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pay: Retry the route computation if we could not apply the chanhints

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This adds a new state `PAYMENT_STEP_RETRY_GETROUTE` which is used to
retry just that one step, without spawning a completely new
attempt. It's a new state so that modifiers do not act on it twice.

Changelog-Fixed: pay: Improved the performance of the `pay` command considerably by avoiding conflicting changes to our local network view.
This commit is contained in:
Christian Decker
2020-11-11 17:49:51 +01:00
committed by Rusty Russell
parent 544e110c96
commit 4d6b4a0445
2 changed files with 18 additions and 1 deletions
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14
plugins/libplugin-pay.c
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@@ -1525,7 +1525,18 @@ static void payment_compute_onion_payloads(struct payment *p)
p->step = PAYMENT_STEP_ONION_PAYLOAD;
hopcount = tal_count(p->route);
payment_chanhints_apply_route(p, false);
/* Now that we are about to fix the route parameters by
* encoding them in an onion is the right time to update the
* channel hints. */
if (!payment_chanhints_apply_route(p, false)) {
/* We can still end up with a failed channel_hints
* update, either because a plugin changed the route,
* or because a modifier was not synchronous, allowing
* for multiple concurrent routes being built. If that
* is the case, discard this route and retry. */
payment_set_step(p, PAYMENT_STEP_RETRY_GETROUTE);
return payment_continue(p);
}
/* Now compute the payload we're about to pass to `createonion` */
cr = p->createonion_request = tal(p, struct createonion_request);
@@ -1873,6 +1884,7 @@ void payment_continue(struct payment *p)
p->current_modifier = -1;
switch (p->step) {
case PAYMENT_STEP_INITIALIZED:
case PAYMENT_STEP_RETRY_GETROUTE:
payment_getroute(p);
return;