prosody
fcc052ca1652
util/statsd.lua

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util/statsd.lua @ 13216:fcc052ca1652 0.12

util.prosodyctl.check: Get some config options via minimal moduleapi #896 The module API has certain coercion features that are useful. Fixes traceback reported in #1812 and other duplicates
author Kim Alvefur <zash@zash.se>
date Mon, 17 Jul 2023 14:03:13 +0200
parent 12387:05c250fa335a
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local socket = require "socket";
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2 local time = require "util.time".now;
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3 local array = require "util.array";
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4 local t_concat = table.concat;
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5
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6 local new_metric_registry = require "util.openmetrics".new_metric_registry;
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7 local render_histogram_le = require "util.openmetrics".render_histogram_le;
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8
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9 -- BEGIN of Metric implementations
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10
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11 -- Gauges
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12 local gauge_metric_mt = {}
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13 gauge_metric_mt.__index = gauge_metric_mt
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14
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15 local function new_gauge_metric(full_name, impl)
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16 local metric = {
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17 _full_name = full_name;
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18 _impl = impl;
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19 value = 0;
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20 }
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21 setmetatable(metric, gauge_metric_mt)
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22 return metric
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23 end
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24
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25 function gauge_metric_mt:set(value)
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26 self.value = value
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27 self._impl:push_gauge(self._full_name, value)
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28 end
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29
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30 function gauge_metric_mt:add(delta)
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31 self.value = self.value + delta
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32 self._impl:push_gauge(self._full_name, self.value)
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33 end
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34
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35 function gauge_metric_mt:reset()
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36 self.value = 0
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37 self._impl:push_gauge(self._full_name, 0)
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38 end
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39
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40 function gauge_metric_mt.iter_samples()
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41 -- statsd backend does not support iteration.
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42 return function()
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43 return nil
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44 end
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45 end
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46
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47 -- Counters
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48 local counter_metric_mt = {}
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49 counter_metric_mt.__index = counter_metric_mt
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50
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51 local function new_counter_metric(full_name, impl)
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52 local metric = {
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53 _full_name = full_name,
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54 _impl = impl,
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55 value = 0,
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56 }
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57 setmetatable(metric, counter_metric_mt)
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58 return metric
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59 end
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60
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61 function counter_metric_mt:set(value)
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62 local delta = value - self.value
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63 self.value = value
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64 self._impl:push_counter_delta(self._full_name, delta)
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65 end
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66
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67 function counter_metric_mt:add(value)
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68 self.value = (self.value or 0) + value
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69 self._impl:push_counter_delta(self._full_name, value)
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70 end
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71
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72 function counter_metric_mt.iter_samples()
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73 -- statsd backend does not support iteration.
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74 return function()
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75 return nil
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76 end
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77 end
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78
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79 function counter_metric_mt:reset()
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80 self.value = 0
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81 end
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82
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83 -- Histograms
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84 local histogram_metric_mt = {}
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85 histogram_metric_mt.__index = histogram_metric_mt
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86
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87 local function new_histogram_metric(buckets, full_name, impl)
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88 -- NOTE: even though the more or less proprietary dogstatsd has Its own
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89 -- histogram implementation, we push the individual buckets in this statsd
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90 -- backend for both consistency and compatibility across statsd
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91 -- implementations.
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92 local metric = {
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93 _sum_name = full_name..".sum",
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94 _count_name = full_name..".count",
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95 _impl = impl,
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96 _created = time(),
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97 _sum = 0,
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98 _count = 0,
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99 }
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100 -- the order of buckets matters unfortunately, so we cannot directly use
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101 -- the thresholds as table keys
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102 for i, threshold in ipairs(buckets) do
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103 local threshold_s = render_histogram_le(threshold)
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104 metric[i] = {
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105 threshold = threshold,
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106 threshold_s = threshold_s,
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107 count = 0,
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108 _full_name = full_name..".bucket."..(threshold_s:gsub("%.", "_")),
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109 }
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110 end
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111 setmetatable(metric, histogram_metric_mt)
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112 return metric
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113 end
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114
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115 function histogram_metric_mt:sample(value)
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116 -- According to the I-D, values must be part of all buckets
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117 for i, bucket in pairs(self) do
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118 if "number" == type(i) and value <= bucket.threshold then
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119 bucket.count = bucket.count + 1
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120 self._impl:push_counter_delta(bucket._full_name, 1)
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121 end
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122 end
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123 self._sum = self._sum + value
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124 self._count = self._count + 1
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125 self._impl:push_gauge(self._sum_name, self._sum)
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126 self._impl:push_counter_delta(self._count_name, 1)
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127 end
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128
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129 function histogram_metric_mt.iter_samples()
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130 -- statsd backend does not support iteration.
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131 return function()
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132 return nil
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133 end
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134 end
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135
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136 function histogram_metric_mt:reset()
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137 self._created = time()
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138 self._count = 0
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139 self._sum = 0
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140 for i, bucket in pairs(self) do
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141 if "number" == type(i) then
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142 bucket.count = 0
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143 end
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144 end
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145 self._impl:push_gauge(self._sum_name, self._sum)
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146 end
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147
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148 -- Summaries
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149 local summary_metric_mt = {}
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150 summary_metric_mt.__index = summary_metric_mt
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151
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152 local function new_summary_metric(full_name, impl)
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153 local metric = {
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154 _sum_name = full_name..".sum",
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155 _count_name = full_name..".count",
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156 _impl = impl,
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157 }
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158 setmetatable(metric, summary_metric_mt)
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159 return metric
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160 end
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161
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162 function summary_metric_mt:sample(value)
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163 self._impl:push_counter_delta(self._sum_name, value)
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164 self._impl:push_counter_delta(self._count_name, 1)
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165 end
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166
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167 function summary_metric_mt.iter_samples()
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168 -- statsd backend does not support iteration.
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169 return function()
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170 return nil
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171 end
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172 end
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173
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174 function summary_metric_mt.reset()
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175 end
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176
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177 -- BEGIN of statsd client implementation
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178
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179 local statsd_mt = {}
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180 statsd_mt.__index = statsd_mt
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181
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182 function statsd_mt:cork()
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183 self.corked = true
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184 self.cork_buffer = self.cork_buffer or {}
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185 end
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186
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187 function statsd_mt:uncork()
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188 self.corked = false
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189 self:_flush_cork_buffer()
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190 end
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191
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192 function statsd_mt:_flush_cork_buffer()
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193 local buffer = self.cork_buffer
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194 for metric_name, value in pairs(buffer) do
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195 self:_send_gauge(metric_name, value)
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196 buffer[metric_name] = nil
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197 end
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198 end
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199
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200 function statsd_mt:push_gauge(metric_name, value)
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201 if self.corked then
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202 self.cork_buffer[metric_name] = value
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203 else
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204 self:_send_gauge(metric_name, value)
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205 end
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206 end
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207
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208 function statsd_mt:_send_gauge(metric_name, value)
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209 self:_send(self.prefix..metric_name..":"..tostring(value).."|g")
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210 end
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211
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212 function statsd_mt:push_counter_delta(metric_name, delta)
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213 self:_send(self.prefix..metric_name..":"..tostring(delta).."|c")
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214 end
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215
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216 function statsd_mt:_send(s)
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217 return self.sock:send(s)
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218 end
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219
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220 -- END of statsd client implementation
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221
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222 local function build_metric_name(family_name, labels)
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223 local parts = array { family_name }
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224 if labels then
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225 parts:append(labels)
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226 end
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227 return t_concat(parts, "/"):gsub("%.", "_"):gsub("/", ".")
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228 end
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229
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230 local function new(config)
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231 if not config or not config.statsd_server then
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232 return nil, "No statsd server specified in the config, please see https://prosody.im/doc/statistics";
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233 end
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234
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235 local sock = socket.udp();
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236 sock:setpeername(config.statsd_server, config.statsd_port or 8125);
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237
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238 local prefix = (config.prefix or "prosody")..".";
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239
11523
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240 local impl = {
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241 metric_registry = nil;
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242 sock = sock;
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243 prefix = prefix;
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244 };
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245 setmetatable(impl, statsd_mt)
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246
11523
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247 local backend = {
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248 gauge = function(family_name, labels)
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249 return new_gauge_metric(build_metric_name(family_name, labels), impl)
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250 end;
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251 counter = function(family_name, labels)
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252 return new_counter_metric(build_metric_name(family_name, labels), impl)
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253 end;
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254 histogram = function(buckets, family_name, labels)
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255 return new_histogram_metric(buckets, build_metric_name(family_name, labels), impl)
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256 end;
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257 summary = function(family_name, labels, extra)
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258 return new_summary_metric(build_metric_name(family_name, labels), impl, extra)
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259 end;
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260 };
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261
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262 impl.metric_registry = new_metric_registry(backend);
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263
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264 return impl;
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265 end
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266
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267 return {
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268 new = new;
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269 }