txbatcher: add type-hints

electrum/lnwatcher.py

@@ -2,7 +2,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file LICENCE or http://www.opensource.org/licenses/mit-license.php
 
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional
 
 from . import util
 from .util import TxMinedInfo, BelowDustLimit
@@ -88,13 +88,13 @@ class LNWatcher(Logger, EventListener):
         if chan.need_to_subscribe():
             self.add_callback(address, callback)
 
-    def unwatch_channel(self, address, funding_outpoint):
+    def unwatch_channel(self, address: str, funding_outpoint: str) -> None:
         self.logger.info(f'unwatching {funding_outpoint}')
         self.remove_callback(address)
 
     @ignore_exceptions
     @log_exceptions
-    async def check_onchain_situation(self, address, funding_outpoint):
+    async def check_onchain_situation(self, address: str, funding_outpoint: str) -> None:
         # early return if address has not been added yet
         if not self.adb.is_mine(address):
             return
@@ -142,17 +142,18 @@ class LNWatcher(Logger, EventListener):
             self._pending_force_closes.discard(chan)
         await self.lnworker.handle_onchain_state(chan)
 
-    async def sweep_commitment_transaction(self, funding_outpoint, closing_tx) -> bool:
+    async def sweep_commitment_transaction(self, funding_outpoint: str, closing_tx: Transaction) -> bool:
         """This function is called when a channel was closed. In this case
         we need to check for redeemable outputs of the commitment transaction
         or spenders down the line (HTLC-timeout/success transactions).
 
         Returns whether we should continue to monitor.
 
-        Side-effécts:
+        Side-effects:
           - sets defaults labels
           - populates wallet._accounting_addresses
         """
+        assert closing_tx
         chan = self.lnworker.channel_by_txo(funding_outpoint)
         if not chan:
             return False
@@ -188,7 +189,8 @@ class LNWatcher(Logger, EventListener):
                 self.maybe_add_accounting_address(spender_txid, sweep_info)
             else:
                 keep_watching |= was_added
-            self.maybe_add_pending_forceclose(chan, spender_txid, is_local_ctx, sweep_info, was_added)
+            self.maybe_add_pending_forceclose(
+                chan=chan, spender_txid=spender_txid, is_local_ctx=is_local_ctx, sweep_info=sweep_info, was_added=was_added)
         return keep_watching
 
     def get_pending_force_closes(self):
@@ -242,7 +244,15 @@ class LNWatcher(Logger, EventListener):
         txout = prev_tx.outputs()[int(prev_index)]
         self.lnworker.wallet._accounting_addresses.add(txout.address)
 
-    def maybe_add_pending_forceclose(self, chan, spender_txid, is_local_ctx, sweep_info, was_added):
+    def maybe_add_pending_forceclose(
+        self,
+        *,
+        chan: 'AbstractChannel',
+        spender_txid: Optional[str],
+        is_local_ctx: bool,
+        sweep_info: 'SweepInfo',
+        was_added: bool,
+    ):
         """ we are waiting for ctx to be confirmed and there are received htlcs """
         if was_added and is_local_ctx and sweep_info.name == 'received-htlc' and chan.has_anchors():
             tx_mined_status = self.adb.get_tx_height(spender_txid)

electrum/lnworker.py

@@ -1211,6 +1211,7 @@ class LNWallet(LNWorker):
         for chan in self.channel_backups.values():
             if chan.funding_outpoint.to_str() == txo:
                 return chan
+        return None
 
     async def handle_onchain_state(self, chan: Channel):
         if self.network is None:
@@ -1511,6 +1512,7 @@ class LNWallet(LNWorker):
                 return chan
             if chan.get_local_scid_alias() == short_channel_id:
                 return chan
+        return None
 
     def can_pay_invoice(self, invoice: Invoice) -> bool:
         assert invoice.is_lightning()

electrum/txbatcher.py

@@ -1,20 +1,3 @@
-import asyncio
-import threading
-import copy
-
-from typing import Dict, Sequence
-from . import util
-from .bitcoin import dust_threshold
-from .logging import Logger
-from .util import log_exceptions, NotEnoughFunds, BelowDustLimit, NoDynamicFeeEstimates, OldTaskGroup
-from .transaction import PartialTransaction, PartialTxOutput, Transaction
-from .address_synchronizer import TX_HEIGHT_LOCAL, TX_HEIGHT_FUTURE
-from .lnsweep import SweepInfo
-from typing import Optional, TYPE_CHECKING
-
-if TYPE_CHECKING:
-    from .wallet import Abstract_Wallet
-
 # This class batches outgoing payments and incoming utxo sweeps.
 # It ensures that we do not send a payment twice.
 #
@@ -74,9 +57,23 @@ if TYPE_CHECKING:
 # In order to generalize that logic to payments, callers would need to pass a unique ID along with
 # the payment output, so that we can prevent paying twice.
 
+import asyncio
+import threading
+import copy
+from typing import Dict, Sequence, Optional, TYPE_CHECKING, Mapping, Set, List, Tuple
+
+from . import util
+from .bitcoin import dust_threshold
+from .logging import Logger
+from .util import log_exceptions, NotEnoughFunds, BelowDustLimit, NoDynamicFeeEstimates, OldTaskGroup
+from .transaction import PartialTransaction, PartialTxOutput, Transaction, TxOutpoint, PartialTxInput
+from .address_synchronizer import TX_HEIGHT_LOCAL, TX_HEIGHT_FUTURE
+from .lnsweep import SweepInfo
 from .json_db import locked, StoredDict
 from .fee_policy import FeePolicy
 
+if TYPE_CHECKING:
+    from .wallet import Abstract_Wallet
 
 
 class TxBatcher(Logger):
@@ -87,21 +84,21 @@ class TxBatcher(Logger):
         Logger.__init__(self)
         self.lock = threading.RLock()
         self.storage = wallet.db.get_stored_item("tx_batches", {})
-        self.tx_batches = {}
+        self.tx_batches = {}  # type: Dict[str, TxBatch]
         self.wallet = wallet
         for key, item_storage in self.storage.items():
             self.tx_batches[key] = TxBatch(self.wallet, item_storage)
-        self._legacy_htlcs = {}
+        self._legacy_htlcs = {}  # type: Dict[TxOutpoint, SweepInfo]
-        self.taskgroup = None
+        self.taskgroup = None  # type: Optional[OldTaskGroup]
-        self.password_future = None
+        self.password_future = None  # type: Optional[asyncio.Future[Optional[str]]]
 
     @locked
-    def add_payment_output(self, key: str, output: 'PartialTxOutput'):
+    def add_payment_output(self, key: str, output: 'PartialTxOutput') -> None:
         batch = self._maybe_create_new_batch(key, fee_policy_name=key)
         batch.add_payment_output(output)
 
     @locked
-    def add_sweep_input(self, key: str, sweep_info: 'SweepInfo'):
+    def add_sweep_input(self, key: str, sweep_info: 'SweepInfo') -> None:
         if sweep_info.txin and sweep_info.txout:
             # detect legacy htlc using name and csv delay
             if sweep_info.name in ['received-htlc', 'offered-htlc'] and sweep_info.csv_delay == 0:
@@ -116,7 +113,7 @@ class TxBatcher(Logger):
         batch = self._maybe_create_new_batch(key, fee_policy_name)
         batch.add_sweep_input(sweep_info)
 
-    def _maybe_create_new_batch(self, key, fee_policy_name: str):
+    def _maybe_create_new_batch(self, key: str, fee_policy_name: str) -> 'TxBatch':
         assert util.get_running_loop() == util.get_asyncio_loop(), f"this must be run on the asyncio thread!"
         if key not in self.storage:
             self.logger.info(f'creating new batch: {key}')
@@ -127,7 +124,7 @@ class TxBatcher(Logger):
         return self.tx_batches[key]
 
     @locked
-    def delete_batch(self, key):
+    def delete_batch(self, key: str) -> None:
         self.logger.info(f'deleting TxBatch {key}')
         self.storage.pop(key)
         self.tx_batches.pop(key)
@@ -136,17 +133,19 @@ class TxBatcher(Logger):
         for k, v in self.tx_batches.items():
             if v._prevout == prevout:
                 return v
+        return None
 
-    def find_batch_of_txid(self, txid) -> str:
+    def find_batch_of_txid(self, txid: str) -> Optional[str]:
         for k, v in self.tx_batches.items():
             if v.is_mine(txid):
                 return k
+        return None
 
-    def is_mine(self, txid):
+    def is_mine(self, txid: str) -> bool:
         # used to prevent GUI from interfering
         return bool(self.find_batch_of_txid(txid))
 
-    async def run_batch(self, key, batch):
+    async def run_batch(self, key: str, batch: 'TxBatch') -> None:
         await batch.run()
         self.delete_batch(key)
 
@@ -158,13 +157,13 @@ class TxBatcher(Logger):
         async with self.taskgroup as group:
             await group.spawn(self.redeem_legacy_htlcs())
 
-    async def redeem_legacy_htlcs(self):
+    async def redeem_legacy_htlcs(self) -> None:
         while True:
             await asyncio.sleep(self.SLEEP_INTERVAL)
             for sweep_info in self._legacy_htlcs.values():
                 await self._maybe_redeem_legacy_htlcs(sweep_info)
 
-    async def _maybe_redeem_legacy_htlcs(self, sweep_info):
+    async def _maybe_redeem_legacy_htlcs(self, sweep_info: 'SweepInfo') -> None:
         assert sweep_info.csv_delay == 0
         local_height = self.wallet.network.get_local_height()
         wanted_height = sweep_info.cltv_abs
@@ -184,7 +183,7 @@ class TxBatcher(Logger):
         if await self.wallet.network.try_broadcasting(tx, sweep_info.name):
             self.wallet.adb.add_transaction(tx)
 
-    async def get_password(self, txid:str):
+    async def get_password(self, txid: str) -> Optional[str]:
         # daemon, android have password in memory
         password = self.wallet.get_unlocked_password()
         if password:
@@ -194,12 +193,12 @@ class TxBatcher(Logger):
 
             await future
         except asyncio.CancelledError as e:
-            return
+            return None
         password = future.result()
         return password
 
     @locked
-    def set_password_future(self, password: Optional[str]):
+    def set_password_future(self, password: Optional[str]) -> None:
         if self.password_future is not None:
             if password is not None:
                 self.password_future.set_result(password)
@@ -226,25 +225,25 @@ class TxBatch(Logger):
         self.wallet = wallet
         self.storage = storage
         self.lock = threading.RLock()
-        self.batch_payments = []       # list of payments we need to make
+        self.batch_payments = []  # type: List[PartialTxOutput]      # payments we need to make
-        self.batch_inputs = {}         # list of inputs we need to sweep
+        self.batch_inputs = {}  # type: Dict[TxOutpoint, SweepInfo]  # inputs we need to sweep
         # list of tx that were broadcast. Each tx is a RBF replacement of the previous one. Ony one can get mined.
-        self._prevout = storage.get('prevout')
+        self._prevout = storage.get('prevout')  # type: Optional[str]
-        self._batch_txids = storage['txids']
+        self._batch_txids = storage['txids']  # type: List[str]
-        self._fee_policy_name = storage.get('fee_policy_name', 'default')
+        self._fee_policy_name = storage.get('fee_policy_name', 'default')  # type: str
-        self._base_tx = None           # current batch tx. last element of batch_txids
+        self._base_tx = None  # type: Optional[PartialTransaction]   # current batch tx. last element of batch_txids
-        self._parent_tx = None
+        self._parent_tx = None  # type: Optional[PartialTransaction]
-        self._unconfirmed_sweeps = set()  # list of inputs we are sweeping (until spending tx is confirmed)
+        self._unconfirmed_sweeps = set()  # type: Set[TxOutpoint]  # inputs we are sweeping (until spending tx is confirmed)
 
     @property
-    def fee_policy(self):
+    def fee_policy(self) -> FeePolicy:
         # this assumes the descriptor is in config.fee_policy
         cv_name = 'fee_policy' + '.' + self._fee_policy_name
         descriptor = self.wallet.config.get(cv_name, 'eta:2')
         return FeePolicy(descriptor)
 
     @log_exceptions
-    async def run(self):
+    async def run(self) -> None:
         while not self.is_done():
             await asyncio.sleep(self.wallet.txbatcher.SLEEP_INTERVAL)
             if not (self.wallet.network and self.wallet.network.is_connected()):
@@ -255,15 +254,15 @@ class TxBatch(Logger):
                 self.logger.exception(f'TxBatch error: {repr(e)}')
                 break
 
-    def is_mine(self, txid):
+    def is_mine(self, txid: str) -> bool:
         return txid in self._batch_txids
 
     @locked
-    def add_payment_output(self, output: 'PartialTxOutput'):
+    def add_payment_output(self, output: 'PartialTxOutput') -> None:
         # todo: maybe we should raise NotEnoughFunds here
         self.batch_payments.append(output)
 
-    def is_dust(self, sweep_info):
+    def is_dust(self, sweep_info: SweepInfo) -> bool:
         if sweep_info.is_anchor():
             return False
         if sweep_info.txout is not None:
@@ -276,7 +275,7 @@ class TxBatch(Logger):
         return value - fee <= dust_threshold()
 
     @locked
-    def add_sweep_input(self, sweep_info: 'SweepInfo'):
+    def add_sweep_input(self, sweep_info: 'SweepInfo') -> None:
         if self.is_dust(sweep_info):
             raise BelowDustLimit
         txin = sweep_info.txin
@@ -295,7 +294,7 @@ class TxBatch(Logger):
         self.batch_inputs[txin.prevout] = sweep_info
 
     @locked
-    def _to_pay_after(self, tx) -> Sequence[PartialTxOutput]:
+    def _to_pay_after(self, tx: Optional[PartialTransaction]) -> Sequence[PartialTxOutput]:
         if not tx:
             return self.batch_payments
         to_pay = []
@@ -308,7 +307,7 @@ class TxBatch(Logger):
         return to_pay
 
     @locked
-    def _to_sweep_after(self, tx) -> Dict[str, SweepInfo]:
+    def _to_sweep_after(self, tx: Optional[PartialTransaction]) -> Dict[str, SweepInfo]:
         tx_prevouts = set(txin.prevout for txin in tx.inputs()) if tx else set()
         result = []
         for k, v in list(self.batch_inputs.items()):
@@ -331,7 +330,7 @@ class TxBatch(Logger):
             result.append((k,v))
         return dict(result)
 
-    def _should_bump_fee(self, base_tx) -> bool:
+    def _should_bump_fee(self, base_tx: Optional[PartialTransaction]) -> bool:
         if base_tx is None:
             return False
         if not self.is_mine(base_tx.txid()):
@@ -349,12 +348,12 @@ class TxBatch(Logger):
 
     def find_base_tx(self) -> Optional[PartialTransaction]:
         if not self._prevout:
-            return
+            return None
         prev_txid, index = self._prevout.split(':')
         txid = self.wallet.adb.db.get_spent_outpoint(prev_txid, int(index))
         tx = self.wallet.adb.get_transaction(txid) if txid else None
         if not tx:
-            return
+            return None
         tx = PartialTransaction.from_tx(tx)
         tx.add_info_from_wallet(self.wallet)  # this sets is_change
 
@@ -380,7 +379,7 @@ class TxBatch(Logger):
 
         return self._base_tx
 
-    async def run_iteration(self):
+    async def run_iteration(self) -> None:
         base_tx = self.find_base_tx()
         try:
             tx = self.create_next_transaction(base_tx)
@@ -424,18 +423,18 @@ class TxBatch(Logger):
                 self._start_new_batch(base_tx)
 
 
-    async def sign_transaction(self, tx):
+    async def sign_transaction(self, tx: PartialTransaction) -> Optional[PartialTransaction]:
         tx.add_info_from_wallet(self.wallet)  # this adds input amounts
         self.add_sweep_info_to_tx(tx)
         pw_required = self.wallet.has_keystore_encryption() and tx.requires_keystore()
         password = await self.wallet.txbatcher.get_password(tx.txid()) if pw_required else None
         if password is None and pw_required:
-            return
+            return None
         self.wallet.sign_transaction(tx, password)
         assert tx.is_complete()
         return tx
 
-    def create_next_transaction(self, base_tx):
+    def create_next_transaction(self, base_tx: Optional[PartialTransaction]) -> Optional[PartialTransaction]:
         to_pay = self._to_pay_after(base_tx)
         to_sweep = self._to_sweep_after(base_tx)
         to_sweep_now = {}
@@ -447,9 +446,9 @@ class TxBatch(Logger):
                 self.wallet.add_future_tx(v, wanted_height)
         while True:
             if not to_pay and not to_sweep_now and not self._should_bump_fee(base_tx):
-                return
+                return None
             try:
-                tx = self._create_batch_tx(base_tx, to_sweep_now, to_pay)
+                tx = self._create_batch_tx(base_tx=base_tx, to_sweep=to_sweep_now, to_pay=to_pay)
             except NotEnoughFunds:
                 if to_pay:
                     k = max(to_pay, key=lambda x: x.value)
@@ -458,7 +457,7 @@ class TxBatch(Logger):
                     continue
                 else:
                     self.logger.info(f'Not enough funds, waiting')
-                    return
+                    return None
             # 100 kb max standardness rule
             if tx.estimated_size() < 100_000:
                 break
@@ -468,7 +467,7 @@ class TxBatch(Logger):
         self.logger.info(f'created tx {tx.txid()} with {len(tx.inputs())} inputs and {len(tx.outputs())} outputs')
         return tx
 
-    def add_sweep_info_to_tx(self, base_tx):
+    def add_sweep_info_to_tx(self, base_tx: PartialTransaction) -> None:
         for txin in base_tx.inputs():
             if sweep_info := self.batch_inputs.get(txin.prevout):
                 if hasattr(sweep_info.txin, 'make_witness'):
@@ -477,11 +476,17 @@ class TxBatch(Logger):
                     txin.witness_script = sweep_info.txin.witness_script
                     txin.script_sig = sweep_info.txin.script_sig
 
-    def _create_batch_tx(self, base_tx, to_sweep, to_pay):
+    def _create_batch_tx(
+        self,
+        *,
+        base_tx: Optional[PartialTransaction],
+        to_sweep: Mapping[str, SweepInfo],
+        to_pay: Sequence[PartialTxOutput],
+    ) -> PartialTransaction:
         self.logger.info(f'to_sweep: {list(to_sweep.keys())}')
         self.logger.info(f'to_pay: {to_pay}')
-        inputs = []
+        inputs = []  # type: List[PartialTxInput]
-        outputs = []
+        outputs = []  # type: List[PartialTxOutput]
         locktime = base_tx.locktime if base_tx else None
         # sort inputs so that txin-txout pairs are first
         for sweep_info in sorted(to_sweep.values(), key=lambda x: not bool(x.txout)):
@@ -511,7 +516,7 @@ class TxBatch(Logger):
         for o in outputs: assert o in tx.outputs()
         return tx
 
-    def _clear_unconfirmed_sweeps(self, tx):
+    def _clear_unconfirmed_sweeps(self, tx: PartialTransaction) -> None:
         # this ensures that we can accept an input again,
         # in case the sweeping tx has been removed from the blockchain after a reorg
         for txin in tx.inputs():
@@ -519,7 +524,7 @@ class TxBatch(Logger):
                 self._unconfirmed_sweeps.remove(txin.prevout)
 
     @locked
-    def _start_new_batch(self, tx):
+    def _start_new_batch(self, tx: Optional[PartialTransaction]) -> None:
         use_change = tx and tx.has_change() and any([txout in self.batch_payments for txout in tx.outputs()])
         self.batch_payments = self._to_pay_after(tx)
         self.batch_inputs = self._to_sweep_after(tx)
@@ -529,7 +534,7 @@ class TxBatch(Logger):
         self._prevout = None
 
     @locked
-    def _new_base_tx(self, tx: Transaction):
+    def _new_base_tx(self, tx: Transaction) -> None:
         self._prevout = tx.inputs()[0].prevout.to_str()
         self.storage['prevout'] = self._prevout
         if tx.has_change():
@@ -539,7 +544,7 @@ class TxBatch(Logger):
             self.logger.info(f'starting new batch because current base tx does not have change')
             self._start_new_batch(tx)
 
-    def _create_inputs_from_tx_change(self, parent_tx):
+    def _create_inputs_from_tx_change(self, parent_tx: PartialTransaction) -> List[PartialTxInput]:
         inputs = []
         for o in parent_tx.get_change_outputs():
             coins = self.wallet.adb.get_addr_utxo(o.address)
@@ -548,7 +553,7 @@ class TxBatch(Logger):
             txin.nsequence = 0xffffffff - 2
         return inputs
 
-    def _can_broadcast(self, sweep_info: 'SweepInfo', base_tx: 'Transaction'):
+    def _can_broadcast(self, sweep_info: 'SweepInfo', base_tx: 'Transaction') -> Tuple[bool, Optional[int]]:
         prevout = sweep_info.txin.prevout.to_str()
         name = sweep_info.name
         prev_txid, index = prevout.split(':')