core-lightning/tests/test_plugin.py

from collections import OrderedDict
from fixtures import *  # noqa: F401,F403
from flaky import flaky  # noqa: F401
from lightning import RpcError, Millisatoshi
from utils import only_one, wait_for

import os
import pytest
import sqlite3
import subprocess
import time


def test_option_passthrough(node_factory):
    """ Ensure that registering options works.

    First attempts without the plugin and then with the plugin.
    """
    plugin_path = 'contrib/plugins/helloworld.py'

    help_out = subprocess.check_output([
        'lightningd/lightningd',
        '--help'
    ]).decode('utf-8')
    assert('--greeting' not in help_out)

    help_out = subprocess.check_output([
        'lightningd/lightningd',
        '--plugin={}'.format(plugin_path),
        '--help'
    ]).decode('utf-8')
    assert('--greeting' in help_out)

    # Now try to see if it gets accepted, would fail to start if the
    # option didn't exist
    n = node_factory.get_node(options={'plugin': plugin_path, 'greeting': 'Ciao'})
    n.stop()


def test_millisatoshi_passthrough(node_factory):
    """ Ensure that Millisatoshi arguments and return work.
    """
    plugin_path = 'tests/plugins/millisatoshis.py'
    n = node_factory.get_node(options={'plugin': plugin_path, 'log-level': 'io'})

    # By keyword
    ret = n.rpc.call('echo', {'msat': Millisatoshi(17), 'not_an_msat': '22msat'})['echo_msat']
    assert type(ret) == Millisatoshi
    assert ret == Millisatoshi(17)

    # By position
    ret = n.rpc.call('echo', [Millisatoshi(18), '22msat'])['echo_msat']
    assert type(ret) == Millisatoshi
    assert ret == Millisatoshi(18)


def test_rpc_passthrough(node_factory):
    """Starting with a plugin exposes its RPC methods.

    First check that the RPC method appears in the help output and
    then try to call it.

    """
    plugin_path = 'contrib/plugins/helloworld.py'
    n = node_factory.get_node(options={'plugin': plugin_path, 'greeting': 'Ciao'})

    # Make sure that the 'hello' command that the helloworld.py plugin
    # has registered is available.
    cmd = [hlp for hlp in n.rpc.help()['help'] if 'hello' in hlp['command']]
    assert(len(cmd) == 1)

    # Make sure usage message is present.
    assert only_one(n.rpc.help('hello')['help'])['command'] == 'hello [name]'
    # While we're at it, let's check that helloworld.py is logging
    # correctly via the notifications plugin->lightningd
    assert n.daemon.is_in_log('Plugin helloworld.py initialized')

    # Now try to call it and see what it returns:
    greet = n.rpc.hello(name='World')
    assert(greet == "Ciao World")
    with pytest.raises(RpcError):
        n.rpc.fail()


def test_plugin_dir(node_factory):
    """--plugin-dir works"""
    plugin_dir = 'contrib/plugins'
    node_factory.get_node(options={'plugin-dir': plugin_dir, 'greeting': 'Mars'})


def test_plugin_disable(node_factory):
    """--disable-plugin works"""
    plugin_dir = 'contrib/plugins'
    # We need plugin-dir before disable-plugin!
    n = node_factory.get_node(options=OrderedDict([('plugin-dir', plugin_dir),
                                                   ('disable-plugin',
                                                    '{}/helloworld.py'
                                                    .format(plugin_dir))]))
    with pytest.raises(RpcError):
        n.rpc.hello(name='Sun')

    # Also works by basename.
    n = node_factory.get_node(options=OrderedDict([('plugin-dir', plugin_dir),
                                                   ('disable-plugin',
                                                    'helloworld.py')]))
    with pytest.raises(RpcError):
        n.rpc.hello(name='Sun')


def test_plugin_hook(node_factory, executor):
    """The helloworld plugin registers a htlc_accepted hook.

    The hook will sleep for a few seconds and log a
    message. `lightningd` should wait for the response and only then
    complete the payment.

    """
    l1, l2 = node_factory.line_graph(2, opts={'plugin': 'contrib/plugins/helloworld.py'})
    start_time = time.time()
    f = executor.submit(l1.pay, l2, 100000)
    l2.daemon.wait_for_log(r'on_htlc_accepted called')

    # The hook will sleep for 20 seconds before answering, so `f`
    # should take at least that long.
    f.result()
    end_time = time.time()
    assert(end_time >= start_time + 20)


def test_plugin_notifications(node_factory):
    l1, l2 = node_factory.get_nodes(2, opts={'plugin': 'contrib/plugins/helloworld.py'})

    l1.connect(l2)
    l1.daemon.wait_for_log(r'Received connect event')
    l2.daemon.wait_for_log(r'Received connect event')

    l2.rpc.disconnect(l1.info['id'])
    l1.daemon.wait_for_log(r'Received disconnect event')
    l2.daemon.wait_for_log(r'Received disconnect event')


def test_failing_plugins():
    fail_plugins = [
        'contrib/plugins/fail/failtimeout.py',
        'contrib/plugins/fail/doesnotexist.py',
    ]

    for p in fail_plugins:
        with pytest.raises(subprocess.CalledProcessError):
            subprocess.check_output([
                'lightningd/lightningd',
                '--plugin={}'.format(p),
                '--help',
            ])


def test_pay_plugin(node_factory):
    l1, l2 = node_factory.line_graph(2)
    inv = l2.rpc.invoice(123000, 'label', 'description', 3700)

    res = l1.rpc.pay(bolt11=inv['bolt11'])
    assert res['status'] == 'complete'

    with pytest.raises(RpcError, match=r'missing required parameter'):
        l1.rpc.call('pay')

    # Make sure usage messages are present.
    assert only_one(l1.rpc.help('pay')['help'])['command'] == 'pay bolt11 [msatoshi] [label] [riskfactor] [maxfeepercent] [retry_for] [maxdelay] [exemptfee]'
    assert only_one(l1.rpc.help('paystatus')['help'])['command'] == 'paystatus [bolt11]'


def test_plugin_connected_hook(node_factory):
    """ l1 uses the reject plugin to reject connections.

    l1 is configured to accept connections from l2, but not from l3.
    """
    opts = [{'plugin': 'tests/plugins/reject.py'}, {}, {}]
    l1, l2, l3 = node_factory.get_nodes(3, opts=opts)
    l1.rpc.reject(l3.info['id'])

    l2.connect(l1)
    l1.daemon.wait_for_log(r"{} is allowed".format(l2.info['id']))
    assert len(l1.rpc.listpeers(l2.info['id'])['peers']) == 1

    l3.connect(l1)
    l1.daemon.wait_for_log(r"{} is in reject list".format(l3.info['id']))

    # FIXME: this error occurs *after* connection, so we connect then drop.
    l3.daemon.wait_for_log(r"lightning_openingd-{} chan #1: peer_in WIRE_ERROR"
                           .format(l1.info['id']))
    l3.daemon.wait_for_log(r"You are in reject list")

    def check_disconnect():
        peers = l1.rpc.listpeers(l3.info['id'])['peers']
        return peers == [] or not peers[0]['connected']

    wait_for(check_disconnect)


def test_async_rpcmethod(node_factory, executor):
    """This tests the async rpcmethods.

    It works in conjunction with the `asynctest` plugin which stashes
    requests and then resolves all of them on the fifth call.
    """
    l1 = node_factory.get_node(options={'plugin': 'tests/plugins/asynctest.py'})

    results = []
    for i in range(10):
        results.append(executor.submit(l1.rpc.asyncqueue))

    time.sleep(3)

    # None of these should have returned yet
    assert len([r for r in results if r.done()]) == 0

    # This last one triggers the release and all results should be 42,
    # since the last number is returned for all
    l1.rpc.asyncflush(42)

    assert [r.result() for r in results] == [42] * len(results)


def test_db_hook(node_factory, executor):
    """This tests the db hook."""
    dbfile = os.path.join(node_factory.directory, "dblog.sqlite3")
    l1 = node_factory.get_node(options={'plugin': 'tests/plugins/dblog.py',
                                        'dblog-file': dbfile})

    # It should see the db being created, and sometime later actually get
    # initted.
    # This precedes startup, so needle already past
    assert l1.daemon.is_in_log('plugin-dblog.py deferring 1 commands')
    l1.daemon.logsearch_start = 0
    l1.daemon.wait_for_log('plugin-dblog.py replaying pre-init data:')
    l1.daemon.wait_for_log('plugin-dblog.py PRAGMA foreign_keys = ON;')
    l1.daemon.wait_for_log('plugin-dblog.py CREATE TABLE version \\(version INTEGER\\)')
    l1.daemon.wait_for_log('plugin-dblog.py initialized')

    l1.stop()

    # Databases should be identical.
    db1 = sqlite3.connect(os.path.join(l1.daemon.lightning_dir, 'lightningd.sqlite3'))
    db2 = sqlite3.connect(dbfile)

    assert [x for x in db1.iterdump()] == [x for x in db2.iterdump()]


def test_utf8_passthrough(node_factory, executor):
    l1 = node_factory.get_node(options={'plugin': 'tests/plugins/utf8.py',
                                        'log-level': 'io'})

    # This works because Python unmangles.
    res = l1.rpc.call('utf8', ['ナンセンス 1杯'])
    assert '\\u' not in res['utf8']
    assert res['utf8'] == 'ナンセンス 1杯'

    # Now, try native.
    out = subprocess.check_output(['cli/lightning-cli',
                                   '--lightning-dir={}'
                                   .format(l1.daemon.lightning_dir),
                                   'utf8', 'ナンセンス 1杯']).decode('utf-8')
    assert '\\u' not in out
    assert out == '{\n   "utf8" : "ナンセンス 1杯"\n}\n'


def test_invoice_payment_hook(node_factory):
    """ l1 uses the reject-payment plugin to reject invoices with odd preimages.
    """
    opts = [{}, {'plugin': 'tests/plugins/reject_some_invoices.py'}]
    l1, l2 = node_factory.line_graph(2, opts=opts)

    # This one works
    inv1 = l2.rpc.invoice(123000, 'label', 'description', preimage='1' * 64)
    l1.rpc.pay(inv1['bolt11'])

    l2.daemon.wait_for_log('label=label')
    l2.daemon.wait_for_log('msat=')
    l2.daemon.wait_for_log('preimage=' + '1' * 64)

    # This one will be rejected.
    inv2 = l2.rpc.invoice(123000, 'label2', 'description', preimage='0' * 64)
    with pytest.raises(RpcError):
        l1.rpc.pay(inv2['bolt11'])

    pstatus = l1.rpc.call('paystatus', [inv2['bolt11']])['pay'][0]
    assert pstatus['attempts'][0]['failure']['data']['failcodename'] == 'WIRE_TEMPORARY_NODE_FAILURE'

    l2.daemon.wait_for_log('label=label2')
    l2.daemon.wait_for_log('msat=')
    l2.daemon.wait_for_log('preimage=' + '0' * 64)


def test_openchannel_hook(node_factory, bitcoind):
    """ l2 uses the reject_odd_funding_amounts plugin to reject some openings.
    """
    opts = [{}, {'plugin': 'tests/plugins/reject_odd_funding_amounts.py'}]
    l1, l2 = node_factory.line_graph(2, fundchannel=False, opts=opts)

    # Get some funds.
    addr = l1.rpc.newaddr()['bech32']
    txid = bitcoind.rpc.sendtoaddress(addr, 10)
    numfunds = len(l1.rpc.listfunds()['outputs'])
    bitcoind.generate_block(1, txid)
    wait_for(lambda: len(l1.rpc.listfunds()['outputs']) > numfunds)

    # Even amount: works.
    l1.rpc.fundchannel(l2.info['id'], 100000)

    # Make sure plugin got all the vars we expect
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py 11 VARS')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py channel_flags=1')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py channel_reserve_satoshis=1000000msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py dust_limit_satoshis=546000msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py feerate_per_kw=7500')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py funding_satoshis=100000000msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py htlc_minimum_msat=0msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py id={}'.format(l1.info['id']))
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py max_accepted_htlcs=483')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py max_htlc_value_in_flight_msat=18446744073709551615msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py push_msat=0msat')
    l2.daemon.wait_for_log('reject_odd_funding_amounts.py to_self_delay=5')

    # Close it.
    txid = l1.rpc.close(l2.info['id'])['txid']
    bitcoind.generate_block(1, txid)
    wait_for(lambda: [c['state'] for c in only_one(l1.rpc.listpeers(l2.info['id'])['peers'])['channels']] == ['ONCHAIN'])

    # Odd amount: fails
    l1.connect(l2)
    with pytest.raises(RpcError, match=r"I don't like odd amounts"):
        l1.rpc.fundchannel(l2.info['id'], 100001)


def test_htlc_accepted_hook_fail(node_factory):
    """Send payments from l1 to l2, but l2 just declines everything.

    l2 is configured with a plugin that'll hook into htlc_accepted and
    always return failures. The same should also work for forwarded
    htlcs in the second half.

    """
    l1, l2, l3 = node_factory.line_graph(3, opts=[
        {},
        {'plugin': 'tests/plugins/fail_htlcs.py'},
        {}
    ], wait_for_announce=True)

    # This must fail
    inv = l2.rpc.invoice(1000, "lbl", "desc")['bolt11']
    with pytest.raises(RpcError) as excinfo:
        l1.rpc.pay(inv)
    assert excinfo.value.error['data']['failcode'] == 16399
    assert excinfo.value.error['data']['erring_index'] == 1

    # And the invoice must still be unpaid
    inv = l2.rpc.listinvoices("lbl")['invoices']
    assert len(inv) == 1 and inv[0]['status'] == 'unpaid'

    # Now try with forwarded HTLCs: l2 should still fail them
    # This must fail
    inv = l3.rpc.invoice(1000, "lbl", "desc")['bolt11']
    with pytest.raises(RpcError) as excinfo:
        l1.rpc.pay(inv)

    # And the invoice must still be unpaid
    inv = l3.rpc.listinvoices("lbl")['invoices']
    assert len(inv) == 1 and inv[0]['status'] == 'unpaid'


def test_htlc_accepted_hook_resolve(node_factory):
    """l3 creates an invoice, l2 knows the preimage and will shortcircuit.
    """
    l1, l2, l3 = node_factory.line_graph(3, opts=[
        {},
        {'plugin': 'tests/plugins/shortcircuit.py'},
        {}
    ], wait_for_announce=True)

    inv = l3.rpc.invoice(msatoshi=1000, label="lbl", description="desc", preimage="00" * 32)['bolt11']
    l1.rpc.pay(inv)

    # And the invoice must still be unpaid
    inv = l3.rpc.listinvoices("lbl")['invoices']
    assert len(inv) == 1 and inv[0]['status'] == 'unpaid'


def test_htlc_accepted_hook_direct_restart(node_factory, executor):
    """l2 restarts while it is pondering what to do with an HTLC.
    """
    l1, l2 = node_factory.line_graph(2, opts=[
        {'may_reconnect': True},
        {'may_reconnect': True, 'plugin': 'tests/plugins/hold_htlcs.py'}
    ])

    i1 = l2.rpc.invoice(msatoshi=1000, label="direct", description="desc")['bolt11']
    f1 = executor.submit(l1.rpc.pay, i1)

    l2.daemon.wait_for_log(r'Holding onto an incoming htlc for 10 seconds')
    l2.restart()

    f1.result()


def test_htlc_accepted_hook_forward_restart(node_factory, executor):
    """l2 restarts while it is pondering what to do with an HTLC.
    """
    l1, l2, l3 = node_factory.line_graph(3, opts=[
        {'may_reconnect': True},
        {'may_reconnect': True, 'plugin': 'tests/plugins/hold_htlcs.py'},
        {'may_reconnect': True},
    ], wait_for_announce=True)

    i1 = l3.rpc.invoice(msatoshi=1000, label="direct", description="desc")['bolt11']
    f1 = executor.submit(l1.rpc.pay, i1)

    l2.daemon.wait_for_log(r'Holding onto an incoming htlc for 10 seconds')
    l2.restart()

    f1.result()