diff options
Diffstat (limited to 'test')
| -rwxr-xr-x | test/functional/minchainwork.py | 81 | ||||
| -rwxr-xr-x | test/functional/test_runner.py | 1 |
2 files changed, 82 insertions, 0 deletions
diff --git a/test/functional/minchainwork.py b/test/functional/minchainwork.py new file mode 100755 index 0000000000..c7579d2548 --- /dev/null +++ b/test/functional/minchainwork.py @@ -0,0 +1,81 @@ +#!/usr/bin/env python3 +# Copyright (c) 2017 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 logic for setting nMinimumChainWork on command line. + +Nodes don't consider themselves out of "initial block download" until +their active chain has more work than nMinimumChainWork. + +Nodes don't download blocks from a peer unless the peer's best known block +has more work than nMinimumChainWork. + +While in initial block download, nodes won't relay blocks to their peers, so +test that this parameter functions as intended by verifying that block relay +only succeeds past a given node once its nMinimumChainWork has been exceeded. +""" + +import time + +from test_framework.test_framework import BitcoinTestFramework +from test_framework.util import sync_blocks, connect_nodes, assert_equal + +# 2 hashes required per regtest block (with no difficulty adjustment) +REGTEST_WORK_PER_BLOCK = 2 + +class MinimumChainWorkTest(BitcoinTestFramework): + def set_test_params(self): + self.setup_clean_chain = True + self.num_nodes = 3 + self.extra_args = [[], ["-minimumchainwork=0x65"], ["-minimumchainwork=0x65"]] + self.node_min_work = [0, 101, 101] + + def setup_network(self): + # This test relies on the chain setup being: + # node0 <- node1 <- node2 + # Before leaving IBD, nodes prefer to download blocks from outbound + # peers, so ensure that we're mining on an outbound peer and testing + # block relay to inbound peers. + self.setup_nodes() + for i in range(self.num_nodes-1): + connect_nodes(self.nodes[i+1], i) + + def run_test(self): + # Start building a chain on node0. node2 shouldn't be able to sync until node1's + # minchainwork is exceeded + starting_chain_work = REGTEST_WORK_PER_BLOCK # Genesis block's work + self.log.info("Testing relay across node %d (minChainWork = %d)", 1, self.node_min_work[1]) + + starting_blockcount = self.nodes[2].getblockcount() + + num_blocks_to_generate = int((self.node_min_work[1] - starting_chain_work) / REGTEST_WORK_PER_BLOCK) + self.log.info("Generating %d blocks on node0", num_blocks_to_generate) + hashes = self.nodes[0].generate(num_blocks_to_generate) + + self.log.info("Node0 current chain work: %s", self.nodes[0].getblockheader(hashes[-1])['chainwork']) + + # Sleep a few seconds and verify that node2 didn't get any new blocks + # or headers. We sleep, rather than sync_blocks(node0, node1) because + # it's reasonable either way for node1 to get the blocks, or not get + # them (since they're below node1's minchainwork). + time.sleep(3) + + self.log.info("Verifying node 2 has no more blocks than before") + self.log.info("Blockcounts: %s", [n.getblockcount() for n in self.nodes]) + # Node2 shouldn't have any new headers yet, because node1 should not + # have relayed anything. + assert_equal(len(self.nodes[2].getchaintips()), 1) + assert_equal(self.nodes[2].getchaintips()[0]['height'], 0) + + assert self.nodes[1].getbestblockhash() != self.nodes[0].getbestblockhash() + assert_equal(self.nodes[2].getblockcount(), starting_blockcount) + + self.log.info("Generating one more block") + self.nodes[0].generate(1) + + self.log.info("Verifying nodes are all synced") + self.sync_all() + self.log.info("Blockcounts: %s", [n.getblockcount() for n in self.nodes]) + +if __name__ == '__main__': + MinimumChainWorkTest().main() diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py index fae4f66d70..714a907ee8 100755 --- a/test/functional/test_runner.py +++ b/test/functional/test_runner.py @@ -121,6 +121,7 @@ BASE_SCRIPTS= [ 'bip65-cltv-p2p.py', 'uptime.py', 'resendwallettransactions.py', + 'minchainwork.py', ] EXTENDED_SCRIPTS = [ |