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Diffstat (limited to 'activestorage/lib/active_storage/service.rb')
| -rw-r--r-- | activestorage/lib/active_storage/service.rb | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/service.rb b/activestorage/lib/active_storage/service.rb new file mode 100644 index 0000000000..4dd6eb6045 --- /dev/null +++ b/activestorage/lib/active_storage/service.rb @@ -0,0 +1,115 @@ +require "active_storage/log_subscriber" + +module ActiveStorage + class IntegrityError < StandardError; end + # Abstract class serving as an interface for concrete services. + # + # The available services are: + # + # * +Disk+, to manage attachments saved directly on the hard drive. + # * +GCS+, to manage attachments through Google Cloud Storage. + # * +S3+, to manage attachments through Amazon S3. + # * +AzureStorage+, to manage attachments through Microsoft Azure Storage. + # * +Mirror+, to be able to use several services to manage attachments. + # + # Inside a Rails application, you can set-up your services through the + # generated <tt>config/storage.yml</tt> file and reference one + # of the aforementioned constant under the +service+ key. For example: + # + # local: + # service: Disk + # root: <%= Rails.root.join("storage") %> + # + # You can checkout the service's constructor to know which keys are required. + # + # Then, in your application's configuration, you can specify the service to + # use like this: + # + # config.active_storage.service = :local + # + # If you are using Active Storage outside of a Ruby on Rails application, you + # can configure the service to use like this: + # + # ActiveStorage::Blob.service = ActiveStorage::Service.configure( + # :Disk, + # root: Pathname("/foo/bar/storage") + # ) + class Service + extend ActiveSupport::Autoload + autoload :Configurator + + class_attribute :logger + + class << self + # Configure an Active Storage service by name from a set of configurations, + # typically loaded from a YAML file. The Active Storage engine uses this + # to set the global Active Storage service when the app boots. + def configure(service_name, configurations) + Configurator.build(service_name, configurations) + end + + # Override in subclasses that stitch together multiple services and hence + # need to build additional services using the configurator. + # + # Passes the configurator and all of the service's config as keyword args. + # + # See MirrorService for an example. + def build(configurator:, service: nil, **service_config) #:nodoc: + new(**service_config) + end + end + + # Upload the +io+ to the +key+ specified. If a +checksum+ is provided, the service will + # ensure a match when the upload has completed or raise an ActiveStorage::IntegrityError. + def upload(key, io, checksum: nil) + raise NotImplementedError + end + + # Return the content of the file at the +key+. + def download(key) + raise NotImplementedError + end + + # Delete the file at the +key+. + def delete(key) + raise NotImplementedError + end + + # Return true if a file exists at the +key+. + def exist?(key) + raise NotImplementedError + end + + # Returns a signed, temporary URL for the file at the +key+. The URL will be valid for the amount + # of seconds specified in +expires_in+. You most also provide the +disposition+ (+:inline+ or +:attachment+), + # +filename+, and +content_type+ that you wish the file to be served with on request. + def url(key, expires_in:, disposition:, filename:, content_type:) + raise NotImplementedError + end + + # Returns a signed, temporary URL that a direct upload file can be PUT to on the +key+. + # The URL will be valid for the amount of seconds specified in +expires_in+. + # You most also provide the +content_type+, +content_length+, and +checksum+ of the file + # that will be uploaded. All these attributes will be validated by the service upon upload. + def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:) + raise NotImplementedError + end + + # Returns a Hash of headers for +url_for_direct_upload+ requests. + def headers_for_direct_upload(key, filename:, content_type:, content_length:, checksum:) + {} + end + + private + def instrument(operation, key, payload = {}, &block) + ActiveSupport::Notifications.instrument( + "service_#{operation}.active_storage", + payload.merge(key: key, service: service_name), &block) + end + + def service_name + # ActiveStorage::Service::DiskService => Disk + self.class.name.split("::").third.remove("Service") + end + end +end |