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module Gitlab
module CurrentSettings
def current_application_settings
if RequestStore.active?
RequestStore.fetch(:current_application_settings) { ensure_application_settings! }
else
ensure_application_settings!
end
end
delegate :sidekiq_throttling_enabled?, to: :current_application_settings
def fake_application_settings(defaults = ::ApplicationSetting.defaults)
FakeApplicationSettings.new(defaults)
end
private
def ensure_application_settings!
return in_memory_application_settings if ENV['IN_MEMORY_APPLICATION_SETTINGS'] == 'true'
cached_application_settings || uncached_application_settings
end
def cached_application_settings
begin
::ApplicationSetting.cached
rescue ::Redis::BaseError, ::Errno::ENOENT
# In case Redis isn't running or the Redis UNIX socket file is not available
end
end
def uncached_application_settings
return fake_application_settings unless connect_to_db?
# This loads from the database into the cache, so handle Redis errors
begin
db_settings = ::ApplicationSetting.current
rescue ::Redis::BaseError, ::Errno::ENOENT
# In case Redis isn't running or the Redis UNIX socket file is not available
end
# If there are pending migrations, it's possible there are columns that
# need to be added to the application settings. To prevent Rake tasks
# and other callers from failing, use any loaded settings and return
# defaults for missing columns.
if ActiveRecord::Migrator.needs_migration?
defaults = ::ApplicationSetting.defaults
defaults.merge!(db_settings.attributes.symbolize_keys) if db_settings.present?
return fake_application_settings(defaults)
end
return db_settings if db_settings.present?
::ApplicationSetting.create_from_defaults || in_memory_application_settings
end
def in_memory_application_settings
@in_memory_application_settings ||= ::ApplicationSetting.new(::ApplicationSetting.defaults)
rescue ActiveRecord::StatementInvalid, ActiveRecord::UnknownAttributeError
# In case migrations the application_settings table is not created yet,
# we fallback to a simple OpenStruct
fake_application_settings
end
def connect_to_db?
# When the DBMS is not available, an exception (e.g. PG::ConnectionBad) is raised
active_db_connection = ActiveRecord::Base.connection.active? rescue false
active_db_connection &&
ActiveRecord::Base.connection.table_exists?('application_settings')
rescue ActiveRecord::NoDatabaseError
false
end
end
end
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