Generate a dot graph of the blocking relationships between all the tickets in a set of epics

jira_epic_graph.rb

#!/usr/bin/env ruby

require 'net/http'
require 'json'

raise "Specify at least one epic" if ARGV.empty?

def make_request(client, url)
  request = Net::HTTP::Get.new(url)
  request.basic_auth ENV['JIRA_USERNAME'], ENV['JIRA_PASSWORD']
  response = client.request(request)
  result = JSON.parse(response.body)
  if result['errorMessages']
    raise result['errorMessages'].first
  else
    result
  end
end

def retrieve_tickets(client, epics, offset=0)
  STDERR.puts "Getting tickets at offset #{offset}"
  result = make_request(client, URI.escape("/rest/api/2/search?startAt=#{offset}&jql='epic link' in (#{epics.join(',')})"))
  total = result['total']
  max_results = result['maxResults']
  if offset + max_results < total
    result['issues'] + retrieve_tickets(client, epics, offset + max_results)
  else
    result['issues']
  end
end

def print_ticket_to_dot(ticket, verbose=true)
  if verbose
    puts %Q|"#{ticket['key']}" [label="#{ticket['key']} #{ticket['fields']['summary'].gsub('"', '\"')}"];|
  else
    puts %Q|"#{ticket['key']}";|
  end
  ticket['fields']['issuelinks'].select {|link| link['type']['outward'] == 'blocks' && link['outwardIssue']}.each do |link|
    puts %Q|"#{ticket['key']}" -> "#{link['outwardIssue']['key']}";|
  end
end

short = ARGV.delete('--short')
epics = ARGV.dup

http = Net::HTTP.new('tickets.puppetlabs.com', 443)
http.use_ssl = true

tickets = retrieve_tickets(http, epics)

puts "digraph {"

tickets.each {|ticket| print_ticket_to_dot(ticket, !short)}

puts "}"