gitlab-org--gitlab-foss/lib/gitlab/background_migration/delete_diff_files.rb

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# frozen_string_literal: true
# rubocop:disable Style/Documentation
module Gitlab
module BackgroundMigration
class DeleteDiffFiles
class MergeRequestDiff < ActiveRecord::Base
self.table_name = 'merge_request_diffs'
belongs_to :merge_request
has_many :merge_request_diff_files
end
class MergeRequestDiffFile < ActiveRecord::Base
self.table_name = 'merge_request_diff_files'
end
DEAD_TUPLES_THRESHOLD = 50_000
VACUUM_WAIT_TIME = 5.minutes
def perform(ids)
@ids = ids
# We should reschedule until deadtuples get in a desirable
# state (e.g. < 50_000). That may take more than one reschedule.
#
if should_wait_deadtuple_vacuum?
reschedule
return
end
prune_diff_files
end
def should_wait_deadtuple_vacuum?
return false unless Gitlab::Database.postgresql?
diff_files_dead_tuples_count >= DEAD_TUPLES_THRESHOLD
end
private
def reschedule
BackgroundMigrationWorker.perform_in(VACUUM_WAIT_TIME, self.class.name.demodulize, [@ids])
end
def diffs_collection
MergeRequestDiff.where(id: @ids)
end
def diff_files_dead_tuples_count
dead_tuple =
execute_statement("SELECT n_dead_tup FROM pg_stat_all_tables "\
"WHERE relname = 'merge_request_diff_files'")[0]
dead_tuple&.fetch('n_dead_tup', 0).to_i
end
def prune_diff_files
removed = 0
updated = 0
MergeRequestDiff.transaction do
updated = diffs_collection.update_all(state: 'without_files')
removed = MergeRequestDiffFile.where(merge_request_diff_id: @ids).delete_all
end
log_info("Removed #{removed} merge_request_diff_files rows, "\
"updated #{updated} merge_request_diffs rows")
end
def execute_statement(sql)
ActiveRecord::Base.connection.execute(sql)
end
def log_info(message)
Rails.logger.info("BackgroundMigration::DeleteDiffFiles - #{message}")
end
end
end
end