services/api/app/controllers/database_controller.rb

   1 class DatabaseController < ApplicationController
   2   skip_before_filter :find_object_by_uuid
   3   skip_before_filter :render_404_if_no_object
   4   before_filter :admin_required
   5   def reset
   6     raise ArvadosModel::PermissionDeniedError unless Rails.env == 'test'
   7
   8     # Sanity check: If someone has actually logged in here, this might
   9     # not really be a throwaway database. Client test suites should
  10     # use @example.com email addresses when creating user records, so
  11     # we can tell they're not valuable.
  12     user_uuids = User.
  13       where('email is null or email not like ?', '%@example.com').
  14       collect &:uuid
  15     fixture_uuids =
  16       YAML::load_file(File.expand_path('../../../test/fixtures/users.yml',
  17                                        __FILE__)).
  18       values.collect { |u| u['uuid'] }
  19     unexpected_uuids = user_uuids - fixture_uuids
  20     if unexpected_uuids.any?
  21       logger.error("Running in test environment, but non-fixture users exist: " +
  22                    "#{unexpected_uuids}")
  23       raise ArvadosModel::PermissionDeniedError
  24     end
  25
  26     require 'active_record/fixtures'
  27
  28     # What kinds of fixtures do we have?
  29     fixturesets = Dir.glob(Rails.root.join('test', 'fixtures', '*.yml')).
  30       collect { |yml| yml.match(/([^\/]*)\.yml$/)[1] }
  31
  32     table_names = '"' + ActiveRecord::Base.connection.tables.join('","') + '"'
  33
  34     attempts_left = 20
  35     begin
  36       ActiveRecord::Base.transaction do
  37         # Avoid deadlock by locking all tables before doing anything
  38         # drastic.
  39         ActiveRecord::Base.connection.execute \
  40         "LOCK TABLE #{table_names} IN ACCESS EXCLUSIVE MODE"
  41
  42         # Delete existing fixtures (and everything else) from fixture
  43         # tables
  44         fixturesets.each do |x|
  45           x.classify.constantize.unscoped.delete_all
  46         end
  47
  48         # create_fixtures() is a no-op for cached fixture sets, so
  49         # uncache them all.
  50         ActiveRecord::Fixtures.reset_cache
  51         ActiveRecord::Fixtures.
  52           create_fixtures(Rails.root.join('test', 'fixtures'), fixturesets)
  53
  54         # Dump cache of permissions etc.
  55         Rails.cache.clear
  56         ActiveRecord::Base.connection.clear_query_cache
  57
  58         # Reload database seeds
  59         DatabaseSeeds.install
  60       end
  61     rescue ActiveRecord::StatementInvalid => e
  62       if "#{e.inspect}" =~ /deadlock detected/i and (attempts_left -= 1) > 0
  63         logger.info "Waiting for lock -- #{e.inspect}"
  64         sleep 0.5
  65         retry
  66       end
  67       raise
  68     end
  69
  70     # Done.
  71     send_json success: true
  72   end
  73 end