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annotate mod_prometheus/mod_prometheus.lua @ 3138:9817e45a79e6

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mod_prometheus: Fetch statistics at every request.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Fri, 22 Jun 2018 15:19:55 +0200
parents 99ac6dda9878
children ccbfe7df02dc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Log statistics to Prometheus
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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 --
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6 -- This module is MIT/X11 licensed.
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7
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8 module:set_global();
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9 module:depends "http";
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10
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11 local tostring = tostring;
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12 local t_insert = table.insert;
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13 local t_concat = table.concat;
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14 local socket = require "socket";
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15 local get_stats = require "core.statsmanager".get_stats;
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16
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17 local function escape(text)
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18 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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19 end
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20
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21 local function escape_name(name)
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22 return name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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23 end
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24
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25 local function get_timestamp()
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26 -- Using LuaSocket for that because os.time() only has second precision.
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27 return math.floor(socket.gettime() * 1000);
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28 end
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29
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30 local function repr_help(metric, docstring)
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31 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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32 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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33 end
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34
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35 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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36 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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37 local function repr_type(metric, type_)
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38 -- if not allowed_types:contains(type_) then
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39 -- return;
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40 -- end
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41 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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42 end
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43
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44 local function repr_label(key, value)
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45 return key.."=\""..escape(value).."\"";
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46 end
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47
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48 local function repr_labels(labels)
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49 local values = {}
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50 for key, value in pairs(labels) do
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51 t_insert(values, repr_label(escape_name(key), escape(value)));
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52 end
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53 if #values == 0 then
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54 return "";
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55 end
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56 return "{"..t_concat(values, ", ").."}";
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57 end
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58
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59 local function repr_sample(metric, labels, value, timestamp)
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60 return escape_name(metric)..repr_labels(labels).." "..value.." "..timestamp.."\n";
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61 end
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62
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63 local function parse_stats()
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64 local timestamp = tostring(get_timestamp());
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65 local data = {};
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66 for stat, value in pairs(get_stats()) do
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67 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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68 local host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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69 if host == nil then
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70 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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71 elseif host == "*" then
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72 host = nil;
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73 end
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74 if sect:find("^mod_measure_.") then
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75 sect = sect:sub(13);
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76 elseif sect:find("^mod_statistics_.") then
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77 sect = sect:sub(16);
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78 end
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79
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80 local key = escape_name("prosody_"..sect);
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81 local field = {
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82 value = value,
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83 labels = { ["type"] = name},
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84 -- TODO: Use the other types where it makes sense.
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85 typ = (typ == "rate" and "counter" or "gauge"),
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86 timestamp = timestamp,
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87 };
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88 if host then
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89 field.labels.host = host;
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90 end
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91 if data[key] == nil then
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92 data[key] = {};
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93 end
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94 t_insert(data[key], field);
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95 end
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96 return data;
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97 end
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98
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99 local function get_metrics(event)
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100 local response = event.response;
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101 response.headers.content_type = "text/plain; version=0.0.4";
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102
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103 local answer = {};
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104 for key, fields in pairs(parse_stats()) do
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105 t_insert(answer, repr_help(key, "TODO: add a description here."));
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106 t_insert(answer, repr_type(key, fields[1].typ));
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107 for _, field in pairs(fields) do
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108 t_insert(answer, repr_sample(key, field.labels, field.value, field.timestamp));
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109 end
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110 end
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111 return t_concat(answer, "");
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112 end
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113
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114 function module.add_host(module)
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115 module:provides("http", {
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116 default_path = "metrics";
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117 route = {
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118 GET = get_metrics;
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119 };
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120 });
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121 end