commit 3ed6afce64b44431be87409e6ef64de8d29c979f
parent 79d202485e1747ad5d16cecb7c35db64ce502177
Author: SomberNight <somber.night@protonmail.com>
Date: Thu, 26 Mar 2020 07:09:38 +0100
lnchannel: implement freezing channels (for receiving)
A bit weird, I know... :)
It allows for rebalancing our own channels! :P
Diffstat:
4 files changed, 56 insertions(+), 31 deletions(-)
diff --git a/electrum/gui/qt/channels_list.py b/electrum/gui/qt/channels_list.py
@@ -146,10 +146,15 @@ class ChannelsList(MyTreeView):
cc.addAction(_("Long Channel ID"), lambda: self.place_text_on_clipboard(channel_id.hex(),
title=_("Long Channel ID")))
- if not chan.is_frozen():
- menu.addAction(_("Freeze"), lambda: chan.set_frozen(True))
+ if not chan.is_frozen_for_sending():
+ menu.addAction(_("Freeze (for sending)"), lambda: chan.set_frozen_for_sending(True))
else:
- menu.addAction(_("Unfreeze"), lambda: chan.set_frozen(False))
+ menu.addAction(_("Unfreeze (for sending)"), lambda: chan.set_frozen_for_sending(False))
+ if not chan.is_frozen_for_receiving():
+ menu.addAction(_("Freeze (for receiving)"), lambda: chan.set_frozen_for_receiving(True))
+ else:
+ menu.addAction(_("Unfreeze (for receiving)"), lambda: chan.set_frozen_for_receiving(False))
+
funding_tx = self.parent.wallet.db.get_transaction(chan.funding_outpoint.txid)
if funding_tx:
@@ -212,18 +217,22 @@ class ChannelsList(MyTreeView):
def _update_chan_frozen_bg(self, *, chan: Channel, items: Sequence[QStandardItem]):
assert self._default_item_bg_brush is not None
- for col in [
- self.Columns.LOCAL_BALANCE,
- self.Columns.REMOTE_BALANCE,
- self.Columns.CHANNEL_STATUS,
- ]:
- item = items[col]
- if chan.is_frozen():
- item.setBackground(ColorScheme.BLUE.as_color(True))
- item.setToolTip(_("This channel is frozen. Frozen channels will not be used for outgoing payments."))
- else:
- item.setBackground(self._default_item_bg_brush)
- item.setToolTip("")
+ # frozen for sending
+ item = items[self.Columns.LOCAL_BALANCE]
+ if chan.is_frozen_for_sending():
+ item.setBackground(ColorScheme.BLUE.as_color(True))
+ item.setToolTip(_("This channel is frozen for sending. It will not be used for outgoing payments."))
+ else:
+ item.setBackground(self._default_item_bg_brush)
+ item.setToolTip("")
+ # frozen for receiving
+ item = items[self.Columns.REMOTE_BALANCE]
+ if chan.is_frozen_for_receiving():
+ item.setBackground(ColorScheme.BLUE.as_color(True))
+ item.setToolTip(_("This channel is frozen for receiving. It will not be included in invoices."))
+ else:
+ item.setBackground(self._default_item_bg_brush)
+ item.setToolTip("")
def update_can_send(self, lnworker: LNWallet):
msg = _('Can send') + ' ' + self.parent.format_amount(lnworker.num_sats_can_send())\
diff --git a/electrum/lnchannel.py b/electrum/lnchannel.py
@@ -392,18 +392,30 @@ class Channel(Logger):
def is_redeemed(self):
return self.get_state() == channel_states.REDEEMED
- def is_frozen(self) -> bool:
- """Whether the user has marked this channel as frozen.
+ def is_frozen_for_sending(self) -> bool:
+ """Whether the user has marked this channel as frozen for sending.
Frozen channels are not supposed to be used for new outgoing payments.
(note that payment-forwarding ignores this option)
"""
return self.storage.get('frozen_for_sending', False)
- def set_frozen(self, b: bool) -> None:
+ def set_frozen_for_sending(self, b: bool) -> None:
self.storage['frozen_for_sending'] = bool(b)
if self.lnworker:
self.lnworker.network.trigger_callback('channel', self)
+ def is_frozen_for_receiving(self) -> bool:
+ """Whether the user has marked this channel as frozen for receiving.
+ Frozen channels are not supposed to be used for new incoming payments.
+ (note that payment-forwarding ignores this option)
+ """
+ return self.storage.get('frozen_for_receiving', False)
+
+ def set_frozen_for_receiving(self, b: bool) -> None:
+ self.storage['frozen_for_receiving'] = bool(b)
+ if self.lnworker:
+ self.lnworker.network.trigger_callback('channel', self)
+
def _assert_can_add_htlc(self, *, htlc_proposer: HTLCOwner, amount_msat: int) -> None:
"""Raises PaymentFailure if the htlc_proposer cannot add this new HTLC.
(this is relevant both for forwarding and endpoint)
@@ -437,11 +449,9 @@ class Channel(Logger):
if amount_msat > LN_MAX_HTLC_VALUE_MSAT and not self._ignore_max_htlc_value:
raise PaymentFailure(f"HTLC value over protocol maximum: {amount_msat} > {LN_MAX_HTLC_VALUE_MSAT} msat")
- def can_pay(self, amount_msat: int) -> bool:
- """Returns whether we can initiate a new payment of given value.
- (we are the payer, not just a forwarding node)
- """
- if self.is_frozen():
+ def can_pay(self, amount_msat: int, *, check_frozen=False) -> bool:
+ """Returns whether we can add an HTLC of given value."""
+ if check_frozen and self.is_frozen_for_sending():
return False
try:
self._assert_can_add_htlc(htlc_proposer=LOCAL, amount_msat=amount_msat)
@@ -449,6 +459,16 @@ class Channel(Logger):
return False
return True
+ def can_receive(self, amount_msat: int, *, check_frozen=False) -> bool:
+ """Returns whether the remote can add an HTLC of given value."""
+ if check_frozen and self.is_frozen_for_receiving():
+ return False
+ try:
+ self._assert_can_add_htlc(htlc_proposer=REMOTE, amount_msat=amount_msat)
+ except PaymentFailure:
+ return False
+ return True
+
def should_try_to_reestablish_peer(self) -> bool:
return channel_states.PREOPENING < self._state < channel_states.FORCE_CLOSING and self.peer_state == peer_states.DISCONNECTED
diff --git a/electrum/lnrouter.py b/electrum/lnrouter.py
@@ -205,11 +205,12 @@ class LNPathFinder(Logger):
is_mine = edge_channel_id in my_channels
if is_mine:
if edge_startnode == nodeA: # payment outgoing, on our channel
- if not my_channels[edge_channel_id].can_pay(amount_msat):
+ if not my_channels[edge_channel_id].can_pay(amount_msat, check_frozen=True):
return
else: # payment incoming, on our channel. (funny business, cycle weirdness)
assert edge_endnode == nodeA, (bh2u(edge_startnode), bh2u(edge_endnode))
- pass # TODO?
+ if not my_channels[edge_channel_id].can_receive(amount_msat, check_frozen=True):
+ return
edge_cost, fee_for_edge_msat = self._edge_cost(
edge_channel_id,
start_node=edge_startnode,
diff --git a/electrum/lnworker.py b/electrum/lnworker.py
@@ -1266,12 +1266,7 @@ class LNWallet(LNWorker):
if chan.short_channel_id is not None}
# note: currently we add *all* our channels; but this might be a privacy leak?
for chan in channels:
- # check channel is open
- if chan.get_state() != channel_states.OPEN:
- continue
- # check channel has sufficient balance
- # FIXME because of on-chain fees of ctx, this check is insufficient
- if amount_sat and chan.balance(REMOTE) // 1000 < amount_sat:
+ if not chan.can_receive(amount_sat, check_frozen=True):
continue
chan_id = chan.short_channel_id
assert isinstance(chan_id, bytes), chan_id
