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2be1f3fe1b
We're going to want this for bolt13 formation as well. As a result of reworking the logic into "candidate selection" then "route hint selection", we need to change the way round-robin works. We use a simple incrementing index now. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
#include <common/bolt11.h>
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#include <common/utils.h>
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#include <gossipd/gossipd_wiregen.h>
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#include <lightningd/log.h>
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#include <lightningd/peer_control.h>
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#include <lightningd/routehint.h>
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static void append_routes(struct route_info **dst, const struct route_info *src)
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{
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size_t n = tal_count(*dst);
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tal_resize(dst, n + tal_count(src));
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memcpy(*dst + n, src, tal_count(src) * sizeof(*src));
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}
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static void append_bools(bool **dst, const bool *src)
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{
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size_t n = tal_count(*dst);
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tal_resize(dst, n + tal_count(src));
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memcpy(*dst + n, src, tal_count(src) * sizeof(*src));
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}
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static bool scid_in_arr(const struct short_channel_id *scidarr,
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const struct short_channel_id *scid)
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{
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for (size_t i = 0; i < tal_count(scidarr); i++)
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if (short_channel_id_eq(&scidarr[i], scid))
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return true;
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return false;
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}
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struct routehint_candidate *
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routehint_candidates(const tal_t *ctx,
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struct lightningd *ld,
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const u8 *incoming_channels_reply,
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bool expose_all_private,
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const struct short_channel_id *hints,
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bool *none_public,
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bool *deadends,
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struct amount_msat *amount_offline)
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{
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struct routehint_candidate *candidates;
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struct route_info *inchans, *private;
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bool *inchan_deadends, *private_deadends;
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if (!fromwire_gossipd_get_incoming_channels_reply(tmpctx,
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incoming_channels_reply,
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&inchans,
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&inchan_deadends,
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&private,
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&private_deadends))
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fatal("Gossip gave bad GOSSIPD_GET_INCOMING_CHANNELS_REPLY %s",
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tal_hex(tmpctx, incoming_channels_reply));
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*none_public = (tal_count(inchans) == 0) && (tal_count(private) > 0);
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*deadends = false;
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/* fromwire explicitly makes empty arrays into NULL */
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if (!inchans) {
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inchans = tal_arr(tmpctx, struct route_info, 0);
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inchan_deadends = tal_arr(tmpctx, bool, 0);
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}
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if (expose_all_private) {
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append_routes(&inchans, private);
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append_bools(&inchan_deadends, private_deadends);
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} else if (hints) {
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/* Start by considering all channels as candidates */
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append_routes(&inchans, private);
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append_bools(&inchan_deadends, private_deadends);
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/* Consider only hints they gave */
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for (size_t i = 0; i < tal_count(inchans); i++) {
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if (!scid_in_arr(hints,
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&inchans[i].short_channel_id)) {
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tal_arr_remove(&inchans, i);
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tal_arr_remove(&inchan_deadends, i);
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i--;
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} else
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/* If they specify directly, we don't
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* care if it's a deadend */
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inchan_deadends[i] = false;
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}
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} else {
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assert(!hints);
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/* By default, only consider private channels if there are
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* no public channels *at all* */
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if (tal_count(inchans) == 0) {
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append_routes(&inchans, private);
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append_bools(&inchan_deadends, private_deadends);
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}
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}
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candidates = tal_arr(ctx, struct routehint_candidate, 0);
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*amount_offline = AMOUNT_MSAT(0);
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for (size_t i = 0; i < tal_count(inchans); i++) {
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struct peer *peer;
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struct routehint_candidate candidate;
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/* Do we know about this peer? */
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peer = peer_by_id(ld, &inchans[i].pubkey);
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if (!peer)
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continue;
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/* Does it have a channel in state CHANNELD_NORMAL */
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candidate.c = peer_normal_channel(peer);
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if (!candidate.c)
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continue;
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/* Is it a dead-end? */
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if (inchan_deadends[i]) {
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*deadends = true;
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continue;
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}
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candidate.capacity = channel_amount_receivable(candidate.c);
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/* Is it offline? */
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if (candidate.c->owner == NULL) {
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if (!amount_msat_add(amount_offline,
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*amount_offline,
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candidate.capacity))
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fatal("Overflow summing offline capacity!");
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continue;
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}
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candidate.r = &inchans[i];
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tal_arr_expand(&candidates, candidate);
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}
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return candidates;
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}
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