bkpr: add bookkeeping assertions to splice in + out tests

Make sure that the fees and channel balances for splice ins and outs
work as expected.

Note this is for a single-sided splice.
Changelog-None: Tests!

Author: niftynei

tests/test_splice.py

@@ -1,69 +1,197 @@
 from fixtures import *  # noqa: F401,F403
+from pathlib import Path
+from pyln.client import Millisatoshi
 import pytest
 import unittest
 from utils import (
+    bkpr_account_balance, check_coin_moves, first_channel_id,
     TEST_NETWORK, only_one, wait_for
 )
 
 
 @pytest.mark.openchannel('v1')
 @pytest.mark.openchannel('v2')
 @unittest.skipIf(TEST_NETWORK != 'regtest', 'elementsd doesnt yet support PSBT features we need')
-def test_script_splice_out(node_factory, bitcoind):
-    l1, l2 = node_factory.line_graph(2, fundamount=1000000, wait_for_announce=True, opts={'experimental-splicing': None})
+def test_script_splice_out(node_factory, bitcoind, chainparams):
+    fundamt = 1000000
+
+    coin_mvt_plugin = Path(__file__).parent / "plugins" / "coin_movements.py"
+    l1, l2 = node_factory.line_graph(2, fundamount=fundamt, wait_for_announce=True,
+                                     opts={'experimental-splicing': None,
+                                           'plugin': coin_mvt_plugin})
+
+    initial_wallet_balance = Millisatoshi(bkpr_account_balance(l1, 'wallet'))
+    initial_channel_balance = Millisatoshi(bkpr_account_balance(l1, first_channel_id(l1, l2)))
+    assert initial_channel_balance == Millisatoshi(fundamt * 1000)
+
     # Splice out 100k from first channel, explicitly putting result less fees into onchain wallet
-    l1.rpc.splice("*:? -> 100000; 100%-fee -> wallet", force_feerate=True, debug_log=True)
+    spliceamt = 100000
+    l1.rpc.splice(f"*:? -> {spliceamt}; 100%-fee -> wallet", force_feerate=True, debug_log=True)
     p1 = only_one(l1.rpc.listpeerchannels(peer_id=l2.info['id'])['channels'])
     p2 = only_one(l2.rpc.listpeerchannels(l1.info['id'])['channels'])
-    assert p1['inflight'][0]['splice_amount'] == -100000
-    assert p1['inflight'][0]['total_funding_msat'] == 900000000
-    assert p1['inflight'][0]['our_funding_msat'] == 1000000000
+
+    assert p1['inflight'][0]['splice_amount'] == -1 * spliceamt
+    assert p1['inflight'][0]['total_funding_msat'] == (fundamt - spliceamt) * 1000
+    assert p1['inflight'][0]['our_funding_msat'] == fundamt * 1000
     assert p2['inflight'][0]['splice_amount'] == 0
-    assert p2['inflight'][0]['total_funding_msat'] == 900000000
+    assert p2['inflight'][0]['total_funding_msat'] == (fundamt - spliceamt) * 1000
     assert p2['inflight'][0]['our_funding_msat'] == 0
     bitcoind.generate_block(6, wait_for_mempool=1)
     l2.daemon.wait_for_log(r'lightningd, splice_locked clearing inflights')
 
     p1 = only_one(l1.rpc.listpeerchannels(peer_id=l2.info['id'])['channels'])
     p2 = only_one(l2.rpc.listpeerchannels(l1.info['id'])['channels'])
-    assert p1['to_us_msat'] == 900000000
-    assert p1['total_msat'] == 900000000
+    assert p1['to_us_msat'] == (fundamt - spliceamt) * 1000
+    assert p1['total_msat'] == (fundamt - spliceamt) * 1000
     assert p2['to_us_msat'] == 0
-    assert p2['total_msat'] == 900000000
+    assert p2['total_msat'] == (fundamt - spliceamt) * 1000
     assert 'inflight' not in p1
     assert 'inflight' not in p2
 
     wait_for(lambda: len(l1.rpc.listfunds()['outputs']) == 2)
     wait_for(lambda: len(l1.rpc.listfunds()['channels']) == 1)
 
+    # At the end we'd expect the balance of channel 1 to be down by the splice amount
+    end_channel_balance = Millisatoshi(bkpr_account_balance(l1, first_channel_id(l1, l2)))
+    end_wallet_balance = Millisatoshi(bkpr_account_balance(l1, 'wallet'))
+    assert initial_channel_balance - Millisatoshi(spliceamt * 1000) == end_channel_balance
+
+    # The fee is assumed to be the difference between the start+end balances?
+    fee_guess = initial_wallet_balance + initial_channel_balance - end_channel_balance - end_wallet_balance
+
+    # We'd expect the following coin movements
+    starting_wallet_msat = 2000000000
+    expected_wallet_moves = [
+        #  initial deposit
+        {'type': 'chain_mvt', 'credit_msat': starting_wallet_msat, 'debit_msat': 0, 'tags': ['deposit']},
+        #  channel open spend
+        {'type': 'chain_mvt', 'credit_msat': 0, 'debit_msat': starting_wallet_msat, 'tags': ['withdrawal']},
+        #  channel open change
+        {'type': 'chain_mvt', 'credit_msat': initial_wallet_balance, 'debit_msat': 0, 'tags': ['deposit']},
+        #  deposit of spliceamt - fees
+        {'type': 'chain_mvt', 'credit_msat': Millisatoshi(spliceamt * 1000) - fee_guess, 'debit_msat': 0, 'tags': ['deposit']},
+    ]
+
+    check_coin_moves(l1, 'wallet', expected_wallet_moves, chainparams)
+    expected_channel_moves = [
+        # channel_open  [utxo created], chain_mvt   (fundamt - spliceamt)
+        {'type': 'chain_mvt', 'credit_msat': fundamt * 1000, 'debit_msat': 0, 'tags': ['channel_open', 'opener']},
+        # channel_close [utxo spend], chain_mvt     (fundamt)
+        {'type': 'chain_mvt', 'debit_msat': fundamt * 1000, 'credit_msat': 0, 'tags': ['channel_close', 'splice']},
+        # channel_open  [utxo created], chain_mvt   (fundamt - spliceamt)
+        {'type': 'chain_mvt', 'credit_msat': (fundamt - spliceamt) * 1000, 'debit_msat': 0, 'tags': ['channel_open', 'opener']},
+    ]
+    check_coin_moves(l1, first_channel_id(l1, l2), expected_channel_moves, chainparams)
+
+    # Make sure the channel isn't marked as closed in bookkeeper
+    account_id = first_channel_id(l1, l2)
+    account_info = only_one([acct for acct in l1.rpc.bkpr_listbalances()['accounts'] if acct['account'] == account_id])
+    assert not account_info['account_closed']
+
+    # We'd also expect the wallet to be up by splice amt - fees
+    onchain_fees = [fee for fee in l1.rpc.bkpr_listincome()['income_events'] if fee['tag'] == 'onchain_fee']
+    assert len(onchain_fees) == 2
+    total_fees = sum([x['debit_msat'] for x in onchain_fees])
+    assert starting_wallet_msat == end_wallet_balance + total_fees + end_channel_balance
+
+    # Now close the channel and check that everything resolves as expected
+    l1.rpc.close(l2.info['id'])
+    l1.wait_for_channel_onchain(l2.info['id'])
+    account_info = only_one([acct for acct in l1.rpc.bkpr_listbalances()['accounts'] if acct['account'] == account_id])
+    assert not account_info['account_closed']
+
 
 @pytest.mark.openchannel('v1')
 @pytest.mark.openchannel('v2')
 @unittest.skipIf(TEST_NETWORK != 'regtest', 'elementsd doesnt yet support PSBT features we need')
-def test_script_splice_in(node_factory, bitcoind):
-    l1, l2 = node_factory.line_graph(2, fundamount=1000000, wait_for_announce=True, opts={'experimental-splicing': None})
+def test_script_splice_in(node_factory, bitcoind, chainparams):
+    fundamt = 1000000
+
+    coin_mvt_plugin = Path(__file__).parent / "plugins" / "coin_movements.py"
+    l1, l2 = node_factory.line_graph(2, fundamount=fundamt, wait_for_announce=True,
+                                     opts={'experimental-splicing': None,
+                                           'plugin': coin_mvt_plugin})
+
+    initial_wallet_balance = Millisatoshi(bkpr_account_balance(l1, 'wallet'))
+    initial_channel_balance = Millisatoshi(bkpr_account_balance(l1, first_channel_id(l1, l2)))
+    assert initial_channel_balance == Millisatoshi(fundamt * 1000)
+
     # Splice in 100k sats into first channel, explicitly taking out 200k sats from wallet
     # and letting change go automatically back to wallet (100k less onchain fees)
-    l1.rpc.splice("wallet -> 200000; 100000 -> *:?", force_feerate=True, debug_log=True)
+    spliceamt = 100000
+    withdraw_amt = 200000
+    starting_wallet_msat = withdraw_amt * 10000
+
+    l1.rpc.splice(f"wallet -> {withdraw_amt}; {spliceamt} -> *:?", force_feerate=True, debug_log=True)
     p1 = only_one(l1.rpc.listpeerchannels(peer_id=l2.info['id'])['channels'])
     p2 = only_one(l2.rpc.listpeerchannels(l1.info['id'])['channels'])
-    assert p1['inflight'][0]['splice_amount'] == 100000
-    assert p1['inflight'][0]['total_funding_msat'] == 1100000000
-    assert p1['inflight'][0]['our_funding_msat'] == 1000000000
+    assert p1['inflight'][0]['splice_amount'] == spliceamt
+    assert p1['inflight'][0]['total_funding_msat'] == (fundamt + spliceamt) * 1000
+    assert p1['inflight'][0]['our_funding_msat'] == fundamt * 1000
     assert p2['inflight'][0]['splice_amount'] == 0
-    assert p2['inflight'][0]['total_funding_msat'] == 1100000000
+    assert p2['inflight'][0]['total_funding_msat'] == (fundamt + spliceamt) * 1000
     assert p2['inflight'][0]['our_funding_msat'] == 0
     bitcoind.generate_block(6, wait_for_mempool=1)
     l2.daemon.wait_for_log(r'lightningd, splice_locked clearing inflights')
 
     p1 = only_one(l1.rpc.listpeerchannels(peer_id=l2.info['id'])['channels'])
     p2 = only_one(l2.rpc.listpeerchannels(l1.info['id'])['channels'])
-    assert p1['to_us_msat'] == 1100000000
-    assert p1['total_msat'] == 1100000000
+    assert p1['to_us_msat'] == (fundamt + spliceamt) * 1000
+    assert p1['total_msat'] == (fundamt + spliceamt) * 1000
     assert p2['to_us_msat'] == 0
-    assert p2['total_msat'] == 1100000000
+    assert p2['total_msat'] == (fundamt + spliceamt) * 1000
     assert 'inflight' not in p1
     assert 'inflight' not in p2
 
     wait_for(lambda: len(l1.rpc.listfunds()['outputs']) == 1)
     wait_for(lambda: len(l1.rpc.listfunds()['channels']) == 1)
+
+    # At the end we'd expect the balance of channel 1 to be up by the splice amount
+    end_channel_balance = Millisatoshi(bkpr_account_balance(l1, first_channel_id(l1, l2)))
+    end_wallet_balance = Millisatoshi(bkpr_account_balance(l1, 'wallet'))
+    assert initial_channel_balance + Millisatoshi(spliceamt * 1000) == end_channel_balance
+
+    # The fee is assumed to be the difference between the start+end balances?
+    fee_guess = initial_wallet_balance + initial_channel_balance - end_channel_balance - end_wallet_balance
+
+    # We'd expect the following coin movements
+    expected_wallet_moves = [
+        #  initial deposit
+        {'type': 'chain_mvt', 'credit_msat': starting_wallet_msat, 'debit_msat': 0, 'tags': ['deposit']},
+        #  channel open spend
+        {'type': 'chain_mvt', 'credit_msat': 0, 'debit_msat': starting_wallet_msat, 'tags': ['withdrawal']},
+        #  channel open change
+        {'type': 'chain_mvt', 'credit_msat': initial_wallet_balance, 'debit_msat': 0, 'tags': ['deposit']},
+        # splice-in spend
+        {'type': 'chain_mvt', 'debit_msat': initial_wallet_balance, 'credit_msat': 0, 'tags': ['withdrawal']},
+        #  post-splice deposit
+        {'type': 'chain_mvt', 'credit_msat': initial_wallet_balance - Millisatoshi(spliceamt * 1000) - fee_guess, 'debit_msat': 0, 'tags': ['deposit']},
+    ]
+
+    check_coin_moves(l1, 'wallet', expected_wallet_moves, chainparams)
+    expected_channel_moves = [
+        # channel_open  [utxo created], chain_mvt
+        {'type': 'chain_mvt', 'credit_msat': fundamt * 1000, 'debit_msat': 0, 'tags': ['channel_open', 'opener']},
+        # channel_close [utxo spend], chain_mvt     (fundamt)
+        {'type': 'chain_mvt', 'debit_msat': fundamt * 1000, 'credit_msat': 0, 'tags': ['channel_close', 'splice']},
+        # channel_open  [utxo created], chain_mvt   (fundamt - spliceamt)
+        {'type': 'chain_mvt', 'credit_msat': (fundamt + spliceamt) * 1000, 'debit_msat': 0, 'tags': ['channel_open', 'opener']},
+    ]
+    check_coin_moves(l1, first_channel_id(l1, l2), expected_channel_moves, chainparams)
+
+    # Make sure the channel isn't marked as closed in bookkeeper
+    account_id = first_channel_id(l1, l2)
+    account_info = only_one([acct for acct in l1.rpc.bkpr_listbalances()['accounts'] if acct['account'] == account_id])
+    assert not account_info['account_closed']
+
+    # We'd also expect the wallet to be down by splice amt + fees
+    onchain_fees = [fee for fee in l1.rpc.bkpr_listincome()['income_events'] if fee['tag'] == 'onchain_fee']
+    assert len(onchain_fees) == 2
+    total_fees = sum([x['debit_msat'] for x in onchain_fees])
+    assert starting_wallet_msat == end_wallet_balance + total_fees + end_channel_balance
+
+    # Now close the channel and check that everything resolves as expected
+    l1.rpc.close(l2.info['id'])
+    l1.wait_for_channel_onchain(l2.info['id'])
+    account_info = only_one([acct for acct in l1.rpc.bkpr_listbalances()['accounts'] if acct['account'] == account_id])
+    assert not account_info['account_closed']

tests/utils.py

@@ -74,6 +74,12 @@ def expected_channel_features(extra=[]):
     return hex_bits(features + extra)
 
 
+def bkpr_account_balance(node, acct_id):
+    balances = node.rpc.bkpr_listbalances()['accounts']
+    acct = only_one([acct for acct in balances if acct['account'] == acct_id])
+    return only_one(acct['balances'])['balance_msat']
+
+
 def move_matches(exp, mv):
     if mv['type'] != exp['type']:
         return False