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paymod: Add a comment about how we derive errors from erring_index

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Mainly to help my future self remember
This commit is contained in:
Christian Decker
2020-07-19 21:31:41 +02:00
committed by Rusty Russell
parent b2463b12c0
commit 157e70ffe8
1 changed files with 16 additions and 0 deletions
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16
plugins/libplugin-pay.c
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@@ -684,6 +684,22 @@ payment_waitsendpay_finished(struct command *cmd, const char *buffer,
root = payment_root(p);
payment_chanhints_apply_route(p, true);
/* Either we have no erring_index, or it must be a correct index into
* p->route. From the docs:
*
* - *erring_index*: The index of the node along the route that
* reported the error. 0 for the local node, 1 for the first hop,
* and so on.
*
* The only difficulty is mapping the erring_index to the correct hop,
* since the hop consists of the processing node, but the payload for
* the next hop. In addition there is a class of onion-related errors
* that are reported by the previous hop to the one erring, since the
* erring node couldn't read the onion in the first place.
*/
assert(p->result->erring_index == NULL ||
*p->result->erring_index - 1 < tal_count(p->route));
switch (p->result->failcode) {
case WIRE_PERMANENT_CHANNEL_FAILURE:
case WIRE_CHANNEL_DISABLED: