pingy.rb

# call from a rake or cron task make sure your site is still alive
# Usage
# ========
# ping = Pingy.new('https://www.example.com/login', "/login?operations=pingy", 3, 2)
# ping.perform
# puts ping.message 
# ========
# Not Included code to send the email
# see 'Notifier.deliver_ping_failure(@to, @message)' below
# ALSO: hard wired for https urls, needs a few tweaks to work with either http or https

class Pingy
  require 'uri'
  require 'net/http'
  require 'net/https'
    
  def initialize(url, path, try_count, delay)
    raise "try_count must be greater than 0" if try_count <= 0
    raise "delay must be greater than 0" if delay <= 0

    @url = URI.parse(url)
    @path = path
    @try_count = try_count
    @tries = 0
    @delay = delay
    @message = "Checking site at #{Time.now.strftime("%Y-%m-%d %H:%M:%S %Z")}\n"
    @message += "Automated check from: " + `hostname`
    @message += "   Checking: https://#{@url.host}#{@path}\n"
    @user_agent = "Pingy"
    @to = '[email protected]'
  end
  
  attr_reader :message
  attr_accessor :user_agent

  def perform
    while @tries < @try_count do
      result = perform_call
      break if result
      # else
      @tries = @tries + 1
      sleep @delay

      if @tries == @try_count then
        @message += "... All tries failed sending email alert to #{@to}\n"
        # Notifier.deliver_ping_failure(@to, @message)
      else      
        @message += "Try #{@tries + 1}\n"
      end
    end
  end

  def perform_call
    begin
      response = make_call
      @message += "   HTTP Status: #{response.code} \n" #for https://#{@url.host}#{@path}\n"
      unless response.body.nil? then
        @message += "   Response: #{response.body.split("\n")[0][0,70]}...\n"
      end
         
      if response.code != "200" then
        raise "NOT 200 was #{response.code}\n"      
      end
      # else
      return true
    rescue Exception => ex
      full_message = "#{ex.class}: #{ex.message}\n\n" 
      @message += "   Failure: " + full_message
      return false
    end  
  end  
  
  def make_call
    http = Net::HTTP.new(@url.host, 443)
    http.use_ssl = (@url.port == 443) ? true : false
    headers = { 'User-Agent' => @user_agent}
    return http.get(@path, headers)  
  end
end