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from fixtures import * # noqa: F401,F403
from test_lightningd import wait_for
import os
import time
import unittest
DEVELOPER = os.getenv("DEVELOPER", "0") == "1"
@unittest.skipIf(not DEVELOPER, "needs DEVELOPER=1 for --dev-broadcast-interval")
def test_gossip_pruning(node_factory, bitcoind):
""" Create channel and see it being updated in time before pruning
"""
opts = {'channel-update-interval': 5}
l1, l2, l3 = node_factory.get_nodes(3, opts)
l1.rpc.connect(l2.info['id'], 'localhost', l2.info['port'])
l2.rpc.connect(l3.info['id'], 'localhost', l3.info['port'])
scid1 = l1.fund_channel(l2, 10**6)
scid2 = l2.fund_channel(l3, 10**6)
bitcoind.rpc.generate(6)
# Channels should be activated locally
wait_for(lambda: [c['active'] for c in l1.rpc.listchannels()['channels']] == [True] * 4)
wait_for(lambda: [c['active'] for c in l2.rpc.listchannels()['channels']] == [True] * 4)
wait_for(lambda: [c['active'] for c in l3.rpc.listchannels()['channels']] == [True] * 4)
# All of them should send a keepalive message
l1.daemon.wait_for_logs([
'Sending keepalive channel_update for {}'.format(scid1),
])
l2.daemon.wait_for_logs([
'Sending keepalive channel_update for {}'.format(scid1),
'Sending keepalive channel_update for {}'.format(scid2),
])
l3.daemon.wait_for_logs([
'Sending keepalive channel_update for {}'.format(scid2),
])
# Now kill l3, so that l2 and l1 can prune it from their view after 10 seconds
# FIXME: This sleep() masks a real bug: that channeld sends a
# channel_update message (to disable the channel) with same
# timestamp as the last keepalive, and thus is ignored. The minimal
# fix is to backdate the keepalives 1 second, but maybe we should
# simply have gossipd generate all updates?
time.sleep(1)
l3.stop()
l1.daemon.wait_for_log("Pruning channel {} from network view".format(scid2))
l2.daemon.wait_for_log("Pruning channel {} from network view".format(scid2))
assert scid2 not in [c['short_channel_id'] for c in l1.rpc.listchannels()['channels']]
assert scid2 not in [c['short_channel_id'] for c in l2.rpc.listchannels()['channels']]
assert l3.info['id'] not in [n['nodeid'] for n in l1.rpc.listnodes()['nodes']]
assert l3.info['id'] not in [n['nodeid'] for n in l2.rpc.listnodes()['nodes']]