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209 lines
7.2 KiB
C
209 lines
7.2 KiB
C
#ifndef LIGHTNING_COMMON_GOSSMAP_H
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#define LIGHTNING_COMMON_GOSSMAP_H
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#include "config.h"
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#include <bitcoin/short_channel_id.h>
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#include <ccan/take/take.h>
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#include <ccan/typesafe_cb/typesafe_cb.h>
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#include <common/amount.h>
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#include <common/fp16.h>
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struct node_id;
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struct point32;
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struct gossmap_node {
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/* Offset in memory map for node_announce, or 0. */
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u32 nann_off;
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u32 num_chans;
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u32 *chan_idxs;
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};
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struct gossmap_chan {
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u32 cann_off;
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u32 private: 1;
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/* Technically redundant, but we have a hole anyway: from cann_off */
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u32 plus_scid_off: 31;
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/* Offsets of cupdates (0 if missing). Logically inside half_chan,
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* but that would add padding. */
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u32 cupdate_off[2];
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/* two nodes we connect (lesser idx first) */
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struct half_chan {
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/* Top bit indicates it's enabled */
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u32 enabled: 1;
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u32 nodeidx : 31;
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fp16_t htlc_min, htlc_max;
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/* millisatoshi. */
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u64 base_fee : 24;
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/* millionths */
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u64 proportional_fee : 20;
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/* Delay for HTLC in blocks. */
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u64 delay : 20;
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} half[2];
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};
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/* If num_channel_updates_rejected is not NULL, indicates how many channels we
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* marked inactive because their values were too high to be represented. */
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struct gossmap *gossmap_load(const tal_t *ctx, const char *filename,
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size_t *num_channel_updates_rejected);
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/* Call this before using to ensure it's up-to-date. Returns true if something
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* was updated. Note: this can scramble node and chan indexes! */
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bool gossmap_refresh(struct gossmap *map, size_t *num_channel_updates_rejected);
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/* Local modifications. */
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struct gossmap_localmods *gossmap_localmods_new(const tal_t *ctx);
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/* Create a local-only channel; if this conflicts with a real channel when added,
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* that will be used instead.
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* Returns false (and does nothing) if scid was already in localmods.
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*/
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bool gossmap_local_addchan(struct gossmap_localmods *localmods,
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const struct node_id *n1,
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const struct node_id *n2,
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const struct short_channel_id *scid,
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const u8 *features)
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NON_NULL_ARGS(1,2,3,4);
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/* Create a local-only channel_update: can apply to lcoal-only or
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* normal channels. Returns false if amounts don't fit in our
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* internal representation (implies channel unusable anyway). */
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bool gossmap_local_updatechan(struct gossmap_localmods *localmods,
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const struct short_channel_id *scid,
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struct amount_msat htlc_min,
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struct amount_msat htlc_max,
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u32 base_fee,
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u32 proportional_fee,
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u16 delay,
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bool enabled,
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int dir)
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NO_NULL_ARGS;
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/* Apply localmods to this map */
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void gossmap_apply_localmods(struct gossmap *map,
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struct gossmap_localmods *localmods);
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/* Remove localmods from this map */
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void gossmap_remove_localmods(struct gossmap *map,
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const struct gossmap_localmods *localmods);
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/* Each channel has a unique (low) index. */
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u32 gossmap_node_idx(const struct gossmap *map, const struct gossmap_node *node);
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u32 gossmap_chan_idx(const struct gossmap *map, const struct gossmap_chan *chan);
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/* Every node_idx/chan_idx will be < these.
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* These values can change across calls to gossmap_check. */
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u32 gossmap_max_node_idx(const struct gossmap *map);
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u32 gossmap_max_chan_idx(const struct gossmap *map);
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/* Find node with this node_id */
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struct gossmap_node *gossmap_find_node(const struct gossmap *map,
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const struct node_id *id);
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/* Find chan with this short_channel_id */
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struct gossmap_chan *gossmap_find_chan(const struct gossmap *map,
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const struct short_channel_id *scid);
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/* Get the short_channel_id of this chan */
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struct short_channel_id gossmap_chan_scid(const struct gossmap *map,
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const struct gossmap_chan *c);
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/* Given a struct node, get the node_id */
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void gossmap_node_get_id(const struct gossmap *map,
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const struct gossmap_node *node,
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struct node_id *id);
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/* Do we have any values for this halfchannel ? */
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static inline bool gossmap_chan_set(const struct gossmap_chan *chan, int dir)
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{
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return chan->cupdate_off[dir] != 0;
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}
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/* Return capacity if it's known (fails only on race condition) */
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bool gossmap_chan_get_capacity(const struct gossmap *map,
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const struct gossmap_chan *c,
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struct amount_sat *amount);
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/* Get the announcement msg which created this chan */
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u8 *gossmap_chan_get_announce(const tal_t *ctx,
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const struct gossmap *map,
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const struct gossmap_chan *c);
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/* Get the announcement msg (if any) for this node. */
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u8 *gossmap_node_get_announce(const tal_t *ctx,
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const struct gossmap *map,
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const struct gossmap_node *n);
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/* Return the feature bit (odd or even), or -1 if neither. */
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int gossmap_chan_get_feature(const struct gossmap *map,
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const struct gossmap_chan *c,
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int fbit);
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/* Return the feature bitmap */
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u8 *gossmap_chan_get_features(const tal_t *ctx,
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const struct gossmap *map,
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const struct gossmap_chan *c);
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/* Return the feature bit (odd or even), or -1 if neither (or no announcement) */
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int gossmap_node_get_feature(const struct gossmap *map,
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const struct gossmap_node *n,
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int fbit);
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/* Returns details from channel_update (must be gossmap_chan_set, and
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* does not work for local_updatechan! */
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void gossmap_chan_get_update_details(const struct gossmap *map,
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const struct gossmap_chan *chan,
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int dir,
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u32 *timestamp,
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u8 *message_flags,
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u8 *channel_flags,
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u32 *fee_base_msat,
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u32 *fee_proportional_millionths,
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struct amount_msat *htlc_minimum_msat,
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/* iff message_flags & 1 */
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struct amount_msat *htlc_maximum_msat);
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/* Given a struct node, get the nth channel, and tell us if we're half[0/1].
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* n must be less than node->num_chans */
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struct gossmap_chan *gossmap_nth_chan(const struct gossmap *map,
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const struct gossmap_node *node,
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u32 n,
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int *which_half);
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/* Given a struct chan, get the nth node, where n is 0 or 1. */
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struct gossmap_node *gossmap_nth_node(const struct gossmap *map,
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const struct gossmap_chan *chan,
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int n);
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/* Can this channel send this amount? */
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bool gossmap_chan_capacity(const struct gossmap_chan *chan,
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int direction,
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struct amount_msat amount);
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/* Remove a channel from the map (warning! realloc can move gossmap_chan
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* and gossmap_node ptrs!) */
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void gossmap_remove_chan(struct gossmap *map, struct gossmap_chan *chan);
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/* Remove node (by removing all its channels) */
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void gossmap_remove_node(struct gossmap *map, struct gossmap_node *node);
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/* Unsorted iterate through (do not add/remove channels or nodes!) */
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size_t gossmap_num_nodes(const struct gossmap *map);
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struct gossmap_node *gossmap_first_node(const struct gossmap *map);
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struct gossmap_node *gossmap_next_node(const struct gossmap *map,
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const struct gossmap_node *prev);
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/* Unsorted iterate through (do not add/remove channels or nodes!) */
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size_t gossmap_num_chans(const struct gossmap *map);
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struct gossmap_chan *gossmap_first_chan(const struct gossmap *map);
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struct gossmap_chan *gossmap_next_chan(const struct gossmap *map,
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struct gossmap_chan *prev);
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/* Each x-only pubkey has two possible values: we can figure out which by
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* examining the gossmap. */
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void gossmap_guess_node_id(const struct gossmap *map,
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const struct point32 *point32,
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struct node_id *id);
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#endif /* LIGHTNING_COMMON_GOSSMAP_H */
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