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-rw-r--r--plugins/mod_http_openmetrics.lua62
1 files changed, 62 insertions, 0 deletions
diff --git a/plugins/mod_http_openmetrics.lua b/plugins/mod_http_openmetrics.lua
new file mode 100644
index 00000000..78cd6fd4
--- /dev/null
+++ b/plugins/mod_http_openmetrics.lua
@@ -0,0 +1,62 @@
+-- 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
+
+function module.add_host(module)
+ module:depends "http";
+ module:provides("http", {
+ default_path = "metrics";
+ route = {
+ GET = get_metrics;
+ };
+ });
+end