File

+
−-- Export statistics in OpenMetrics format
+
−--
+
−-- Copyright (C) 2014 Daurnimator
+
−-- Copyright (C) 2018 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+
−-- Copyright (C) 2021 Jonas Schäfer <jonas@zombofant.net>
+
−--
+
−-- This module is MIT/X11 licensed.
+
−
+
−module:set_global();
+
−
+
−local statsman = require "core.statsmanager";
+
−local ip = require "util.ip";
+
−
+
−local get_metric_registry = statsman.get_metric_registry;
+
−local collect = statsman.collect;
+
−
+
−local get_metrics;
+
−
+
−local permitted_ips = module:get_option_set("openmetrics_allow_ips", { "::1", "127.0.0.1" });
+
−local permitted_cidr = module:get_option_string("openmetrics_allow_cidr");
+
−
+
−local function is_permitted(request)
+
−	local ip_raw = request.ip;
+
−	if permitted_ips:contains(ip_raw) or
+
−	   (permitted_cidr and ip.match(ip.new_ip(ip_raw), ip.parse_cidr(permitted_cidr))) then
+
−		return true;
+
−	end
+
−	return false;
+
−end
+
−
+
−function get_metrics(event)
+
−	if not is_permitted(event.request) then
+
−		return 403; -- Forbidden
+
−	end
+
−
+
−	local response = event.response;
+
−	response.headers.content_type = "application/openmetrics-text; version=0.0.4";
+
−
+
−	if collect then
+
−		-- Ensure to get up-to-date samples when running in manual mode
+
−		collect()
+
−	end
+
−
+
−	local registry = get_metric_registry()
+
−	if registry == nil then
+
−		response.headers.content_type = "text/plain; charset=utf-8"
+
−		response.status_code = 404
+
−		return "No statistics provider configured\n"
+
−	end
+
−
+
−	return registry:render();
+
−end
+
−
+
−module:depends "http";
+
−module:provides("http", {
+
−	default_path = "metrics";
+
−	route = {
+
−		GET = get_metrics;
+
−	};
+
−});