Repository: bitcoin/bitcoin
File: test/functional/feature_bind_extra.py (Python)

Code before:
    p2p_port,
    rpc_port,
)


class BindExtraTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        # Avoid any -bind= on the command line. Force the framework to avoid
        # adding -bind=127.0.0.1.
        self.bind_to_localhost_only = False
        self.num_nodes = 3

    def skip_test_if_missing_module(self):
        # Due to OS-specific network stats queries, we only run on Linux.
        self.skip_if_platform_not_linux()

    def setup_network(self):
        loopback_ipv4 = addr_to_hex("127.0.0.1")

        # Start custom ports by reusing unused p2p ports
        port = p2p_port(self.num_nodes)

        # Array of tuples [command line arguments, expected bind addresses].
        self.expected = []

        # Node0, no normal -bind=... with -bind=...=onion, thus only the tor target.
        self.expected.append(
            [
                [f"-bind=127.0.0.1:{port}=onion"],
                [(loopback_ipv4, port)]
            ],
        )
        port += 1

        # Node1, both -bind=... and -bind=...=onion.
        self.expected.append(
            [
                [f"-bind=127.0.0.1:{port}", f"-bind=127.0.0.1:{port + 1}=onion"],
                [(loopback_ipv4, port), (loopback_ipv4, port + 1)]
            ],
        )
        port += 2

        # Node2, no -bind=...=onion, thus no extra port for Tor target.
        self.expected.append(
            [
                [f"-bind=127.0.0.1:{port}"],
                [(loopback_ipv4, port)]
            ],
        )

Review comment (suggestion):
If you apply the suggestion below, the patch above will work.
Is there a reason why the starting port index should be the same as the number of nodes?

```suggestion
        extra_port.index = 0
```

Code after:
    p2p_port,
    rpc_port,
)


class BindExtraTest(BitcoinTestFramework):
    def set_test_params(self):
        self.setup_clean_chain = True
        # Avoid any -bind= on the command line. Force the framework to avoid
        # adding -bind=127.0.0.1.
        self.bind_to_localhost_only = False
        self.num_nodes = 3

    def skip_test_if_missing_module(self):
        # Due to OS-specific network stats queries, we only run on Linux.
        self.skip_if_platform_not_linux()

    def setup_network(self):
        loopback_ipv4 = addr_to_hex("127.0.0.1")

        # Start custom ports by reusing unused p2p ports
        def extra_port():
            port = p2p_port(extra_port.index)
            extra_port.index += 1
            return port
        extra_port.index = self.num_nodes

        # Array of tuples [command line arguments, expected bind addresses].
        self.expected = []

        # Node0, no normal -bind=... with -bind=...=onion, thus only the tor target.
        port = extra_port()
        self.expected.append(
            [
                [f"-bind=127.0.0.1:{port}=onion"],
                [(loopback_ipv4, port)],
            ],
        )

        # Node1, both -bind=... and -bind=...=onion.
        port = [extra_port(), extra_port()]
        self.expected.append(
            [
                [f"-bind=127.0.0.1:{port[0]}", f"-bind=127.0.0.1:{port[1]}=onion"],
                [(loopback_ipv4, port[0]), (loopback_ipv4, port[1])],
            ],
        )

        # Node2, no -bind=...=onion, thus no extra port for Tor target.
        port = extra_port()
        self.expected.append(