diff options
Diffstat (limited to 'test/functional/p2p_headers_sync_with_minchainwork.py')
-rwxr-xr-x | test/functional/p2p_headers_sync_with_minchainwork.py | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/test/functional/p2p_headers_sync_with_minchainwork.py b/test/functional/p2p_headers_sync_with_minchainwork.py new file mode 100755 index 0000000000..8008125ed6 --- /dev/null +++ b/test/functional/p2p_headers_sync_with_minchainwork.py @@ -0,0 +1,66 @@ +#!/usr/bin/env python3 +# Copyright (c) 2019-2021 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 that we reject low difficulty headers to prevent our block tree from filling up with useless bloat""" + +from test_framework.test_framework import BitcoinTestFramework + +NODE1_BLOCKS_REQUIRED = 15 +NODE2_BLOCKS_REQUIRED = 2047 + + +class RejectLowDifficultyHeadersTest(BitcoinTestFramework): + def set_test_params(self): + self.setup_clean_chain = True + self.num_nodes = 3 + # Node0 has no required chainwork; node1 requires 15 blocks on top of the genesis block; node2 requires 2047 + self.extra_args = [["-minimumchainwork=0x0"], ["-minimumchainwork=0x1f"], ["-minimumchainwork=0x1000"]] + + def setup_network(self): + self.setup_nodes() + self.connect_nodes(0, 1) + self.connect_nodes(0, 2) + self.sync_all() + + def test_chains_sync_when_long_enough(self): + self.log.info("Generate blocks on the node with no required chainwork, and verify nodes 1 and 2 have no new headers in their headers tree") + with self.nodes[1].assert_debug_log(expected_msgs=["[net] Ignoring low-work chain (height=14)"]), self.nodes[2].assert_debug_log(expected_msgs=["[net] Ignoring low-work chain (height=14)"]): + self.generate(self.nodes[0], NODE1_BLOCKS_REQUIRED-1, sync_fun=self.no_op) + + for node in self.nodes[1:]: + chaintips = node.getchaintips() + assert(len(chaintips) == 1) + assert { + 'height': 0, + 'hash': '0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206', + 'branchlen': 0, + 'status': 'active', + } in chaintips + + self.log.info("Generate more blocks to satisfy node1's minchainwork requirement, and verify node2 still has no new headers in headers tree") + with self.nodes[2].assert_debug_log(expected_msgs=["[net] Ignoring low-work chain (height=15)"]): + self.generate(self.nodes[0], NODE1_BLOCKS_REQUIRED - self.nodes[0].getblockcount(), sync_fun=self.no_op) + self.sync_blocks(self.nodes[0:2]) + + assert { + 'height': 0, + 'hash': '0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206', + 'branchlen': 0, + 'status': 'active', + } in self.nodes[2].getchaintips() + + assert(len(self.nodes[2].getchaintips()) == 1) + + self.log.info("Generate long chain for node0/node1") + self.generate(self.nodes[0], NODE2_BLOCKS_REQUIRED-self.nodes[0].getblockcount(), sync_fun=self.no_op) + + self.log.info("Verify that node2 will sync the chain when it gets long enough") + self.sync_blocks() + + def run_test(self): + self.test_chains_sync_when_long_enough() + + +if __name__ == '__main__': + RejectLowDifficultyHeadersTest().main() |