buildkite_pipeline_minutes_month.rb

require 'net/http'
require 'json'
require 'time'

# Set the API token, organization, pipeline, and created_from date
API_TOKEN = ENV['API_TOKEN']
ORG_SLUG = ENV['BUILDKITE_ORGANIZATION_SLUG'] || 'your-org'
PIPELINE_SLUG = ENV['BUILDKITE_PIPELINE_SLUG'] || 'your-pipeline'
PER_PAGE = 100

# Calculate the created_from date in the ISO 8601 format for the past 30 days
created_from = (Time.now - 30 * 24 * 60 * 60).iso8601

# Function to calculate the agent runtime in minutes
def calculate_agent_runtime(started_at, finished_at)
  start_time = Time.parse(started_at)
  finish_time = Time.parse(finished_at)

  runtime_minutes = ((finish_time - start_time) / 60).to_f.ceil
  runtime_minutes
rescue
    0
end

# Retrieve the list of builds for the pipeline in the past 30 days
builds_url = "https://api.buildkite.com/v2/organizations/#{ORG_SLUG}/pipelines/#{PIPELINE_SLUG}/builds?created_from=#{created_from}&per_page=#{PER_PAGE}"
uri = URI.parse(builds_url)
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri.request_uri)
request['Authorization'] = "Bearer #{API_TOKEN}"

response = http.request(request)

builds = JSON.parse(response.body)
total_agent_runtime_minutes = 0

while builds.any?
  builds.each do |build|
    build_number = build['number']
    jobs = build['jobs']

    jobs.each do |job|
      started_at = job['started_at']
      finished_at = job['finished_at']

      agent_runtime_minutes = calculate_agent_runtime(started_at, finished_at)
      if agent_runtime_minutes == 0
        next
      end
      total_agent_runtime_minutes += agent_runtime_minutes
    end
  end
  puts "#{total_agent_runtime_minutes} so far"

  next_page_url = response['Link'].scan(/<([^>]+)>;\s*rel="next"/).flatten.first
  break unless next_page_url

  uri = URI.parse(next_page_url)
  request = Net::HTTP::Get.new(uri.request_uri)
  request['Authorization'] = "Bearer #{API_TOKEN}"
  response = http.request(request)
  builds = JSON.parse(response.body)
end

puts "Total agent runtime in minutes: #{total_agent_runtime_minutes}"