test/functional/getblocktemplate_proposals.py

   1 #!/usr/bin/env python3
   2 # Copyright (c) 2014-2016 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 block proposals with getblocktemplate."""
   6
   7 from binascii import b2a_hex
   8 import copy
   9
  10 from test_framework.blocktools import create_coinbase
  11 from test_framework.test_framework import BitcoinTestFramework
  12 from test_framework.mininode import CBlock
  13 from test_framework.util import *
  14
  15 def b2x(b):
  16     return b2a_hex(b).decode('ascii')
  17
  18 def assert_template(node, block, expect, rehash=True):
  19     if rehash:
  20         block.hashMerkleRoot = block.calc_merkle_root()
  21     rsp = node.getblocktemplate({'data': b2x(block.serialize()), 'mode': 'proposal'})
  22     assert_equal(rsp, expect)
  23
  24 class GetBlockTemplateProposalTest(BitcoinTestFramework):
  25
  26     def __init__(self):
  27         super().__init__()
  28         self.num_nodes = 2
  29         self.setup_clean_chain = False
  30
  31     def run_test(self):
  32         node = self.nodes[0]
  33         # Mine a block to leave initial block download
  34         node.generate(1)
  35         tmpl = node.getblocktemplate()
  36         self.log.info("getblocktemplate: Test capability advertised")
  37         assert 'proposal' in tmpl['capabilities']
  38         assert 'coinbasetxn' not in tmpl
  39
  40         coinbase_tx = create_coinbase(height=int(tmpl["height"]) + 1)
  41         # sequence numbers must not be max for nLockTime to have effect
  42         coinbase_tx.vin[0].nSequence = 2 ** 32 - 2
  43         coinbase_tx.rehash()
  44
  45         block = CBlock()
  46         block.nVersion = tmpl["version"]
  47         block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
  48         block.nTime = tmpl["curtime"]
  49         block.nBits = int(tmpl["bits"], 16)
  50         block.nNonce = 0
  51         block.vtx = [coinbase_tx]
  52
  53         self.log.info("getblocktemplate: Test bad input hash for coinbase transaction")
  54         bad_block = copy.deepcopy(block)
  55         bad_block.vtx[0].vin[0].prevout.hash += 1
  56         bad_block.vtx[0].rehash()
  57         assert_template(node, bad_block, 'bad-cb-missing')
  58
  59
  60         self.log.info("getblocktemplate: Test truncated final transaction")
  61         assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(block.serialize()[:-1]), 'mode': 'proposal'})
  62
  63         self.log.info("getblocktemplate: Test duplicate transaction")
  64         bad_block = copy.deepcopy(block)
  65         bad_block.vtx.append(bad_block.vtx[0])
  66         assert_template(node, bad_block, 'bad-txns-duplicate')
  67
  68         self.log.info("getblocktemplate: Test invalid transaction")
  69         bad_block = copy.deepcopy(block)
  70         bad_tx = copy.deepcopy(bad_block.vtx[0])
  71         bad_tx.vin[0].prevout.hash = 255
  72         bad_tx.rehash()
  73         bad_block.vtx.append(bad_tx)
  74         assert_template(node, bad_block, 'bad-txns-inputs-missingorspent')
  75
  76         self.log.info("getblocktemplate: Test nonfinal transaction")
  77         bad_block = copy.deepcopy(block)
  78         bad_block.vtx[0].nLockTime = 2 ** 32 - 1
  79         bad_block.vtx[0].rehash()
  80         assert_template(node, bad_block, 'bad-txns-nonfinal')
  81
  82         self.log.info("getblocktemplate: Test bad tx count")
  83         # The tx count is immediately after the block header
  84         TX_COUNT_OFFSET = 80
  85         bad_block_sn = bytearray(block.serialize())
  86         assert_equal(bad_block_sn[TX_COUNT_OFFSET], 1)
  87         bad_block_sn[TX_COUNT_OFFSET] += 1
  88         assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(bad_block_sn), 'mode': 'proposal'})
  89
  90         self.log.info("getblocktemplate: Test bad bits")
  91         bad_block = copy.deepcopy(block)
  92         bad_block.nBits = 469762303  # impossible in the real world
  93         assert_template(node, bad_block, 'bad-diffbits')
  94
  95         self.log.info("getblocktemplate: Test bad merkle root")
  96         bad_block = copy.deepcopy(block)
  97         bad_block.hashMerkleRoot += 1
  98         assert_template(node, bad_block, 'bad-txnmrklroot', False)
  99
 100         self.log.info("getblocktemplate: Test bad timestamps")
 101         bad_block = copy.deepcopy(block)
 102         bad_block.nTime = 2 ** 31 - 1
 103         assert_template(node, bad_block, 'time-too-new')
 104         bad_block.nTime = 0
 105         assert_template(node, bad_block, 'time-too-old')
 106
 107         self.log.info("getblocktemplate: Test valid block")
 108         assert_template(node, block, None)
 109
 110         self.log.info("getblocktemplate: Test not best block")
 111         bad_block = copy.deepcopy(block)
 112         bad_block.hashPrevBlock = 123
 113         assert_template(node, bad_block, 'inconclusive-not-best-prevblk')
 114
 115 if __name__ == '__main__':
 116     GetBlockTemplateProposalTest().main()