Class: ActiveStorage::Service

Inherits:
Object
  • Object
show all
Extended by:
ActiveSupport::Autoload
Defined in:
activestorage/lib/active_storage/service.rb

Overview

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 config/storage.yml 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")
)

Defined Under Namespace

Classes: AzureStorageService, Configurator, DiskService, GCSService, MirrorService, Registry, S3Service

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ActiveSupport::Autoload

autoload, autoload_at, autoload_under, autoloads, eager_autoload, eager_load!, extended

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name



44
45
46
 
# File 'activestorage/lib/active_storage/service.rb', line 44

def name
  @name
end

Class Method Details

.build(configurator:, name:, service: nil, **service_config) ⇒ Object

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.



60
61
62
63
64
 
# File 'activestorage/lib/active_storage/service.rb', line 60

def build(configurator:, name:, service: nil, **service_config) #:nodoc:
  new(**service_config).tap do |service_instance|
    service_instance.name = name
  end
end

.configure(service_name, configurations) ⇒ Object

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.



50
51
52
 
# File 'activestorage/lib/active_storage/service.rb', line 50

def configure(service_name, configurations)
  Configurator.build(service_name, configurations)
end

Instance Method Details

#delete(key) ⇒ Object

Delete the file at the key.

Raises:

  • (NotImplementedError) 


94
95
96
 
# File 'activestorage/lib/active_storage/service.rb', line 94

def delete(key)
  raise NotImplementedError
end

#delete_prefixed(prefix) ⇒ Object

Delete files at keys starting with the prefix.

Raises:

  • (NotImplementedError) 


99
100
101
 
# File 'activestorage/lib/active_storage/service.rb', line 99

def delete_prefixed(prefix)
  raise NotImplementedError
end

#download(key) ⇒ Object

Return the content of the file at the key.

Raises:

  • (NotImplementedError) 


80
81
82
 
# File 'activestorage/lib/active_storage/service.rb', line 80

def download(key)
  raise NotImplementedError
end

#download_chunk(key, range) ⇒ Object

Return the partial content in the byte range of the file at the key.

Raises:

  • (NotImplementedError) 


85
86
87
 
# File 'activestorage/lib/active_storage/service.rb', line 85

def download_chunk(key, range)
  raise NotImplementedError
end

#exist?(key) ⇒ Boolean

Return true if a file exists at the key.

Returns:

  • (Boolean)

Raises:

  • (NotImplementedError) 


104
105
106
 
# File 'activestorage/lib/active_storage/service.rb', line 104

def exist?(key)
  raise NotImplementedError
end

#headers_for_direct_upload(key, filename:, content_type:, content_length:, checksum:) ⇒ Object

Returns a Hash of headers for url_for_direct_upload requests.



136
137
138
 
# File 'activestorage/lib/active_storage/service.rb', line 136

def headers_for_direct_upload(key, filename:, content_type:, content_length:, checksum:)
  {}
end

#open(*args, **options, &block) ⇒ Object 



89
90
91
 
# File 'activestorage/lib/active_storage/service.rb', line 89

def open(*args, **options, &block)
  ActiveStorage::Downloader.new(self).open(*args, **options, &block)
end

#public? ⇒ Boolean

Returns:

  • (Boolean) 


140
141
142
 
# File 'activestorage/lib/active_storage/service.rb', line 140

def public?
  @public
end

#update_metadata(key, **metadata) ⇒ Object

Update metadata for the file identified by key in the service. Override in subclasses only if the service needs to store specific metadata that has to be updated upon identification.



76
77
 
# File 'activestorage/lib/active_storage/service.rb', line 76

def update_metadata(key, **metadata)
end

#upload(key, io, checksum: nil, **options) ⇒ Object

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.

Raises:

  • (NotImplementedError) 


69
70
71
 
# File 'activestorage/lib/active_storage/service.rb', line 69

def upload(key, io, checksum: nil, **options)
  raise NotImplementedError
end

#url(key, **options) ⇒ Object

Returns the URL for the file at the key. This returns a permanent URL for public files, and returns a short-lived URL for private files. You must provide the disposition (:inline or :attachment), filename, and content_type that you wish the file to be served with on request. In addition, for private files, you must also provide the amount of seconds the URL will be valid for, specified in expires_in.



112
113
114
115
116
117
118
119
120
121
122
123
124
125
 
# File 'activestorage/lib/active_storage/service.rb', line 112

def url(key, **options)
  instrument :url, key: key do |payload|
    generated_url =
      if public?
        public_url(key, **options)
      else
        private_url(key, **options)
      end

    payload[:url] = generated_url

    generated_url
  end
end

#url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:) ⇒ Object

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 must 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.

Raises:

  • (NotImplementedError) 


131
132
133
 
# File 'activestorage/lib/active_storage/service.rb', line 131

def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:)
  raise NotImplementedError
end