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#!/usr/bin/env python3
# Copyright (c) 2021 The Discoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Fee limit QA test.
# Tests nodes under fee limit, verifies fee rounding
"""
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import *
from decimal import Decimal
class FeeLimitTest(BitcoinTestFramework):
def __init__(self):
super().__init__()
self.setup_clean_chain = True
self.num_nodes = 2
def setup_network(self, split=False):
self.nodes = []
self.nodes.append(start_node(0, self.options.tmpdir, []))
self.nodes.append(start_node(1, self.options.tmpdir, []))
connect_nodes_bi(self.nodes,0,1)
self.is_network_split=False
self.sync_all()
def run_test(self):
# mine some blocks
self.nodes[0].generate(101)
self.sync_all()
# Output address
addr_to = self.nodes[1].getnewaddress()
lower_fee_per_kb = Decimal("0.001")
# Force generating a transaction with 1.14.5-like fees by manually building the tx
utx = self.nodes[0].listunspent()[0]
inputs = [ {'txid' : utx['txid'], 'vout' : utx['vout']}]
outputs = { addr_to : utx['amount'] - Decimal("1.0") }
rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
# Work out how big this transaction would be, then change the output to match
tx_size = count_bytes(self.nodes[0].signrawtransaction(rawtx)['hex'])
fee = lower_fee_per_kb * (tx_size + 1) / Decimal("1000")
outputs = { addr_to : utx['amount'] - fee }
rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
signedtx = self.nodes[0].signrawtransaction(rawtx)
self.nodes[0].sendrawtransaction(signedtx["hex"])
# Sync all of the nodes
self.sync_all()
# Check if the TX made it to node 2
assert_equal(self.nodes[1].getmempoolinfo()['size'], 1)
assert_equal(self.nodes[0].getmempoolinfo()['size'], 1)
# Force generating a transaction with fees which are too low to relay
too_low_fee = lower_fee_per_kb * (tx_size - 4) / Decimal("1000")
utx = self.nodes[0].listunspent()[0]
inputs = [ {'txid' : utx['txid'], 'vout' : utx['vout']}]
outputs = { self.nodes[1].getnewaddress() : utx['amount'] - too_low_fee }
rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
signedtx = self.nodes[0].signrawtransaction(rawtx)
self.nodes[0].sendrawtransaction(signedtx["hex"])
# wait 10 seconds to sync mempools
time.sleep(10)
# Check the TX did not relay, so is only on node 0
assert_equal(self.nodes[1].getmempoolinfo()['size'], 1)
assert_equal(self.nodes[0].getmempoolinfo()['size'], 2)
if __name__ == '__main__':
FeeLimitTest().main()
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