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plugins/pay: fix capacity bias.

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With the warning that we were trying to put "inf" into a u64, we can
see that this calculation was wrong to use integers!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2023-04-01 14:12:23 +10:30
parent 1f8a4bed39
commit 37971fb61f
1 changed files with 3 additions and 2 deletions
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5
plugins/libplugin-pay.c
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@@ -729,13 +729,14 @@ static u64 capacity_bias(const struct gossmap *map,
struct amount_msat amount) struct amount_msat amount)
{ {
struct amount_sat capacity; struct amount_sat capacity;
u64 capmsat, amtmsat = amount.millisatoshis; /* Raw: lengthy math */ u64 amtmsat = amount.millisatoshis; /* Raw: lengthy math */
double capmsat;
/* Can fail in theory if gossmap changed underneath. */ /* Can fail in theory if gossmap changed underneath. */
if (!gossmap_chan_get_capacity(map, c, &capacity)) if (!gossmap_chan_get_capacity(map, c, &capacity))
return 0; return 0;
capmsat = capacity.satoshis * 1000; /* Raw: lengthy math */ capmsat = (double)capacity.satoshis * 1000; /* Raw: lengthy math */
return -log((capmsat + 1 - amtmsat) / (capmsat + 1)); return -log((capmsat + 1 - amtmsat) / (capmsat + 1));
} }