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pay: Cleanup the route applicability checks for channel hints

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I previously mistyped the rather lengthy conditions for failures, so
let's dissect it into its smaller components and add rationale behind
the individual parts of the decision.
This commit is contained in:
Christian Decker 2020-11-16 14:19:18 +01:00 committed by Rusty Russell
parent 4d6b4a0445
commit 313976e2f4
1 changed files with 12 additions and 6 deletions
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18
plugins/libplugin-pay.c
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@ -470,6 +470,7 @@ static struct channel_hint *payment_chanhints_get(struct payment *p,
* prior application (`remove=true`). */
static bool payment_chanhints_apply_route(struct payment *p, bool remove)
{
bool apply;
struct route_hop *curhop;
struct channel_hint *curhint;
struct payment *root = payment_root(p);
@ -489,12 +490,17 @@ static bool payment_chanhints_apply_route(struct payment *p, bool remove)
if (!curhint)
continue;
/* A failure can happen if we add an HTLC, and either
* the local htlc_budget is exhausted, or the capacity
* is exceeded. */
if ((curhint->local && curhint->htlc_budget <= 0) ||
amount_msat_greater(curhop->amount,
curhint->estimated_capacity)) {
/* For local channels we check that we don't overwhelm
* them with too many HTLCs. */
apply = (!curhint->local) || curhint->htlc_budget > 0;
/* For all channels we check that they have a
* sufficiently large estimated capacity to have some
* chance of succeeding. */
apply &= amount_msat_greater(curhint->estimated_capacity,
curhop->amount);
if (!apply) {
/* This can happen in case of multiple
* concurrent getroute calls using the
* same channel_hints, no biggy, it's