class BackupStorage::Service::DiskService

Wraps a local disk path as a Backup Storage service. See `BackupStorage::Service` for the generic API documentation that applies to all services.

Attributes

root[R]

Public Class Methods

new(root:) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 11
def initialize(root:)
  @root = root
end

Public Instance Methods

delete(key) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 38
def delete(key)
  instrument :delete, key do
    begin
      File.delete path_for(key)
    rescue Errno::ENOENT
      # Ignore files already deleted
    end
  end
end
download(key) { |data| ... } click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 22
def download(key)
  if block_given?
    instrument :streaming_download, key do
      File.open(path_for(key), "rb") do |file|
        while data = file.read(64.kilobytes)
          yield data
        end
      end
    end
  else
    instrument :download, key do
      File.binread path_for(key)
    end
  end
end
exist?(key) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 48
def exist?(key)
  instrument :exist, key do |payload|
    answer = File.exist? path_for(key)
    payload[:exist] = answer
    answer
  end
end
headers_for_direct_upload(key, content_type:, **) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 101
def headers_for_direct_upload(key, content_type:, **)
  { "Content-Type" => content_type }
end
upload(key, io, checksum: nil) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 15
def upload(key, io, checksum: nil)
  instrument :upload, key, checksum: checksum do
    IO.copy_stream(io, make_path_for(key))
    ensure_integrity_of(key, checksum) if checksum
  end
end
url(key, expires_in:, disposition:, filename:, content_type:) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 56
def url(key, expires_in:, disposition:, filename:, content_type:)
  instrument :url, key do |payload|
    verified_key_with_expiration = BackupStorage.verifier.generate(key, expires_in: expires_in, purpose: :blob_key)

    generated_url =
      if defined?(Rails.application)
        Rails.application.routes.url_helpers.rails_disk_service_path \
          verified_key_with_expiration,
          disposition: disposition, filename: filename, content_type: content_type
      else
        "/rails/backup_storage/disk/#{verified_key_with_expiration}/#{filename}?disposition=#{disposition}&content_type=#{content_type}"
      end

    payload[:url] = generated_url

    generated_url
  end
end
url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 75
def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:)
  instrument :url, key do |payload|
    verified_token_with_expiration = BackupStorage.verifier.generate(
      {
        key: key,
        content_type: content_type,
        content_length: content_length,
        checksum: checksum
      },
      expires_in: expires_in,
      purpose: :blob_token
    )

    generated_url =
      if defined?(Rails.application)
        Rails.application.routes.url_helpers.update_rails_disk_service_path verified_token_with_expiration
      else
        "/rails/backup_storage/disk/#{verified_token_with_expiration}"
      end

    payload[:url] = generated_url

    generated_url
  end
end

Private Instance Methods

ensure_integrity_of(key, checksum) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 118
def ensure_integrity_of(key, checksum)
  unless Digest::MD5.file(path_for(key)).base64digest == checksum
    delete key
    raise BackupStorage::IntegrityError
  end
end
folder_for(key) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 110
def folder_for(key)
  [ key[0..1], key[2..3] ].join("/")
end
make_path_for(key) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 114
def make_path_for(key)
  path_for(key).tap { |path| FileUtils.mkdir_p File.dirname(path) }
end
path_for(key) click to toggle source
# File lib/backup_storage/service/disk_service.rb, line 106
def path_for(key)
  File.join root, folder_for(key), key
end