A small, lightweight and extensible DynDNS server written with Ruby and Rack.
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# frozen_string_literal: true
# Adapted from https://github.com/eric/metriks-graphite/blob/master/lib/metriks/reporter/graphite.rb
require 'metriks'
module Dyndnsd
class TextfileReporter
# @return [String]
attr_reader :file
# @param file [String]
# @param options [Hash{Symbol => Object}]
def initialize(file, options = {})
@file = file
@prefix = options[:prefix]
@registry = options[:registry] || Metriks::Registry.default
@interval = options[:interval] || 60
@on_error = options[:on_error] || proc { |ex| }
end
# @return [void]
def start
@thread ||= Thread.new do
loop do
sleep @interval
Thread.new do
write
rescue StandardError => e
@on_error[e] rescue nil
end
end
end
end
# @return [void]
def stop
@thread&.kill
@thread = nil
end
# @return [void]
def restart
stop
start
end
# @return [void]
def write
File.open(@file, 'w') do |f|
@registry.each do |name, metric|
case metric
when Metriks::Meter
write_metric f, name, metric, [
:count, :one_minute_rate, :five_minute_rate,
:fifteen_minute_rate, :mean_rate
]
when Metriks::Counter
write_metric f, name, metric, [
:count
]
when Metriks::UtilizationTimer
write_metric f, name, metric, [
:count, :one_minute_rate, :five_minute_rate,
:fifteen_minute_rate, :mean_rate,
:min, :max, :mean, :stddev,
:one_minute_utilization, :five_minute_utilization,
:fifteen_minute_utilization, :mean_utilization
], [
:median, :get_95th_percentile
]
when Metriks::Timer
write_metric f, name, metric, [
:count, :one_minute_rate, :five_minute_rate,
:fifteen_minute_rate, :mean_rate,
:min, :max, :mean, :stddev
], [
:median, :get_95th_percentile
]
when Metriks::Histogram
write_metric f, name, metric, [
:count, :min, :max, :mean, :stddev
], [
:median, :get_95th_percentile
]
end
end
end
end
# @param file [String]
# @param base_name [String]
# @param metric [Object]
# @param keys [Array{Symbol}]
# @param snapshot_keys [Array{Symbol}]
# @return [void]
def write_metric(file, base_name, metric, keys, snapshot_keys = [])
time = Time.now.to_i
base_name = base_name.to_s.gsub(/ +/, '_')
base_name = "#{@prefix}.#{base_name}" if @prefix
keys.flatten.each do |key|
name = key.to_s.gsub(/^get_/, '')
value = metric.send(key)
file.write("#{base_name}.#{name} #{value} #{time}\n")
end
unless snapshot_keys.empty?
snapshot = metric.snapshot
snapshot_keys.flatten.each do |key|
name = key.to_s.gsub(/^get_/, '')
value = snapshot.send(key)
file.write("#{base_name}.#{name} #{value} #{time}\n")
end
end
end
end
end