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Wraps a set of mirror services and provides a single ActiveStorage::Service object that will all have the files uploaded to them. A primary service is designated to answer calls to:

  • download

  • exists?

  • url

  • url_for_direct_upload

  • headers_for_direct_upload

Methods
D
M
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Attributes

[R] mirrors
[R] primary

Class Public methods

new(primary:, mirrors:)

# File activestorage/lib/active_storage/service/mirror_service.rb, line 29
def initialize(primary:, mirrors:)
  @primary, @mirrors = primary, mirrors
end

Instance Public methods

delete(key)

Delete the file at the key on all services.

# File activestorage/lib/active_storage/service/mirror_service.rb, line 43
def delete(key)
  perform_across_services :delete, key
end

delete_prefixed(prefix)

Delete files at keys starting with the prefix on all services.

# File activestorage/lib/active_storage/service/mirror_service.rb, line 48
def delete_prefixed(prefix)
  perform_across_services :delete_prefixed, prefix
end

mirror(key, checksum:)

Copy the file at the key from the primary service to each of the mirrors where it doesn't already exist.

# File activestorage/lib/active_storage/service/mirror_service.rb, line 54
def mirror(key, checksum:)
  instrument :mirror, key: key, checksum: checksum do
    if (mirrors_in_need_of_mirroring = mirrors.select { |service| !service.exist?(key) }).any?
      primary.open(key, checksum: checksum) do |io|
        mirrors_in_need_of_mirroring.each do |service|
          io.rewind
          service.upload key, io, checksum: checksum
        end
      end
    end
  end
end

upload(key, io, checksum: nil, **options)

Upload the io to the key specified to all services. If a checksum is provided, all services will ensure a match when the upload has completed or raise an ActiveStorage::IntegrityError.

# File activestorage/lib/active_storage/service/mirror_service.rb, line 35
def upload(key, io, checksum: nil, **options)
  each_service.collect do |service|
    io.rewind
    service.upload key, io, checksum: checksum, **options
  end
end