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#!/usr/bin/env python2
# Copyright (c) 2014 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 spending coinbase transactions.
# The coinbase transaction in block N can appear in block
# N+100... so is valid in the mempool when the best block
# height is N+99.
# This test makes sure coinbase spends that will be mature
# in the next block are accepted into the memory pool,
# but less mature coinbase spends are NOT.
#
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import *
import os
import shutil
# Create one-input, one-output, no-fee transaction:
class MempoolSpendCoinbaseTest(BitcoinTestFramework):
def setup_network(self):
# Just need one node for this test
args = ["-checkmempool", "-debug=mempool"]
self.nodes = []
self.nodes.append(start_node(0, self.options.tmpdir, args))
self.is_network_split = False
def create_tx(self, from_txid, to_address, amount):
inputs = [{ "txid" : from_txid, "vout" : 0}]
outputs = { to_address : amount }
rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
signresult = self.nodes[0].signrawtransaction(rawtx)
assert_equal(signresult["complete"], True)
return signresult["hex"]
def run_test(self):
chain_height = self.nodes[0].getblockcount()
assert_equal(chain_height, 200)
node0_address = self.nodes[0].getnewaddress()
# Coinbase at height chain_height-100+1 ok in mempool, should
# get mined. Coinbase at height chain_height-100+2 is
# is too immature to spend.
b = [ self.nodes[0].getblockhash(n) for n in range(101, 103) ]
coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
spends_raw = [ self.create_tx(txid, node0_address, 50) for txid in coinbase_txids ]
spend_101_id = self.nodes[0].sendrawtransaction(spends_raw[0])
# coinbase at height 102 should be too immature to spend
assert_raises(JSONRPCException, self.nodes[0].sendrawtransaction, spends_raw[1])
# mempool should have just spend_101:
assert_equal(self.nodes[0].getrawmempool(), [ spend_101_id ])
# mine a block, spend_101 should get confirmed
self.nodes[0].generate(1)
assert_equal(set(self.nodes[0].getrawmempool()), set())
# ... and now height 102 can be spent:
spend_102_id = self.nodes[0].sendrawtransaction(spends_raw[1])
assert_equal(self.nodes[0].getrawmempool(), [ spend_102_id ])
if __name__ == '__main__':
MempoolSpendCoinbaseTest().main()
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