Monitor websites and send an email when a timeout is detected.

check_results.rb

#!/usr/bin/env ruby

require "yaml"
require "time"
require "net/smtp"

# params
filename = "results.data"
sleep_time = 1 # In seconds. Time between iterations
SMTP_SERVER = "localhost"
FROM_EMAIL = "websites_checker@domain.com"
TO_EMAIL = "your@email.com"

last_mtime = Time.now

def check_and_send_mail data
    data["sites"].each do |site, status|
        if status == "timeout"
            puts "#{site} has timed out. Sending mail..."
            msg = "From: #{FROM_EMAIL}>\nTo: #{TO_EMAIL}\nSubject: #{site} has timed out\n\n#{site} has timed out"
            Net::SMTP.start(SMTP_SERVER, 25) do |smtp|
                smtp.send_message msg, FROM_EMAIL, TO_EMAIL
            end
            puts "Sent!"
        end
    end
end

while 1
    # If last modified time is different from current modified time, new results are available. Check it.
    if (last_mtime != File.new(filename).mtime) then

        # Load data
        data = ""
        File.open(filename, "r") do |f|
            data = YAML::load f.read
        end

        #Remember modified time
        last_mtime = File.new(filename).mtime

        # Check data and send an email if needed
        begin
            check_and_send_mail data
        rescue Exception => e
            puts "Error parsing data or sending email: #{e}"
        end
    end

    sleep sleep_time
end

check_sites.rb

#!/usr/bin/env ruby

require "net/http"
require "timeout"
require "yaml"
require "time"

#params
sites = ["www.abiquo.com", "wiki.abiquo.com", "jira.abiquo.com"] #List of sites to monitor
timeout = 10 #In seconds. Timeout when connecting or reading from the site
sleep_time = 10 # In seconds. Time between iterations
filename = "results.data"

while 1
    puts "Checking..."
    sites_status = {}
    sites.each do |s|
        begin
            http = Net::HTTP.new(s)
            http.read_timeout = timeout
            http.open_timeout = timeout
            res = http.get "/"

            sites_status[s] = "#{res.code}#{res.message}"
        rescue Timeout::Error => e
            sites_status[s] = "timeout"
        rescue Errno::ETIMEDOUT => e
            sites_status[s] = "timeout"
        end
    end

    File.open(filename, "w") do |f|
        data = {"when" => Time.now, "sites" => sites_status}
        f.puts data.to_yaml
    end
    puts "Done"

    sleep sleep_time
end