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funder.c
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/* This is a plugin which allows you to specify
* your policy for accepting/dual-funding incoming
* v2 channel-open requests.
*
* "They say marriages are made in Heaven.
* But so is funder and lightning."
* - Clint Eastwood
* (because funder rhymes with thunder)
*
*/
#include "config.h"
#include <bitcoin/feerate.h>
#include <ccan/array_size/array_size.h>
#include <ccan/json_out/json_out.h>
#include <ccan/tal/str/str.h>
#include <common/json_stream.h>
#include <common/json_tok.h>
#include <common/memleak.h>
#include <common/overflows.h>
#include <common/psbt_open.h>
#include <common/type_to_string.h>
#include <plugins/funder_policy.h>
#include <plugins/libplugin.h>
/* In-progress channel opens */
static struct list_head pending_opens;
/* Current set policy */
static struct funder_policy *current_policy;
struct pending_open {
struct list_node list;
struct plugin *p;
struct node_id peer_id;
struct channel_id channel_id;
const struct wally_psbt *psbt;
};
static struct pending_open *
find_channel_pending_open(const struct channel_id *cid)
{
struct pending_open *open;
list_for_each(&pending_opens, open, list) {
if (channel_id_eq(&open->channel_id, cid))
return open;
}
return NULL;
}
static struct pending_open *
new_channel_open(const tal_t *ctx,
struct plugin *p,
const struct node_id id,
const struct channel_id cid,
const struct wally_psbt *psbt STEALS)
{
struct pending_open *open;
/* Make sure we haven't gotten this yet */
assert(!find_channel_pending_open(&cid));
open = tal(ctx, struct pending_open);
open->p = p;
open->peer_id = id;
open->channel_id = cid;
open->psbt = tal_steal(open, psbt);
list_add_tail(&pending_opens, &open->list);
return open;
}
static struct command_result *
unreserve_done(struct command *cmd UNUSED,
const char *buf,
const jsmntok_t *result,
struct pending_open *open)
{
plugin_log(open->p, LOG_DBG,
"`unreserveinputs` for channel %s completed. %*.s",
type_to_string(tmpctx, struct channel_id, &open->channel_id),
json_tok_full_len(result),
json_tok_full(buf, result));
tal_free(open);
return command_done();
}
/* Frees open (eventually, in unreserve_done callback) */
static void unreserve_psbt(struct pending_open *open)
{
struct out_req *req;
plugin_log(open->p, LOG_DBG,
"Calling `unreserveinputs` for channel %s",
type_to_string(tmpctx, struct channel_id,
&open->channel_id));
req = jsonrpc_request_start(open->p, NULL,
"unreserveinputs",
unreserve_done, unreserve_done,
open);
json_add_psbt(req->js, "psbt", open->psbt);
send_outreq(open->p, req);
/* We will free this in callback, but remove from list *now*
* to avoid calling twice! */
list_del_from(&pending_opens, &open->list);
notleak(open);
}
static void cleanup_peer_pending_opens(const struct node_id *id)
{
struct pending_open *i, *next;
list_for_each_safe(&pending_opens, i, next, list) {
if (node_id_eq(&i->peer_id, id)) {
unreserve_psbt(i);
}
}
}
static struct command_result *
command_hook_cont_psbt(struct command *cmd, struct wally_psbt *psbt)
{
struct json_stream *response;
response = jsonrpc_stream_success(cmd);
json_add_string(response, "result", "continue");
json_add_psbt(response, "psbt", psbt);
return command_finished(cmd, response);
}
static struct command_result *
signpsbt_done(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct pending_open *open)
{
struct wally_psbt *signed_psbt;
const char *err;
plugin_log(cmd->plugin, LOG_DBG,
"`signpsbt` done for channel %s",
type_to_string(tmpctx, struct channel_id,
&open->channel_id));
err = json_scan(tmpctx, buf, result,
"{signed_psbt:%}",
JSON_SCAN_TAL(cmd, json_to_psbt, &signed_psbt));
if (err)
plugin_err(cmd->plugin,
"`signpsbt` payload did not scan %s: %*.s",
err, json_tok_full_len(result),
json_tok_full(buf, result));
/* This finishes the open (successfully!) */
list_del_from(&pending_opens, &open->list);
tal_free(open);
return command_hook_cont_psbt(cmd, signed_psbt);
}
static struct command_result *
json_openchannel2_sign_call(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct channel_id cid;
struct wally_psbt *psbt;
const char *err;
struct out_req *req;
struct pending_open *open;
size_t count;
err = json_scan(tmpctx, buf, params,
"{openchannel2_sign:"
"{channel_id:%,psbt:%}}",
JSON_SCAN(json_to_channel_id, &cid),
JSON_SCAN_TAL(cmd, json_to_psbt, &psbt));
if (err)
plugin_err(cmd->plugin,
"`openchannel2_sign` payload did not scan %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
/* If we're not tracking this open, just pass through */
open = find_channel_pending_open(&cid);
if (!open) {
plugin_log(cmd->plugin, LOG_DBG,
"nothing to sign for channel %s",
type_to_string(tmpctx, struct channel_id, &cid));
return command_hook_cont_psbt(cmd, psbt);
}
if (!psbt_has_our_input(psbt)) {
plugin_log(cmd->plugin, LOG_DBG,
"no inputs to sign for channel %s",
type_to_string(tmpctx, struct channel_id, &cid));
return command_hook_cont_psbt(cmd, psbt);
}
plugin_log(cmd->plugin, LOG_DBG,
"openchannel_sign PSBT is %s",
type_to_string(tmpctx, struct wally_psbt, psbt));
req = jsonrpc_request_start(cmd->plugin, cmd,
"signpsbt",
&signpsbt_done,
&forward_error,
open);
json_add_psbt(req->js, "psbt", psbt);
/* Use input markers to identify which inputs
* are ours, only sign those */
json_array_start(req->js, "signonly");
count = 0;
for (size_t i = 0; i < psbt->num_inputs; i++) {
if (psbt_input_is_ours(&psbt->inputs[i])) {
json_add_num(req->js, NULL, i);
count++;
}
}
json_array_end(req->js);
plugin_log(cmd->plugin, LOG_DBG,
"calling `signpsbt` for channel %s for %zu input%s",
type_to_string(tmpctx, struct channel_id,
&open->channel_id), count,
count == 1 ? "" : "s");
return send_outreq(cmd->plugin, req);
}
static struct command_result *
json_openchannel2_changed_call(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct channel_id cid;
struct wally_psbt *psbt;
const char *err;
err = json_scan(tmpctx, buf, params,
"{openchannel2_changed:"
"{channel_id:%,psbt:%}}",
JSON_SCAN(json_to_channel_id, &cid),
JSON_SCAN_TAL(cmd, json_to_psbt, &psbt));
if (err)
plugin_err(cmd->plugin,
"`openchannel2_changed` payload did not"
" scan %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
plugin_log(cmd->plugin, LOG_DBG,
"openchannel_changed PSBT is %s",
type_to_string(tmpctx, struct wally_psbt, psbt));
/* FIXME: do we have any additions or updates to make based
* on their changes? */
/* For now, we assume we're the same as before and continue
* on as planned */
return command_hook_cont_psbt(cmd, psbt);
}
/* Tiny struct to pass info to callback for fundpsbt */
struct open_info {
struct channel_id cid;
struct node_id id;
struct amount_sat our_funding;
struct amount_sat their_funding;
struct amount_sat channel_max;
u64 funding_feerate_perkw;
u32 locktime;
u32 lease_blockheight;
u32 node_blockheight;
struct amount_sat requested_lease;
};
static struct open_info *new_open_info(const tal_t *ctx)
{
struct open_info *info = tal(ctx, struct open_info);
info->requested_lease = AMOUNT_SAT(0);
info->lease_blockheight = 0;
info->node_blockheight = 0;
return info;
}
static struct command_result *
psbt_funded(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct open_info *info)
{
struct wally_psbt *psbt;
struct json_stream *response;
struct amount_msat our_funding_msat;
const char *err;
err = json_scan(tmpctx, buf, result,
"{psbt:%}",
JSON_SCAN_TAL(tmpctx, json_to_psbt, &psbt));
if (err)
plugin_err(cmd->plugin,
"`fundpsbt` response did not scan %s: %.*s",
err, json_tok_full_len(result),
json_tok_full(buf, result));
/* We also mark all of our inputs as *ours*, so we
* can easily identify them for `signpsbt` later */
for (size_t i = 0; i < psbt->num_inputs; i++)
psbt_input_mark_ours(psbt, &psbt->inputs[i]);
new_channel_open(cmd->plugin, cmd->plugin,
info->id, info->cid, psbt);
if (!amount_sat_to_msat(&our_funding_msat, info->our_funding))
abort();
response = jsonrpc_stream_success(cmd);
json_add_string(response, "result", "continue");
json_add_psbt(response, "psbt", psbt);
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);
}
static struct command_result *
psbt_fund_failed(struct command *cmd,
const char *buf,
const jsmntok_t *error,
struct open_info *info)
{
/* Attempt to fund a psbt for this open failed.
* We probably ran out of funds (race?) */
plugin_log(cmd->plugin, LOG_INFORM,
"Unable to secure %s from wallet,"
" continuing channel open to %s"
" without our participation. err %.*s",
type_to_string(tmpctx, struct amount_sat,
&info->our_funding),
type_to_string(tmpctx, struct node_id,
&info->id),
json_tok_full_len(error),
json_tok_full(buf, error));
return command_hook_success(cmd);
}
static struct command_result *
listfunds_success(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct open_info *info)
{
struct amount_sat available_funds, est_fee;
const jsmntok_t *outputs_tok, *tok;
struct out_req *req;
size_t i;
const char *funding_err;
outputs_tok = json_get_member(buf, result, "outputs");
if (!outputs_tok)
plugin_err(cmd->plugin,
"`listfunds` payload has no outputs token: %*.s",
json_tok_full_len(result),
json_tok_full(buf, result));
available_funds = AMOUNT_SAT(0);
json_for_each_arr(i, tok, outputs_tok) {
struct amount_sat val;
bool is_reserved, is_p2sh;
char *status;
const char *err;
err = json_scan(tmpctx, buf, tok,
"{amount_msat:%"
",status:%"
",reserved:%}",
JSON_SCAN(json_to_sat, &val),
JSON_SCAN_TAL(cmd, json_strdup, &status),
JSON_SCAN(json_to_bool, &is_reserved));
if (err)
plugin_err(cmd->plugin,
"`listfunds` payload did not scan. %s: %*.s",
err, json_tok_full_len(result),
json_tok_full(buf, result));
/* is it a p2sh output? */
if (json_get_member(buf, tok, "redeemscript"))
is_p2sh = true;
else
is_p2sh = false;
/* The estimated fee per utxo. */
est_fee = amount_tx_fee(info->funding_feerate_perkw,
bitcoin_tx_input_weight(is_p2sh, 110));
/* we skip reserved funds */
if (is_reserved)
continue;
/* we skip unconfirmed+spent funds */
if (!streq(status, "confirmed"))
continue;
/* Don't include outputs that can't cover their weight;
* subtract the fee for this utxo out of the utxo */
if (!amount_sat_sub(&val, val, est_fee))
continue;
if (!amount_sat_add(&available_funds, available_funds, val))
plugin_err(cmd->plugin,
"`listfunds` overflowed output values");
}
funding_err = calculate_our_funding(current_policy,
info->id,
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",
funder_policy_desc(tmpctx, current_policy),
type_to_string(tmpctx, struct amount_sat,
&info->our_funding),
funding_err ? funding_err : "");
if (amount_sat_zero(info->our_funding))
return command_hook_success(cmd);
plugin_log(cmd->plugin, LOG_DBG,
"Funding channel %s with %s (their input %s)",
type_to_string(tmpctx, struct channel_id, &info->cid),
type_to_string(tmpctx, struct amount_sat,
&info->our_funding),
type_to_string(tmpctx, struct amount_sat,
&info->their_funding));
req = jsonrpc_request_start(cmd->plugin, cmd,
"fundpsbt",
&psbt_funded,
&psbt_fund_failed,
info);
json_add_string(req->js, "satoshi",
type_to_string(tmpctx, struct amount_sat,
&info->our_funding));
json_add_string(req->js, "feerate",
tal_fmt(tmpctx, "%"PRIu64"%s",
info->funding_feerate_perkw,
feerate_style_name(FEERATE_PER_KSIPA)));
/* Our startweight is zero because we're freeriding on their open
* transaction ! */
json_add_num(req->js, "startweight", 0);
json_add_num(req->js, "min_witness_weight", 110);
json_add_bool(req->js, "excess_as_change", true);
json_add_num(req->js, "locktime", info->locktime);
return send_outreq(cmd->plugin, req);
}
static struct command_result *
listfunds_failed(struct command *cmd,
const char *buf,
const jsmntok_t *error,
struct open_info *info)
{
/* Something went wrong fetching the funds info
* for our wallet. Just keep going */
plugin_log(cmd->plugin, LOG_INFORM,
"Unable to fetch wallet funds info."
" Continuing channel open to %s"
" without our participation. err %.*s",
type_to_string(tmpctx, struct node_id,
&info->id),
json_tok_full_len(error),
json_tok_full(buf, error));
return command_hook_success(cmd);
}
static struct command_result *
json_openchannel2_call(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct open_info *info = tal(cmd, struct open_info);
struct amount_msat max_htlc_inflight, htlc_minimum;
u64 commitment_feerate_perkw,
feerate_our_max, feerate_our_min;
u32 to_self_delay, max_accepted_htlcs;
u16 channel_flags;
const char *err;
struct out_req *req;
err = json_scan(tmpctx, buf, params,
"{openchannel2:"
"{id:%"
",channel_id:%"
",their_funding:%"
",max_htlc_value_in_flight_msat:%"
",htlc_minimum_msat:%"
",funding_feerate_per_kw:%"
",commitment_feerate_per_kw:%"
",feerate_our_max:%"
",feerate_our_min:%"
",to_self_delay:%"
",max_accepted_htlcs:%"
",channel_flags:%"
",locktime:%}}",
JSON_SCAN(json_to_node_id, &info->id),
JSON_SCAN(json_to_channel_id, &info->cid),
JSON_SCAN(json_to_sat, &info->their_funding),
JSON_SCAN(json_to_msat, &max_htlc_inflight),
JSON_SCAN(json_to_msat, &htlc_minimum),
JSON_SCAN(json_to_u64, &info->funding_feerate_perkw),
JSON_SCAN(json_to_u64, &commitment_feerate_perkw),
JSON_SCAN(json_to_u64, &feerate_our_max),
JSON_SCAN(json_to_u64, &feerate_our_min),
JSON_SCAN(json_to_u32, &to_self_delay),
JSON_SCAN(json_to_u32, &max_accepted_htlcs),
JSON_SCAN(json_to_u16, &channel_flags),
JSON_SCAN(json_to_u32, &info->locktime));
if (err)
plugin_err(cmd->plugin,
"`openchannel2` payload did not scan %s: %.*s",
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,
"{openchannel2:{channel_max_msat:%}}",
JSON_SCAN(json_to_sat, &info->channel_max));
if (err)
info->channel_max = AMOUNT_SAT(UINT64_MAX);
/* We don't fund anything that's above or below our feerate */
if (info->funding_feerate_perkw < feerate_our_min
|| info->funding_feerate_perkw > feerate_our_max) {
plugin_log(cmd->plugin, LOG_DBG,
"their feerate %"PRIu64" is out of"
" our bounds (%"PRIu64"-%"PRIu64")",
info->funding_feerate_perkw,
feerate_our_min,
feerate_our_max);
return command_hook_success(cmd);
}
/* If they've requested funds, but we're not actually
* supporting requested funds...*/
if (!current_policy->rates &&
!amount_sat_zero(info->requested_lease)) {
struct json_stream *res = jsonrpc_stream_success(cmd);
json_add_string(res, "result", "reject");
json_add_string(res, "error_message",
"Peer requested funds but we're not advertising"
" liquidity right now");
return command_finished(cmd, res);
}
/* 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",
&listfunds_success,
&listfunds_failed,
info);
return send_outreq(cmd->plugin, req);
}
/* Peer has asked us to RBF */
static struct command_result *
json_rbf_channel_call(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct open_info *info = new_open_info(cmd);
u64 feerate_our_max, feerate_our_min;
const char *err;
struct out_req *req;
err = json_scan(tmpctx, buf, params,
"{rbf_channel:"
"{id:%"
",channel_id:%"
",their_funding:%"
",funding_feerate_per_kw:%"
",feerate_our_max:%"
",feerate_our_min:%"
",locktime:%}}",
JSON_SCAN(json_to_node_id, &info->id),
JSON_SCAN(json_to_channel_id, &info->cid),
JSON_SCAN(json_to_sat, &info->their_funding),
JSON_SCAN(json_to_u64, &info->funding_feerate_perkw),
JSON_SCAN(json_to_u64, &feerate_our_max),
JSON_SCAN(json_to_u64, &feerate_our_min),
JSON_SCAN(json_to_u32, &info->locktime));
if (err)
plugin_err(cmd->plugin,
"`rbf_channel` payload did not scan %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
/* If there's no channel_max, it's actually infinity */
err = json_scan(tmpctx, buf, params,
"{rbf_channel:{channel_max_msat:%}}",
JSON_SCAN(json_to_sat, &info->channel_max));
if (err)
info->channel_max = AMOUNT_SAT(UINT64_MAX);
/* We don't fund anything that's above or below our feerate */
if (info->funding_feerate_perkw < feerate_our_min
|| info->funding_feerate_perkw > feerate_our_max) {
plugin_log(cmd->plugin, LOG_DBG,
"their feerate %"PRIu64" is out of"
" our bounds (%"PRIu64"-%"PRIu64")",
info->funding_feerate_perkw,
feerate_our_min,
feerate_our_max);
return command_hook_success(cmd);
}
/* Figure out what our funds are... same flow
* as with openchannel2 callback. We assume that THEY
* will use the same inputs, so we use whatever we want here */
req = jsonrpc_request_start(cmd->plugin, cmd,
"listfunds",
&listfunds_success,
&listfunds_failed,
info);
return send_outreq(cmd->plugin, req);
}
static struct command_result *json_disconnect(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct node_id id;
const char *err;
err = json_scan(tmpctx, buf, params,
"{id:%}",
JSON_SCAN(json_to_node_id, &id));
if (err)
plugin_err(cmd->plugin,
"`disconnect` notification payload did not"
" scan %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
plugin_log(cmd->plugin, LOG_DBG,
"Cleaning up inflights for peer id %s",
type_to_string(tmpctx, struct node_id, &id));
cleanup_peer_pending_opens(&id);
return notification_handled(cmd);
}
static struct command_result *json_channel_open_failed(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct channel_id cid;
struct pending_open *open;
const char *err;
err = json_scan(tmpctx, buf, params,
"{channel_open_failed:"
"{channel_id:%}}",
JSON_SCAN(json_to_channel_id, &cid));
if (err)
plugin_err(cmd->plugin,
"`channel_open_failed` notification payload did"
" not scan %s: %.*s",
err, json_tok_full_len(params),
json_tok_full(buf, params));
plugin_log(cmd->plugin, LOG_DBG,
"Cleaning up inflight for channel_id %s",
type_to_string(tmpctx, struct channel_id, &cid));
open = find_channel_pending_open(&cid);
if (open)
unreserve_psbt(open);
return notification_handled(cmd);
}
static void json_add_policy(struct json_stream *stream,
struct funder_policy *policy)
{
json_add_string(stream, "summary",
funder_policy_desc(stream, current_policy));
json_add_string(stream, "policy",
funder_opt_name(policy->opt));
json_add_num(stream, "policy_mod", policy->mod);
json_add_bool(stream, "leases_only", policy->leases_only);
json_add_amount_sat_only(stream, "min_their_funding_msat",
policy->min_their_funding);
json_add_amount_sat_only(stream, "max_their_funding_msat",
policy->max_their_funding);
json_add_amount_sat_only(stream, "per_channel_min_msat",
policy->per_channel_min);
json_add_amount_sat_only(stream, "per_channel_max_msat",
policy->per_channel_max);
json_add_amount_sat_only(stream, "reserve_tank_msat",
policy->reserve_tank);
json_add_num(stream, "fuzz_percent", policy->fuzz_factor);
json_add_num(stream, "fund_probability", policy->fund_probability);
if (policy->rates) {
json_add_lease_rates(stream, policy->rates);
json_add_string(stream, "compact_lease",
lease_rates_tohex(tmpctx, policy->rates));
}
}
static struct command_result *
param_funder_opt(struct command *cmd, const char *name,
const char *buffer, const jsmntok_t *tok,
enum funder_opt **opt)
{
char *opt_str, *err;
*opt = tal(cmd, enum funder_opt);
opt_str = tal_strndup(cmd, buffer + tok->start,
tok->end - tok->start);
err = funding_option(opt_str, *opt);
if (err)
return command_fail_badparam(cmd, name, buffer, tok, err);
return NULL;
}
static struct command_result *
param_policy_mod(struct command *cmd, const char *name,
const char *buffer, const jsmntok_t *tok,
u64 **mod)
{
struct amount_sat sats;
char *arg_str, *err;
*mod = tal(cmd, u64);
arg_str = tal_strndup(cmd, buffer + tok->start,
tok->end - tok->start);
err = u64_option(arg_str, *mod);
if (err) {
tal_free(err);
if (!parse_amount_sat(&sats, arg_str, strlen(arg_str)))
return command_fail_badparam(cmd, name,
buffer, tok, err);
**mod = sats.satoshis; /* Raw: convert to u64 */
}
return NULL;
}
static struct command_result *
parse_lease_rates(struct command *cmd, const char *buffer,
const jsmntok_t *tok,
struct funder_policy *policy,
struct funder_policy *current_policy,
u32 *lease_fee_basis,
struct amount_sat *lease_fee_sats,
u32 *funding_weight,
u32 *channel_fee_max_proportional_thousandths,
struct amount_msat *chan_fee_msats)
{
/* If there's already rates set, we start with those */
if (!lease_rates_empty(current_policy->rates))
policy->rates = tal_dup(policy, struct lease_rates,
current_policy->rates);
else if (lease_fee_basis
|| lease_fee_sats
|| funding_weight
|| channel_fee_max_proportional_thousandths
|| chan_fee_msats)
policy->rates = default_lease_rates(policy);
else
policy->rates = NULL;
/* Sometimes a local macro is neater than the alternative */
#define ASSIGN_OR_RETURN_FAIL(type, member) \
do { \
if (member && \
!assign_overflow_##type(&policy->rates->member, *member)) \
return command_fail_badparam(cmd, #member, \
buffer, tok, "overflow"); \
} while(0)
ASSIGN_OR_RETURN_FAIL(u16, lease_fee_basis);
ASSIGN_OR_RETURN_FAIL(u16, funding_weight);
ASSIGN_OR_RETURN_FAIL(u16, channel_fee_max_proportional_thousandths);
#undef ASSIGN_OR_RETURN_FAIL
if (chan_fee_msats
&& !assign_overflow_u32(&policy->rates->channel_fee_max_base_msat,
chan_fee_msats->millisatoshis /* Raw: conversion */)) {
return command_fail_badparam(cmd, "channel_fee_max_base_msat",
buffer, tok, "overflow");
}
if (lease_fee_sats
&& !assign_overflow_u32(&policy->rates->lease_fee_base_sat,
lease_fee_sats->satoshis /* Raw: conversion */)) {
return command_fail_badparam(cmd, "lease_fee_base_sat",
buffer, tok, "overflow");
}
return NULL;
}
static struct command_result *
leaserates_set(struct command *cmd, const char *buf,
const jsmntok_t *result,
struct funder_policy *policy)
{
struct json_stream *res;
/* Ok, we updated lightningd with latest info */
res = jsonrpc_stream_success(cmd);
json_add_policy(res, policy);
return command_finished(cmd, res);
}
static struct command_result *
json_funderupdate(struct command *cmd,
const char *buf,
const jsmntok_t *params)
{
struct amount_sat *min_their_funding, *max_their_funding,
*per_channel_min, *per_channel_max,
*reserve_tank, *lease_fee_sats;
struct amount_msat *channel_fee_msats;
u32 *fuzz_factor, *fund_probability, *chan_fee_ppt,
*lease_fee_basis, *funding_weight;
u64 *mod;
bool *leases_only;
enum funder_opt *opt;
const struct out_req *req;
const char *err;
struct command_result *res;
struct funder_policy *policy = tal(cmd, struct funder_policy);
if (!param(cmd, buf, params,
p_opt_def("policy", param_funder_opt, &opt,
current_policy->opt),
p_opt_def("policy_mod", param_policy_mod, &mod,
current_policy->mod),
p_opt_def("leases_only", param_bool, &leases_only,
current_policy->leases_only),
p_opt_def("min_their_funding_msat", param_sat,
&min_their_funding,
current_policy->min_their_funding),
p_opt_def("max_their_funding_msat", param_sat,
&max_their_funding,
current_policy->max_their_funding),
p_opt_def("per_channel_min_msat", param_sat,
&per_channel_min,
current_policy->per_channel_min),
p_opt_def("per_channel_max_msat", param_sat,
&per_channel_max,
current_policy->per_channel_max),
p_opt_def("reserve_tank_msat", param_sat, &reserve_tank,
current_policy->reserve_tank),
p_opt_def("fuzz_percent", param_number,
&fuzz_factor,
current_policy->fuzz_factor),
p_opt_def("fund_probability", param_number,
&fund_probability,
current_policy->fund_probability),
p_opt("lease_fee_base_msat", param_sat, &lease_fee_sats),
p_opt("lease_fee_basis", param_number, &lease_fee_basis),
p_opt("funding_weight", param_number, &funding_weight),
p_opt("channel_fee_max_base_msat", param_msat,
&channel_fee_msats),
p_opt("channel_fee_max_proportional_thousandths",
param_number, &chan_fee_ppt),
NULL))
return command_param_failed();
policy->opt = *opt;
policy->mod = *mod;
policy->min_their_funding = *min_their_funding;
policy->max_their_funding = *max_their_funding;
policy->per_channel_min = *per_channel_min;
policy->per_channel_max = *per_channel_max;
policy->reserve_tank = *reserve_tank;
policy->fuzz_factor = *fuzz_factor;
policy->fund_probability = *fund_probability;
policy->leases_only = *leases_only;
res = parse_lease_rates(cmd, buf, params,
policy, current_policy,
lease_fee_basis,
lease_fee_sats,
funding_weight,
chan_fee_ppt,
channel_fee_msats);
if (res)
return res;
err = funder_check_policy(policy);
if (err) {
tal_free(policy);
return command_done_err(cmd, JSONRPC2_INVALID_PARAMS,
err, NULL);
}
tal_free(current_policy);
current_policy = tal_steal(NULL, policy);
/* Update lightningd, also */
req = jsonrpc_request_start(cmd->plugin, cmd,
"setleaserates",
&leaserates_set,
&forward_error,
current_policy);
if (current_policy->rates)
json_add_lease_rates(req->js, current_policy->rates);
else {
/* Add empty rates to turn off */