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79 lines
1.9 KiB
79 lines
1.9 KiB
#include "commit_tx.h"
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#include "output_to_htlc.h"
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#include "peer.h"
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/* FIXME: Array makes this O(n^2). Use a hash table. */
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struct wscript_by_wpkh {
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struct htlc *h;
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const u8 *wscript;
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struct sha256 hash;
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};
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struct htlc_output_map {
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struct wscript_by_wpkh *wpkh;
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};
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struct htlc_output_map *get_htlc_output_map(const tal_t *ctx,
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const struct peer *peer,
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const struct sha256 *rhash,
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enum side side,
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unsigned int commit_num)
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{
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struct htlc_map_iter it;
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struct htlc *h;
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size_t i;
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struct htlc_output_map *omap = tal(ctx, struct htlc_output_map);
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/* FIXME: use commit_num to filter htlcs. */
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if (side == LOCAL)
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assert(commit_num <= peer->local.commit->commit_num);
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else
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assert(commit_num <= peer->remote.commit->commit_num);
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omap->wpkh = tal_arr(omap, struct wscript_by_wpkh,
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htlc_map_count(&peer->htlcs));
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for (i = 0, h = htlc_map_first(&peer->htlcs, &it);
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h;
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h = htlc_map_next(&peer->htlcs, &it)) {
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omap->wpkh[i].h = h;
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omap->wpkh[i].wscript = wscript_for_htlc(omap, peer, h, rhash,
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side);
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sha256(&omap->wpkh[i].hash,
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omap->wpkh[i].wscript,
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tal_count(omap->wpkh[i].wscript));
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i++;
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}
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tal_resize(&omap->wpkh, i);
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return omap;
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}
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static struct wscript_by_wpkh *get_wpkh(struct htlc_output_map *omap,
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const u8 *script, size_t script_len)
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{
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size_t i;
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if (!is_p2wsh(script, script_len))
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return NULL;
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for (i = 0; i < tal_count(omap->wpkh); i++) {
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if (!memcmp(script + 2, omap->wpkh[i].hash.u.u8,
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sizeof(omap->wpkh[i].hash)))
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return &omap->wpkh[i];
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}
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return NULL;
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}
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/* Which wscript does this pay to? */
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struct htlc *txout_get_htlc(struct htlc_output_map *omap,
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const u8 *script, size_t script_len,
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const u8 **wscript)
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{
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struct wscript_by_wpkh *wpkh = get_wpkh(omap, script, script_len);
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if (wpkh) {
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*wscript = wpkh->wscript;
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return wpkh->h;
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}
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return NULL;
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}
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