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#!/usr/bin/env python3
# Copyright (c) 2014-2020 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 assert_equal, assert_raises_rpc_error
from test_framework.wallet import MiniWallet
class MempoolSpendCoinbaseTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.setup_clean_chain = True
def run_test(self):
wallet = MiniWallet(self.nodes[0])
wallet.generate(200)
chain_height = self.nodes[0].getblockcount()
assert_equal(chain_height, 200)
# Coinbase at height chain_height-100+1 ok in mempool, should
# get mined. Coinbase at height chain_height-100+2 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]
utxo_101 = wallet.get_utxo(txid=coinbase_txids[0])
utxo_102 = wallet.get_utxo(txid=coinbase_txids[1])
spend_101_id = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_101)["txid"]
# coinbase at height 102 should be too immature to spend
assert_raises_rpc_error(-26,
"bad-txns-premature-spend-of-coinbase",
lambda: wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_102))
# 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 = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_102)["txid"]
assert_equal(self.nodes[0].getrawmempool(), [spend_102_id])
if __name__ == '__main__':
MempoolSpendCoinbaseTest().main()
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