test/functional/mining.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 mining RPCs
   6
   7 - getblocktemplate proposal mode
   8 - submitblock"""
   9
  10 from binascii import b2a_hex
  11 import copy
  12
  13 from test_framework.blocktools import create_coinbase
  14 from test_framework.test_framework import BitcoinTestFramework
  15 from test_framework.mininode import CBlock
  16 from test_framework.util import *
  17
  18 def b2x(b):
  19     return b2a_hex(b).decode('ascii')
  20
  21 def assert_template(node, block, expect, rehash=True):
  22     if rehash:
  23         block.hashMerkleRoot = block.calc_merkle_root()
  24     rsp = node.getblocktemplate({'data': b2x(block.serialize()), 'mode': 'proposal'})
  25     assert_equal(rsp, expect)
  26
  27 class MiningTest(BitcoinTestFramework):
  28     def set_test_params(self):
  29         self.num_nodes = 2
  30         self.setup_clean_chain = False
  31
  32     def run_test(self):
  33         node = self.nodes[0]
  34         # Mine a block to leave initial block download
  35         node.generate(1)
  36         tmpl = node.getblocktemplate()
  37         self.log.info("getblocktemplate: Test capability advertised")
  38         assert 'proposal' in tmpl['capabilities']
  39         assert 'coinbasetxn' not in tmpl
  40
  41         coinbase_tx = create_coinbase(height=int(tmpl["height"]) + 1)
  42         # sequence numbers must not be max for nLockTime to have effect
  43         coinbase_tx.vin[0].nSequence = 2 ** 32 - 2
  44         coinbase_tx.rehash()
  45
  46         block = CBlock()
  47         block.nVersion = tmpl["version"]
  48         block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
  49         block.nTime = tmpl["curtime"]
  50         block.nBits = int(tmpl["bits"], 16)
  51         block.nNonce = 0
  52         block.vtx = [coinbase_tx]
  53
  54         self.log.info("getblocktemplate: Test valid block")
  55         assert_template(node, block, None)
  56
  57         self.log.info("submitblock: Test block decode failure")
  58         assert_raises_jsonrpc(-22, "Block decode failed", node.submitblock, b2x(block.serialize()[:-15]))
  59
  60         self.log.info("getblocktemplate: Test bad input hash for coinbase transaction")
  61         bad_block = copy.deepcopy(block)
  62         bad_block.vtx[0].vin[0].prevout.hash += 1
  63         bad_block.vtx[0].rehash()
  64         assert_template(node, bad_block, 'bad-cb-missing')
  65
  66         self.log.info("submitblock: Test invalid coinbase transaction")
  67         assert_raises_jsonrpc(-22, "Block does not start with a coinbase", node.submitblock, b2x(bad_block.serialize()))
  68
  69         self.log.info("getblocktemplate: Test truncated final transaction")
  70         assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(block.serialize()[:-1]), 'mode': 'proposal'})
  71
  72         self.log.info("getblocktemplate: Test duplicate transaction")
  73         bad_block = copy.deepcopy(block)
  74         bad_block.vtx.append(bad_block.vtx[0])
  75         assert_template(node, bad_block, 'bad-txns-duplicate')
  76
  77         self.log.info("getblocktemplate: Test invalid transaction")
  78         bad_block = copy.deepcopy(block)
  79         bad_tx = copy.deepcopy(bad_block.vtx[0])
  80         bad_tx.vin[0].prevout.hash = 255
  81         bad_tx.rehash()
  82         bad_block.vtx.append(bad_tx)
  83         assert_template(node, bad_block, 'bad-txns-inputs-missingorspent')
  84
  85         self.log.info("getblocktemplate: Test nonfinal transaction")
  86         bad_block = copy.deepcopy(block)
  87         bad_block.vtx[0].nLockTime = 2 ** 32 - 1
  88         bad_block.vtx[0].rehash()
  89         assert_template(node, bad_block, 'bad-txns-nonfinal')
  90
  91         self.log.info("getblocktemplate: Test bad tx count")
  92         # The tx count is immediately after the block header
  93         TX_COUNT_OFFSET = 80
  94         bad_block_sn = bytearray(block.serialize())
  95         assert_equal(bad_block_sn[TX_COUNT_OFFSET], 1)
  96         bad_block_sn[TX_COUNT_OFFSET] += 1
  97         assert_raises_jsonrpc(-22, "Block decode failed", node.getblocktemplate, {'data': b2x(bad_block_sn), 'mode': 'proposal'})
  98
  99         self.log.info("getblocktemplate: Test bad bits")
 100         bad_block = copy.deepcopy(block)
 101         bad_block.nBits = 469762303  # impossible in the real world
 102         assert_template(node, bad_block, 'bad-diffbits')
 103
 104         self.log.info("getblocktemplate: Test bad merkle root")
 105         bad_block = copy.deepcopy(block)
 106         bad_block.hashMerkleRoot += 1
 107         assert_template(node, bad_block, 'bad-txnmrklroot', False)
 108
 109         self.log.info("getblocktemplate: Test bad timestamps")
 110         bad_block = copy.deepcopy(block)
 111         bad_block.nTime = 2 ** 31 - 1
 112         assert_template(node, bad_block, 'time-too-new')
 113         bad_block.nTime = 0
 114         assert_template(node, bad_block, 'time-too-old')
 115
 116         self.log.info("getblocktemplate: Test not best block")
 117         bad_block = copy.deepcopy(block)
 118         bad_block.hashPrevBlock = 123
 119         assert_template(node, bad_block, 'inconclusive-not-best-prevblk')
 120
 121 if __name__ == '__main__':
 122     MiningTest().main()