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# frozen_string_literal: true
module Gitlab
module Database
module AsyncIndexes
module MigrationHelpers
def unprepare_async_index(table_name, column_name, **options)
Gitlab::Database::QueryAnalyzers::RestrictAllowedSchemas.require_ddl_mode!
return unless async_index_creation_available?
index_name = options[:name] || index_name(table_name, column_name)
raise 'Specifying index name is mandatory - specify name: argument' unless index_name
unprepare_async_index_by_name(table_name, index_name)
end
def unprepare_async_index_by_name(table_name, index_name, **options)
Gitlab::Database::QueryAnalyzers::RestrictAllowedSchemas.require_ddl_mode!
return unless async_index_creation_available?
PostgresAsyncIndex.find_by(name: index_name).try do |async_index|
async_index.destroy
end
end
# Prepares an index for asynchronous creation.
#
# Stores the index information in the postgres_async_indexes table to be created later. The
# index will be always be created CONCURRENTLY, so that option does not need to be given.
# If an existing asynchronous definition exists with the same name, the existing entry will be
# updated with the new definition.
#
# If the requested index has already been created, it is not stored in the table for
# asynchronous creation.
def prepare_async_index(table_name, column_name, **options)
Gitlab::Database::QueryAnalyzers::RestrictAllowedSchemas.require_ddl_mode!
return unless async_index_creation_available?
index_name = options[:name] || index_name(table_name, column_name)
raise 'Specifying index name is mandatory - specify name: argument' unless index_name
options = options.merge({ algorithm: :concurrently })
if index_exists?(table_name, column_name, **options)
Gitlab::AppLogger.warn(
message: 'Index not prepared because it already exists',
table_name: table_name,
index_name: index_name)
return
end
index, algorithm, if_not_exists = add_index_options(table_name, column_name, **options)
create_index = ActiveRecord::ConnectionAdapters::CreateIndexDefinition.new(index, algorithm, if_not_exists)
schema_creation = ActiveRecord::ConnectionAdapters::PostgreSQL::SchemaCreation.new(ApplicationRecord.connection)
definition = schema_creation.accept(create_index)
async_index = PostgresAsyncIndex.find_or_create_by!(name: index_name) do |rec|
rec.table_name = table_name
rec.definition = definition
end
async_index.definition = definition
async_index.save! # No-op if definition is not changed
Gitlab::AppLogger.info(
message: 'Prepared index for async creation',
table_name: async_index.table_name,
index_name: async_index.name)
async_index
end
def async_index_creation_available?
connection.table_exists?(:postgres_async_indexes)
end
end
end
end
end
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