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liquidity-ads: pipe through request to funder, update policy

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When a request comes through, we forward it over to the funder who
uses the currently set policy to figure out how to handle it.

Includes small update to the policy engine which decides whether or not
to fund a request.

Changelog-Experimental: Plugins: `openchannel2` hook now includes optional fields for a channel lease request
This commit is contained in:
niftynei
2021-06-08 16:42:45 -05:00
committed by neil saitug
parent 3a7b3762a1
commit f1b7e5fffe
9 changed files with 239 additions and 4 deletions
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58
plugins/funder.c
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@@ -282,6 +282,9 @@ struct open_info {
struct amount_sat channel_max;
u64 funding_feerate_perkw;
u32 locktime;
u32 lease_blockheight;
u32 node_blockheight;
struct amount_sat requested_lease;
};
static struct command_result *
@@ -322,6 +325,11 @@ psbt_funded(struct command *cmd,
json_add_amount_msat_only(response, "our_funding_msat",
our_funding_msat);
/* If we're accepting an lease request, *and* they've
* requested one, fill in our most recent infos */
if (current_policy->rates && !amount_sat_zero(info->requested_lease))
json_add_lease_rates(response, current_policy->rates);
return command_finished(cmd, response);
}
@@ -419,6 +427,7 @@ listfunds_success(struct command *cmd,
info->their_funding,
available_funds,
info->channel_max,
info->requested_lease,
&info->our_funding);
plugin_log(cmd->plugin, LOG_DBG,
"Policy %s returned funding amount of %s. %s",
@@ -531,6 +540,21 @@ json_openchannel2_call(struct command *cmd,
err, json_tok_full_len(params),
json_tok_full(buf, params));
err = json_scan(tmpctx, buf, params,
"{openchannel2:{"
"requested_lease_msat:%"
",lease_blockheight_start:%"
",node_blockheight:%}}",
JSON_SCAN(json_to_sat, &info->requested_lease),
JSON_SCAN(json_to_u32, &info->node_blockheight),
JSON_SCAN(json_to_u32, &info->lease_blockheight));
/* These aren't necessarily included */
if (err) {
info->requested_lease = AMOUNT_SAT(0);
info->node_blockheight = 0;
info->lease_blockheight = 0;
}
/* If there's no channel_max, it's actually infinity */
err = json_scan(tmpctx, buf, params,
@@ -553,6 +577,40 @@ json_openchannel2_call(struct command *cmd,
return command_hook_success(cmd);
}
/* Check that their block height isn't too far behind */
if (!amount_sat_zero(info->requested_lease)) {
u32 upper_bound, lower_bound;
/* BOLT- #2:
* The receiving node:
* - MAY fail the negotiation if: ...
* - if the `option_will_fund` tlv is present and:
* - the `blockheight` is considered too far in the
* past or future
*/
/* We consider 24 hrs too far out */
upper_bound = info->node_blockheight + 24 * 6;
lower_bound = info->node_blockheight - 24 * 6;
/* Check overflow */
if (upper_bound < info->node_blockheight)
upper_bound = -1;
if (lower_bound > info->node_blockheight)
lower_bound = 0;
if (upper_bound < info->lease_blockheight
|| lower_bound > info->lease_blockheight) {
plugin_log(cmd->plugin, LOG_DBG,
"their blockheight %d is out of"
" our bounds (ours is %d)",
info->lease_blockheight,
info->node_blockheight);
return command_hook_success(cmd);
}
}
/* Figure out what our funds are */
req = jsonrpc_request_start(cmd->plugin, cmd,
"listfunds",