find_af1.rb - ものすごく雑なエアフォースワンが飛んでるかどうか探すスクリプト。参考URL→ http://theaviationist.com/2011/11/24/af1-adsb/

find_af1.rb

#!/usr/bin/ruby
require 'open-uri'
require 'json'
require 'logger'

$url = "http://db8.flightradar24.com/zones/japan_all.js"

$log = Logger.new(STDOUT)

def is_found_af1
    begin
        # jsonp -> json
        json_str = open($url).read.scan(/^pd_callback\((.*)\);$/)[0][0]

        # parse json
        json = JSON.parse(json_str)

        # search
        json.each {|k, v|
                s = v.to_s
                if s =~ /AF1/
                        $log.debug(s)
                        return true
                end
        }
    rescue Exception => e
        $log.error(e.to_s)
    end

    return false
end

loop do
    if is_found_af1()
        $log.info("FOUND!")
    else
        $log.info("NOTFOUND")
    end
    STDOUT.flush
    sleep 60
end