LNWatcher: Distinguish between blockchain-triggered channel state
transitions, and actions taken as a result. - state transitions are performed in lnchannel.update_onchain_state() - peer actions are in LNWorker.on_channel_update()
This commit is contained in:
ThomasV
@@ -54,6 +54,7 @@ from .lnsweep import create_sweeptxs_for_our_ctx, create_sweeptxs_for_their_ctx
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from .lnsweep import create_sweeptx_for_their_revoked_htlc, SweepInfo
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from .lnhtlc import HTLCManager
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from .lnmsg import encode_msg, decode_msg
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from .address_synchronizer import TX_HEIGHT_LOCAL
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if TYPE_CHECKING:
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from .lnworker import LNWallet
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@@ -1092,3 +1093,63 @@ class Channel(Logger):
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min_value_worth_closing_channel_over_sat = max(num_htlcs * 10 * self.config[REMOTE].dust_limit_sat,
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500_000)
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return total_value_sat > min_value_worth_closing_channel_over_sat
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def update_onchain_state(self, funding_txid, funding_height, closing_txid, closing_height, keep_watching):
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# note: state transitions are irreversible, but
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# save_funding_height, save_closing_height are reversible
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if funding_height.height == TX_HEIGHT_LOCAL:
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self.update_unfunded_state()
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elif closing_height.height == TX_HEIGHT_LOCAL:
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self.update_funded_state(funding_txid, funding_height)
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else:
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self.update_closed_state(funding_txid, funding_height, closing_txid, closing_height, keep_watching)
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def update_unfunded_state(self):
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self.delete_funding_height()
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self.delete_closing_height()
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if self.get_state() in [channel_states.PREOPENING, channel_states.OPENING, channel_states.FORCE_CLOSING] and self.lnworker:
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if self.constraints.is_initiator:
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# set channel state to REDEEMED so that it can be removed manually
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# to protect ourselves against a server lying by omission,
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# we check that funding_inputs have been double spent and deeply mined
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inputs = self.storage.get('funding_inputs', [])
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if not inputs:
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self.logger.info(f'channel funding inputs are not provided')
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self.set_state(channel_states.REDEEMED)
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for i in inputs:
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spender_txid = self.lnworker.wallet.db.get_spent_outpoint(*i)
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if spender_txid is None:
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continue
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if spender_txid != self.funding_outpoint.txid:
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tx_mined_height = self.lnworker.wallet.get_tx_height(spender_txid)
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if tx_mined_height.conf > lnutil.REDEEM_AFTER_DOUBLE_SPENT_DELAY:
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self.logger.info(f'channel is double spent {inputs}')
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self.set_state(channel_states.REDEEMED)
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break
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else:
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now = int(time.time())
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if now - self.storage.get('init_timestamp', 0) > CHANNEL_OPENING_TIMEOUT:
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self.lnworker.remove_channel(self.channel_id)
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def update_funded_state(self, funding_txid, funding_height):
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self.save_funding_height(funding_txid, funding_height.height, funding_height.timestamp)
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self.delete_closing_height()
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if self.get_state() == channel_states.OPENING:
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if self.short_channel_id is None:
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self.lnworker.maybe_save_short_chan_id(self, funding_height)
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if self.short_channel_id:
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self.set_state(channel_states.FUNDED)
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def update_closed_state(self, funding_txid, funding_height, closing_txid, closing_height, keep_watching):
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self.save_funding_height(funding_txid, funding_height.height, funding_height.timestamp)
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self.save_closing_height(closing_txid, closing_height.height, closing_height.timestamp)
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if self.get_state() < channel_states.CLOSED:
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conf = closing_height.conf
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if conf > 0:
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self.set_state(channel_states.CLOSED)
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else:
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# we must not trust the server with unconfirmed transactions
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# if the remote force closed, we remain OPEN until the closing tx is confirmed
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pass
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if self.get_state() == channel_states.CLOSED and not keep_watching:
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self.set_state(channel_states.REDEEMED)
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@@ -341,23 +341,11 @@ class LNWalletWatcher(LNWatcher):
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@ignore_exceptions
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@log_exceptions
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async def update_channel_state(self, funding_outpoint, funding_txid, funding_height, closing_txid, closing_height, keep_watching):
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# note: state transitions are irreversible, but
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# save_funding_height, save_closing_height are reversible
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chan = self.lnworker.channel_by_txo(funding_outpoint)
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if not chan:
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return
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if funding_height.height == TX_HEIGHT_LOCAL:
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chan.delete_funding_height()
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chan.delete_closing_height()
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await self.lnworker.update_unfunded_channel(chan, funding_txid)
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elif closing_height.height == TX_HEIGHT_LOCAL:
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chan.save_funding_height(funding_txid, funding_height.height, funding_height.timestamp)
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chan.delete_closing_height()
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await self.lnworker.update_open_channel(chan, funding_txid, funding_height)
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else:
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chan.save_funding_height(funding_txid, funding_height.height, funding_height.timestamp)
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chan.save_closing_height(closing_txid, closing_height.height, closing_height.timestamp)
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await self.lnworker.update_closed_channel(chan, funding_txid, funding_height, closing_txid, closing_height, keep_watching)
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chan.update_onchain_state(funding_txid, funding_height, closing_txid, closing_height, keep_watching)
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await self.lnworker.on_channel_update(chan)
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async def do_breach_remedy(self, funding_outpoint, closing_tx, spenders):
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chan = self.lnworker.channel_by_txo(funding_outpoint)
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@@ -696,57 +696,24 @@ class LNWallet(LNWorker):
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if chan.funding_outpoint.to_str() == txo:
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return chan
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async def update_unfunded_channel(self, chan, funding_txid):
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if chan.get_state() in [channel_states.PREOPENING, channel_states.OPENING, channel_states.FORCE_CLOSING]:
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if chan.constraints.is_initiator:
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# set channel state to REDEEMED so that it can be removed manually
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# to protect ourselves against a server lying by omission,
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# we check that funding_inputs have been double spent and deeply mined
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inputs = chan.storage.get('funding_inputs', [])
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if not inputs:
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self.logger.info(f'channel funding inputs are not provided')
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chan.set_state(channel_states.REDEEMED)
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for i in inputs:
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spender_txid = self.wallet.db.get_spent_outpoint(*i)
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if spender_txid is None:
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continue
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if spender_txid != funding_txid:
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tx_mined_height = self.wallet.get_tx_height(spender_txid)
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if tx_mined_height.conf > lnutil.REDEEM_AFTER_DOUBLE_SPENT_DELAY:
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self.logger.info(f'channel is double spent {inputs}')
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chan.set_state(channel_states.REDEEMED)
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break
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else:
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now = int(time.time())
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if now - chan.storage.get('init_timestamp', 0) > CHANNEL_OPENING_TIMEOUT:
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self.remove_channel(chan.channel_id)
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async def update_open_channel(self, chan, funding_txid, funding_height):
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async def on_channel_update(self, chan):
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if chan.get_state() == channel_states.OPEN and chan.should_be_closed_due_to_expiring_htlcs(self.network.get_local_height()):
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self.logger.info(f"force-closing due to expiring htlcs")
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await self.try_force_closing(chan.channel_id)
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return
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if chan.get_state() == channel_states.OPENING:
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if chan.short_channel_id is None:
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self.maybe_save_short_chan_id(chan, funding_height)
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if chan.short_channel_id:
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chan.set_state(channel_states.FUNDED)
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if chan.get_state() == channel_states.FUNDED:
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elif chan.get_state() == channel_states.FUNDED:
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peer = self.peers.get(chan.node_id)
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if peer and peer.is_initialized():
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peer.send_funding_locked(chan)
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elif chan.get_state() == channel_states.OPEN:
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peer = self.peers.get(chan.node_id)
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if peer is None:
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self.logger.info("peer not found for {}".format(bh2u(chan.node_id)))
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return
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await peer.maybe_update_fee(chan)
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conf = self.lnwatcher.get_tx_height(chan.funding_outpoint.txid).conf
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peer.on_network_update(chan, conf)
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if peer:
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await peer.maybe_update_fee(chan)
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conf = self.lnwatcher.get_tx_height(chan.funding_outpoint.txid).conf
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peer.on_network_update(chan, conf)
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elif chan.get_state() == channel_states.FORCE_CLOSING:
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force_close_tx = chan.force_close_tx()
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@@ -757,19 +724,6 @@ class LNWallet(LNWorker):
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await self.network.try_broadcasting(force_close_tx, 'force-close')
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async def update_closed_channel(self, chan, funding_txid, funding_height, closing_txid, closing_height, keep_watching):
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if chan.get_state() < channel_states.CLOSED:
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conf = closing_height.conf
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if conf > 0:
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chan.set_state(channel_states.CLOSED)
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else:
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# we must not trust the server with unconfirmed transactions
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# if the remote force closed, we remain OPEN until the closing tx is confirmed
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pass
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if chan.get_state() == channel_states.CLOSED and not keep_watching:
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chan.set_state(channel_states.REDEEMED)
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@log_exceptions
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