lnpeer: handle cooperative close edge-case

fix #6317

electrum/address_synchronizer.py

@@ -30,7 +30,7 @@ from typing import TYPE_CHECKING, Dict, Optional, Set, Tuple, NamedTuple, Sequen
 
 from . import bitcoin, util
 from .bitcoin import COINBASE_MATURITY
-from .util import profiler, bfh, TxMinedInfo
+from .util import profiler, bfh, TxMinedInfo, UnrelatedTransactionException
 from .transaction import Transaction, TxOutput, TxInput, PartialTxInput, TxOutpoint, PartialTransaction
 from .synchronizer import Synchronizer
 from .verifier import SPV
@@ -48,14 +48,6 @@ TX_HEIGHT_LOCAL = -2
 TX_HEIGHT_UNCONF_PARENT = -1
 TX_HEIGHT_UNCONFIRMED = 0
 
-class AddTransactionException(Exception):
-    pass
-
-
-class UnrelatedTransactionException(AddTransactionException):
-    def __str__(self):
-        return _("Transaction is unrelated to this wallet.")
-
 
 class HistoryItem(NamedTuple):
     txid: str

electrum/gui/qt/main_window.py

@@ -60,12 +60,12 @@ from electrum.util import (format_time,
                            UserFacingException,
                            get_new_wallet_name, send_exception_to_crash_reporter,
                            InvalidBitcoinURI, maybe_extract_bolt11_invoice, NotEnoughFunds,
-                           NoDynamicFeeEstimates, MultipleSpendMaxTxOutputs)
+                           NoDynamicFeeEstimates, MultipleSpendMaxTxOutputs,
+                           AddTransactionException)
 from electrum.invoices import PR_TYPE_ONCHAIN, PR_TYPE_LN, PR_DEFAULT_EXPIRATION_WHEN_CREATING, Invoice
 from electrum.invoices import PR_PAID, PR_FAILED, pr_expiration_values, LNInvoice, OnchainInvoice
 from electrum.transaction import (Transaction, PartialTxInput,
                                   PartialTransaction, PartialTxOutput)
-from electrum.address_synchronizer import AddTransactionException
 from electrum.wallet import (Multisig_Wallet, CannotBumpFee, Abstract_Wallet,
                              sweep_preparations, InternalAddressCorruption)
 from electrum.version import ELECTRUM_VERSION

electrum/lnpeer.py

@@ -23,7 +23,8 @@ from . import bitcoin, util
 from . import ecc
 from .ecc import sig_string_from_r_and_s, get_r_and_s_from_sig_string, der_sig_from_sig_string
 from . import constants
-from .util import bh2u, bfh, log_exceptions, ignore_exceptions, chunks, SilentTaskGroup
+from .util import (bh2u, bfh, log_exceptions, ignore_exceptions, chunks, SilentTaskGroup,
+                   UnrelatedTransactionException)
 from . import transaction
 from .transaction import Transaction, TxOutput, PartialTxOutput, match_script_against_template
 from .logging import Logger
@@ -1518,7 +1519,10 @@ class Peer(Logger):
             signing_pubkey=chan.config[REMOTE].multisig_key.pubkey.hex(),
             sig=bh2u(der_sig_from_sig_string(their_sig) + b'\x01'))
         # save local transaction and set state
+        try:
             self.lnworker.wallet.add_transaction(closing_tx)
+        except UnrelatedTransactionException:
+            pass  # this can happen if (~all the balance goes to REMOTE)
         chan.set_state(ChannelState.CLOSING)
         # broadcast
         await self.network.try_broadcasting(closing_tx, 'closing')

electrum/util.py

@@ -119,6 +119,15 @@ class InvalidPassword(Exception):
         return _("Incorrect password")
 
 
+class AddTransactionException(Exception):
+    pass
+
+
+class UnrelatedTransactionException(AddTransactionException):
+    def __str__(self):
+        return _("Transaction is unrelated to this wallet.")
+
+
 class FileImportFailed(Exception):
     def __init__(self, message=''):
         self.message = str(message)