#!/usr/bin/env python3
# Copyright (c) 2020 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 addr relay
"""

from test_framework.messages import (
    CAddress,
    NODE_NETWORK,
    NODE_WITNESS,
    msg_addr,
)
from test_framework.p2p import P2PInterface
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
)
import time


class AddrReceiver(P2PInterface):
    num_ipv4_received = 0

    def on_addr(self, message):
        for addr in message.addrs:
            assert_equal(addr.nServices, 9)
            if not 8333 <= addr.port < 8343:
                raise AssertionError("Invalid addr.port of {} (8333-8342 expected)".format(addr.port))
            assert addr.ip.startswith('123.123.123.')
            self.num_ipv4_received += 1


class AddrTest(BitcoinTestFramework):
    counter = 0
    mocktime = int(time.time())

    def set_test_params(self):
        self.num_nodes = 1

    def run_test(self):
        self.oversized_addr_test()
        self.relay_tests()

    def setup_addr_msg(self, num):
        addrs = []
        for i in range(num):
            addr = CAddress()
            addr.time = self.mocktime + i
            addr.nServices = NODE_NETWORK | NODE_WITNESS
            addr.ip = f"123.123.123.{self.counter % 256}"
            addr.port = 8333 + i
            addrs.append(addr)
            self.counter += 1

        msg = msg_addr()
        msg.addrs = addrs
        return msg

    def oversized_addr_test(self):
        self.log.info('Send an addr message that is too large')
        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())

        msg = self.setup_addr_msg(1010)
        with self.nodes[0].assert_debug_log(['addr message size = 1010']):
            addr_source.send_and_ping(msg)

        self.nodes[0].disconnect_p2ps()

    def relay_tests(self):
        self.log.info('Check that addr message content is relayed and added to addrman')
        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())
        num_receivers = 7
        receivers = []
        for _ in range(num_receivers):
            receivers.append(self.nodes[0].add_p2p_connection(AddrReceiver()))

        # Keep this with length <= 10. Addresses from larger messages are not
        # relayed.
        num_ipv4_addrs = 10
        msg = self.setup_addr_msg(num_ipv4_addrs)
        with self.nodes[0].assert_debug_log(
            [
                'Added {} addresses from 127.0.0.1: 0 tried'.format(num_ipv4_addrs),
                'received: addr (301 bytes) peer=1',
            ]
        ):
            addr_source.send_and_ping(msg)
            self.mocktime += 30 * 60
            self.nodes[0].setmocktime(self.mocktime)
            for receiver in receivers:
                receiver.sync_with_ping()

        total_ipv4_received = sum(r.num_ipv4_received for r in receivers)

        # Every IPv4 address must be relayed to two peers, other than the
        # originating node (addr_source).
        ipv4_branching_factor = 2
        assert_equal(total_ipv4_received, num_ipv4_addrs * ipv4_branching_factor)

        self.nodes[0].disconnect_p2ps()


if __name__ == '__main__':
    AddrTest().main()