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annotate plugins/mod_http_openmetrics.lua @ 14179:25beb66fab38 13.0

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util.crypto: Use post-Lua 5.1 buffer API Tha Lua 5.1 buffer API was frustrating to work with. luaL_prepbuffer() only allocates LUAL_BUFFERSIZE - there is no way to request a specific size. LUAL_BUFFERSIZE is set to BUFSIZ by default, which is generally 8192 bytes on Linux, however it may vary between platforms. The variation means this buffer could potentially overflow (small BUFSIZ with large signature). The Lua 5.2+ buffer API enables requesting a specific buffer size, so that's what we do now.
author Matthew Wild <mwild1@gmail.com>
date Mon, 25 May 2026 15:11:47 +0100
parents 74b9e05af71e
children
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1 -- Export statistics in OpenMetrics format
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2 --
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3 -- Copyright (C) 2014 Daurnimator
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4 -- Copyright (C) 2018 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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5 -- Copyright (C) 2021 Jonas Schäfer <jonas@zombofant.net>
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6 --
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7 -- This module is MIT/X11 licensed.
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9 module:set_global();
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10
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11 local statsman = require "prosody.core.statsmanager";
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12 local ip = require "prosody.util.ip";
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14 local get_metric_registry = statsman.get_metric_registry;
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15 local collect = statsman.collect;
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16
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17 local get_metrics;
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19 local permitted_ips = module:get_option_set("openmetrics_allow_ips", { "::1", "127.0.0.1" });
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20 local permitted_cidr = module:get_option_string("openmetrics_allow_cidr");
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21
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22 local function is_permitted(request)
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23 local ip_raw = request.ip;
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24 if permitted_ips:contains(ip_raw) or
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25 (permitted_cidr and ip.match(ip.new_ip(ip_raw), ip.parse_cidr(permitted_cidr))) then
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26 return true;
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27 end
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28 return false;
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29 end
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31 function get_metrics(event)
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32 if not is_permitted(event.request) then
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33 return 403; -- Forbidden
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34 end
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35
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36 local response = event.response;
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37 response.headers.content_type = "application/openmetrics-text; version=0.0.4";
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38
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39 if collect then
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40 -- Ensure to get up-to-date samples when running in manual mode
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41 collect()
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42 end
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43
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44 local registry = get_metric_registry()
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45 if registry == nil then
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46 response.headers.content_type = "text/plain; charset=utf-8"
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47 response.status_code = 404
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48 return "No statistics provider configured\n"
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49 end
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50
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51 return registry:render();
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52 end
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53
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54 module:depends "http";
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55 module:provides("http", {
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56 default_path = "metrics";
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57 route = {
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58 GET = get_metrics;
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59 };
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60 });