115 lines
3 KiB
Ruby
115 lines
3 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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# A class for reflecting upon a database and its settings, such as the
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# adapter name, PostgreSQL version, and the presence of tables or columns.
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class Reflection
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attr_reader :model
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def initialize(model)
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@model = model
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@version = nil
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end
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def config
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# The result of this method must not be cached, as other methods may use
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# it after making configuration changes and expect those changes to be
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# present. For example, `disable_prepared_statements` expects the
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# configuration settings to always be up to date.
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#
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# See the following for more information:
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#
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# - https://gitlab.com/gitlab-org/release/retrospectives/-/issues/39
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# - https://gitlab.com/gitlab-com/gl-infra/production/-/issues/5238
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model.connection_db_config.configuration_hash.with_indifferent_access
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end
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def username
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config[:username] || ENV['USER']
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end
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def database_name
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config[:database]
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end
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def adapter_name
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config[:adapter]
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end
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def human_adapter_name
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if postgresql?
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'PostgreSQL'
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else
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'Unknown'
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end
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end
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def postgresql?
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adapter_name.casecmp('postgresql') == 0
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end
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# Check whether the underlying database is in read-only mode
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def db_read_only?
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pg_is_in_recovery =
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connection
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.execute('SELECT pg_is_in_recovery()')
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.first
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.fetch('pg_is_in_recovery')
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Gitlab::Utils.to_boolean(pg_is_in_recovery)
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end
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def db_read_write?
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!db_read_only?
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end
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def version
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@version ||= database_version.match(/\A(?:PostgreSQL |)([^\s]+).*\z/)[1]
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end
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def database_version
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connection.execute("SELECT VERSION()").first['version']
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end
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def postgresql_minimum_supported_version?
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version.to_f >= MINIMUM_POSTGRES_VERSION
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end
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def cached_column_exists?(column_name)
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connection
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.schema_cache.columns_hash(model.table_name)
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.has_key?(column_name.to_s)
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end
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def cached_table_exists?
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exists? && connection.schema_cache.data_source_exists?(model.table_name)
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end
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def exists?
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# We can't _just_ check if `connection` raises an error, as it will
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# point to a `ConnectionProxy`, and obtaining those doesn't involve any
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# database queries. So instead we obtain the database version, which is
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# cached after the first call.
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connection.schema_cache.database_version
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true
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rescue StandardError
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false
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end
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def system_id
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row = connection
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.execute('SELECT system_identifier FROM pg_control_system()')
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.first
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row['system_identifier']
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end
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private
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def connection
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model.connection
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end
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end
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end
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end
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