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138 lines
5.7 KiB
138 lines
5.7 KiB
#!/usr/bin/env python3
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# Copyright (c) 2019-2020 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 node eviction logic
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When the number of peers has reached the limit of maximum connections,
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the next connecting inbound peer will trigger the eviction mechanism.
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We cannot currently test the parts of the eviction logic that are based on
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address/netgroup since in the current framework, all peers are connecting from
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the same local address. See Issue #14210 for more info.
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Therefore, this test is limited to the remaining protection criteria.
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"""
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import time
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from test_framework.blocktools import (
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COINBASE_MATURITY,
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create_block,
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create_coinbase,
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)
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from test_framework.messages import (
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msg_pong,
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msg_tx,
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tx_from_hex,
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)
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from test_framework.p2p import P2PDataStore, P2PInterface
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal
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class SlowP2PDataStore(P2PDataStore):
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def on_ping(self, message):
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time.sleep(0.1)
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self.send_message(msg_pong(message.nonce))
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class SlowP2PInterface(P2PInterface):
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def on_ping(self, message):
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time.sleep(0.1)
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self.send_message(msg_pong(message.nonce))
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class P2PEvict(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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# The choice of maxconnections=32 results in a maximum of 21 inbound connections
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# (32 - 10 outbound - 1 feeler). 20 inbound peers are protected from eviction:
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# 4 by netgroup, 4 that sent us blocks, 4 that sent us transactions and 8 via lowest ping time
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self.extra_args = [['-maxconnections=32']]
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def run_test(self):
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protected_peers = set() # peers that we expect to be protected from eviction
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current_peer = -1
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node = self.nodes[0]
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self.generatetoaddress(node, COINBASE_MATURITY + 1, node.get_deterministic_priv_key().address)
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self.log.info("Create 4 peers and protect them from eviction by sending us a block")
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for _ in range(4):
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block_peer = node.add_p2p_connection(SlowP2PDataStore())
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current_peer += 1
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block_peer.sync_with_ping()
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best_block = node.getbestblockhash()
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tip = int(best_block, 16)
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best_block_time = node.getblock(best_block)['time']
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block = create_block(tip, create_coinbase(node.getblockcount() + 1), best_block_time + 1)
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block.solve()
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block_peer.send_blocks_and_test([block], node, success=True)
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protected_peers.add(current_peer)
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self.log.info("Create 5 slow-pinging peers, making them eviction candidates")
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for _ in range(5):
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node.add_p2p_connection(SlowP2PInterface())
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current_peer += 1
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self.log.info("Create 4 peers and protect them from eviction by sending us a tx")
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for i in range(4):
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txpeer = node.add_p2p_connection(SlowP2PInterface())
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current_peer += 1
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txpeer.sync_with_ping()
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prevtx = node.getblock(node.getblockhash(i + 1), 2)['tx'][0]
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rawtx = node.createrawtransaction(
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inputs=[{'txid': prevtx['txid'], 'vout': 0}],
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outputs=[{node.get_deterministic_priv_key().address: 50 - 0.00125}],
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)
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sigtx = node.signrawtransactionwithkey(
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hexstring=rawtx,
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privkeys=[node.get_deterministic_priv_key().key],
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prevtxs=[{
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'txid': prevtx['txid'],
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'vout': 0,
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'scriptPubKey': prevtx['vout'][0]['scriptPubKey']['hex'],
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}],
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)['hex']
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txpeer.send_message(msg_tx(tx_from_hex(sigtx)))
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protected_peers.add(current_peer)
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self.log.info("Create 8 peers and protect them from eviction by having faster pings")
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for _ in range(8):
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fastpeer = node.add_p2p_connection(P2PInterface())
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current_peer += 1
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self.wait_until(lambda: "ping" in fastpeer.last_message, timeout=10)
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# Make sure by asking the node what the actual min pings are
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peerinfo = node.getpeerinfo()
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pings = {}
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for i in range(len(peerinfo)):
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pings[i] = peerinfo[i]['minping'] if 'minping' in peerinfo[i] else 1000000
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sorted_pings = sorted(pings.items(), key=lambda x: x[1])
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# Usually the 8 fast peers are protected. In rare case of unreliable pings,
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# one of the slower peers might have a faster min ping though.
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for i in range(8):
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protected_peers.add(sorted_pings[i][0])
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self.log.info("Create peer that triggers the eviction mechanism")
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node.add_p2p_connection(SlowP2PInterface())
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# One of the non-protected peers must be evicted. We can't be sure which one because
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# 4 peers are protected via netgroup, which is identical for all peers,
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# and the eviction mechanism doesn't preserve the order of identical elements.
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evicted_peers = []
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for i in range(len(node.p2ps)):
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if not node.p2ps[i].is_connected:
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evicted_peers.append(i)
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self.log.info("Test that one peer was evicted")
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self.log.debug("{} evicted peer: {}".format(len(evicted_peers), set(evicted_peers)))
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assert_equal(len(evicted_peers), 1)
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self.log.info("Test that no peer expected to be protected was evicted")
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self.log.debug("{} protected peers: {}".format(len(protected_peers), protected_peers))
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assert evicted_peers[0] not in protected_peers
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if __name__ == '__main__':
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P2PEvict().main()
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