bitcoin/test/functional/p2p_dns_seeds.py
Amiti Uttarwar 75c05af361 [test] Test logic to query DNS seeds with block-relay-only connections
When a node is able to properly shutdown, it will persist its block-relay-only
connections to the addrman. On startup, it will attempt to reconnect to these
anchors. Since block-relay-only connections do not participate in ADDR relay,
succesful connections are insufficient to skip querying the DNS seeds.

This test fails prior to the changes in #22013.

Co-authored-by: Martin Zumsande <mzumsande@gmail.com>
2021-07-30 11:15:49 -07:00

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Python
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#!/usr/bin/env python3
# Copyright (c) 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 ThreadDNSAddressSeed logic for querying DNS seeds."""
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
class P2PDNSSeeds(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
self.extra_args = [["-dnsseed=1"]]
def run_test(self):
self.existing_outbound_connections_test()
self.existing_block_relay_connections_test()
def existing_outbound_connections_test(self):
# Make sure addrman is populated to enter the conditional where we
# delay and potentially skip DNS seeding.
self.nodes[0].addpeeraddress("192.0.0.8", 8333)
self.log.info("Check that we *do not* query DNS seeds if we have 2 outbound connections")
self.restart_node(0)
with self.nodes[0].assert_debug_log(expected_msgs=["P2P peers available. Skipped DNS seeding."], timeout=12):
for i in range(2):
self.nodes[0].add_outbound_p2p_connection(P2PInterface(), p2p_idx=i, connection_type="outbound-full-relay")
def existing_block_relay_connections_test(self):
# Make sure addrman is populated to enter the conditional where we
# delay and potentially skip DNS seeding. No-op when run after
# existing_outbound_connections_test.
self.nodes[0].addpeeraddress("192.0.0.8", 8333)
self.log.info("Check that we *do* query DNS seeds if we only have 2 block-relay-only connections")
self.restart_node(0)
with self.nodes[0].assert_debug_log(expected_msgs=["Loading addresses from DNS seed"], timeout=12):
# This mimics the "anchors" logic where nodes are likely to
# reconnect to block-relay-only connections on startup.
# Since we do not participate in addr relay with these connections,
# we still want to query the DNS seeds.
for i in range(2):
self.nodes[0].add_outbound_p2p_connection(P2PInterface(), p2p_idx=i, connection_type="block-relay-only")
if __name__ == '__main__':
P2PDNSSeeds().main()