Reproduce ActiveLdap thread-safe issue

thread_issue_demo.rb

##
# This can reproduce https://github.com/activeldap/activeldap/issues/186
#
# Uses OpenLDAP Docker container
# docker run -p 1389:389 --name activeldap-test --detach osixia/openldap
#

require 'active_ldap'

class User < ActiveLdap::Base
  setup_connection host: 'localhost',
                   port: 1389,
                   bind_dn: 'cn=admin,dc=example,dc=org',
                   password: 'admin',
                   base: 'dc=example,dc=org'

  ldap_mapping dn_attribute: 'cn', classes: [], prefix: ''
end

puts "Schema attribute count: #{User.schema.attributes.length}"

threads = []

20.times do
  threads << Thread.new do
    sleep(rand(0.1..2))
    User.connection.unbind
    puts 'unbound'
  end
end

20.times do
  threads << Thread.new do
    sleep(rand(0.1..2))
    puts "First user: #{User.all.first.dn}"
  rescue NoMethodError => e
    puts "==> #{e.class}: #{e.message}"
  end
end

threads.each(&:join)