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106 lines
3.6 KiB
Python
Executable File
106 lines
3.6 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2022 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test initial headers download
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Test that we only try to initially sync headers from one peer (until our chain
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is close to caught up), and that each block announcement results in only one
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additional peer receiving a getheaders message.
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"""
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.messages import (
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CInv,
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MSG_BLOCK,
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msg_headers,
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msg_inv,
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)
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from test_framework.p2p import (
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p2p_lock,
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P2PInterface,
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)
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from test_framework.util import (
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assert_equal,
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)
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import random
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class HeadersSyncTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 1
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def announce_random_block(self, peers):
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new_block_announcement = msg_inv(inv=[CInv(MSG_BLOCK, random.randrange(1<<256))])
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for p in peers:
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p.send_and_ping(new_block_announcement)
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def run_test(self):
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self.log.info("Adding a peer to node0")
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peer1 = self.nodes[0].add_p2p_connection(P2PInterface())
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# Wait for peer1 to receive a getheaders
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peer1.wait_for_getheaders()
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# An empty reply will clear the outstanding getheaders request,
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# allowing additional getheaders requests to be sent to this peer in
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# the future.
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peer1.send_message(msg_headers())
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self.log.info("Connecting two more peers to node0")
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# Connect 2 more peers; they should not receive a getheaders yet
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peer2 = self.nodes[0].add_p2p_connection(P2PInterface())
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peer3 = self.nodes[0].add_p2p_connection(P2PInterface())
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all_peers = [peer1, peer2, peer3]
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self.log.info("Verify that peer2 and peer3 don't receive a getheaders after connecting")
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for p in all_peers:
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p.sync_with_ping()
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with p2p_lock:
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assert "getheaders" not in peer2.last_message
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assert "getheaders" not in peer3.last_message
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with p2p_lock:
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peer1.last_message.pop("getheaders", None)
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self.log.info("Have all peers announce a new block")
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self.announce_random_block(all_peers)
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self.log.info("Check that peer1 receives a getheaders in response")
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peer1.wait_for_getheaders()
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peer1.send_message(msg_headers()) # Send empty response, see above
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with p2p_lock:
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peer1.last_message.pop("getheaders", None)
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self.log.info("Check that exactly 1 of {peer2, peer3} received a getheaders in response")
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count = 0
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peer_receiving_getheaders = None
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for p in [peer2, peer3]:
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with p2p_lock:
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if "getheaders" in p.last_message:
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count += 1
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peer_receiving_getheaders = p
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p.last_message.pop("getheaders", None)
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p.send_message(msg_headers()) # Send empty response, see above
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assert_equal(count, 1)
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self.log.info("Announce another new block, from all peers")
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self.announce_random_block(all_peers)
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self.log.info("Check that peer1 receives a getheaders in response")
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peer1.wait_for_getheaders()
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self.log.info("Check that the remaining peer received a getheaders as well")
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expected_peer = peer2
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if peer2 == peer_receiving_getheaders:
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expected_peer = peer3
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expected_peer.wait_for_getheaders()
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self.log.info("Success!")
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if __name__ == '__main__':
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HeadersSyncTest().main()
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