110 lines
4.8 KiB
Python
Executable File
110 lines
4.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2014 The Bitcoin Core developers
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# Copyright (c) 2020 The Zcash developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or https://www.opensource.org/licenses/mit-license.php .
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"""
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Exercise the chain rewind code at the Blossom boundary.
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Test case is:
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3 nodes are initialized, two of which are aware of the Blossom network upgrade,
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and one of which is not. On each node, the chain is advanced to just prior to
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the Blossom activation; height then, the network is split and each branch of
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the network produces blocks into the range of the upgraded protocol.
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The node that is not aware of Blossom activation is advanced beyond the maximum
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reorg length of 99 blocks, then that node is shut down. When the node is
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restarted with knowledge of the network activation height the checks on startup
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identify a need to reorg to come into agreement with the rest of the network.
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However, since the rollback required is greater than the maximum reorg length,
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the node shuts down with an error as a precautionary measure. It was noticed in
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#4119 that the error message indicated an incorrect computation of the rollback
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length. This test reproduces that error, and the associated change in rollback
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length computation (40b5d5e3ea4b602c34c4efaba0b9f6171dddfef5) corrects the issue.
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"""
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (assert_equal, assert_true,
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assert_start_raises_init_error,
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start_nodes, start_node, connect_nodes_bi,
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bitcoind_processes,
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nuparams, OVERWINTER_BRANCH_ID, SAPLING_BRANCH_ID)
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import logging
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import sys
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logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.INFO, stream=sys.stdout)
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HAS_SAPLING = [nuparams(OVERWINTER_BRANCH_ID, 10), nuparams(SAPLING_BRANCH_ID, 15)]
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NO_SAPLING = [nuparams(OVERWINTER_BRANCH_ID, 10), nuparams(SAPLING_BRANCH_ID, 150)]
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class SaplingRewindTest(BitcoinTestFramework):
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def __init__(self):
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super().__init__()
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self.num_nodes = 3
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self.cache_behavior = 'clean'
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# This mirrors how the network was setup in the bash test
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def setup_network(self, split=False):
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logging.info("Initializing the network in "+self.options.tmpdir)
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self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args=[
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HAS_SAPLING, # The first two nodes have a correct view of the network,
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HAS_SAPLING, # the third will rewind after upgrading.
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NO_SAPLING
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])
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connect_nodes_bi(self.nodes,0,1)
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connect_nodes_bi(self.nodes,1,2)
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connect_nodes_bi(self.nodes,0,2)
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self.is_network_split=False
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self.sync_all()
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def run_test(self):
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# Generate shared state up to the network split
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logging.info("Generating initial blocks.")
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self.nodes[0].generate(13)
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block14 = self.nodes[0].generate(1)[0]
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logging.info("Syncing network after initial generation...")
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self.sync_all() # Everyone is still on overwinter
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logging.info("Checking overwinter block propagation.")
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assert_equal(self.nodes[0].getbestblockhash(), block14)
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assert_equal(self.nodes[1].getbestblockhash(), block14)
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assert_equal(self.nodes[2].getbestblockhash(), block14)
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logging.info("All nodes are on overwinter.")
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logging.info("Generating network split...")
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self.is_network_split=True
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# generate past the boundary into sapling; this will become the "canonical" branch
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self.nodes[0].generate(50)
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expected = self.nodes[0].getbestblockhash()
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# generate blocks into sapling beyond the maximum rewind length (99 blocks)
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self.nodes[2].generate(120)
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self.sync_all()
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assert_true(expected != self.nodes[2].getbestblockhash(), "Split chains have not diverged!")
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# Stop the overwinter node to ensure state is flushed to disk.
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logging.info("Shutting down lagging node...")
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self.nodes[2].stop()
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bitcoind_processes[2].wait()
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# Restart the nodes, reconnect, and sync the network. This succeeds if "-reindex" is passed.
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logging.info("Reconnecting the network...")
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# expect an exception; the node will refuse to fully start because its last point of
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# agreement with the rest of the network was prior to the network upgrade activation
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assert_start_raises_init_error(2, self.options.tmpdir, HAS_SAPLING, "roll back 120")
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# restart the node with -reindex to allow the test to complete gracefully,
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# otherwise the node shutdown call in test cleanup will throw an error since
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# it can't connect
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self.nodes[2] = start_node(2, self.options.tmpdir, extra_args=NO_SAPLING + ["-reindex"])
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if __name__ == '__main__':
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SaplingRewindTest().main()
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