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plugin: Add reserve to openchannel hook result

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Changelog-Added: plugin: The `openchannel` hook may return a custom absolute `reserve` value that the peer must not dip below.
This commit is contained in:
Christian Decker 2022-06-08 13:54:18 +02:00
parent 5c1de8029a
commit 9a97f8c154
2 changed files with 28 additions and 1 deletions
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18
doc/PLUGINS.md
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@ -1198,13 +1198,29 @@ e.g.
{
"result": "continue",
"close_to": "bc1qlq8srqnz64wgklmqvurv7qnr4rvtq2u96hhfg2"
"mindepth": 0,
"reserve": "1234sat"
}
```
Note that `close_to` must be a valid address for the current chain,
an invalid address will cause the node to exit with an error.
Note that `openchannel` is a chained hook. Therefore `close_to` will only be
- `mindepth` is the number of confirmations to require before making
the channel usable. Notice that setting this to 0 (`zeroconf`) or
some other low value might expose you to double-spending issues, so
only lower this value from the default if you trust the peer not to
double-spend, or you reject incoming payments, including forwards,
until the funding is confirmed.
- `reserve` is an absolute value for the amount in the channel that
the peer must keep on their side. This ensures that they always
have something to lose, so only lower this below the 1% of funding
amount if you trust the peer. The protocol requires this to be
larger than the dust limit, hence it will be adjusted to be the
dust limit if the specified value is below.
Note that `openchannel` is a chained hook. Therefore `close_to`, `reserve` will only be
evaluated for the first plugin that sets it. If more than one plugin tries to
set a `close_to` address an error will be logged.

11
lightningd/opening_control.c
View file

@ -732,6 +732,7 @@ openchannel_hook_deserialize(struct openchannel_hook_payload *payload,
const jsmntok_t *t_errmsg = json_get_member(buffer, toks, "error_message");
const jsmntok_t *t_closeto = json_get_member(buffer, toks, "close_to");
const jsmntok_t *t_mindepth = json_get_member(buffer, toks, "mindepth");
const jsmntok_t *t_reserve = json_get_member(buffer, toks, "reserve");
if (!t_result)
fatal("Plugin returned an invalid response to the"
@ -793,6 +794,16 @@ openchannel_hook_deserialize(struct openchannel_hook_payload *payload,
payload->uc->minimum_depth);
}
if (t_reserve != NULL) {
payload->uc->reserve = tal(payload->uc, struct amount_sat);
json_to_sat(buffer, t_reserve, payload->uc->reserve);
log_debug(openingd->ld->log,
"Setting reserve=%s for this channel as requested by "
"the openchannel hook",
type_to_string(tmpctx, struct amount_sat,
payload->uc->reserve));
}
return true;
}