simplify get_tx_fee

electrum/address_synchronizer.py

@@ -451,7 +451,7 @@ class AddressSynchronizer(Logger):
         for tx_hash in tx_deltas:
             delta = tx_deltas[tx_hash]
             tx_mined_status = self.get_tx_height(tx_hash)
-            fee, is_calculated_by_us = self.get_tx_fee(tx_hash)
+            fee = self.get_tx_fee(tx_hash)
             history.append((tx_hash, tx_mined_status, delta, fee))
         history.sort(key = lambda x: self.get_txpos(x[0]), reverse=True)
         # 3. add balance
@@ -689,39 +689,37 @@ class AddressSynchronizer(Logger):
             fee = None
         return is_relevant, is_mine, v, fee
 
-    def get_tx_fee(self, txid: str) -> Tuple[Optional[int], bool]:
+    def get_tx_fee(self, txid: str) -> Optional[int]:
-        """Returns (tx_fee, is_calculated_by_us)."""
+        """ Returns tx_fee or None. Use server fee only if tx is unconfirmed and not mine"""
         # check if stored fee is available
-        # return that, if is_calc_by_us
+        fee = self.db.get_tx_fee(txid, trust_server=False)
-        fee = None
+        if fee is not None:
-        fee_and_bool = self.db.get_tx_fee(txid)
+            return fee
-        if fee_and_bool is not None:
-            fee, is_calc_by_us = fee_and_bool
-            if is_calc_by_us:
-                return fee, is_calc_by_us
-            elif self.get_tx_height(txid).conf > 0:
         # delete server-sent fee for confirmed txns
+        confirmed = self.get_tx_height(txid).conf > 0
+        if confirmed:
             self.db.add_tx_fee_from_server(txid, None)
-                fee = None
         # if all inputs are ismine, try to calc fee now;
         # otherwise, return stored value
         num_all_inputs = self.db.get_num_all_inputs_of_tx(txid)
         if num_all_inputs is not None:
+            # check if tx is mine
             num_ismine_inputs = self.db.get_num_ismine_inputs_of_tx(txid)
             assert num_ismine_inputs <= num_all_inputs, (num_ismine_inputs, num_all_inputs)
+            # trust server if tx is unconfirmed and not mine
             if num_ismine_inputs < num_all_inputs:
-                return fee, False
+                return None if confirmed else self.db.get_tx_fee(txid, trust_server=True)
         # lookup tx and deserialize it.
         # note that deserializing is expensive, hence above hacks
         tx = self.db.get_transaction(txid)
         if not tx:
-            return None, False
+            return None
         with self.lock, self.transaction_lock:
             is_relevant, is_mine, v, fee = self.get_wallet_delta(tx)
         # save result
         self.db.add_tx_fee_we_calculated(txid, fee)
         self.db.add_num_inputs_to_tx(txid, len(tx.inputs()))
-        return fee, True
+        return fee
 
     def get_addr_io(self, address):
         with self.lock, self.transaction_lock:

electrum/json_db.py

@@ -699,12 +699,14 @@ class JsonDB(Logger):
         self.tx_fees[txid] = self.tx_fees[txid]._replace(fee=fee_sat, is_calculated_by_us=True)
 
     @locked
-    def get_tx_fee(self, txid: str) -> Optional[Tuple[Optional[int], bool]]:
+    def get_tx_fee(self, txid: str, *, trust_server=False) -> Optional[int]:
-        """Returns (tx_fee, is_calculated_by_us)."""
+        """Returns tx_fee."""
         tx_fees_value = self.tx_fees.get(txid)
         if tx_fees_value is None:
             return None
-        return tx_fees_value.fee, tx_fees_value.is_calculated_by_us
+        if not trust_server and not tx_fees_value.is_calculated_by_us:
+            return None
+        return tx_fees_value.fee
 
     @modifier
     def add_num_inputs_to_tx(self, txid: str, num_inputs: int) -> None:

electrum/wallet.py

@@ -409,7 +409,7 @@ class Abstract_Wallet(AddressSynchronizer):
                 elif tx_mined_status.height in (TX_HEIGHT_UNCONF_PARENT, TX_HEIGHT_UNCONFIRMED):
                     status = _('Unconfirmed')
                     if fee is None:
-                        fee, _calc_by_us = self.get_tx_fee(tx_hash)
+                        fee = self.get_tx_fee(tx_hash, trust_server=True)
                     if fee and self.network and self.config.has_fee_mempool():
                         size = tx.estimated_size()
                         fee_per_byte = fee / size
@@ -722,7 +722,7 @@ class Abstract_Wallet(AddressSynchronizer):
             is_final = tx and tx.is_final()
             if not is_final:
                 extra.append('rbf')
-            fee, _calc_by_us = self.get_tx_fee(tx_hash)
+            fee = self.get_tx_fee(tx_hash, trust_server=True)
             if fee is not None:
                 size = tx.estimated_size()
                 fee_per_byte = fee / size
@@ -1004,8 +1004,8 @@ class Abstract_Wallet(AddressSynchronizer):
         old_tx_size = tx.estimated_size()
         old_txid = tx.txid()
         assert old_txid
-        old_fee, is_calc_by_us = self.get_tx_fee(old_txid)
+        old_fee = self.get_tx_fee(old_txid)
-        if old_fee is None or not is_calc_by_us:
+        if old_fee is None:
             raise CannotBumpFee(_('Cannot bump fee') + ': ' + _('current fee unknown'))
         old_fee_rate = old_fee / old_tx_size  # sat/vbyte
         if new_fee_rate <= old_fee_rate: