Function getrawblockbyheight

plugins/bcli.c:347–443

Get a raw block given its height. * Calls `getblockhash` then `getblock` to retrieve it from bitcoin_cli. * Will return early with null fields if block isn't known (yet). */

 * Will return early with null fields if block isn't known (yet).
 */
static struct command_result *getrawblockbyheight(struct command *cmd,
                                                  const char *buf,
                                                  const jsmntok_t *toks)
{
	struct bcli_result *res;
	struct json_stream *response;
	const char *block_hash;
	u32 *height;
	struct timemono first_error_time;
	bool first_error = true;
	int *peers = NULL;

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

	res = run_bitcoin_cli(cmd, cmd->plugin, "getblockhash",
			      tal_fmt(tmpctx, "%u", *height), NULL);

	if (res->exitstatus != 0) {
		return getrawblockbyheight_notfound(cmd);
	}

	strip_trailing_whitespace(res->output, res->output_len);
	if (strlen(res->output) != BLOCK_HASH_HEX_LEN)
		return command_err(cmd, res, "bad JSON: bad blockhash");

	block_hash = tal_strdup(cmd, res->output);

	for (;;) {
		res = run_bitcoin_cli(cmd, cmd->plugin, "getblock",
				      block_hash, "0", NULL);

		if (res->exitstatus == 0) {
			strip_trailing_whitespace(res->output, res->output_len);
			response = jsonrpc_stream_success(cmd);
			json_add_string(response, "blockhash", block_hash);
			json_add_string(response, "block", res->output);
			return command_finished(cmd, response);
		}

		plugin_log(cmd->plugin, LOG_DBG,
			"failed to fetch block %s from the bitcoin backend (maybe pruned).",
			block_hash);

		if (first_error) {
			first_error_time = time_mono();
			first_error = false;
		}

		struct timerel elapsed = timemono_between(time_mono(), first_error_time);
		if (time_greater(elapsed, time_from_sec(bitcoind->retry_timeout))) {
			return command_done_err(cmd, BCLI_ERROR,
				tal_fmt(cmd, "getblock %s timed out after %"PRIu64" seconds",
					block_hash, bitcoind->retry_timeout), NULL);
		}