Function test_pay_limits

tests/test_pay.py:109–139

Test that we enforce fee max percentage and max delay

(node_factory)

def test_pay_limits(node_factory):
    """Test that we enforce fee max percentage and max delay"""
    l1, l2, l3 = node_factory.line_graph(3, wait_for_announce=True)

    # FIXME: pylightning should define this!
    PAY_ROUTE_TOO_EXPENSIVE = 206

    inv = l3.rpc.invoice("any", "any", 'description')

    # Fee too high.
    err = r'Could not find route without excessive cost'
    with pytest.raises(RpcError, match=err) as err:
        l1.rpc.call('xpay', {'invstring': inv['bolt11'], 'amount_msat': 100000, 'maxfee': 1})

    assert err.value.error['code'] == PAY_ROUTE_TOO_EXPENSIVE

    failmsg = r'Could not find route without excessive delays'
    # Delay too high.
    with pytest.raises(RpcError, match=failmsg) as err:
        l1.rpc.call('xpay', {'invstring': inv['bolt11'], 'amount_msat': 100000, 'maxdelay': 0})

    assert err.value.error['code'] == PAY_ROUTE_TOO_EXPENSIVE

    # This fails!
    err = r'Could not find route without excessive cost'
    with pytest.raises(RpcError, match=err) as err:
        l1.rpc.xpay(invstring=inv['bolt11'], amount_msat=100000, maxfee=1)

    # This works, because fee is less than exemptfee.
    l1.dev_pay(inv['bolt11'], amount_msat=100000, maxfeepercent=0.0001,
               exemptfee=2000, dev_use_shadow=False)


def test_pay_maxdelay_direct_channel(node_factory):