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# frozen_string_literal: true
module DbCleaner
def all_connection_classes
::BeforeAllAdapter.all_connection_classes
end
def delete_from_all_tables!(except: [])
except << 'ar_internal_metadata'
DatabaseCleaner.clean_with(:deletion, cache_tables: false, except: except)
end
def deletion_except_tables
['work_item_types']
end
def setup_database_cleaner
all_connection_classes.each do |connection_class|
DatabaseCleaner[:active_record, { connection: connection_class }]
end
end
def any_connection_class_with_more_than_allowed_columns?
all_connection_classes.any? do |connection_class|
more_than_allowed_columns?(connection_class)
end
end
def more_than_allowed_columns?(connection_class)
# Postgres maximum number of columns in a table is 1600 (https://github.com/postgres/postgres/blob/de41869b64d57160f58852eab20a27f248188135/src/include/access/htup_details.h#L23-L47).
# And since:
# "The DROP COLUMN form does not physically remove the column, but simply makes
# it invisible to SQL operations. Subsequent insert and update operations in the
# table will store a null value for the column. Thus, dropping a column is quick
# but it will not immediately reduce the on-disk size of your table, as the space
# occupied by the dropped column is not reclaimed.
# The space will be reclaimed over time as existing rows are updated."
# according to https://www.postgresql.org/docs/current/sql-altertable.html.
# We drop and recreate the database if any table has more than 1200 columns, just to be safe.
max_allowed_columns = 1200
tables_with_more_than_allowed_columns = connection_class.connection.execute(<<-SQL)
SELECT attrelid::regclass::text AS table, COUNT(*) AS column_count
FROM pg_attribute
GROUP BY attrelid
HAVING COUNT(*) > #{max_allowed_columns}
SQL
tables_with_more_than_allowed_columns.each do |result|
puts "The #{result['table']} (#{connection_class.connection_db_config.name}) table has #{result['column_count']} columns."
end
tables_with_more_than_allowed_columns.any?
end
def recreate_all_databases!
start = Gitlab::Metrics::System.monotonic_time
puts "Recreating the database"
force_disconnect_all_connections!
ActiveRecord::Tasks::DatabaseTasks.drop_current
ActiveRecord::Tasks::DatabaseTasks.create_current
ActiveRecord::Tasks::DatabaseTasks.load_schema_current
# Migrate each database individually
with_reestablished_active_record_base do
all_connection_classes.each do |connection_class|
ActiveRecord::Base.establish_connection(connection_class.connection_db_config) # rubocop: disable Database/EstablishConnection
ActiveRecord::Tasks::DatabaseTasks.migrate
end
end
Gitlab::Database::Partitioning.sync_partitions_ignore_db_error
puts "Databases re-creation done in #{Gitlab::Metrics::System.monotonic_time - start}"
end
def force_disconnect_all_connections!
all_connection_classes.each do |connection_class|
# We use `connection_pool` to avoid going through
# Load Balancer since it does retry ops
pool = connection_class.connection_pool
# Force disconnect https://www.cybertec-postgresql.com/en/terminating-database-connections-in-postgresql/
pool.connection.execute(<<-SQL)
SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = #{pool.connection.quote(pool.db_config.database)}
AND pid != pg_backend_pid();
SQL
connection_class.connection_pool.disconnect!
end
end
end
DbCleaner.prepend_mod_with('DbCleaner')
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