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91 lines
4.0 KiB
91 lines
4.0 KiB
#!/usr/bin/env python3
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# Copyright (c) 2017-2020 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 logic for setting nMinimumChainWork on command line.
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Nodes don't consider themselves out of "initial block download" until
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their active chain has more work than nMinimumChainWork.
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Nodes don't download blocks from a peer unless the peer's best known block
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has more work than nMinimumChainWork.
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While in initial block download, nodes won't relay blocks to their peers, so
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test that this parameter functions as intended by verifying that block relay
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only succeeds past a given node once its nMinimumChainWork has been exceeded.
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"""
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import time
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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# 2 hashes required per regtest block (with no difficulty adjustment)
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REGTEST_WORK_PER_BLOCK = 2
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class MinimumChainWorkTest(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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self.extra_args = [[], ["-minimumchainwork=0x65"], ["-minimumchainwork=0x65"]]
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self.node_min_work = [0, 101, 101]
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def setup_network(self):
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# This test relies on the chain setup being:
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# node0 <- node1 <- node2
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# Before leaving IBD, nodes prefer to download blocks from outbound
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# peers, so ensure that we're mining on an outbound peer and testing
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# block relay to inbound peers.
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self.setup_nodes()
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for i in range(self.num_nodes-1):
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self.connect_nodes(i+1, i)
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def run_test(self):
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# Start building a chain on node0. node2 shouldn't be able to sync until node1's
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# minchainwork is exceeded
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starting_chain_work = REGTEST_WORK_PER_BLOCK # Genesis block's work
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self.log.info(f"Testing relay across node 1 (minChainWork = {self.node_min_work[1]})")
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starting_blockcount = self.nodes[2].getblockcount()
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num_blocks_to_generate = int((self.node_min_work[1] - starting_chain_work) / REGTEST_WORK_PER_BLOCK)
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self.log.info(f"Generating {num_blocks_to_generate} blocks on node0")
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hashes = self.generatetoaddress(self.nodes[0], num_blocks_to_generate,
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self.nodes[0].get_deterministic_priv_key().address)
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self.log.info(f"Node0 current chain work: {self.nodes[0].getblockheader(hashes[-1])['chainwork']}")
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# Sleep a few seconds and verify that node2 didn't get any new blocks
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# or headers. We sleep, rather than sync_blocks(node0, node1) because
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# it's reasonable either way for node1 to get the blocks, or not get
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# them (since they're below node1's minchainwork).
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time.sleep(3)
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self.log.info("Verifying node 2 has no more blocks than before")
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self.log.info(f"Blockcounts: {[n.getblockcount() for n in self.nodes]}")
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# Node2 shouldn't have any new headers yet, because node1 should not
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# have relayed anything.
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assert_equal(len(self.nodes[2].getchaintips()), 1)
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assert_equal(self.nodes[2].getchaintips()[0]['height'], 0)
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assert self.nodes[1].getbestblockhash() != self.nodes[0].getbestblockhash()
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assert_equal(self.nodes[2].getblockcount(), starting_blockcount)
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self.log.info("Generating one more block")
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self.generatetoaddress(self.nodes[0], 1, self.nodes[0].get_deterministic_priv_key().address)
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self.log.info("Verifying nodes are all synced")
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# Because nodes in regtest are all manual connections (eg using
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# addnode), node1 should not have disconnected node0. If not for that,
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# we'd expect node1 to have disconnected node0 for serving an
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# insufficient work chain, in which case we'd need to reconnect them to
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# continue the test.
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self.sync_all()
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self.log.info(f"Blockcounts: {[n.getblockcount() for n in self.nodes]}")
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if __name__ == '__main__':
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MinimumChainWorkTest().main()
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