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#!/usr/bin/env python3
# Copyright (c) 2014-2021 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
def run_test(self):
wallet = MiniWallet(self.nodes[0])
# Invalidate two blocks, so that miniwallet has access to a coin that will mature in the next block
chain_height = 198
self.nodes[0].invalidateblock(self.nodes[0].getblockhash(chain_height + 1))
assert_equal(chain_height, self.nodes[0].getblockcount())
wallet.rescan_utxos()
# 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.
coinbase_txid = lambda h: self.nodes[0].getblock(self.nodes[0].getblockhash(h))['tx'][0]
utxo_mature = wallet.get_utxo(txid=coinbase_txid(chain_height - 100 + 1))
utxo_immature = wallet.get_utxo(txid=coinbase_txid(chain_height - 100 + 2))
spend_mature_id = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_mature)["txid"]
# other coinbase should be too immature to spend
immature_tx = wallet.create_self_transfer(utxo_to_spend=utxo_immature)
assert_raises_rpc_error(-26,
"bad-txns-premature-spend-of-coinbase",
lambda: self.nodes[0].sendrawtransaction(immature_tx['hex']))
# mempool should have just the mature one
assert_equal(self.nodes[0].getrawmempool(), [spend_mature_id])
# mine a block, mature one should get confirmed
self.generate(self.nodes[0], 1)
assert_equal(set(self.nodes[0].getrawmempool()), set())
# ... and now previously immature can be spent:
spend_new_id = self.nodes[0].sendrawtransaction(immature_tx['hex'])
assert_equal(self.nodes[0].getrawmempool(), [spend_new_id])
if __name__ == '__main__':
MempoolSpendCoinbaseTest().main()
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