offline_pods.rb

#!/usr/bin/env ruby
ENV['RAILS_ENV'] ||= "production"

require 'rubygems'
require 'ansi_colors'
require './config/environment'

#user = User.find_by_username("mrzyx")
#handles = user.contacts.collect { |c| c.person.diaspora_handle }
handles = Person.all.collect { |person| person.diaspora_handle }
hosts = handles.collect { |handle| handle.split("@")[1] }.uniq.sort

online = 0

hosts.each do |host|
  print "#{host}... "
  begin
    status = Faraday.get("http://#{host}/.well-known/host-meta").status
    if status == 200
      puts "online".ansi_green
      online += 1
    elsif [500,404].include?(status)
      puts "offline (#{status})".ansi_red
    else
      puts "unknown (#{status})".ansi_yellow
    end
  rescue Errno::EHOSTUNREACH
    puts "offline (no route to host)".ansi_red
  rescue Errno::ETIMEDOUT
    puts "offline (connection timed out)".ansi_red
  rescue Faraday::Error::ConnectionFailed => e
    puts "offline (#{e.message})".ansi_red
  rescue FaradayMiddleware::RedirectLimitReached
    puts "offline (redirect loop)".ansi_red
  end
end

print "#{hosts.size}".ansi_blue
print " known hosts, "
print "#{online}".ansi_green
print " reachable, "
print "#{hosts.size-online}".ansi_red
puts  " unreachable"