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annotate mod_prometheus/mod_prometheus.lua @ 3128:a34e7bd87b39

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mod_prometheus: Optimise global lookups.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Thu, 21 Jun 2018 22:15:15 +0200
parents 36770ae1148f
children ddd39ca7b953
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Log common stats to statsd
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2 --
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3 -- Copyright (C) 2014 Daurnimator
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4 --
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5 -- This module is MIT/X11 licensed.
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6
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7 module:set_global();
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8 module:depends "http";
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9
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10 local tostring = tostring;
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11 local s_format = string.format;
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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 mt = require "util.multitable";
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16
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17 local meta = mt.new(); meta.data = module:shared"meta";
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18 local data = mt.new(); data.data = module:shared"data";
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19
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20 local function escape(text)
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21 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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22 end
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23
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24 local function escape_name(name)
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25 return name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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26 end
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27
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28 local function get_timestamp()
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29 -- Using LuaSocket for that because os.time() only has second precision.
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30 return math.floor(socket.gettime() * 1000);
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31 end
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32
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33 local function repr_help(metric, docstring)
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34 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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35 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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36 end
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37
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38 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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39 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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40 local function repr_type(metric, type_)
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41 -- if not allowed_types:contains(type_) then
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42 -- return;
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43 -- end
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44 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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45 end
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46
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47 local function repr_label(key, value)
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48 return key.."=\""..escape(value).."\"";
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49 end
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50
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51 local function repr_labels(labels)
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52 local values = {}
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53 for key, value in pairs(labels) do
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54 t_insert(values, repr_label(escape_name(key), escape(value)));
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55 end
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56 if #values == 0 then
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57 return "";
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58 end
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59 return "{"..t_concat(values, ", ").."}";
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60 end
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61
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62 local function repr_sample(metric, labels, value, timestamp)
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63 return escape_name(metric)..repr_labels(labels).." "..value.." "..timestamp.."\n";
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64 end
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65
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66 module:hook("stats-updated", function (event)
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67 local all_stats, this = event.stats_extra;
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68 local host, sect, name, typ, key;
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69 for stat, value in pairs(event.changed_stats) do
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70 this = all_stats[stat];
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71 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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72 host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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73 if host == nil then
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74 sect, name, typ, host = stat:match("^([^.]+)%.([^:]+):(%a+)$");
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75 elseif host == "*" then
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76 host = nil;
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77 end
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78 if sect:find("^mod_measure_.") then
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79 sect = sect:sub(13);
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80 elseif sect:find("^mod_statistics_.") then
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81 sect = sect:sub(16);
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82 end
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83 key = escape_name(s_format("%s_%s_%s", host or "global", sect, typ));
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84
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85 if not meta:get(key) then
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86 if host then
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87 meta:set(key, "", "graph_title", s_format("%s %s on %s", sect, typ, host));
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88 else
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89 meta:set(key, "", "graph_title", s_format("Global %s %s", sect, typ, host));
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90 end
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91 meta:set(key, "", "graph_vlabel", this and this.units or typ);
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92 meta:set(key, "", "graph_category", sect);
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93
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94 meta:set(key, name, "label", name);
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95 elseif not meta:get(key, name, "label") then
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96 meta:set(key, name, "label", name);
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97 end
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98
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99 data:set(key, name, value);
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100 end
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101 end);
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102
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103 local function get_metrics(event)
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104 local response = event.response;
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105 response.headers.content_type = "text/plain; version=0.4.4";
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106
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107 local answer = {};
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108 local timestamp = tostring(get_timestamp());
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109 for section, content in pairs(data.data) do
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110 for key, value in pairs(content) do
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111 local name = "prosody_"..section.."_"..key;
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112 t_insert(answer, repr_help(name, "TODO: add a description here."));
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113 t_insert(answer, repr_type(name, "gauge"));
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114 t_insert(answer, repr_sample(name, {}, value, timestamp));
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115 end
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116 end
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117 return t_concat(answer, "");
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118 end
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119
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120 function module.add_host(module)
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121 module:provides("http", {
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122 default_path = "metrics";
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123 route = {
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124 GET = get_metrics;
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125 };
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126 });
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127 end