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paymod: Implement legacy onion payload computation

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This is just for testing for now, TLV payload computation will come next. We
stage all the payloads in deserialized form so modifiers can modify them more
easily and serialize them only before actually calling `createonion`.
This commit is contained in:
Christian Decker
2020-05-14 15:22:49 +02:00
parent 9d36e49770
commit 5f32cfe9cd
2 changed files with 77 additions and 0 deletions
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54
plugins/libplugin-pay.c
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@@ -162,7 +162,61 @@ static void payment_getroute(struct payment *p)
static void payment_compute_onion_payloads(struct payment *p)
{
struct createonion_request *cr;
size_t hopcount;
static struct short_channel_id all_zero_scid;
struct createonion_hop *cur;
p->step = PAYMENT_STEP_ONION_PAYLOAD;
hopcount = tal_count(p->route);
/* Now compute the payload we're about to pass to `createonion` */
cr = p->createonion_request = tal(p, struct createonion_request);
cr->assocdata = tal_arr(cr, u8, 0);
towire_sha256(&cr->assocdata, p->payment_hash);
cr->session_key = NULL;
cr->hops = tal_arr(cr, struct createonion_hop, tal_count(p->route));
/* Non-final hops */
for (size_t i = 0; i < hopcount - 1; i++) {
/* The message is destined for hop i, but contains fields for
* i+1 */
cur = &cr->hops[i];
cur->style = p->route[i].style;
cur->pubkey = p->route[i].nodeid;
switch (cur->style) {
case ROUTE_HOP_LEGACY:
cur->legacy_payload =
tal(cr->hops, struct legacy_payload);
cur->legacy_payload->forward_amt =
p->route[i + 1].amount;
cur->legacy_payload->scid = p->route[i + 1].channel_id;
cur->legacy_payload->outgoing_cltv =
p->start_block + p->route[i + 1].delay;
break;
case ROUTE_HOP_TLV:
/* TODO(cdecker) Implement */
abort();
}
}
/* Final hop */
cur = &cr->hops[hopcount - 1];
cur->style = p->route[hopcount - 1].style;
cur->pubkey = p->route[hopcount - 1].nodeid;
switch (cur->style) {
case ROUTE_HOP_LEGACY:
cur->legacy_payload = tal(cr->hops, struct legacy_payload);
cur->legacy_payload->forward_amt =
p->route[hopcount - 1].amount;
cur->legacy_payload->scid = all_zero_scid;
cur->legacy_payload->outgoing_cltv =
p->start_block + p->route[hopcount - 1].delay;
break;
case ROUTE_HOP_TLV:
/* TODO(cdecker) Implement */
abort();
}
/* Now allow all the modifiers to mess with the payloads, before we
* serialize via a call to createonion in the next step. */
payment_continue(p);