Mercurial > prosody-modules

annotate mod_prometheus/mod_prometheus.lua @ 3866:c0df50ce96f0

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mod_rest: Handle internal http request errors early and then return Skips over attempted parsing of the payload which usually failed since the body is an error string like "connection refused", so this produced useless errors.
author Kim Alvefur <zash@zash.se>
date Sat, 25 Jan 2020 20:22:12 +0100
parents ccbfe7df02dc
children 343dc9dd70dd
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 allowed_extras = { min = true, max = true, average = true };
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64 local function insert_extras(data, key, name, timestamp, extra)
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65 if not extra then
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66 return false;
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67 end
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68 local has_extra = false;
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69 for extra_name in pairs(allowed_extras) do
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70 if extra[extra_name] then
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71 local field = {
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72 value = extra[extra_name],
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73 labels = {
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74 ["type"] = name,
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75 field = extra_name,
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76 },
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77 typ = "gauge";
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78 timestamp = timestamp,
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79 };
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80 t_insert(data[key], field);
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81 has_extra = true;
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82 end
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83 end
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84 return has_extra;
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85 end
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86
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87 local function parse_stats()
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88 local timestamp = tostring(get_timestamp());
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89 local data = {};
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90 local stats, changed_only, extras = get_stats();
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91 for stat, value in pairs(stats) do
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92 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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93 local extra = extras[stat];
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94 local host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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95 if host == nil then
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96 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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97 elseif host == "*" then
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98 host = nil;
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99 end
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100 if sect:find("^mod_measure_.") then
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101 sect = sect:sub(13);
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102 elseif sect:find("^mod_statistics_.") then
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103 sect = sect:sub(16);
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104 end
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105
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106 local key = escape_name("prosody_"..sect);
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107 local field = {
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108 value = value,
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109 labels = { ["type"] = name},
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110 -- TODO: Use the other types where it makes sense.
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111 typ = (typ == "rate" and "counter" or "gauge"),
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112 timestamp = timestamp,
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113 };
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114 if host then
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115 field.labels.host = host;
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116 end
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117 if data[key] == nil then
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118 data[key] = {};
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119 end
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120 if not insert_extras(data, key, name, timestamp, extra) then
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121 t_insert(data[key], field);
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122 end
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123 end
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124 return data;
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125 end
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126
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127 local function get_metrics(event)
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128 local response = event.response;
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129 response.headers.content_type = "text/plain; version=0.0.4";
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130
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131 local answer = {};
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132 for key, fields in pairs(parse_stats()) do
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133 t_insert(answer, repr_help(key, "TODO: add a description here."));
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134 t_insert(answer, repr_type(key, fields[1].typ));
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135 for _, field in pairs(fields) do
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136 t_insert(answer, repr_sample(key, field.labels, field.value, field.timestamp));
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137 end
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138 end
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139 return t_concat(answer, "");
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140 end
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141
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142 function module.add_host(module)
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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