prosody
21ed12cfe300
util/openmetrics.lua

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util/openmetrics.lua @ 12251:21ed12cfe300

util.pluginloader: Support for a per-file load filter Load filters can choose to block the loading of certain files, and optionally return some metadata about the loaded file.
author Matthew Wild <mwild1@gmail.com>
date Thu, 03 Feb 2022 12:56:52 +0000
parent 11929:85d51bfcf56b
child 12387:05c250fa335a
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1 --[[
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2 This module implements a subset of the OpenMetrics Internet Draft version 00.
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3
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4 URL: https://tools.ietf.org/html/draft-richih-opsawg-openmetrics-00
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5
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6 The following metric types are supported:
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7
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8 - Counter
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9 - Gauge
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10 - Histogram
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11 - Summary
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12
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13 It is used by util.statsd and util.statistics to provite the OpenMetrics API.
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14
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15 To understand what this module is about, it is useful to familiarize oneself
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16 with the terms MetricFamily, Metric, LabelSet, Label and MetricPoint as
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17 defined in the I-D linked above.
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18 --]]
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19 -- metric constructor interface:
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20 -- metric_ctor(..., family_name, labels, extra)
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21
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22 local time = require "util.time".now;
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23 local select = select;
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24 local array = require "util.array";
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25 local log = require "util.logger".init("util.openmetrics");
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26 local new_multitable = require "util.multitable".new;
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27 local iter_multitable = require "util.multitable".iter;
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28 local t_concat, t_insert = table.concat, table.insert;
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29 local t_pack, t_unpack = require "util.table".pack, table.unpack or unpack; --luacheck: ignore 113/unpack
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30
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31 -- BEGIN of Utility: "metric proxy"
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32 -- This allows to wrap a MetricFamily in a proxy which only provides the
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33 -- `with_labels` and `with_partial_label` methods. This allows to pre-set one
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34 -- or more labels on a metric family. This is used in particular via
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35 -- `with_partial_label` by the moduleapi in order to pre-set the `host` label
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36 -- on metrics created in non-global modules.
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37 local metric_proxy_mt = {}
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38 metric_proxy_mt.__index = metric_proxy_mt
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39
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40 local function new_metric_proxy(metric_family, with_labels_proxy_fun)
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41 return {
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42 _family = metric_family,
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43 with_labels = function(self, ...)
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44 return with_labels_proxy_fun(self._family, ...)
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45 end;
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46 with_partial_label = function(self, label)
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47 return new_metric_proxy(self._family, function(family, ...)
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48 return family:with_labels(label, ...)
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49 end)
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50 end
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51 }
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52 end
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53
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54 -- END of Utility: "metric proxy"
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55
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56 -- BEGIN Rendering helper functions (internal)
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57
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58 local function escape(text)
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59 return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
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60 end
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61
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62 local function escape_name(name)
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63 return name:gsub("/", "__"):gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1");
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64 end
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65
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66 local function repr_help(metric, docstring)
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67 docstring = docstring:gsub("\\", "\\\\"):gsub("\n", "\\n");
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68 return "# HELP "..escape_name(metric).." "..docstring.."\n";
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69 end
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70
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71 local function repr_unit(metric, unit)
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72 if not unit then
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73 unit = ""
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74 else
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75 unit = unit:gsub("\\", "\\\\"):gsub("\n", "\\n");
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76 end
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77 return "# UNIT "..escape_name(metric).." "..unit.."\n";
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78 end
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79
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80 -- local allowed_types = { counter = true, gauge = true, histogram = true, summary = true, untyped = true };
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81 -- local allowed_types = { "counter", "gauge", "histogram", "summary", "untyped" };
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82 local function repr_type(metric, type_)
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83 -- if not allowed_types:contains(type_) then
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84 -- return;
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85 -- end
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86 return "# TYPE "..escape_name(metric).." "..type_.."\n";
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87 end
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88
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89 local function repr_label(key, value)
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90 return key.."=\""..escape(value).."\"";
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91 end
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92
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93 local function repr_labels(labelkeys, labelvalues, extra_labels)
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94 local values = {}
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95 if labelkeys then
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96 for i, key in ipairs(labelkeys) do
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97 local value = labelvalues[i]
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98 t_insert(values, repr_label(escape_name(key), escape(value)));
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99 end
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100 end
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101 if extra_labels then
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102 for key, value in pairs(extra_labels) do
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103 t_insert(values, repr_label(escape_name(key), escape(value)));
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104 end
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105 end
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106 if #values == 0 then
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107 return "";
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108 end
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109 return "{"..t_concat(values, ",").."}";
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110 end
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111
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112 local function repr_sample(metric, labelkeys, labelvalues, extra_labels, value)
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113 return escape_name(metric)..repr_labels(labelkeys, labelvalues, extra_labels).." "..string.format("%.17g", value).."\n";
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114 end
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115
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116 -- END Rendering helper functions (internal)
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117
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118 local function render_histogram_le(v)
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119 if v == 1/0 then
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120 -- I-D-00: 4.1.2.2.1:
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121 -- Exposers MUST produce output for positive infinity as +Inf.
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122 return "+Inf"
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123 end
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124
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125 return string.format("%.14g", v)
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126 end
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127
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128 -- BEGIN of generic MetricFamily implementation
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129
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130 local metric_family_mt = {}
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131 metric_family_mt.__index = metric_family_mt
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132
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133 local function histogram_metric_ctor(orig_ctor, buckets)
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134 return function(family_name, labels, extra)
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135 return orig_ctor(buckets, family_name, labels, extra)
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136 end
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137 end
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138
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139 local function new_metric_family(backend, type_, family_name, unit, description, label_keys, extra)
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140 local metric_ctor = assert(backend[type_], "statistics backend does not support "..type_.." metrics families")
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141 local labels = label_keys or {}
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142 local user_labels = #labels
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143 if type_ == "histogram" then
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144 local buckets = extra and extra.buckets
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145 if not buckets then
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146 error("no buckets given for histogram metric")
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147 end
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148 buckets = array(buckets)
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149 buckets:push(1/0) -- must have +inf bucket
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150
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151 metric_ctor = histogram_metric_ctor(metric_ctor, buckets)
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152 end
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153
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154 local data
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155 if #labels == 0 then
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156 data = metric_ctor(family_name, nil, extra)
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157 else
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158 data = new_multitable()
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159 end
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160
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161 local mf = {
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162 family_name = family_name,
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163 data = data,
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164 type_ = type_,
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165 unit = unit,
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166 description = description,
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167 user_labels = user_labels,
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168 label_keys = labels,
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169 extra = extra,
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170 _metric_ctor = metric_ctor,
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171 }
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172 setmetatable(mf, metric_family_mt);
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173 return mf
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174 end
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175
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176 function metric_family_mt:new_metric(labels)
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177 return self._metric_ctor(self.family_name, labels, self.extra)
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178 end
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179
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180 function metric_family_mt:clear()
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181 for _, metric in self:iter_metrics() do
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182 metric:reset()
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183 end
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184 end
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185
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186 function metric_family_mt:with_labels(...)
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187 local count = select('#', ...)
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188 if count ~= self.user_labels then
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189 error("number of labels passed to with_labels does not match number of label keys")
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190 end
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191 if count == 0 then
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192 return self.data
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193 end
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194 local metric = self.data:get(...)
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195 if not metric then
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196 local values = t_pack(...)
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197 metric = self:new_metric(values)
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198 values[values.n+1] = metric
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199 self.data:set(t_unpack(values, 1, values.n+1))
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200 end
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201 return metric
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202 end
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203
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204 function metric_family_mt:with_partial_label(label)
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205 return new_metric_proxy(self, function (family, ...)
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206 return family:with_labels(label, ...)
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207 end)
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208 end
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209
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210 function metric_family_mt:iter_metrics()
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211 if #self.label_keys == 0 then
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212 local done = false
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213 return function()
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214 if done then
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215 return nil
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216 end
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217 done = true
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218 return {}, self.data
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219 end
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220 end
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221 local searchkeys = {};
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222 local nlabels = #self.label_keys
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223 for i=1,nlabels do
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224 searchkeys[i] = nil;
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225 end
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226 local it, state = iter_multitable(self.data, t_unpack(searchkeys, 1, nlabels))
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227 return function(_s)
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228 local label_values = t_pack(it(_s))
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229 if label_values.n == 0 then
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230 return nil, nil
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231 end
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232 local metric = label_values[label_values.n]
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233 label_values[label_values.n] = nil
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234 label_values.n = label_values.n - 1
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235 return label_values, metric
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236 end, state
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237 end
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238
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239 -- END of generic MetricFamily implementation
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240
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241 -- BEGIN of MetricRegistry implementation
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242
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243
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244 -- Helper to test whether two metrics are "equal".
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245 local function equal_metric_family(mf1, mf2)
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246 if mf1.type_ ~= mf2.type_ then
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247 return false
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248 end
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249 if #mf1.label_keys ~= #mf2.label_keys then
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250 return false
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251 end
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252 -- Ignoring unit here because in general it'll be part of the name anyway
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253 -- So either the unit was moved into/out of the name (which is a valid)
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254 -- thing to do on an upgrade or we would expect not to see any conflicts
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255 -- anyway.
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256 --[[
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257 if mf1.unit ~= mf2.unit then
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258 return false
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259 end
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260 ]]
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261 for i, key in ipairs(mf1.label_keys) do
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262 if key ~= mf2.label_keys[i] then
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263 return false
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264 end
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265 end
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266 return true
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267 end
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268
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269 -- If the unit is not empty, add it to the full name as per the I-D spec.
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270 local function compose_name(name, unit)
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271 local full_name = name
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272 if unit and unit ~= "" then
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273 full_name = full_name .. "_" .. unit
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274 end
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275 -- TODO: prohibit certain suffixes used by metrics if where they may cause
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276 -- conflicts
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277 return full_name
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278 end
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279
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280 local metric_registry_mt = {}
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281 metric_registry_mt.__index = metric_registry_mt
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282
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283 local function new_metric_registry(backend)
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284 local reg = {
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285 families = {},
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286 backend = backend,
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287 }
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288 setmetatable(reg, metric_registry_mt)
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289 return reg
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290 end
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291
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292 function metric_registry_mt:register_metric_family(name, metric_family)
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293 local existing = self.families[name];
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294 if existing then
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295 if not equal_metric_family(metric_family, existing) then
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296 -- We could either be strict about this, or replace the
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297 -- existing metric family with the new one.
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298 -- Being strict is nice to avoid programming errors /
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299 -- conflicts, but causes issues when a new version of a module
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300 -- is loaded.
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301 --
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302 -- We will thus assume that the new metric is the correct one;
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303 -- That is probably OK because unless you're reaching down into
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304 -- the util.openmetrics or core.statsmanager API, your metric
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305 -- name is going to be scoped to `prosody_mod_$modulename`
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306 -- anyway and the damage is thus controlled.
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307 --
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308 -- To make debugging such issues easier, we still log.
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309 log("debug", "replacing incompatible existing metric family %s", name)
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310 -- Below is the code to be strict.
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311 --error("conflicting declarations for metric family "..name)
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312 else
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313 return existing
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314 end
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315 end
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316 self.families[name] = metric_family
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317 return metric_family
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318 end
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319
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320 function metric_registry_mt:gauge(name, unit, description, labels, extra)
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321 name = compose_name(name, unit)
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322 local mf = new_metric_family(self.backend, "gauge", name, unit, description, labels, extra)
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323 mf = self:register_metric_family(name, mf)
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324 return mf
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325 end
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326
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327 function metric_registry_mt:counter(name, unit, description, labels, extra)
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328 name = compose_name(name, unit)
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329 local mf = new_metric_family(self.backend, "counter", name, unit, description, labels, extra)
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330 mf = self:register_metric_family(name, mf)
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331 return mf
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332 end
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333
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334 function metric_registry_mt:histogram(name, unit, description, labels, extra)
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diff changeset
335 name = compose_name(name, unit)
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diff changeset
336 local mf = new_metric_family(self.backend, "histogram", name, unit, description, labels, extra)
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diff changeset
337 mf = self:register_metric_family(name, mf)
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338 return mf
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339 end
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340
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341 function metric_registry_mt:summary(name, unit, description, labels, extra)
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342 name = compose_name(name, unit)
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343 local mf = new_metric_family(self.backend, "summary", name, unit, description, labels, extra)
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344 mf = self:register_metric_family(name, mf)
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345 return mf
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346 end
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347
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348 function metric_registry_mt:get_metric_families()
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349 return self.families
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350 end
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351
11929
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352 function metric_registry_mt:render()
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353 local answer = {};
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354 for metric_family_name, metric_family in pairs(self:get_metric_families()) do
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diff changeset
355 t_insert(answer, repr_help(metric_family_name, metric_family.description))
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356 t_insert(answer, repr_unit(metric_family_name, metric_family.unit))
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357 t_insert(answer, repr_type(metric_family_name, metric_family.type_))
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diff changeset
358 for labelset, metric in metric_family:iter_metrics() do
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diff changeset
359 for suffix, extra_labels, value in metric:iter_samples() do
85d51bfcf56b mod_http_openmetrics: Imported from prosody-modules mod_prometheus @df2246b15075
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diff changeset
360 t_insert(answer, repr_sample(metric_family_name..suffix, metric_family.label_keys, labelset, extra_labels, value))
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parents: 11600
diff changeset
361 end
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parents: 11600
diff changeset
362 end
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parents: 11600
diff changeset
363 end
85d51bfcf56b mod_http_openmetrics: Imported from prosody-modules mod_prometheus @df2246b15075
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parents: 11600
diff changeset
364 t_insert(answer, "# EOF\n")
85d51bfcf56b mod_http_openmetrics: Imported from prosody-modules mod_prometheus @df2246b15075
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diff changeset
365 return t_concat(answer, "");
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parents: 11600
diff changeset
366 end
85d51bfcf56b mod_http_openmetrics: Imported from prosody-modules mod_prometheus @df2246b15075
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diff changeset
367
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368 -- END of MetricRegistry implementation
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diff changeset
369
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diff changeset
370 -- BEGIN of general helpers for implementing high-level APIs on top of OpenMetrics
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diff changeset
371
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diff changeset
372 local function timed(metric)
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373 local t0 = time()
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diff changeset
374 local submitter = assert(metric.sample or metric.set, "metric type cannot be used with timed()")
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diff changeset
375 return function()
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diff changeset
376 local t1 = time()
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diff changeset
377 submitter(metric, t1-t0)
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diff changeset
378 end
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diff changeset
379 end
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380
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diff changeset
381 -- END of general helpers
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diff changeset
382
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diff changeset
383 return {
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diff changeset
384 new_metric_proxy = new_metric_proxy;
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diff changeset
385 new_metric_registry = new_metric_registry;
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diff changeset
386 render_histogram_le = render_histogram_le;
5f15ab7c6ae5 Statistics: Rewrite statistics backends to use OpenMetrics
Jonas Schäfer <jonas@wielicki.name>
parents: 10883
diff changeset
387 timed = timed;
6553
0e29c05c3503 util.statistics: New library for gathering various kinds of statistics
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
388 }