Function test_fees_dont_exceed_constraints

tests/test_askrene.py:1187–1216

(node_factory)

def test_fees_dont_exceed_constraints(node_factory):
    msat = 100000000
    max_msat = int(msat * 0.45)
    # 0 has to use two paths (1 and 2) to reach 3.  But we tell it 0->1 has limited capacity.
    gsfile, nodemap = generate_gossip_store([GenChannel(0, 1, capacity_sats=msat // 1000, forward=GenChannel.Half(propfee=10000)),
                                             GenChannel(0, 2, capacity_sats=msat // 1000, forward=GenChannel.Half(propfee=10000)),
                                             GenChannel(1, 3, capacity_sats=msat // 1000, forward=GenChannel.Half(propfee=10000)),
                                             GenChannel(2, 3, capacity_sats=msat // 1000, forward=GenChannel.Half(propfee=10000))])

    # Set up l1 with this as the gossip_store
    l1 = node_factory.get_node(gossip_store_file=gsfile.name)

    chan = only_one([c for c in l1.rpc.listchannels(source=nodemap[0])['channels'] if c['destination'] == nodemap[1]])
    l1.rpc.askrene_create_layer('test_layers')
    l1.rpc.askrene_inform_channel(layer='test_layers',
                                  short_channel_id_dir=f"{chan['short_channel_id']}/{chan['direction']}",
                                  amount_msat=max_msat + 1,
                                  inform='constrained')

    routes = l1.rpc.getroutes(source=nodemap[0],
                              destination=nodemap[3],
                              amount_msat=msat,
                              layers=['test_layers'],
                              maxfee_msat=msat,
                              final_cltv=99)['routes']
    assert len(routes) == 2
    for hop in routes[0]['path'] + routes[1]['path']:
        if hop['short_channel_id_dir'] == f"{chan['short_channel_id']}/{chan['direction']}":
            amount = hop['amount_in_msat']
    assert amount <= max_msat


def test_sourcefree_on_mods(node_factory, bitcoind):