File

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−
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−local config = require "core.configmanager";
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−local log = require "util.logger".init("stats");
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−local timer = require "util.timer";
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−local fire_event = prosody.events.fire_event;
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−
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−local stats_interval_config = config.get("*", "statistics_interval");
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−local stats_interval = tonumber(stats_interval_config);
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−if stats_interval_config and not stats_interval then
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−	log("error", "Invalid 'statistics_interval' setting, statistics will be disabled");
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−end
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−
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−local stats_provider_name;
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−local stats_provider_config = config.get("*", "statistics");
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−local stats_provider = stats_provider_config;
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−
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−if not stats_provider and stats_interval then
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−	stats_provider = "internal";
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−elseif stats_provider and not stats_interval then
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−	stats_interval = 60;
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−end
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−
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−local builtin_providers = {
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−	internal = "util.statistics";
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−	statsd = "util.statsd";
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−};
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−
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−
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−local stats, stats_err = false, nil;
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−
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−if stats_provider then
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−	if stats_provider:sub(1,1) == ":" then
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−		stats_provider = stats_provider:sub(2);
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−		stats_provider_name = "external "..stats_provider;
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−	elseif stats_provider then
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−		stats_provider_name = "built-in "..stats_provider;
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−		stats_provider = builtin_providers[stats_provider];
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−		if not stats_provider then
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−			log("error", "Unrecognized statistics provider '%s', statistics will be disabled", stats_provider_config);
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−		end
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−	end
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−
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−	local have_stats_provider, stats_lib = pcall(require, stats_provider);
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−	if not have_stats_provider then
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−		stats, stats_err = nil, stats_lib;
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−	else
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−		local stats_config = config.get("*", "statistics_config");
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−		stats, stats_err = stats_lib.new(stats_config);
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−		stats_provider_name = stats_lib._NAME or stats_provider_name;
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−	end
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−end
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−
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−if stats == nil then
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−	log("error", "Error loading statistics provider '%s': %s", stats_provider, stats_err);
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−end
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−
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−local measure, collect;
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−local latest_stats = {};
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−local changed_stats = {};
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−local stats_extra = {};
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−
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−if stats then
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−	function measure(type, name)
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−		local f = assert(stats[type], "unknown stat type: "..type);
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−		return f(name);
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−	end
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−
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−	if stats_interval then
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−		log("debug", "Statistics enabled using %s provider, collecting every %d seconds", stats_provider_name, stats_interval);
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−
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−		local mark_collection_start = measure("times", "stats.collection");
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−		local mark_processing_start = measure("times", "stats.processing");
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−
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−		function collect()
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−			local mark_collection_done = mark_collection_start();
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−			fire_event("stats-update");
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−			mark_collection_done();
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−
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−			if stats.get_stats then
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−				changed_stats, stats_extra = {}, {};
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−				for stat_name, getter in pairs(stats.get_stats()) do
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−					local type, value, extra = getter();
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−					local old_value = latest_stats[stat_name];
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−					latest_stats[stat_name] = value;
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−					if value ~= old_value then
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−						changed_stats[stat_name] = value;
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−					end
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−					if extra then
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−						stats_extra[stat_name] = extra;
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−					end
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−				end
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−				local mark_processing_done = mark_processing_start();
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−				fire_event("stats-updated", { stats = latest_stats, changed_stats = changed_stats, stats_extra = stats_extra });
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−				mark_processing_done();
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−			end
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−			return stats_interval;
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−		end
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−		timer.add_task(stats_interval, collect);
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−		prosody.events.add_handler("server-started", function () collect() end, -1);
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−	else
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−		log("debug", "Statistics enabled using %s provider, collection is disabled", stats_provider_name);
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−	end
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−else
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−	log("debug", "Statistics disabled");
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−	function measure() return measure; end
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−end
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−
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−
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−return {
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−	measure = measure;
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−	get_stats = function ()
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−		return latest_stats, changed_stats, stats_extra;
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−	end;
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−	get = function (name)
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−		return latest_stats[name], stats_extra[name];
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−	end;
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−};