Function test_update_fee_dynamic

tests/test_connection.py:2455–2502

(node_factory, bitcoind)

@pytest.mark.developer("needs dev-no-fake-fees")
def test_update_fee_dynamic(node_factory, bitcoind):
    # l1 has no fee estimates to start.
    l1 = node_factory.get_node(options={'log-level': 'io',
                                        'dev-no-fake-fees': True}, start=False)
    l1.daemon.rpcproxy.mock_rpc('estimatesmartfee', {
        'error': {"errors": ["Insufficient data or no feerate found"], "blocks": 0}
    })
    l1.start()
    l2 = node_factory.get_node()

    l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
    # Fails due to lack of fee estimate.
    with pytest.raises(RpcError, match='Cannot estimate fees'):
        l1.fundchannel(l2, 10**6)

    # Explicit feerate works.
    l1.fundchannel(l2, 10**6, feerate='10000perkw')

    l1.set_feerates((15000, 11000, 7500, 3750))

    # It will send UPDATE_FEE when it tries to send HTLC.
    inv = l2.rpc.invoice(5000, 'test_update_fee_dynamic', 'test_update_fee_dynamic')['bolt11']
    l1.rpc.pay(inv)

    l2.daemon.wait_for_log('peer_in.*UPDATE_FEE')

    # Now we take it away again!
    l1.daemon.rpcproxy.mock_rpc('estimatesmartfee', {
        'error': {"errors": ["Insufficient data or no feerate found"], "blocks": 0}
    })
    # Make sure that registers!  (DEVELOPER means polling every second)
    time.sleep(2)

    inv = l2.rpc.invoice(5000, 'test_update_fee_dynamic2', 'test_update_fee_dynamic2')['bolt11']
    l1.rpc.pay(inv)

    # Won't update fee.
    assert not l2.daemon.is_in_log('peer_in.*UPDATE_FEE',
                                   start=l2.daemon.logsearch_start)

    # Bring it back.
    l1.set_feerates((14000, 10000, 7000, 3000))

    # It will send UPDATE_FEE when it tries to send HTLC.
    inv = l2.rpc.invoice(5000, 'test_update_fee_dynamic3', 'test_update_fee_dynamic')['bolt11']
    l1.rpc.pay(inv)

    l2.daemon.wait_for_log('peer_in.*UPDATE_FEE')


@pytest.mark.developer