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-- 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;
};
});
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