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funder: save utxos of signed txs to datastore

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We're going to need to know what utxos we used if we RBF this channel;
so we serialize our inputs and save them to the datastore under the channel_id.
This commit is contained in:
niftynei 2022-10-05 13:09:19 -05:00 • committed by Christian Decker
parent dc9e79c445
commit a5e9035e2e
1 changed files with 84 additions and 2 deletions
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86
plugins/funder.c
View file

@ -128,6 +128,83 @@ command_hook_cont_psbt(struct command *cmd, struct wally_psbt *psbt)
return command_finished(cmd, response);
}
static struct command_result *
datastore_add_fail(struct command *cmd,
const char *buf,
const jsmntok_t *error,
struct wally_psbt *signed_psbt)
{
/* Oops, something's broken */
plugin_log(cmd->plugin, LOG_BROKEN,
"`datastore` add failed: %*.s",
json_tok_full_len(error),
json_tok_full(buf, error));
return command_hook_cont_psbt(cmd, signed_psbt);
}
static struct command_result *
datastore_add_success(struct command *cmd,
const char *buf,
const jsmntok_t *result,
struct wally_psbt *signed_psbt)
{
const char *key, *err;
err = json_scan(tmpctx, buf, result,
"{key:%}",
JSON_SCAN_TAL(cmd, json_strdup, &key));
if (err)
plugin_err(cmd->plugin,
"`datastore` payload did not scan. %s: %*.s",
err, json_tok_full_len(result),
json_tok_full(buf, result));
/* We saved the infos! */
plugin_log(cmd->plugin, LOG_DBG,
"Saved utxos for channel (%s) to datastore",
key);
return command_hook_cont_psbt(cmd, signed_psbt);
}
static struct command_result *
remember_channel_utxos(struct command *cmd,
struct pending_open *open,
struct wally_psbt *signed_psbt)
{
struct out_req *req;
u8 *utxos_bin;
char *chan_key = tal_fmt(cmd, "funder/%s",
type_to_string(cmd, struct channel_id,
&open->channel_id));
req = jsonrpc_request_start(cmd->plugin, cmd,
"datastore",
&datastore_add_success,
&datastore_add_fail,
signed_psbt);
utxos_bin = tal_arr(cmd, u8, 0);
for (size_t i = 0; i < signed_psbt->tx->num_inputs; i++) {
struct bitcoin_outpoint outpoint;
/* Don't save peer's UTXOS */
if (!psbt_input_is_ours(&signed_psbt->inputs[i]))
continue;
wally_tx_input_get_outpoint(&signed_psbt->tx->inputs[i],
&outpoint);
towire_bitcoin_outpoint(&utxos_bin, &outpoint);
}
json_add_string(req->js, "key", chan_key);
/* We either update the existing or add a new one, nbd */
json_add_string(req->js, "mode", "create-or-replace");
json_add_hex(req->js, "hex", utxos_bin, tal_bytelen(utxos_bin));
return send_outreq(cmd->plugin, req);
}
static struct command_result *
signpsbt_done(struct command *cmd,
const char *buf,
@ -135,6 +212,7 @@ signpsbt_done(struct command *cmd,
struct pending_open *open)
{
struct wally_psbt *signed_psbt;
struct command_result *res;
const char *err;
plugin_log(cmd->plugin, LOG_DBG,
@ -151,11 +229,15 @@ signpsbt_done(struct command *cmd,
err, json_tok_full_len(result),
json_tok_full(buf, result));
/* This finishes the open (successfully!) */
/* Save the list of utxos to the datastore! We'll need
* them again if we rbf */
res = remember_channel_utxos(cmd, open, signed_psbt);
/* The in-flight open is done, let's clean it up! */
list_del_from(&pending_opens, &open->list);
tal_free(open);
return command_hook_cont_psbt(cmd, signed_psbt);
return res;
}
static struct command_result *