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#!/usr/bin/env python3
# Copyright (c) 2015-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
# Test PreciousBlock code
#
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
connect_nodes_bi,
sync_chain,
sync_blocks,
)
def unidirectional_node_sync_via_rpc(node_src, node_dest):
blocks_to_copy = []
blockhash = node_src.getbestblockhash()
while True:
try:
assert(len(node_dest.getblock(blockhash, False)) > 0)
break
except:
blocks_to_copy.append(blockhash)
blockhash = node_src.getblockheader(blockhash, True)['previousblockhash']
blocks_to_copy.reverse()
for blockhash in blocks_to_copy:
blockdata = node_src.getblock(blockhash, False)
assert(node_dest.submitblock(blockdata) in (None, 'inconclusive'))
def node_sync_via_rpc(nodes):
for node_src in nodes:
for node_dest in nodes:
if node_src is node_dest:
continue
unidirectional_node_sync_via_rpc(node_src, node_dest)
class PreciousTest(BitcoinTestFramework):
def __init__(self):
super().__init__()
self.setup_clean_chain = True
self.num_nodes = 3
self.extra_args = [["-debug"]] * self.num_nodes
def setup_network(self):
self.nodes = self.setup_nodes()
def run_test(self):
print("Ensure submitblock can in principle reorg to a competing chain")
self.nodes[0].generate(1)
assert_equal(self.nodes[0].getblockcount(), 1)
(hashY, hashZ) = self.nodes[1].generate(2)
assert_equal(self.nodes[1].getblockcount(), 2)
node_sync_via_rpc(self.nodes[0:3])
assert_equal(self.nodes[0].getbestblockhash(), hashZ)
print("Mine blocks A-B-C on Node 0")
(hashA, hashB, hashC) = self.nodes[0].generate(3)
assert_equal(self.nodes[0].getblockcount(), 5)
print("Mine competing blocks E-F-G on Node 1")
(hashE, hashF, hashG) = self.nodes[1].generate(3)
assert_equal(self.nodes[1].getblockcount(), 5)
assert(hashC != hashG)
print("Connect nodes and check no reorg occurs")
# Submit competing blocks via RPC so any reorg should occur before we proceed (no way to wait on inaction for p2p sync)
node_sync_via_rpc(self.nodes[0:2])
connect_nodes_bi(self.nodes,0,1)
assert_equal(self.nodes[0].getbestblockhash(), hashC)
assert_equal(self.nodes[1].getbestblockhash(), hashG)
print("Make Node0 prefer block G")
self.nodes[0].preciousblock(hashG)
assert_equal(self.nodes[0].getbestblockhash(), hashG)
print("Make Node0 prefer block C again")
self.nodes[0].preciousblock(hashC)
assert_equal(self.nodes[0].getbestblockhash(), hashC)
print("Make Node1 prefer block C")
self.nodes[1].preciousblock(hashC)
sync_chain(self.nodes[0:2]) # wait because node 1 may not have downloaded hashC
assert_equal(self.nodes[1].getbestblockhash(), hashC)
print("Make Node1 prefer block G again")
self.nodes[1].preciousblock(hashG)
assert_equal(self.nodes[1].getbestblockhash(), hashG)
print("Make Node0 prefer block G again")
self.nodes[0].preciousblock(hashG)
assert_equal(self.nodes[0].getbestblockhash(), hashG)
print("Make Node1 prefer block C again")
self.nodes[1].preciousblock(hashC)
assert_equal(self.nodes[1].getbestblockhash(), hashC)
print("Mine another block (E-F-G-)H on Node 0 and reorg Node 1")
self.nodes[0].generate(1)
assert_equal(self.nodes[0].getblockcount(), 6)
sync_blocks(self.nodes[0:2])
hashH = self.nodes[0].getbestblockhash()
assert_equal(self.nodes[1].getbestblockhash(), hashH)
print("Node1 should not be able to prefer block C anymore")
self.nodes[1].preciousblock(hashC)
assert_equal(self.nodes[1].getbestblockhash(), hashH)
print("Mine competing blocks I-J-K-L on Node 2")
self.nodes[2].generate(4)
assert_equal(self.nodes[2].getblockcount(), 6)
hashL = self.nodes[2].getbestblockhash()
print("Connect nodes and check no reorg occurs")
node_sync_via_rpc(self.nodes[0:3])
connect_nodes_bi(self.nodes,1,2)
connect_nodes_bi(self.nodes,0,2)
assert_equal(self.nodes[0].getbestblockhash(), hashH)
assert_equal(self.nodes[1].getbestblockhash(), hashH)
assert_equal(self.nodes[2].getbestblockhash(), hashL)
print("Make Node1 prefer block L")
self.nodes[1].preciousblock(hashL)
assert_equal(self.nodes[1].getbestblockhash(), hashL)
print("Make Node2 prefer block H")
self.nodes[2].preciousblock(hashH)
assert_equal(self.nodes[2].getbestblockhash(), hashH)
if __name__ == '__main__':
PreciousTest().main()
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