tcode refactoring: _maybe_fullfill_htlc, _maybe_forward_htlc - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
DIR Log
DIR Files
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DIR Submodules
---
DIR commit 86b33a563781a6f30d8ad4d85b1bcb38e667f773
DIR parent 5d26f51ad09ddc4dd8eb3d48d25bf2e76de17e4d
HTML Author: ThomasV <thomasv@electrum.org>
Date: Mon, 11 Feb 2019 16:31:50 +0100
code refactoring: _maybe_fullfill_htlc, _maybe_forward_htlc
Diffstat:
M electrum/lnpeer.py | 82 ++++++++++++++++---------------
1 file changed, 43 insertions(+), 39 deletions(-)
---
DIR diff --git a/electrum/lnpeer.py b/electrum/lnpeer.py
t@@ -917,45 +917,50 @@ class Peer(PrintError):
htlc = {'amount_msat': amount_msat_htlc, 'payment_hash':payment_hash, 'cltv_expiry':cltv_expiry}
htlc_id = chan.receive_htlc(htlc)
local_ctn = chan.get_current_ctn(LOCAL)
- asyncio.ensure_future(self._on_update_add_htlc(chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion))
+ if processed_onion.are_we_final:
+ asyncio.ensure_future(self._maybe_fulfill_htlc(chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion))
+ else:
+ asyncio.ensure_future(self._maybe_forward_htlc(chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion))
- @log_exceptions
- async def _on_update_add_htlc(self, chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion):
+ @log_exceptions
+ async def _maybe_forward_htlc(self, chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion):
await self.await_local(chan, local_ctn)
# Forward HTLC
# FIXME: this is not robust to us going offline before payment is fulfilled
- if not processed_onion.are_we_final:
- dph = processed_onion.hop_data.per_hop
- next_chan = self.lnworker.get_channel_by_short_id(dph.short_channel_id)
- next_peer = self.lnworker.peers[next_chan.node_id]
- if next_chan is None or next_chan.get_state() != 'OPEN':
- self.print_error("cannot forward htlc", next_chan.get_state() if next_chan else None)
- reason = OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
- await self.fail_htlc(chan, htlc_id, onion_packet, reason)
- return
- self.print_error('forwarding htlc to', next_chan.node_id)
- next_cltv_expiry = int.from_bytes(dph.outgoing_cltv_value, 'big')
- next_amount_msat_htlc = int.from_bytes(dph.amt_to_forward, 'big')
- next_htlc = {'amount_msat':next_amount_msat_htlc, 'payment_hash':payment_hash, 'cltv_expiry':next_cltv_expiry}
- next_htlc_id = next_chan.add_htlc(next_htlc)
- next_remote_ctn = next_chan.get_current_ctn(REMOTE)
- next_peer.send_message(
- "update_add_htlc",
- channel_id=next_chan.channel_id,
- id=next_htlc_id,
- cltv_expiry=dph.outgoing_cltv_value,
- amount_msat=dph.amt_to_forward,
- payment_hash=payment_hash,
- onion_routing_packet=processed_onion.next_packet.to_bytes()
- )
- next_peer.pending_updates[next_chan] = True
- await next_peer.await_remote(next_chan, next_remote_ctn)
- # wait until we get paid
- preimage = await next_peer.payment_preimages[payment_hash].get()
- # fulfill the original htlc
- await self.fulfill_htlc(chan, htlc_id, preimage)
- self.print_error("htlc forwarded successfully")
+ dph = processed_onion.hop_data.per_hop
+ next_chan = self.lnworker.get_channel_by_short_id(dph.short_channel_id)
+ next_peer = self.lnworker.peers[next_chan.node_id]
+ if next_chan is None or next_chan.get_state() != 'OPEN':
+ self.print_error("cannot forward htlc", next_chan.get_state() if next_chan else None)
+ reason = OnionRoutingFailureMessage(code=OnionFailureCode.PERMANENT_CHANNEL_FAILURE, data=b'')
+ await self.fail_htlc(chan, htlc_id, onion_packet, reason)
return
+ self.print_error('forwarding htlc to', next_chan.node_id)
+ next_cltv_expiry = int.from_bytes(dph.outgoing_cltv_value, 'big')
+ next_amount_msat_htlc = int.from_bytes(dph.amt_to_forward, 'big')
+ next_htlc = {'amount_msat':next_amount_msat_htlc, 'payment_hash':payment_hash, 'cltv_expiry':next_cltv_expiry}
+ next_htlc_id = next_chan.add_htlc(next_htlc)
+ next_remote_ctn = next_chan.get_current_ctn(REMOTE)
+ next_peer.send_message(
+ "update_add_htlc",
+ channel_id=next_chan.channel_id,
+ id=next_htlc_id,
+ cltv_expiry=dph.outgoing_cltv_value,
+ amount_msat=dph.amt_to_forward,
+ payment_hash=payment_hash,
+ onion_routing_packet=processed_onion.next_packet.to_bytes()
+ )
+ next_peer.pending_updates[next_chan] = True
+ await next_peer.await_remote(next_chan, next_remote_ctn)
+ # wait until we get paid
+ preimage = await next_peer.payment_preimages[payment_hash].get()
+ # fulfill the original htlc
+ await self._fulfill_htlc(chan, htlc_id, preimage)
+ self.print_error("htlc forwarded successfully")
+
+ @log_exceptions
+ async def _maybe_fulfill_htlc(self, chan, local_ctn, htlc_id, htlc, payment_hash, cltv_expiry, amount_msat_htlc, processed_onion):
+ await self.await_local(chan, local_ctn)
try:
preimage, invoice = self.lnworker.get_invoice(payment_hash)
except UnknownPaymentHash:
t@@ -986,12 +991,11 @@ class Peer(PrintError):
await self.fail_htlc(chan, htlc_id, onion_packet, reason)
return
self.network.trigger_callback('htlc_added', UpdateAddHtlc(**htlc, htlc_id=htlc_id), invoice, RECEIVED)
- # settle htlc
- if not self.network.config.debug_lightning_do_not_settle:
- # settle htlc
- await self.fulfill_htlc(chan, htlc_id, preimage)
+ if self.network.config.debug_lightning_do_not_settle:
+ return
+ await self._fulfill_htlc(chan, htlc_id, preimage)
- async def fulfill_htlc(self, chan: Channel, htlc_id: int, preimage: bytes):
+ async def _fulfill_htlc(self, chan: Channel, htlc_id: int, preimage: bytes):
chan.settle_htlc(preimage, htlc_id)
remote_ctn = chan.get_current_ctn(REMOTE)
self.send_message("update_fulfill_htlc",