prosody
10d13e0554f9
core/statsmanager.lua

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core/statsmanager.lua @ 11515:10d13e0554f9

core.statsmanager: Allow special "manual" value for statistics_interval When set, no periodic statistics collection is done by core.statsmanager, instead some module is expected to call collect() when it suits. Obviously only one such module should be enabled. Quoth jonas’ > correct way is to scrape the internal sources on each call to /metrics > in the context of Prometheus "manual" as opposed to "automatic", from the point of view of statsmanager.
author Kim Alvefur <zash@zash.se>
date Tue, 06 Apr 2021 23:25:15 +0200
parent 11506:9a3ebdd65f9c
child 11523:5f15ab7c6ae5
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1
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2 local config = require "core.configmanager";
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3 local log = require "util.logger".init("stats");
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4 local timer = require "util.timer";
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5 local fire_event = prosody.events.fire_event;
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6
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7 local stats_interval_config = config.get("*", "statistics_interval");
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8 local stats_interval = tonumber(stats_interval_config);
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9 if stats_interval_config and not stats_interval and stats_interval_config ~= "manual" then
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10 log("error", "Invalid 'statistics_interval' setting, statistics will be disabled");
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11 end
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12
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13 local stats_provider_name;
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14 local stats_provider_config = config.get("*", "statistics");
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15 local stats_provider = stats_provider_config;
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16
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17 if not stats_provider and stats_interval then
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18 stats_provider = "internal";
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19 elseif stats_provider and not stats_interval then
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20 stats_interval = 60;
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21 end
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22 if stats_interval_config == "manual" then
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23 stats_interval = nil;
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24 end
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25
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26 local builtin_providers = {
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27 internal = "util.statistics";
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28 statsd = "util.statsd";
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29 };
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30
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32 local stats, stats_err = false, nil;
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34 if stats_provider then
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35 if stats_provider:sub(1,1) == ":" then
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36 stats_provider = stats_provider:sub(2);
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37 stats_provider_name = "external "..stats_provider;
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38 elseif stats_provider then
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39 stats_provider_name = "built-in "..stats_provider;
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40 stats_provider = builtin_providers[stats_provider];
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41 if not stats_provider then
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42 log("error", "Unrecognized statistics provider '%s', statistics will be disabled", stats_provider_config);
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43 end
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44 end
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45
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46 local have_stats_provider, stats_lib = pcall(require, stats_provider);
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47 if not have_stats_provider then
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48 stats, stats_err = nil, stats_lib;
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49 else
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50 local stats_config = config.get("*", "statistics_config");
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51 stats, stats_err = stats_lib.new(stats_config);
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52 stats_provider_name = stats_lib._NAME or stats_provider_name;
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53 end
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54 end
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55
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56 if stats == nil then
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57 log("error", "Error loading statistics provider '%s': %s", stats_provider, stats_err);
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58 end
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59
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60 local measure, collect;
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61 local latest_stats = {};
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62 local changed_stats = {};
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63 local stats_extra = {};
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64
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65 if stats then
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66 function measure(type, name, conf)
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67 local f = assert(stats[type], "unknown stat type: "..type);
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68 return f(name, conf);
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69 end
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70
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71 if stats_interval or stats_interval_config == "manual" then
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72
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73 local mark_collection_start = measure("times", "stats.collection");
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74 local mark_processing_start = measure("times", "stats.processing");
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75
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76 function collect()
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77 local mark_collection_done = mark_collection_start();
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78 fire_event("stats-update");
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79 mark_collection_done();
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80
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81 if stats.get_stats then
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82 local mark_processing_done = mark_processing_start();
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83 changed_stats, stats_extra = {}, {};
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84 for stat_name, getter in pairs(stats.get_stats()) do
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85 -- luacheck: ignore 211/type
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86 local type, value, extra = getter();
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87 local old_value = latest_stats[stat_name];
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88 latest_stats[stat_name] = value;
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89 if value ~= old_value then
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90 changed_stats[stat_name] = value;
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91 end
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92 if extra then
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93 stats_extra[stat_name] = extra;
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94 end
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95 end
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96 fire_event("stats-updated", { stats = latest_stats, changed_stats = changed_stats, stats_extra = stats_extra });
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97 mark_processing_done();
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98 end
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99 return stats_interval;
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100 end
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101 if stats_interval then
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102 log("debug", "Statistics enabled using %s provider, collecting every %d seconds", stats_provider_name, stats_interval);
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103 timer.add_task(stats_interval, collect);
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104 prosody.events.add_handler("server-started", function () collect() end, -1);
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105 prosody.events.add_handler("server-stopped", function () collect() end, -1);
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106 else
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107 log("debug", "Statistics enabled using %s provider, no scheduled collection", stats_provider_name);
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108 end
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109 else
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110 log("debug", "Statistics enabled using %s provider, collection is disabled", stats_provider_name);
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111 end
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112 else
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113 log("debug", "Statistics disabled");
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114 function measure() return measure; end
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115 end
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116
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117 local exported_collect = nil;
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118 if stats_interval_config == "manual" then
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119 exported_collect = collect;
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120 end
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121
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122 return {
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123 collect = exported_collect;
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124 measure = measure;
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125 get_stats = function ()
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126 return latest_stats, changed_stats, stats_extra;
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127 end;
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128 get = function (name)
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129 return latest_stats[name], stats_extra[name];
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130 end;
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131 };