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67 lines
2.9 KiB
Python
Executable File
67 lines
2.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2019-2021 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test that we reject low difficulty headers to prevent our block tree from filling up with useless bloat"""
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from test_framework.test_framework import BitcoinTestFramework
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NODE1_BLOCKS_REQUIRED = 15
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NODE2_BLOCKS_REQUIRED = 2047
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class RejectLowDifficultyHeadersTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 3
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# Node0 has no required chainwork; node1 requires 15 blocks on top of the genesis block; node2 requires 2047
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self.extra_args = [["-minimumchainwork=0x0"], ["-minimumchainwork=0x1f"], ["-minimumchainwork=0x1000"]]
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def setup_network(self):
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self.setup_nodes()
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self.connect_nodes(0, 1)
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self.connect_nodes(0, 2)
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self.sync_all()
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def test_chains_sync_when_long_enough(self):
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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")
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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)"]):
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self.generate(self.nodes[0], NODE1_BLOCKS_REQUIRED-1, sync_fun=self.no_op)
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for node in self.nodes[1:]:
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chaintips = node.getchaintips()
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assert(len(chaintips) == 1)
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assert {
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'height': 0,
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'hash': '0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206',
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'branchlen': 0,
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'status': 'active',
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} in chaintips
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self.log.info("Generate more blocks to satisfy node1's minchainwork requirement, and verify node2 still has no new headers in headers tree")
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with self.nodes[2].assert_debug_log(expected_msgs=["[net] Ignoring low-work chain (height=15)"]):
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self.generate(self.nodes[0], NODE1_BLOCKS_REQUIRED - self.nodes[0].getblockcount(), sync_fun=self.no_op)
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self.sync_blocks(self.nodes[0:2])
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assert {
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'height': 0,
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'hash': '0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206',
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'branchlen': 0,
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'status': 'active',
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} in self.nodes[2].getchaintips()
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assert(len(self.nodes[2].getchaintips()) == 1)
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self.log.info("Generate long chain for node0/node1")
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self.generate(self.nodes[0], NODE2_BLOCKS_REQUIRED-self.nodes[0].getblockcount(), sync_fun=self.no_op)
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self.log.info("Verify that node2 will sync the chain when it gets long enough")
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self.sync_blocks()
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def run_test(self):
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self.test_chains_sync_when_long_enough()
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if __name__ == '__main__':
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RejectLowDifficultyHeadersTest().main()
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