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pytest: fix test_penalty_htlc_tx_timeout accounting flake.

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This test makes l2 save db, make a payment, then rollback.
*Sometimes* under CI (but not here) we don't shutdown fast enough
after the payment, so the moves.json from the coin_movements.py
records it.  Sure enough, the result is the node ends up with
a -10000msat balance.

Validated by putting a time.sleep(5) between:

```
    l2.rpc.pay(inv['bolt11'])

    import time
    time.sleep(5)
    # stop both nodes, roll back l2's database
```

The answer, of course, is to save and rollback *both* the db and
moves.json file.

Here's the error:
```
    def test_penalty_htlc_tx_timeout(node_factory, bitcoind, chainparams):
...    
        assert account_balance(l3, channel_id) == 0
>       assert account_balance(l2, channel_id) == 0

tests/test_closing.py:1527: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/utils.py:184: in account_balance
    m_sum -= Millisatoshi(m['debit_msat'])
contrib/pyln-client/pyln/client/lightning.py:197: in __sub__
    return Millisatoshi(int(self) - int(other))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = -10000msat, v = -10000
...    
        if self.millisatoshis < 0:
>           raise ValueError("Millisatoshi must be >= 0")
E           ValueError: Millisatoshi must be >= 0

contrib/pyln-client/pyln/client/lightning.py:82: ValueError
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2023-04-12 14:22:15 +09:30
parent 2e7ecb98f4
commit 58c624d067
1 changed files with 5 additions and 0 deletions
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5
tests/test_closing.py
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@ -1435,6 +1435,10 @@ def test_penalty_htlc_tx_timeout(node_factory, bitcoind, chainparams):
l2_db_path = os.path.join(l2.daemon.lightning_dir, chainparams['name'], 'lightningd.sqlite3')
l2_db_path_bak = os.path.join(l2.daemon.lightning_dir, chainparams['name'], 'lightningd.sqlite3.bak')
copyfile(l2_db_path, l2_db_path_bak)
# make snapshot of l2 moves accounting too!
l2_moves_path = os.path.join(l2.daemon.lightning_dir, chainparams['name'], 'moves.json')
l2_moves_path_bak = os.path.join(l2.daemon.lightning_dir, chainparams['name'], 'moves.json.bak')
copyfile(l2_moves_path, l2_moves_path_bak)
l2.start()
sync_blockheight(bitcoind, [l2])
@ -1450,6 +1454,7 @@ def test_penalty_htlc_tx_timeout(node_factory, bitcoind, chainparams):
l2.stop()
l3.stop()
copyfile(l2_db_path_bak, l2_db_path)
copyfile(l2_moves_path_bak, l2_moves_path)
# start l2, now back a bit. force close channel with l3 while l3 is still offline
l2.start()