You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
291 lines
13 KiB
291 lines
13 KiB
#!/usr/bin/env python3 |
|
# Copyright (c) 2015-2020 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 processing of unrequested blocks. |
|
|
|
Setup: two nodes, node0 + node1, not connected to each other. Node1 will have |
|
nMinimumChainWork set to 0x10, so it won't process low-work unrequested blocks. |
|
|
|
We have one P2PInterface connection to node0 called test_node, and one to node1 |
|
called min_work_node. |
|
|
|
The test: |
|
1. Generate one block on each node, to leave IBD. |
|
|
|
2. Mine a new block on each tip, and deliver to each node from node's peer. |
|
The tip should advance for node0, but node1 should skip processing due to |
|
nMinimumChainWork. |
|
|
|
Node1 is unused in tests 3-7: |
|
|
|
3. Mine a block that forks from the genesis block, and deliver to test_node. |
|
Node0 should not process this block (just accept the header), because it |
|
is unrequested and doesn't have more or equal work to the tip. |
|
|
|
4a,b. Send another two blocks that build on the forking block. |
|
Node0 should process the second block but be stuck on the shorter chain, |
|
because it's missing an intermediate block. |
|
|
|
4c.Send 288 more blocks on the longer chain (the number of blocks ahead |
|
we currently store). |
|
Node0 should process all but the last block (too far ahead in height). |
|
|
|
5. Send a duplicate of the block in #3 to Node0. |
|
Node0 should not process the block because it is unrequested, and stay on |
|
the shorter chain. |
|
|
|
6. Send Node0 an inv for the height 3 block produced in #4 above. |
|
Node0 should figure out that Node0 has the missing height 2 block and send a |
|
getdata. |
|
|
|
7. Send Node0 the missing block again. |
|
Node0 should process and the tip should advance. |
|
|
|
8. Create a fork which is invalid at a height longer than the current chain |
|
(ie to which the node will try to reorg) but which has headers built on top |
|
of the invalid block. Check that we get disconnected if we send more headers |
|
on the chain the node now knows to be invalid. |
|
|
|
9. Test Node1 is able to sync when connected to node0 (which should have sufficient |
|
work on its chain). |
|
""" |
|
|
|
import time |
|
|
|
from test_framework.blocktools import create_block, create_coinbase, create_tx_with_script |
|
from test_framework.messages import CBlockHeader, CInv, MSG_BLOCK, msg_block, msg_headers, msg_inv |
|
from test_framework.p2p import p2p_lock, P2PInterface |
|
from test_framework.test_framework import BitcoinTestFramework |
|
from test_framework.util import ( |
|
assert_equal, |
|
assert_raises_rpc_error, |
|
) |
|
|
|
|
|
class AcceptBlockTest(BitcoinTestFramework): |
|
def set_test_params(self): |
|
self.setup_clean_chain = True |
|
self.num_nodes = 2 |
|
self.extra_args = [[], ["-minimumchainwork=0x10"]] |
|
|
|
def setup_network(self): |
|
self.setup_nodes() |
|
|
|
def run_test(self): |
|
test_node = self.nodes[0].add_p2p_connection(P2PInterface()) |
|
min_work_node = self.nodes[1].add_p2p_connection(P2PInterface()) |
|
|
|
# 1. Have nodes mine a block (leave IBD) |
|
[n.generatetoaddress(1, n.get_deterministic_priv_key().address) for n in self.nodes] |
|
tips = [int("0x" + n.getbestblockhash(), 0) for n in self.nodes] |
|
|
|
# 2. Send one block that builds on each tip. |
|
# This should be accepted by node0 |
|
blocks_h2 = [] # the height 2 blocks on each node's chain |
|
block_time = int(time.time()) + 1 |
|
for i in range(2): |
|
blocks_h2.append(create_block(tips[i], create_coinbase(2), block_time)) |
|
blocks_h2[i].solve() |
|
block_time += 1 |
|
test_node.send_and_ping(msg_block(blocks_h2[0])) |
|
min_work_node.send_and_ping(msg_block(blocks_h2[1])) |
|
|
|
assert_equal(self.nodes[0].getblockcount(), 2) |
|
assert_equal(self.nodes[1].getblockcount(), 1) |
|
self.log.info("First height 2 block accepted by node0; correctly rejected by node1") |
|
|
|
# 3. Send another block that builds on genesis. |
|
block_h1f = create_block(int("0x" + self.nodes[0].getblockhash(0), 0), create_coinbase(1), block_time) |
|
block_time += 1 |
|
block_h1f.solve() |
|
test_node.send_and_ping(msg_block(block_h1f)) |
|
|
|
tip_entry_found = False |
|
for x in self.nodes[0].getchaintips(): |
|
if x['hash'] == block_h1f.hash: |
|
assert_equal(x['status'], "headers-only") |
|
tip_entry_found = True |
|
assert tip_entry_found |
|
assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, block_h1f.hash) |
|
|
|
# 4. Send another two block that build on the fork. |
|
block_h2f = create_block(block_h1f.sha256, create_coinbase(2), block_time) |
|
block_time += 1 |
|
block_h2f.solve() |
|
test_node.send_and_ping(msg_block(block_h2f)) |
|
|
|
# Since the earlier block was not processed by node, the new block |
|
# can't be fully validated. |
|
tip_entry_found = False |
|
for x in self.nodes[0].getchaintips(): |
|
if x['hash'] == block_h2f.hash: |
|
assert_equal(x['status'], "headers-only") |
|
tip_entry_found = True |
|
assert tip_entry_found |
|
|
|
# But this block should be accepted by node since it has equal work. |
|
self.nodes[0].getblock(block_h2f.hash) |
|
self.log.info("Second height 2 block accepted, but not reorg'ed to") |
|
|
|
# 4b. Now send another block that builds on the forking chain. |
|
block_h3 = create_block(block_h2f.sha256, create_coinbase(3), block_h2f.nTime+1) |
|
block_h3.solve() |
|
test_node.send_and_ping(msg_block(block_h3)) |
|
|
|
# Since the earlier block was not processed by node, the new block |
|
# can't be fully validated. |
|
tip_entry_found = False |
|
for x in self.nodes[0].getchaintips(): |
|
if x['hash'] == block_h3.hash: |
|
assert_equal(x['status'], "headers-only") |
|
tip_entry_found = True |
|
assert tip_entry_found |
|
self.nodes[0].getblock(block_h3.hash) |
|
|
|
# But this block should be accepted by node since it has more work. |
|
self.nodes[0].getblock(block_h3.hash) |
|
self.log.info("Unrequested more-work block accepted") |
|
|
|
# 4c. Now mine 288 more blocks and deliver; all should be processed but |
|
# the last (height-too-high) on node (as long as it is not missing any headers) |
|
tip = block_h3 |
|
all_blocks = [] |
|
for i in range(288): |
|
next_block = create_block(tip.sha256, create_coinbase(i + 4), tip.nTime+1) |
|
next_block.solve() |
|
all_blocks.append(next_block) |
|
tip = next_block |
|
|
|
# Now send the block at height 5 and check that it wasn't accepted (missing header) |
|
test_node.send_and_ping(msg_block(all_blocks[1])) |
|
assert_raises_rpc_error(-5, "Block not found", self.nodes[0].getblock, all_blocks[1].hash) |
|
assert_raises_rpc_error(-5, "Block not found", self.nodes[0].getblockheader, all_blocks[1].hash) |
|
|
|
# The block at height 5 should be accepted if we provide the missing header, though |
|
headers_message = msg_headers() |
|
headers_message.headers.append(CBlockHeader(all_blocks[0])) |
|
test_node.send_message(headers_message) |
|
test_node.send_and_ping(msg_block(all_blocks[1])) |
|
self.nodes[0].getblock(all_blocks[1].hash) |
|
|
|
# Now send the blocks in all_blocks |
|
for i in range(288): |
|
test_node.send_message(msg_block(all_blocks[i])) |
|
test_node.sync_with_ping() |
|
|
|
# Blocks 1-287 should be accepted, block 288 should be ignored because it's too far ahead |
|
for x in all_blocks[:-1]: |
|
self.nodes[0].getblock(x.hash) |
|
assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[-1].hash) |
|
|
|
# 5. Test handling of unrequested block on the node that didn't process |
|
# Should still not be processed (even though it has a child that has more |
|
# work). |
|
|
|
# The node should have requested the blocks at some point, so |
|
# disconnect/reconnect first |
|
|
|
self.nodes[0].disconnect_p2ps() |
|
self.nodes[1].disconnect_p2ps() |
|
|
|
test_node = self.nodes[0].add_p2p_connection(P2PInterface()) |
|
|
|
test_node.send_and_ping(msg_block(block_h1f)) |
|
assert_equal(self.nodes[0].getblockcount(), 2) |
|
self.log.info("Unrequested block that would complete more-work chain was ignored") |
|
|
|
# 6. Try to get node to request the missing block. |
|
# Poke the node with an inv for block at height 3 and see if that |
|
# triggers a getdata on block 2 (it should if block 2 is missing). |
|
with p2p_lock: |
|
# Clear state so we can check the getdata request |
|
test_node.last_message.pop("getdata", None) |
|
test_node.send_message(msg_inv([CInv(MSG_BLOCK, block_h3.sha256)])) |
|
|
|
test_node.sync_with_ping() |
|
with p2p_lock: |
|
getdata = test_node.last_message["getdata"] |
|
|
|
# Check that the getdata includes the right block |
|
assert_equal(getdata.inv[0].hash, block_h1f.sha256) |
|
self.log.info("Inv at tip triggered getdata for unprocessed block") |
|
|
|
# 7. Send the missing block for the third time (now it is requested) |
|
test_node.send_and_ping(msg_block(block_h1f)) |
|
assert_equal(self.nodes[0].getblockcount(), 290) |
|
self.nodes[0].getblock(all_blocks[286].hash) |
|
assert_equal(self.nodes[0].getbestblockhash(), all_blocks[286].hash) |
|
assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, all_blocks[287].hash) |
|
self.log.info("Successfully reorged to longer chain") |
|
|
|
# 8. Create a chain which is invalid at a height longer than the |
|
# current chain, but which has more blocks on top of that |
|
block_289f = create_block(all_blocks[284].sha256, create_coinbase(289), all_blocks[284].nTime+1) |
|
block_289f.solve() |
|
block_290f = create_block(block_289f.sha256, create_coinbase(290), block_289f.nTime+1) |
|
block_290f.solve() |
|
block_291 = create_block(block_290f.sha256, create_coinbase(291), block_290f.nTime+1) |
|
# block_291 spends a coinbase below maturity! |
|
block_291.vtx.append(create_tx_with_script(block_290f.vtx[0], 0, script_sig=b"42", amount=1)) |
|
block_291.hashMerkleRoot = block_291.calc_merkle_root() |
|
block_291.solve() |
|
block_292 = create_block(block_291.sha256, create_coinbase(292), block_291.nTime+1) |
|
block_292.solve() |
|
|
|
# Now send all the headers on the chain and enough blocks to trigger reorg |
|
headers_message = msg_headers() |
|
headers_message.headers.append(CBlockHeader(block_289f)) |
|
headers_message.headers.append(CBlockHeader(block_290f)) |
|
headers_message.headers.append(CBlockHeader(block_291)) |
|
headers_message.headers.append(CBlockHeader(block_292)) |
|
test_node.send_and_ping(headers_message) |
|
|
|
tip_entry_found = False |
|
for x in self.nodes[0].getchaintips(): |
|
if x['hash'] == block_292.hash: |
|
assert_equal(x['status'], "headers-only") |
|
tip_entry_found = True |
|
assert tip_entry_found |
|
assert_raises_rpc_error(-1, "Block not found on disk", self.nodes[0].getblock, block_292.hash) |
|
|
|
test_node.send_message(msg_block(block_289f)) |
|
test_node.send_and_ping(msg_block(block_290f)) |
|
|
|
self.nodes[0].getblock(block_289f.hash) |
|
self.nodes[0].getblock(block_290f.hash) |
|
|
|
test_node.send_message(msg_block(block_291)) |
|
|
|
# At this point we've sent an obviously-bogus block, wait for full processing |
|
# without assuming whether we will be disconnected or not |
|
try: |
|
# Only wait a short while so the test doesn't take forever if we do get |
|
# disconnected |
|
test_node.sync_with_ping(timeout=1) |
|
except AssertionError: |
|
test_node.wait_for_disconnect() |
|
|
|
self.nodes[0].disconnect_p2ps() |
|
test_node = self.nodes[0].add_p2p_connection(P2PInterface()) |
|
|
|
# We should have failed reorg and switched back to 290 (but have block 291) |
|
assert_equal(self.nodes[0].getblockcount(), 290) |
|
assert_equal(self.nodes[0].getbestblockhash(), all_blocks[286].hash) |
|
assert_equal(self.nodes[0].getblock(block_291.hash)["confirmations"], -1) |
|
|
|
# Now send a new header on the invalid chain, indicating we're forked off, and expect to get disconnected |
|
block_293 = create_block(block_292.sha256, create_coinbase(293), block_292.nTime+1) |
|
block_293.solve() |
|
headers_message = msg_headers() |
|
headers_message.headers.append(CBlockHeader(block_293)) |
|
test_node.send_message(headers_message) |
|
test_node.wait_for_disconnect() |
|
|
|
# 9. Connect node1 to node0 and ensure it is able to sync |
|
self.connect_nodes(0, 1) |
|
self.sync_blocks([self.nodes[0], self.nodes[1]]) |
|
self.log.info("Successfully synced nodes 1 and 0") |
|
|
|
if __name__ == '__main__': |
|
AcceptBlockTest().main()
|
|
|