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util/openmetrics.lua

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util/openmetrics.lua @ 11768:aa6ab07544c2

mod_pubsub: Add support for limiting result size #1608
author Kim Alvefur <zash@zash.se>
date Sun, 05 Sep 2021 16:43:41 +0200
parent 11600:a02c277eb97a
child 11929:85d51bfcf56b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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_pack, t_unpack = require "util.table".pack, table.unpack or unpack; --luacheck: ignore 113/unpack
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30 -- BEGIN of Utility: "metric proxy"
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31 -- This allows to wrap a MetricFamily in a proxy which only provides the
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32 -- `with_labels` and `with_partial_label` methods. This allows to pre-set one
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33 -- or more labels on a metric family. This is used in particular via
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34 -- `with_partial_label` by the moduleapi in order to pre-set the `host` label
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35 -- on metrics created in non-global modules.
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36 local metric_proxy_mt = {}
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37 metric_proxy_mt.__index = metric_proxy_mt
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38
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39 local function new_metric_proxy(metric_family, with_labels_proxy_fun)
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40 return {
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41 _family = metric_family,
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42 with_labels = function(self, ...)
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43 return with_labels_proxy_fun(self._family, ...)
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44 end;
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45 with_partial_label = function(self, label)
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46 return new_metric_proxy(self._family, function(family, ...)
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47 return family:with_labels(label, ...)
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48 end)
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49 end
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50 }
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51 end
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52
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53 -- END of Utility: "metric proxy"
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54
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55 local function render_histogram_le(v)
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56 if v == 1/0 then
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57 -- I-D-00: 4.1.2.2.1:
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58 -- Exposers MUST produce output for positive infinity as +Inf.
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59 return "+Inf"
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60 end
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61
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62 return string.format("%.14g", v)
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63 end
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64
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65 -- BEGIN of generic MetricFamily implementation
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66
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67 local metric_family_mt = {}
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68 metric_family_mt.__index = metric_family_mt
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69
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70 local function histogram_metric_ctor(orig_ctor, buckets)
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71 return function(family_name, labels, extra)
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72 return orig_ctor(buckets, family_name, labels, extra)
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73 end
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74 end
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75
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76 local function new_metric_family(backend, type_, family_name, unit, description, label_keys, extra)
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77 local metric_ctor = assert(backend[type_], "statistics backend does not support "..type_.." metrics families")
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78 local labels = label_keys or {}
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79 local user_labels = #labels
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80 if type_ == "histogram" then
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81 local buckets = extra and extra.buckets
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82 if not buckets then
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83 error("no buckets given for histogram metric")
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84 end
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85 buckets = array(buckets)
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86 buckets:push(1/0) -- must have +inf bucket
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87
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88 metric_ctor = histogram_metric_ctor(metric_ctor, buckets)
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89 end
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90
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91 local data
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92 if #labels == 0 then
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93 data = metric_ctor(family_name, nil, extra)
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94 else
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95 data = new_multitable()
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96 end
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97
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98 local mf = {
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99 family_name = family_name,
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100 data = data,
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101 type_ = type_,
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102 unit = unit,
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103 description = description,
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104 user_labels = user_labels,
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105 label_keys = labels,
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106 extra = extra,
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107 _metric_ctor = metric_ctor,
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108 }
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109 setmetatable(mf, metric_family_mt);
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110 return mf
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111 end
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112
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113 function metric_family_mt:new_metric(labels)
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114 return self._metric_ctor(self.family_name, labels, self.extra)
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115 end
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116
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117 function metric_family_mt:clear()
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118 for _, metric in self:iter_metrics() do
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119 metric:reset()
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120 end
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121 end
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122
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123 function metric_family_mt:with_labels(...)
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124 local count = select('#', ...)
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125 if count ~= self.user_labels then
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126 error("number of labels passed to with_labels does not match number of label keys")
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127 end
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128 if count == 0 then
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129 return self.data
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130 end
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131 local metric = self.data:get(...)
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132 if not metric then
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133 local values = t_pack(...)
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134 metric = self:new_metric(values)
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135 values[values.n+1] = metric
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136 self.data:set(t_unpack(values, 1, values.n+1))
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137 end
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138 return metric
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139 end
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140
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141 function metric_family_mt:with_partial_label(label)
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142 return new_metric_proxy(self, function (family, ...)
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143 return family:with_labels(label, ...)
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144 end)
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145 end
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146
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147 function metric_family_mt:iter_metrics()
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148 if #self.label_keys == 0 then
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149 local done = false
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150 return function()
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151 if done then
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152 return nil
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153 end
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154 done = true
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155 return {}, self.data
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156 end
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157 end
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158 local searchkeys = {};
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159 local nlabels = #self.label_keys
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160 for i=1,nlabels do
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161 searchkeys[i] = nil;
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162 end
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163 local it, state = iter_multitable(self.data, t_unpack(searchkeys, 1, nlabels))
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164 return function(_s)
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165 local label_values = t_pack(it(_s))
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166 if label_values.n == 0 then
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167 return nil, nil
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168 end
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169 local metric = label_values[label_values.n]
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170 label_values[label_values.n] = nil
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171 label_values.n = label_values.n - 1
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172 return label_values, metric
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173 end, state
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174 end
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175
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176 -- END of generic MetricFamily implementation
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177
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178 -- BEGIN of MetricRegistry implementation
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179
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180
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181 -- Helper to test whether two metrics are "equal".
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182 local function equal_metric_family(mf1, mf2)
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183 if mf1.type_ ~= mf2.type_ then
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184 return false
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185 end
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186 if #mf1.label_keys ~= #mf2.label_keys then
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187 return false
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188 end
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189 -- Ignoring unit here because in general it'll be part of the name anyway
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190 -- So either the unit was moved into/out of the name (which is a valid)
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191 -- thing to do on an upgrade or we would expect not to see any conflicts
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192 -- anyway.
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193 --[[
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194 if mf1.unit ~= mf2.unit then
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195 return false
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196 end
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197 ]]
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198 for i, key in ipairs(mf1.label_keys) do
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199 if key ~= mf2.label_keys[i] then
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200 return false
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201 end
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202 end
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203 return true
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204 end
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205
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206 -- If the unit is not empty, add it to the full name as per the I-D spec.
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207 local function compose_name(name, unit)
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208 local full_name = name
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209 if unit and unit ~= "" then
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210 full_name = full_name .. "_" .. unit
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211 end
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212 -- TODO: prohibit certain suffixes used by metrics if where they may cause
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213 -- conflicts
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214 return full_name
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215 end
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216
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217 local metric_registry_mt = {}
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218 metric_registry_mt.__index = metric_registry_mt
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219
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220 local function new_metric_registry(backend)
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221 local reg = {
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222 families = {},
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223 backend = backend,
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224 }
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225 setmetatable(reg, metric_registry_mt)
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226 return reg
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227 end
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228
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229 function metric_registry_mt:register_metric_family(name, metric_family)
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230 local existing = self.families[name];
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231 if existing then
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232 if not equal_metric_family(metric_family, existing) then
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233 -- We could either be strict about this, or replace the
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234 -- existing metric family with the new one.
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235 -- Being strict is nice to avoid programming errors /
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236 -- conflicts, but causes issues when a new version of a module
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237 -- is loaded.
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238 --
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239 -- We will thus assume that the new metric is the correct one;
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240 -- That is probably OK because unless you're reaching down into
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241 -- the util.openmetrics or core.statsmanager API, your metric
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242 -- name is going to be scoped to `prosody_mod_$modulename`
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243 -- anyway and the damage is thus controlled.
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244 --
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245 -- To make debugging such issues easier, we still log.
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246 log("debug", "replacing incompatible existing metric family %s", name)
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247 -- Below is the code to be strict.
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248 --error("conflicting declarations for metric family "..name)
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249 else
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250 return existing
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251 end
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252 end
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253 self.families[name] = metric_family
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254 return metric_family
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255 end
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256
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257 function metric_registry_mt:gauge(name, unit, description, labels, extra)
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258 name = compose_name(name, unit)
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259 local mf = new_metric_family(self.backend, "gauge", name, unit, description, labels, extra)
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260 mf = self:register_metric_family(name, mf)
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261 return mf
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262 end
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263
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264 function metric_registry_mt:counter(name, unit, description, labels, extra)
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265 name = compose_name(name, unit)
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266 local mf = new_metric_family(self.backend, "counter", name, unit, description, labels, extra)
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267 mf = self:register_metric_family(name, mf)
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268 return mf
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269 end
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270
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271 function metric_registry_mt:histogram(name, unit, description, labels, extra)
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272 name = compose_name(name, unit)
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273 local mf = new_metric_family(self.backend, "histogram", name, unit, description, labels, extra)
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274 mf = self:register_metric_family(name, mf)
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275 return mf
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276 end
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277
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278 function metric_registry_mt:summary(name, unit, description, labels, extra)
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279 name = compose_name(name, unit)
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280 local mf = new_metric_family(self.backend, "summary", name, unit, description, labels, extra)
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281 mf = self:register_metric_family(name, mf)
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282 return mf
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283 end
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284
11523
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285 function metric_registry_mt:get_metric_families()
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286 return self.families
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287 end
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288
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289 -- END of MetricRegistry implementation
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290
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291 -- BEGIN of general helpers for implementing high-level APIs on top of OpenMetrics
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292
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293 local function timed(metric)
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294 local t0 = time()
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295 local submitter = assert(metric.sample or metric.set, "metric type cannot be used with timed()")
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296 return function()
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297 local t1 = time()
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298 submitter(metric, t1-t0)
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299 end
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300 end
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301
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302 -- END of general helpers
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303
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304 return {
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305 new_metric_proxy = new_metric_proxy;
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306 new_metric_registry = new_metric_registry;
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307 render_histogram_le = render_histogram_le;
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308 timed = timed;
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309 }