gitlab-org--gitlab-foss/db/post_migrate/20171207150343_remove_soft_removed_objects.rb

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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class RemoveSoftRemovedObjects < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
module SoftRemoved
extend ActiveSupport::Concern
included do
scope :soft_removed, -> { where('deleted_at IS NOT NULL') }
end
end
class User < ActiveRecord::Base
self.table_name = 'users'
include EachBatch
end
class Issue < ActiveRecord::Base
self.table_name = 'issues'
include EachBatch
include SoftRemoved
end
class MergeRequest < ActiveRecord::Base
self.table_name = 'merge_requests'
include EachBatch
include SoftRemoved
end
class Namespace < ActiveRecord::Base
self.table_name = 'namespaces'
include EachBatch
include SoftRemoved
scope :soft_removed_personal, -> { soft_removed.where(type: nil) }
scope :soft_removed_group, -> { soft_removed.where(type: 'Group') }
end
class Route < ActiveRecord::Base
self.table_name = 'routes'
include EachBatch
include SoftRemoved
end
class Project < ActiveRecord::Base
self.table_name = 'projects'
include EachBatch
include SoftRemoved
end
class CiPipelineSchedule < ActiveRecord::Base
self.table_name = 'ci_pipeline_schedules'
include EachBatch
include SoftRemoved
end
class CiTrigger < ActiveRecord::Base
self.table_name = 'ci_triggers'
include EachBatch
include SoftRemoved
end
MODELS = [Issue, MergeRequest, CiPipelineSchedule, CiTrigger].freeze
def up
disable_statement_timeout do
remove_personal_routes
remove_personal_namespaces
remove_group_namespaces
remove_simple_soft_removed_rows
end
end
def down
# The data removed by this migration can't be restored in an automated way.
end
def remove_simple_soft_removed_rows
create_temporary_indexes
MODELS.each do |model|
say_with_time("Removing soft removed rows from #{model.table_name}") do
model.soft_removed.each_batch do |batch, index|
batch.delete_all
end
end
end
ensure
remove_temporary_indexes
end
def create_temporary_indexes
MODELS.each do |model|
index_name = temporary_index_name_for(model)
# Without this index the removal process can take a very long time. For
# example, getting the next ID of a batch for the `issues` table in
# staging would take between 15 and 20 seconds.
next if temporary_index_exists?(model)
say_with_time("Creating temporary index #{index_name}") do
add_concurrent_index(
model.table_name,
[:deleted_at, :id],
name: index_name,
where: 'deleted_at IS NOT NULL'
)
end
end
end
def remove_temporary_indexes
MODELS.each do |model|
index_name = temporary_index_name_for(model)
next unless temporary_index_exists?(model)
say_with_time("Removing temporary index #{index_name}") do
remove_concurrent_index_by_name(model.table_name, index_name)
end
end
end
def temporary_index_name_for(model)
"index_on_#{model.table_name}_tmp"
end
def temporary_index_exists?(model)
index_name = temporary_index_name_for(model)
index_exists?(model.table_name, [:deleted_at, :id], name: index_name)
end
def remove_personal_namespaces
# Some personal namespaces are left behind in case of GitLab.com. In these
# cases the associated data such as the projects and users has already been
# removed.
Namespace.soft_removed_personal.each_batch do |batch|
batch.delete_all
end
end
def remove_group_namespaces
admin_id = id_for_admin_user
unless admin_id
say 'Not scheduling soft removed groups for removal as no admin user ' \
'could be found. You will need to remove any such groups manually.'
return
end
# Left over groups can't be easily removed because we may also need to
# remove memberships, repositories, and other associated data. As a result
# we'll just schedule a Sidekiq job to remove these.
#
# As of January 5th, 2018 there are 36 groups that will be removed using
# this code.
Namespace.select(:id).soft_removed_group.each_batch(of: 10) do |batch, index|
batch.each do |ns|
schedule_group_removal(index * 5.minutes, ns.id, admin_id)
end
end
end
def schedule_group_removal(delay, group_id, user_id)
if migrate_inline?
GroupDestroyWorker.new.perform(group_id, user_id)
else
GroupDestroyWorker.perform_in(delay, group_id, user_id)
end
end
def remove_personal_routes
namespaces = Namespace.select(1)
.soft_removed
.where('namespaces.type IS NULL')
.where('routes.source_type = ?', 'Namespace')
.where('routes.source_id = namespaces.id')
Route.where('EXISTS (?)', namespaces).each_batch do |batch|
batch.delete_all
end
end
def id_for_admin_user
User.where(admin: true).limit(1).pluck(:id).first
end
def migrate_inline?
Rails.env.test? || Rails.env.development?
end
end