test/functional/preciousblock.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2015-2016 The Bitcoin Core developers
   3 # Distributed under the MIT software license, see the accompanying
   4 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5 """Test the preciousblock RPC."""
   6
   7 from test_framework.test_framework import BitcoinTestFramework
   8 from test_framework.util import (
   9     assert_equal,
  10     connect_nodes_bi,
  11     sync_chain,
  12     sync_blocks,
  13 )
  14
  15 def unidirectional_node_sync_via_rpc(node_src, node_dest):
  16     blocks_to_copy = []
  17     blockhash = node_src.getbestblockhash()
  18     while True:
  19         try:
  20             assert(len(node_dest.getblock(blockhash, False)) > 0)
  21             break
  22         except:
  23             blocks_to_copy.append(blockhash)
  24             blockhash = node_src.getblockheader(blockhash, True)['previousblockhash']
  25     blocks_to_copy.reverse()
  26     for blockhash in blocks_to_copy:
  27         blockdata = node_src.getblock(blockhash, False)
  28         assert(node_dest.submitblock(blockdata) in (None, 'inconclusive'))
  29
  30 def node_sync_via_rpc(nodes):
  31     for node_src in nodes:
  32         for node_dest in nodes:
  33             if node_src is node_dest:
  34                 continue
  35             unidirectional_node_sync_via_rpc(node_src, node_dest)
  36
  37 class PreciousTest(BitcoinTestFramework):
  38     def set_test_params(self):
  39         self.setup_clean_chain = True
  40         self.num_nodes = 3
  41
  42     def setup_network(self):
  43         self.setup_nodes()
  44
  45     def run_test(self):
  46         self.log.info("Ensure submitblock can in principle reorg to a competing chain")
  47         self.nodes[0].generate(1)
  48         assert_equal(self.nodes[0].getblockcount(), 1)
  49         hashZ = self.nodes[1].generate(2)[-1]
  50         assert_equal(self.nodes[1].getblockcount(), 2)
  51         node_sync_via_rpc(self.nodes[0:3])
  52         assert_equal(self.nodes[0].getbestblockhash(), hashZ)
  53
  54         self.log.info("Mine blocks A-B-C on Node 0")
  55         hashC = self.nodes[0].generate(3)[-1]
  56         assert_equal(self.nodes[0].getblockcount(), 5)
  57         self.log.info("Mine competing blocks E-F-G on Node 1")
  58         hashG = self.nodes[1].generate(3)[-1]
  59         assert_equal(self.nodes[1].getblockcount(), 5)
  60         assert(hashC != hashG)
  61         self.log.info("Connect nodes and check no reorg occurs")
  62         # Submit competing blocks via RPC so any reorg should occur before we proceed (no way to wait on inaction for p2p sync)
  63         node_sync_via_rpc(self.nodes[0:2])
  64         connect_nodes_bi(self.nodes,0,1)
  65         assert_equal(self.nodes[0].getbestblockhash(), hashC)
  66         assert_equal(self.nodes[1].getbestblockhash(), hashG)
  67         self.log.info("Make Node0 prefer block G")
  68         self.nodes[0].preciousblock(hashG)
  69         assert_equal(self.nodes[0].getbestblockhash(), hashG)
  70         self.log.info("Make Node0 prefer block C again")
  71         self.nodes[0].preciousblock(hashC)
  72         assert_equal(self.nodes[0].getbestblockhash(), hashC)
  73         self.log.info("Make Node1 prefer block C")
  74         self.nodes[1].preciousblock(hashC)
  75         sync_chain(self.nodes[0:2]) # wait because node 1 may not have downloaded hashC
  76         assert_equal(self.nodes[1].getbestblockhash(), hashC)
  77         self.log.info("Make Node1 prefer block G again")
  78         self.nodes[1].preciousblock(hashG)
  79         assert_equal(self.nodes[1].getbestblockhash(), hashG)
  80         self.log.info("Make Node0 prefer block G again")
  81         self.nodes[0].preciousblock(hashG)
  82         assert_equal(self.nodes[0].getbestblockhash(), hashG)
  83         self.log.info("Make Node1 prefer block C again")
  84         self.nodes[1].preciousblock(hashC)
  85         assert_equal(self.nodes[1].getbestblockhash(), hashC)
  86         self.log.info("Mine another block (E-F-G-)H on Node 0 and reorg Node 1")
  87         self.nodes[0].generate(1)
  88         assert_equal(self.nodes[0].getblockcount(), 6)
  89         sync_blocks(self.nodes[0:2])
  90         hashH = self.nodes[0].getbestblockhash()
  91         assert_equal(self.nodes[1].getbestblockhash(), hashH)
  92         self.log.info("Node1 should not be able to prefer block C anymore")
  93         self.nodes[1].preciousblock(hashC)
  94         assert_equal(self.nodes[1].getbestblockhash(), hashH)
  95         self.log.info("Mine competing blocks I-J-K-L on Node 2")
  96         self.nodes[2].generate(4)
  97         assert_equal(self.nodes[2].getblockcount(), 6)
  98         hashL = self.nodes[2].getbestblockhash()
  99         self.log.info("Connect nodes and check no reorg occurs")
 100         node_sync_via_rpc(self.nodes[1:3])
 101         connect_nodes_bi(self.nodes,1,2)
 102         connect_nodes_bi(self.nodes,0,2)
 103         assert_equal(self.nodes[0].getbestblockhash(), hashH)
 104         assert_equal(self.nodes[1].getbestblockhash(), hashH)
 105         assert_equal(self.nodes[2].getbestblockhash(), hashL)
 106         self.log.info("Make Node1 prefer block L")
 107         self.nodes[1].preciousblock(hashL)
 108         assert_equal(self.nodes[1].getbestblockhash(), hashL)
 109         self.log.info("Make Node2 prefer block H")
 110         self.nodes[2].preciousblock(hashH)
 111         assert_equal(self.nodes[2].getbestblockhash(), hashH)
 112
 113 if __name__ == '__main__':
 114     PreciousTest().main()