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paymod: Teach the adaptive splitter to respect the HTLC limit

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There is little point in trying to split if the resulting HTLCs exceed the
maximum number of HTLCs we can add to our channels. So abort if a split would
result in more HTLCs than our channels can support.
This commit is contained in:
Christian Decker
2020-07-20 22:00:43 +02:00
committed by Rusty Russell
parent acdd9b8762
commit e92787a0e2
2 changed files with 51 additions and 11 deletions
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10
plugins/libplugin-pay.h
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@@ -328,13 +328,15 @@ struct direct_pay_data {
struct short_channel_id_dir *chan;
};
/* Since presplit and adaptive mpp modifiers share the same information we
* just use the same backing struct. Should they deviate we can create an
* adaptive_splitter_mod_data struct and populate that. */
struct presplit_mod_data {
bool disable;
};
struct adaptive_split_mod_data {
bool disable;
u32 htlc_budget;
};
/* List of globally available payment modifiers. */
REGISTER_PAYMENT_MODIFIER_HEADER(retry, struct retry_mod_data);
REGISTER_PAYMENT_MODIFIER_HEADER(routehints, struct routehints_data);
@@ -343,7 +345,7 @@ REGISTER_PAYMENT_MODIFIER_HEADER(shadowroute, struct shadow_route_data);
REGISTER_PAYMENT_MODIFIER_HEADER(directpay, struct direct_pay_data);
extern struct payment_modifier waitblockheight_pay_mod;
REGISTER_PAYMENT_MODIFIER_HEADER(presplit, struct presplit_mod_data);
REGISTER_PAYMENT_MODIFIER_HEADER(adaptive_splitter, struct presplit_mod_data);
REGISTER_PAYMENT_MODIFIER_HEADER(adaptive_splitter, struct adaptive_split_mod_data);
/* For the root payment we can seed the channel_hints with the result from
* `listpeers`, hence avoid channels that we know have insufficient capacity