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74ddc15435
This likely lead to a number of false errors when attempting to route. We deemed a channel to be unusable as soon as either direction isn't usable. This is bad since it excludes not only zeroconf channels (which have different scids for the two directions), but it also excludes any channel that we haven't seen an update from yet. This was likely introduced when attemting to exclude nodes that haven't sent a disable, but their peer has, but this is not necessary as the unresponsive node would be marked as isolated by all its peers, so we don't need to artificially mark a channel direction as disabled when really we can't even enter the node to traverse the channel in that direction. Changelog-Fixed: routing: Fixed an issue where we would exclude the entire channel if either direction was disabled, or we hadn't seen an update yet.
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
#include "config.h"
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#include <assert.h>
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#include <common/dijkstra.h>
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#include <common/features.h>
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#include <common/gossmap.h>
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#include <common/route.h>
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bool route_can_carry_even_disabled(const struct gossmap *map,
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const struct gossmap_chan *c,
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int dir,
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struct amount_msat amount,
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void *unused)
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{
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if (!gossmap_chan_set(c, dir))
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return false;
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if (!gossmap_chan_capacity(c, dir, amount))
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return false;
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return true;
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}
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/* Generally only one side gets marked disabled, but it's disabled. */
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bool route_can_carry(const struct gossmap *map,
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const struct gossmap_chan *c,
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int dir,
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struct amount_msat amount,
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void *arg)
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{
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if (!c->half[dir].enabled)
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return false;
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return route_can_carry_even_disabled(map, c, dir, amount, arg);
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}
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/* Squeeze total costs into a u32 */
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static u32 costs_to_score(struct amount_msat cost,
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struct amount_msat risk)
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{
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u64 costs = cost.millisatoshis + risk.millisatoshis; /* Raw: score */
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if (costs > 0xFFFFFFFF)
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costs = 0xFFFFFFFF;
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return costs;
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}
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/* Prioritize distance over costs */
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u64 route_score_shorter(u32 distance,
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struct amount_msat cost,
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struct amount_msat risk,
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int dir UNUSED,
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const struct gossmap_chan *c UNUSED)
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{
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return costs_to_score(cost, risk) + ((u64)distance << 32);
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}
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/* Prioritize costs over distance */
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u64 route_score_cheaper(u32 distance,
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struct amount_msat cost,
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struct amount_msat risk,
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int dir UNUSED,
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const struct gossmap_chan *c UNUSED)
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{
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return ((u64)costs_to_score(cost, risk) << 32) + distance;
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}
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/* Recursive version: return false if we can't get there.
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*
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* amount and cltv are updated, and reflect the amount we
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* and delay would have to put into the first channel (usually
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* ignored, since we don't pay for our own channels!).
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*/
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static bool dijkstra_to_hops(struct route_hop **hops,
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const struct gossmap *gossmap,
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const struct dijkstra *dij,
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const struct gossmap_node *cur,
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struct amount_msat *amount,
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u32 *cltv)
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{
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u32 curidx = gossmap_node_idx(gossmap, cur);
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u32 dist = dijkstra_distance(dij, curidx);
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struct gossmap_chan *c;
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const struct gossmap_node *next;
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size_t num_hops = tal_count(*hops);
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const struct half_chan *h;
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if (dist == 0)
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return true;
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if (dist == UINT_MAX)
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return false;
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tal_resize(hops, num_hops + 1);
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/* OK, populate other fields. */
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c = dijkstra_best_chan(dij, curidx);
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if (c->half[0].nodeidx == curidx) {
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(*hops)[num_hops].direction = 0;
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} else {
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assert(c->half[1].nodeidx == curidx);
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(*hops)[num_hops].direction = 1;
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}
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(*hops)[num_hops].scid = gossmap_chan_scid(gossmap, c);
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/* Find other end of channel. */
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next = gossmap_nth_node(gossmap, c, !(*hops)[num_hops].direction);
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gossmap_node_get_id(gossmap, next, &(*hops)[num_hops].node_id);
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/* These are (ab)used by others. */
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(*hops)[num_hops].blinding = NULL;
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(*hops)[num_hops].enctlv = NULL;
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if (!dijkstra_to_hops(hops, gossmap, dij, next, amount, cltv))
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return false;
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(*hops)[num_hops].amount = *amount;
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(*hops)[num_hops].delay = *cltv;
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h = &c->half[(*hops)[num_hops].direction];
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if (!amount_msat_add_fee(amount, h->base_fee, h->proportional_fee))
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/* Shouldn't happen, since we said it would route,
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* amounts must be sane. */
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abort();
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*cltv += h->delay;
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return true;
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}
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struct route_hop *route_from_dijkstra(const tal_t *ctx,
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const struct gossmap *map,
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const struct dijkstra *dij,
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const struct gossmap_node *src,
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struct amount_msat final_amount,
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u32 final_cltv)
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{
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struct route_hop *hops = tal_arr(ctx, struct route_hop, 0);
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if (!dijkstra_to_hops(&hops, map, dij, src, &final_amount, &final_cltv))
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return tal_free(hops);
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return hops;
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}
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