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annotate mod_prometheus/mod_prometheus.lua @ 3952:343dc9dd70dd

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mod_prometheus: Ensure mod_http is loaded where the http interface is exposed (thanks Martin) Loading mod_http globally does not have the desired effect, it needs to be loaded in the host context where module:provides is called.
author Kim Alvefur <zash@zash.se>
date Sat, 21 Mar 2020 18:05:22 +0100
parents ccbfe7df02dc
children fb4a50bf60f1
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
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10 local tostring = tostring;
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11 local t_insert = table.insert;
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12 local t_concat = table.concat;
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13 local socket = require "socket";
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14 local get_stats = require "core.statsmanager".get_stats;
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15
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16 local function escape(text)
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17 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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18 end
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19
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20 local function escape_name(name)
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21 return name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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22 end
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23
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24 local function get_timestamp()
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25 -- Using LuaSocket for that because os.time() only has second precision.
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26 return math.floor(socket.gettime() * 1000);
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27 end
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28
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29 local function repr_help(metric, docstring)
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30 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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31 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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32 end
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33
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34 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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35 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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36 local function repr_type(metric, type_)
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37 -- if not allowed_types:contains(type_) then
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38 -- return;
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39 -- end
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40 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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41 end
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42
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43 local function repr_label(key, value)
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44 return key.."=\""..escape(value).."\"";
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45 end
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46
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47 local function repr_labels(labels)
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48 local values = {}
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49 for key, value in pairs(labels) do
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50 t_insert(values, repr_label(escape_name(key), escape(value)));
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51 end
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52 if #values == 0 then
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53 return "";
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54 end
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55 return "{"..t_concat(values, ", ").."}";
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56 end
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57
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58 local function repr_sample(metric, labels, value, timestamp)
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59 return escape_name(metric)..repr_labels(labels).." "..value.." "..timestamp.."\n";
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60 end
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61
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62 local allowed_extras = { min = true, max = true, average = true };
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63 local function insert_extras(data, key, name, timestamp, extra)
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64 if not extra then
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65 return false;
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66 end
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67 local has_extra = false;
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68 for extra_name in pairs(allowed_extras) do
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69 if extra[extra_name] then
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70 local field = {
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71 value = extra[extra_name],
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72 labels = {
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73 ["type"] = name,
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74 field = extra_name,
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75 },
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76 typ = "gauge";
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77 timestamp = timestamp,
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78 };
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79 t_insert(data[key], field);
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80 has_extra = true;
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81 end
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82 end
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83 return has_extra;
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84 end
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85
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86 local function parse_stats()
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87 local timestamp = tostring(get_timestamp());
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88 local data = {};
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89 local stats, changed_only, extras = get_stats();
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90 for stat, value in pairs(stats) do
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91 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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92 local extra = extras[stat];
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93 local host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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94 if host == nil then
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95 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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96 elseif host == "*" then
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97 host = nil;
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98 end
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99 if sect:find("^mod_measure_.") then
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100 sect = sect:sub(13);
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101 elseif sect:find("^mod_statistics_.") then
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102 sect = sect:sub(16);
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103 end
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104
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105 local key = escape_name("prosody_"..sect);
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106 local field = {
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107 value = value,
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108 labels = { ["type"] = name},
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109 -- TODO: Use the other types where it makes sense.
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110 typ = (typ == "rate" and "counter" or "gauge"),
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111 timestamp = timestamp,
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112 };
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113 if host then
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114 field.labels.host = host;
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115 end
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116 if data[key] == nil then
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117 data[key] = {};
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118 end
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119 if not insert_extras(data, key, name, timestamp, extra) then
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120 t_insert(data[key], field);
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121 end
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122 end
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123 return data;
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124 end
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125
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126 local function get_metrics(event)
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127 local response = event.response;
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128 response.headers.content_type = "text/plain; version=0.0.4";
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129
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130 local answer = {};
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131 for key, fields in pairs(parse_stats()) do
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132 t_insert(answer, repr_help(key, "TODO: add a description here."));
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133 t_insert(answer, repr_type(key, fields[1].typ));
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134 for _, field in pairs(fields) do
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135 t_insert(answer, repr_sample(key, field.labels, field.value, field.timestamp));
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136 end
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137 end
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138 return t_concat(answer, "");
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139 end
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140
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141 function module.add_host(module)
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142 module:depends "http";
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143 module:provides("http", {
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144 default_path = "metrics";
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145 route = {
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146 GET = get_metrics;
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147 };
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148 });
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149 end