Http response time monitoring script (ruby)

README.md

http-monitor.rb

Simple ruby script to monitor http response times over a period of time.

% ruby http-monitor.rb https://google.com 20 3

2023-05-26 12:13:59 : (GET https://google.com) : 1.207913s
2023-05-26 12:14:02 : (GET https://google.com) : 0.102176s
2023-05-26 12:14:05 : (GET https://google.com) : 0.146981s
2023-05-26 12:14:08 : (GET https://google.com) : 0.100712s
2023-05-26 12:14:11 : (GET https://google.com) : 0.101287s
2023-05-26 12:14:15 : (GET https://google.com) : 0.110682s
2023-05-26 12:14:19 : (GET https://google.com) : 1.131652s
---
Total running time: 23.904733s
Total probes made: 7
Average response time: 0.41448614285714286s
Min response time: 0.100712s
Max response time: 1.207913s

http-monitor.rb

# http-monitor.rb
require 'uri'
require 'net/http'

# input parameters
url = ARGV[0] || 'https://google.com'
time = (ARGV[1] || 300).to_f
sleep_interval = (ARGV[2] || 5).to_f

# lib
def stats(start_time, end_time, probes)
  puts '---'
  puts 'Total running time: ' + (end_time - start_time).to_s + 's'
  puts 'Total probes made: ' + probes.length.to_s
  puts 'Average response time: ' + probes.sum.fdiv(probes.size).to_s + 's'
  puts 'Min response time: ' + probes.min.to_s + 's'
  puts 'Max response time: ' + probes.max.to_s + 's'
end

# init http
uri = URI(url)
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == 'https'

start_time = Time.now
probes = []

# process ctrl_c nicely and display monitoring stats
Signal.trap('INT') {
  stats(start_time, Time.now, probes)
  abort 'Interrupted by user'
}

# run probes in a loop with sleeping between probes
while Time.now - start_time < time
  start_probe_time = Time.now
  res = http.get(uri.path ? '/' : uri.path)
  elapsed_probe_time = Time.now - start_probe_time
  probes << elapsed_probe_time
  puts Time.now.strftime('%Y-%m-%d %H:%M:%S') + ' : (GET ' + uri.to_s + ') : ' + elapsed_probe_time.to_s + 's'

  sleep(sleep_interval)
end

# display monitoring stats
stats(start_time, Time.now, probes)