):
self.block_announced = True
for x in message.headers:
x.calc_sha256()
# append because headers may be announced over multiple messages.
self.recent_headers_announced.append(x.sha256)
self.last_blockhash_announced = message.headers[-1].sha256
def clear_block_announcements(self):
with p2p_lock:
self.block_announced = False
self.last_message.pop("inv", None)
self.last_message.pop("headers", None)
self.recent_headers_announced = []
def check_last_headers_announcement(self, headers):
"""Test whether the last headers announcements received are right.
Headers may be announced across more than one message."""
test_function = lambda: (len(self.recent_headers_announced) >= len(headers))
self.wait_until(test_function)
with p2p_lock:
assert_equal(self.recent_headers_announced, headers)
self.block_announced = False
self.last_message.pop("headers", None)
self.recent_headers_announced = []
def check_last_inv_announcement(self, inv):
"""Test whether the last announcement received had the right inv.
inv should be a list of block hashes."""
test_function = lambda: self.block_announced
self.wait_until(test_function)
with p2p_lock:
compare_inv = []
if "inv" in self.last_message:
compare_inv = [x.hash for x in self.last_message["inv"].inv]
assert_equal(compare_inv, inv)
self.block_announced = False
self.last_message.pop("inv", None)
class SendHeadersTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 2
def mine_blocks(self, count):
"""Mine count blocks and return the new tip."""
# Clear out block announcements from each p2p listener
[x.clear_block_announcements() for x in self.nodes[0].p2ps]
self.nodes[0].generatetoaddress(count, self.nodes[0].get_deterministic_priv_key().address)
return int(self.nodes[0].getbestblockhash(), 16)
def mine_reorg(self, length):
"""Mine a reorg that invalidates length blocks (replacing them with # length+1 blocks).
Note: we clear the state of our p2p connections after the
to-be-reorged-out blocks are mined, so that we don't break later tests.
return the list of block hashes newly mined."""
# make sure all invalidated blocks are node0's
self.nodes[0].generatetoaddress(length, self.nodes[0].get_deterministic_priv_key().address)
self.sync_blocks(self.nodes, wait=0.1)
for x in self.nodes[0].p2ps:
x.wait_for_block_announcement(int(self.nodes[0].getbestblockhash(), 16))
x.clear_block_announcements()
tip_height = self.nodes[1].getblockcount()
hash_to_invalidate = self.nodes[1].getblockhash(tip_height - (length - 1))
self.nodes[1].invalidateblock(hash_to_invalidate)
all_hashes = self.nodes[1].generatetoaddress(length + 1, self.nodes[1].get_deterministic_priv_key().address) # Must be longer than the orig chain
self.sync_blocks(self.nodes, wait=0.1)
return [int(x, 16) for x in all_hashes]
def run_test(self):
# Setup the p2p connections
inv_node = self.nodes[0].add_p2p_connection(BaseNode())
# Make sure NODE_NETWORK is not set for test_node, so no block download
# will occur outside of direct fetching
test_node = self.nodes[0].add_p2p_connection(BaseNode(), services=NODE_WITNESS)
self.test_null_locators(test_node, inv_node)
self.test_nonnull_locators(test_node, inv_node)
def test_null_locators(self, test_node, inv_node):
tip = self.nodes[0].getblockheader(self.nodes[0].generatetoaddress(1, self.nodes[0].get_deterministic_priv_key().address)[0])
tip_hash = int(tip["hash"], 16)
inv_node.check_last_inv_announcement(inv=[tip_hash])
test_node.check_last_inv_announcement(inv=[tip_hash])
self.log.info("Verify getheaders with null locator and valid hashstop returns headers.")
test_node.clear_block_announcements()
test_node.send_get_headers(locator=[], hashstop=tip_hash)
test_node.check_last_headers_announcement(headers=[tip_hash])
self.log.info("Verify getheaders with null locator and invalid hashstop does not return headers.")
block = create_block(int(tip["hash"], 16), create_coinbase(tip["height"] + 1), tip["mediantime"] + 1)
block.solve()
test_node.send_header_for_blocks([block])
test_node.clear_block_announcements()
test_node.send_get_headers(locator=[], hashstop=int(block.hash, 16))
test_node.sync_with_ping()
assert_equal(test_node.block_announced, False)
inv_node.clear_block_announcements()
test_node.send_message(msg_block(block))
inv_node.check_last_inv_announcement(inv=[int(block.hash, 16)])
def test_nonnull_locators(self, test_node, inv_node):
tip = int(self.nodes[0].getbestblockhash(), 16)
# PART 1
# 1. Mine a block; expect inv announcements each time
self.log.info("Part 1: headers don't start before sendheaders message...")
for i in range(4):
self.log.debug("Part 1.{}: starting...".format(i))
old_tip = tip
tip = self.mine_blocks(1)
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_inv_announcement(inv=[tip])
# Try a few different responses; none should affect next announcement
if i == 0:
# first request the block
test_node.send_get_data([tip])
test_node.wait_for_block(tip)
elif i == 1:
# next try requesting header and block
test_node.send_get_headers(locator=[old_tip], hashstop=tip)
test_node.send_get_data([tip])
test_node.wait_for_block(tip)
test_node.clear_block_announcements() # since we requested headers...
elif i == 2:
# this time announce own block via headers
inv_node.clear_block_announcements()
height = self.nodes[0].getblockcount()
last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time']
block_time = last_time + 1
new_block = create_block(tip, create_coinbase(height + 1), block_time)
new_block.solve()
test_node.send_header_for_blocks([new_block])
test_node.wait_for_getdata([new_block.sha256])
test_node.send_and_ping(msg_block(new_block)) # make sure this block is processed
inv_node.wait_until(lambda: inv_node.block_announced)
inv_node.clear_block_announcements()
test_node.clear_block_announcements()
self.log.info("Part 1: success!")
self.log.info("Part 2: announce blocks with headers after sendheaders message...")
# PART 2
# 2. Send a sendheaders message and test that headers announcements
# commence and keep working.
test_node.send_message(msg_sendheaders())
prev_tip = int(self.nodes[0].getbestblockhash(), 16)
test_node.send_get_headers(locator=[prev_tip], hashstop=0)
test_node.sync_with_ping()
# Now that we've synced headers, headers announcements should work
tip = self.mine_blocks(1)
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_headers_announcement(headers=[tip])
height = self.nodes[0].getblockcount() + 1
block_time += 10 # Advance far enough ahead
for i in range(10):
self.log.debug("Part 2.{}: starting...".format(i))
# Mine i blocks, and alternate announcing either via
# inv (of tip) or via headers. After each, new blocks
# mined by the node should successfully be announced
# with block header, even though the blocks are never requested
for j in range(2):
self.log.debug("Part 2.{}.{}: starting...".format(i, j))
blocks = []
for _ in range(i + 1):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
if j == 0:
# Announce via inv
test_node.send_block_inv(tip)
test_node.wait_for_getheaders()
# Should have received a getheaders now
test_node.send_header_for_blocks(blocks)
# Test that duplicate inv's won't result in duplicate
# getdata requests, or duplicate headers announcements
[inv_node.send_block_inv(x.sha256) for x in blocks]
test_node.wait_for_getdata([x.sha256 for x in blocks])
inv_node.sync_with_ping()
else:
# Announce via headers
test_node.send_header_for_blocks(blocks)
test_node.wait_for_getdata([x.sha256 for x in blocks])
# Test that duplicate headers won't result in duplicate
# getdata requests (the check is further down)
inv_node.send_header_for_blocks(blocks)
inv_node.sync_with_ping()
[test_node.send_message(msg_block(x)) for x in blocks]
test_node.sync_with_ping()
inv_node.sync_with_ping()
# This block should not be announced to the inv node (since it also
# broadcast it)
assert "inv" not in inv_node.last_message
assert "headers" not in inv_node.last_message
tip = self.mine_blocks(1)
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_headers_announcement(headers=[tip])
height += 1
block_time += 1
self.log.info("Part 2: success!")
self.log.info("Part 3: headers announcements can stop after large reorg, and resume after headers/inv from peer...")
# PART 3. Headers announcements can stop after large reorg, and resume after
# getheaders or inv from peer.
for j in range(2):
self.log.debug("Part 3.{}: starting...".format(j))
# First try mining a reorg that can propagate with header announcement
new_block_hashes = self.mine_reorg(length=7)
tip = new_block_hashes[-1]
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_headers_announcement(headers=new_block_hashes)
block_time += 8
# Mine a too-large reorg, which should be announced with a single inv
new_block_hashes = self.mine_reorg(length=8)
tip = new_block_hashes[-1]
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_inv_announcement(inv=[tip])
block_time += 9
fork_point = self.nodes[0].getblock("%064x" % new_block_hashes[0])["previousblockhash"]
fork_point = int(fork_point, 16)
# Use getblocks/getdata
test_node.send_getblocks(locator=[fork_point])
test_node.check_last_inv_announcement(inv=new_block_hashes)
test_node.send_get_data(new_block_hashes)
test_node.wait_for_block(new_block_hashes[-1])
for i in range(3):
self.log.debug("Part 3.{}.{}: starting...".format(j, i))
# Mine another block, still should get only an inv
tip = self.mine_blocks(1)
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_inv_announcement(inv=[tip])
if i == 0:
# Just get the data -- shouldn't cause headers announcements to resume
test_node.send_get_data([tip])
test_node.wait_for_block(tip)
elif i == 1:
# Send a getheaders message that shouldn't trigger headers announcements
# to resume (best header sent will be too old)
test_node.send_get_headers(locator=[fork_point], hashstop=new_block_hashes[1])
test_node.send_get_data([tip])
test_node.wait_for_block(tip)
elif i == 2:
# This time, try sending either a getheaders to trigger resumption
# of headers announcements, or mine a new block and inv it, also
# triggering resumption of headers announcements.
test_node.send_get_data([tip])
test_node.wait_for_block(tip)
if j == 0:
test_node.send_get_headers(locator=[tip], hashstop=0)
test_node.sync_with_ping()
else:
test_node.send_block_inv(tip)
test_node.sync_with_ping()
# New blocks should now be announced with header
tip = self.mine_blocks(1)
inv_node.check_last_inv_announcement(inv=[tip])
test_node.check_last_headers_announcement(headers=[tip])
self.log.info("Part 3: success!")
self.log.info("Part 4: Testing direct fetch behavior...")
tip = self.mine_blocks(1)
height = self.nodes[0].getblockcount() + 1
last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time']
block_time = last_time + 1
# Create 2 blocks. Send the blocks, then send the headers.
blocks = []
for _ in range(2):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
inv_node.send_message(msg_block(blocks[-1]))
inv_node.sync_with_ping() # Make sure blocks are processed
test_node.last_message.pop("getdata", None)
test_node.send_header_for_blocks(blocks)
test_node.sync_with_ping()
# should not have received any getdata messages
with p2p_lock:
assert "getdata" not in test_node.last_message
# This time, direct fetch should work
blocks = []
for _ in range(3):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
test_node.send_header_for_blocks(blocks)
test_node.sync_with_ping()
test_node.wait_for_getdata([x.sha256 for x in blocks], timeout=DIRECT_FETCH_RESPONSE_TIME)
[test_node.send_message(msg_block(x)) for x in blocks]
test_node.sync_with_ping()
# Now announce a header that forks the last two blocks
tip = blocks[0].sha256
height -= 2
blocks = []
# Create extra blocks for later
for _ in range(20):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
# Announcing one block on fork should not trigger direct fetch
# (less work than tip)
test_node.last_message.pop("getdata", None)
test_node.send_header_for_blocks(blocks[0:1])
test_node.sync_with_ping()
with p2p_lock:
assert "getdata" not in test_node.last_message
# Announcing one more block on fork should trigger direct fetch for
# both blocks (same work as tip)
test_node.send_header_for_blocks(blocks[1:2])
test_node.sync_with_ping()
test_node.wait_for_getdata([x.sha256 for x in blocks[0:2]], timeout=DIRECT_FETCH_RESPONSE_TIME)
# Announcing 16 more headers should trigger direct fetch for 14 more
# blocks
test_node.send_header_for_blocks(blocks[2:18])
test_node.sync_with_ping()
test_node.wait_for_getdata([x.sha256 for x in blocks[2:16]], timeout=DIRECT_FETCH_RESPONSE_TIME)
# Announcing 1 more header should not trigger any response
test_node.last_message.pop("getdata", None)
test_node.send_header_for_blocks(blocks[18:19])
test_node.sync_with_ping()
with p2p_lock:
assert "getdata" not in test_node.last_message
self.log.info("Part 4: success!")
# Now deliver all those blocks we announced.
[test_node.send_message(msg_block(x)) for x in blocks]
self.log.info("Part 5: Testing handling of unconnecting headers")
# First we test that receipt of an unconnecting header doesn't prevent
# chain sync.
for i in range(10):
self.log.debug("Part 5.{}: starting...".format(i))
test_node.last_message.pop("getdata", None)
blocks = []
# Create two more blocks.
for _ in range(2):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
# Send the header of the second block -> this won't connect.
with p2p_lock:
test_node.last_message.pop("getheaders", None)
test_node.send_header_for_blocks([blocks[1]])
test_node.wait_for_getheaders()
test_node.send_header_for_blocks(blocks)
test_node.wait_for_getdata([x.sha256 for x in blocks])
[test_node.send_message(msg_block(x)) for x in blocks]
test_node.sync_with_ping()
assert_equal(int(self.nodes[0].getbestblockhash(), 16), blocks[1].sha256)
blocks = []
# Now we test that if we repeatedly don't send connecting headers, we
# don't go into an infinite loop trying to get them to connect.
MAX_UNCONNECTING_HEADERS = 10
for _ in range(MAX_UNCONNECTING_HEADERS + 1):
blocks.append(create_block(tip, create_coinbase(height), block_time))
blocks[-1].solve()
tip = blocks[-1].sha256
block_time += 1
height += 1
for i in range(1, MAX_UNCONNECTING_HEADERS):
# Send a header that doesn't connect, check that we get a getheaders.
with p2p_lock:
test_node.last_message.pop("getheaders", None)
test_node.send_header_for_blocks([blocks[i]])
test_node.wait_for_getheaders()
# Next header will connect, should re-set our count:
test_node.send_header_for_blocks([blocks[0]])
# Remove the first two entries (blocks[1] would connect):
blocks = blocks[2:]
# Now try to see how many unconnecting headers we can send
# before we get disconnected. Should be 5*MAX_UNCONNECTING_HEADERS
for i in range(5 * MAX_UNCONNECTING_HEADERS - 1):
# Send a header that doesn't connect, check that we get a getheaders.
with p2p_lock:
test_node.last_message.pop("getheaders", None)
test_node.send_header_for_blocks([blocks[i % len(blocks)]])
test_node.wait_for_getheaders()
# Eventually this stops working.
test_node.send_header_for_blocks([blocks[-1]])
# Should get disconnected
test_node.wait_for_disconnect()
self.log.info("Part 5: success!")
# Finally, check that the inv node never received a getdata request,
# throughout the test
assert "getdata" not in inv_node.last_message
if __name__ == '__main__':
SendHeadersTest().main()