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pytest: Add test for the block backfilling trigger by gossip

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This is just the test that we use to verify block backfilling below the wallet
birth height is working correctly.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2019-08-05 13:52:29 +02:00 committed by Rusty Russell
parent af0200f9d0
commit 5bb411b572
1 changed files with 58 additions and 0 deletions
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58
tests/test_db.py
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@ -1,4 +1,8 @@
from fixtures import * # noqa: F401,F403
from utils import wait_for
import pytest
def test_db_dangling_peer_fix(node_factory):
@ -15,3 +19,57 @@ def test_db_dangling_peer_fix(node_factory):
# Make sure l2 has register connection
l2.daemon.wait_for_log('Handed peer, entering loop')
l2.fund_channel(l1, 200000, wait_for_active=True)
@pytest.mark.xfail(strict=True)
def test_block_backfill(node_factory, bitcoind):
"""Test whether we backfill data from the blockchain correctly.
For normal operation we will process any block after the initial start
height, or rescan height, but for gossip we actually also need to backfill
the blocks we skipped initially. We do so on-demand, whenever we see a
channel_announcement referencing a blockheight we haven't processed yet,
we fetch the entire block, extract P2WSH outputs and ask `bitcoin
gettxout` for each of them. We then store the block header in the `blocks`
table and the unspent outputs in the `utxoset` table.
The test consist of two nodes opening a channel at height X, and an
unrelated P2WSH transaction being sent at the same height (will be used to
check for completeness of the backfill). Then a second node starts at
height X+100 and connect to one of the nodes. It should not have the block
in its DB before connecting. After connecting it should sync the gossip,
triggering a backfill of block X, and all associated P2WSH outputs.
"""
# Need to manually open the channels later since otherwise we can't have a
# tx in the same block (`line_graph` with `fundchannel=True` generates
# blocks).
l1, l2 = node_factory.line_graph(2, fundchannel=False)
# Get some funds to l1
addr = l1.rpc.newaddr()['bech32']
bitcoind.rpc.sendtoaddress(addr, 1)
wait_for(lambda: len(bitcoind.rpc.getrawmempool()) == 1)
bitcoind.generate_block(1)
l1.daemon.wait_for_log(r'Owning')
# Now send the needle we will go looking for later:
bitcoind.rpc.sendtoaddress('bcrt1qtwxd8wg5eanumk86vfeujvp48hfkgannf77evggzct048wggsrxsum2pmm', 1)
l1.rpc.fundchannel(l2.info['id'], 10**6, announce=True)
wait_for(lambda: len(bitcoind.rpc.getrawmempool()) == 2)
# Confirm and get some distance between the funding and the l3 wallet birth date
bitcoind.generate_block(100)
wait_for(lambda: len(l1.rpc.listnodes()['nodes']) == 2)
# Start the tester node, and connect it to l1. l0 should sync the gossip
# and call out to `bitcoind` to backfill the block.
l3 = node_factory.get_node()
heights = [r['height'] for r in l3.db_query("SELECT height FROM blocks")]
assert(103 not in heights)
l3.rpc.connect(l1.info['id'], 'localhost', l1.port)
wait_for(lambda: len(l3.rpc.listnodes()['nodes']) == 2)
heights = [r['height'] for r in l3.db_query("SELECT height FROM blocks")]
assert(103 in heights)