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102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
#ifndef LIGHTNING_BITCOIN_SHORT_CHANNEL_ID_H
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#define LIGHTNING_BITCOIN_SHORT_CHANNEL_ID_H
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#include "config.h"
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#include <ccan/compiler/compiler.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#include <common/gossip_constants.h>
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/* Short Channel ID is composed of 3 bytes for the block height, 3
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* bytes of tx index in block and 2 bytes of output index. */
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struct short_channel_id {
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u64 u64;
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};
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static inline bool short_channel_id_eq(struct short_channel_id a,
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struct short_channel_id b)
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{
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return a.u64 == b.u64;
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}
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static inline size_t short_channel_id_hash(struct short_channel_id scid)
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{
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/* scids cost money to generate, so simple hash works here */
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return (scid.u64 >> 32) ^ (scid.u64 >> 16) ^ scid.u64;
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}
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/* BOLT #7:
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*
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* - MUST set `node_id_1` and `node_id_2` to the public keys of the two nodes
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* operating the channel, such that `node_id_1` is the lexicographically-lesser of the
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* two compressed keys sorted in ascending lexicographic order.
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*...
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* - if the origin node is `node_id_1` in the message:
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* - MUST set the `direction` bit of `channel_flags` to 0.
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* - otherwise:
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* - MUST set the `direction` bit of `channel_flags` to 1.
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*/
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struct short_channel_id_dir {
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struct short_channel_id scid;
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/* 0 == from lesser id node, 1 == to lesser id node */
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int dir;
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};
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static inline bool short_channel_id_dir_eq(const struct short_channel_id_dir *a,
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const struct short_channel_id_dir *b)
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{
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return short_channel_id_eq(a->scid, b->scid) && a->dir == b->dir;
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}
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static inline u32 short_channel_id_blocknum(struct short_channel_id scid)
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{
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return scid.u64 >> 40;
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}
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static inline bool is_stub_scid(struct short_channel_id scid)
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{
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return scid.u64 >> 40 == 1 &&
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((scid.u64 >> 16) & 0x00FFFFFF) == 1 &&
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(scid.u64 & 0xFFFF) == 1;
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}
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static inline u32 short_channel_id_txnum(struct short_channel_id scid)
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{
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return (scid.u64 >> 16) & 0x00FFFFFF;
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}
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static inline u16 short_channel_id_outnum(struct short_channel_id scid)
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{
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return scid.u64 & 0xFFFF;
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}
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/* Subtly, at block N, depth is 1, hence the -1 here. eg. 103x1x0 is announceable
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* when height is 108. */
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static inline bool
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is_scid_depth_announceable(struct short_channel_id scid,
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unsigned int height)
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{
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return short_channel_id_blocknum(scid) + ANNOUNCE_MIN_DEPTH - 1
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<= height;
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}
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/* Returns false if blocknum, txnum or outnum require too many bits */
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bool WARN_UNUSED_RESULT mk_short_channel_id(struct short_channel_id *scid,
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u64 blocknum, u64 txnum, u64 outnum);
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bool WARN_UNUSED_RESULT short_channel_id_from_str(const char *str, size_t strlen,
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struct short_channel_id *dst);
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bool WARN_UNUSED_RESULT short_channel_id_dir_from_str(const char *str, size_t strlen,
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struct short_channel_id_dir *scidd);
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char *fmt_short_channel_id(const tal_t *ctx, struct short_channel_id scid);
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char *fmt_short_channel_id_dir(const tal_t *ctx,
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const struct short_channel_id_dir *scidd);
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/* Marshal/unmarshal */
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void towire_short_channel_id(u8 **pptr,
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struct short_channel_id short_channel_id);
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struct short_channel_id fromwire_short_channel_id(const u8 **cursor, size_t *max);
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#endif /* LIGHTNING_BITCOIN_SHORT_CHANNEL_ID_H */
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