create_trampoline_route: check that we can pay the amount and the fees, and that the route is sane
This commit is contained in:
ThomasV
@@ -1281,6 +1281,7 @@ class LNWallet(LNWorker):
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def create_trampoline_route(
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self, amount_msat:int,
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min_cltv_expiry:int,
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invoice_pubkey:bytes,
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invoice_features:int,
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channels: List[Channel],
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@@ -1304,86 +1305,92 @@ class LNWallet(LNWorker):
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else:
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is_legacy = True
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# Find a trampoline. We assume we have a direct channel to trampoline
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for chan in channels:
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if not self.is_trampoline_peer(chan.node_id):
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continue
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if chan.is_active() and chan.can_pay(amount_msat, check_frozen=True):
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trampoline_short_channel_id = chan.short_channel_id
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trampoline_node_id = chan.node_id
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break
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else:
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raise NoPathFound()
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# use attempt number to decide fee and second trampoline
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# we need a state with the list of nodes we have not tried
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# add optional second trampoline
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trampoline2 = None
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if is_legacy:
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for node_id in self.trampoline2_list:
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if node_id != trampoline_node_id:
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trampoline2 = node_id
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break
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# fee level. the same fee is used for all trampolines
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if self.trampoline_fee_level < len(TRAMPOLINE_FEES):
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params = TRAMPOLINE_FEES[self.trampoline_fee_level]
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else:
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raise NoPathFound()
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self.logger.info(f'create route with trampoline: fee_level={self.trampoline_fee_level}, is legacy: {is_legacy}')
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self.logger.info(f'first trampoline: {trampoline_node_id.hex()}')
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self.logger.info(f'second trampoline: {trampoline2.hex() if trampoline2 else None}')
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self.logger.info(f'params: {params}')
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# node_features is only used to determine is_tlv
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trampoline_features = LnFeatures.VAR_ONION_OPT
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# hop to trampoline
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route = [
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RouteEdge(
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node_id=trampoline_node_id,
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short_channel_id=trampoline_short_channel_id,
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fee_base_msat=0,
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fee_proportional_millionths=0,
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cltv_expiry_delta=0,
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node_features=trampoline_features)
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]
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# trampoline hop
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route.append(
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TrampolineEdge(
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node_id=trampoline_node_id,
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fee_base_msat=params['fee_base_msat'],
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fee_proportional_millionths=params['fee_proportional_millionths'],
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cltv_expiry_delta=params['cltv_expiry_delta'],
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node_features=trampoline_features))
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if trampoline2:
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# Find a trampoline. We assume we have a direct channel to trampoline
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for chan in channels:
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if not self.is_trampoline_peer(chan.node_id):
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continue
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trampoline_short_channel_id = chan.short_channel_id
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trampoline_node_id = chan.node_id
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# use attempt number to decide fee and second trampoline
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# we need a state with the list of nodes we have not tried
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# add optional second trampoline
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trampoline2 = None
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if is_legacy:
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for node_id in self.trampoline2_list:
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if node_id != trampoline_node_id:
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trampoline2 = node_id
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break
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# node_features is only used to determine is_tlv
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trampoline_features = LnFeatures.VAR_ONION_OPT
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# hop to trampoline
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route = [
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RouteEdge(
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node_id=trampoline_node_id,
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short_channel_id=trampoline_short_channel_id,
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fee_base_msat=0,
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fee_proportional_millionths=0,
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cltv_expiry_delta=0,
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node_features=trampoline_features)
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]
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# trampoline hop
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route.append(
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TrampolineEdge(
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node_id=trampoline2,
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node_id=trampoline_node_id,
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fee_base_msat=params['fee_base_msat'],
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fee_proportional_millionths=params['fee_proportional_millionths'],
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cltv_expiry_delta=params['cltv_expiry_delta'],
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node_features=trampoline_features))
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# add routing info
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if is_legacy:
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invoice_routing_info = self.encode_routing_info(r_tags)
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route[-1].invoice_routing_info = invoice_routing_info
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route[-1].invoice_features = invoice_features
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if trampoline2:
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route.append(
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TrampolineEdge(
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node_id=trampoline2,
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fee_base_msat=params['fee_base_msat'],
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fee_proportional_millionths=params['fee_proportional_millionths'],
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cltv_expiry_delta=params['cltv_expiry_delta'],
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node_features=trampoline_features))
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# add routing info
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if is_legacy:
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invoice_routing_info = self.encode_routing_info(r_tags)
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route[-1].invoice_routing_info = invoice_routing_info
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route[-1].invoice_features = invoice_features
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else:
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if t_tag:
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pubkey, feebase, feerate, cltv = t_tag
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if route[-1].node_id != pubkey:
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route.append(
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TrampolineEdge(
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node_id=pubkey,
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fee_base_msat=feebase,
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fee_proportional_millionths=feerate,
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cltv_expiry_delta=cltv,
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node_features=trampoline_features))
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# Fake edge (not part of actual route, needed by calc_hops_data)
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route.append(
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TrampolineEdge(
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node_id=invoice_pubkey,
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fee_base_msat=0,
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fee_proportional_millionths=0,
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cltv_expiry_delta=0,
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node_features=trampoline_features))
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# check that we can pay amount and fees
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for edge in route[::-1]:
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amount_msat += edge.fee_for_edge(amount_msat)
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if not chan.can_pay(amount_msat, check_frozen=True):
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continue
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if not is_route_sane_to_use(route, amount_msat, min_cltv_expiry):
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continue
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break
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else:
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if t_tag:
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pubkey, feebase, feerate, cltv = t_tag
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if route[-1].node_id != pubkey:
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route.append(
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TrampolineEdge(
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node_id=pubkey,
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fee_base_msat=feebase,
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fee_proportional_millionths=feerate,
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cltv_expiry_delta=cltv,
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node_features=trampoline_features))
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# Fake edge (not part of actual route, needed by calc_hops_data)
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route.append(
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TrampolineEdge(
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node_id=invoice_pubkey,
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fee_base_msat=0,
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fee_proportional_millionths=0,
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cltv_expiry_delta=0,
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node_features=trampoline_features))
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raise NoPathFound()
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self.logger.info(f'created route with trampoline: fee_level={self.trampoline_fee_level}, is legacy: {is_legacy}')
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self.logger.info(f'first trampoline: {trampoline_node_id.hex()}')
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self.logger.info(f'second trampoline: {trampoline2.hex() if trampoline2 else None}')
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self.logger.info(f'params: {params}')
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return route
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@profiler
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@@ -1422,7 +1429,6 @@ class LNWallet(LNWorker):
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# preference -funds = (low rating=high preference).
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split_configurations = suggest_splits(amount_msat, channels_with_funds)
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for s in split_configurations:
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self.logger.info(f"trying split configuration: {s[0]} rating: {s[1]}")
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routes = []
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try:
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for chanid, part_amount_msat in s[0].items():
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@@ -1441,11 +1447,12 @@ class LNWallet(LNWorker):
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channel,
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full_path=None)
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routes.append((route, amt))
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self.logger.info(f"found acceptable split configuration: {list(s[0].values())} rating: {s[1]}")
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break
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except NoPathFound:
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continue
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else:
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raise NoPathFound
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raise NoPathFound()
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return routes
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def create_route_for_payment(
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@@ -1461,7 +1468,7 @@ class LNWallet(LNWorker):
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channels = [outgoing_channel] if outgoing_channel else list(self.channels.values())
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if not self.channel_db:
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route = self.create_trampoline_route(
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amount_msat, invoice_pubkey, invoice_features, channels, r_tags, t_tags)
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amount_msat, min_cltv_expiry, invoice_pubkey, invoice_features, channels, r_tags, t_tags)
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return route, amount_msat
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route = None
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