Function getchaininfo

plugins/bcli.c:449–498

Get infos about the block chain. * Calls `getblockchaininfo` and returns headers count, blocks count, * the chain id, and whether this is initialblockdownload. */

 * the chain id, and whether this is initialblockdownload.
 */
static struct command_result *getchaininfo(struct command *cmd,
                                           const char *buf UNUSED,
                                           const jsmntok_t *toks UNUSED)
{
	/* FIXME(vincenzopalazzo): Inside the JSON request,
         * we have the current height known from Core Lightning. Therefore,
         * we can attempt to prevent a crash if the 'getchaininfo' function returns
         * a lower height than the one we already know, by waiting for a short period.
         * However, I currently don't have a better idea on how to handle this situation. */
	u32 *height UNUSED;
	struct bcli_result *res;
	const jsmntok_t *tokens;
	struct json_stream *response;
	bool ibd;
	u32 headers, blocks;
	const char *chain, *err;

	if (!param(cmd, buf, toks,
		   p_opt("last_height", param_number, &height),
		   NULL))
		return command_param_failed();

	res = run_bitcoin_cli(cmd, cmd->plugin, "getblockchaininfo", NULL);
	if (res->exitstatus != 0)
		return command_err(cmd, res, "command failed");

	tokens = json_parse_simple(res->output, res->output, res->output_len);
	if (!tokens)
		return command_err(cmd, res, "bad JSON: cannot parse");

	err = json_scan(tmpctx, res->output, tokens,
			"{chain:%,headers:%,blocks:%,initialblockdownload:%}",
			JSON_SCAN_TAL(tmpctx, json_strdup, &chain),
			JSON_SCAN(json_to_number, &headers),
			JSON_SCAN(json_to_number, &blocks),
			JSON_SCAN(json_to_bool, &ibd));
	if (err)
		return command_err(cmd, res, tal_fmt(tmpctx, "bad JSON: %s", err));

	if (bitcoind->dev_ignore_ibd)
		ibd = false;

	response = jsonrpc_stream_success(cmd);
	json_add_string(response, "chain", chain);
	json_add_u32(response, "headercount", headers);
	json_add_u32(response, "blockcount", blocks);
	json_add_bool(response, "ibd", ibd);

	return command_finished(cmd, response);
}

/* Add a feerate, but don't publish one that bitcoind won't accept. */
static void json_add_feerate(struct json_stream *result, const char *fieldname,