lnwatcher/txbatcher: more logging

log more clearly if an input is considered dust, this makes the logs
more helpful when debugging sweeping of lightning utxos.

Author: f321x

electrum/lnwatcher.py

@@ -210,10 +210,12 @@ def maybe_redeem(self, sweep_info: 'SweepInfo') -> bool:
         try:
             self.lnworker.wallet.txbatcher.add_sweep_input('lnwatcher', sweep_info)
         except BelowDustLimit:
+            self.logger.debug(f"maybe_redeem: BelowDustLimit: {sweep_info.name}")
             # utxo is considered dust at *current* fee estimates.
             # but maybe the fees atm are very high? We will retry later.
             pass
         except NoDynamicFeeEstimates:
+            self.logger.debug(f"maybe_redeem: NoDynamicFeeEstimates: {sweep_info.name}")
             pass  # will retry later
         if sweep_info.is_anchor():
             return False

electrum/txbatcher.py

@@ -272,9 +272,10 @@ def is_dust(self, sweep_info: SweepInfo) -> bool:
         value = sweep_info.txin.value_sats()
         witness_size = len(sweep_info.txin.make_witness(71*b'\x00'))
         tx_size_vbytes = 84 + witness_size//4     # assumes no batching, sweep to p2wpkh
-        self.logger.info(f'{sweep_info.name} size = {tx_size_vbytes}')
         fee = self.fee_policy.estimate_fee(tx_size_vbytes, network=self.wallet.network)
-        return value - fee <= dust_threshold()
+        is_dust = value - fee <= dust_threshold()
+        self.logger.info(f'{sweep_info.name} size = {tx_size_vbytes}: {is_dust=}')
+        return is_dust
 
     @locked
     def add_sweep_input(self, sweep_info: 'SweepInfo') -> None: