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#!/usr/bin/env python3
# Copyright (c) 2014-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
# Exercise the getchaintips API. We introduce a network split, work
# on chains of different lengths, and join the network together again.
# This gives us two tips, verify that it works.
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import assert_equal
class GetChainTipsTest (BitcoinTestFramework):
def __init__(self):
super().__init__()
self.num_nodes = 4
self.setup_clean_chain = False
def run_test (self):
tips = self.nodes[0].getchaintips ()
assert_equal (len (tips), 1)
assert_equal (tips[0]['branchlen'], 0)
assert_equal (tips[0]['height'], 200)
assert_equal (tips[0]['status'], 'active')
# Split the network and build two chains of different lengths.
self.split_network ()
self.nodes[0].generate(10)
self.nodes[2].generate(20)
self.sync_all ()
tips = self.nodes[1].getchaintips ()
assert_equal (len (tips), 1)
shortTip = tips[0]
assert_equal (shortTip['branchlen'], 0)
assert_equal (shortTip['height'], 210)
assert_equal (tips[0]['status'], 'active')
tips = self.nodes[3].getchaintips ()
assert_equal (len (tips), 1)
longTip = tips[0]
assert_equal (longTip['branchlen'], 0)
assert_equal (longTip['height'], 220)
assert_equal (tips[0]['status'], 'active')
# Join the network halves and check that we now have two tips
# (at least at the nodes that previously had the short chain).
self.join_network ()
tips = self.nodes[0].getchaintips ()
assert_equal (len (tips), 2)
assert_equal (tips[0], longTip)
assert_equal (tips[1]['branchlen'], 10)
assert_equal (tips[1]['status'], 'valid-fork')
tips[1]['branchlen'] = 0
tips[1]['status'] = 'active'
assert_equal (tips[1], shortTip)
if __name__ == '__main__':
GetChainTipsTest ().main ()