class ActiveStorage::Service::DBService

Public Class Methods

new(**_config) click to toggle source
# File lib/active_storage/service/db_service.rb, line 5
def initialize(**_config)
  @chunk_size = ENV.fetch('ASDB_CHUNK_SIZE') { 1.megabytes }
end

Public Instance Methods

delete(key) click to toggle source
# File lib/active_storage/service/db_service.rb, line 38
def delete(key)
  instrument :delete, key: key do
    ::ActiveStorageDB::File.find_by(ref: key)&.destroy
  end
end
delete_prefixed(prefix) click to toggle source
# File lib/active_storage/service/db_service.rb, line 44
def delete_prefixed(prefix)
  instrument :delete_prefixed, prefix: prefix do
    ::ActiveStorageDB::File.where('ref LIKE ?', "#{prefix}%").destroy_all
  end
end
download(key, &block) click to toggle source
# File lib/active_storage/service/db_service.rb, line 17
def download(key, &block)
  if block_given?
    instrument :streaming_download, key: key do
      stream(key, &block)
    end
  else
    instrument :download, key: key do
      record = ::ActiveStorageDB::File.find_by(ref: key)
      record&.data || raise(ActiveStorage::FileNotFoundError)
    end
  end
end
download_chunk(key, range) click to toggle source
# File lib/active_storage/service/db_service.rb, line 30
def download_chunk(key, range)
  instrument :download_chunk, key: key, range: range do
    chunk_select = "SUBSTRING(data FROM #{range.begin + 1} FOR #{range.size}) AS chunk"
    ::ActiveStorageDB::File.select(chunk_select).find_by(ref: key)&.chunk ||
      raise(ActiveStorage::FileNotFoundError)
  end
end
exist?(key) click to toggle source
# File lib/active_storage/service/db_service.rb, line 50
def exist?(key)
  instrument :exist, key: key do |payload|
    answer = ::ActiveStorageDB::File.where(ref: key).exists?
    payload[:exist] = answer
    answer
  end
end
headers_for_direct_upload(_key, content_type:, **) click to toggle source
# File lib/active_storage/service/db_service.rb, line 108
def headers_for_direct_upload(_key, content_type:, **)
  { 'Content-Type' => content_type }
end
upload(key, io, checksum: nil, **) click to toggle source
# File lib/active_storage/service/db_service.rb, line 9
def upload(key, io, checksum: nil, **)
  instrument :upload, key: key, checksum: checksum do
    file = ::ActiveStorageDB::File.create!(ref: key, data: io.read)
    ensure_integrity_of(key, checksum) if checksum
    file
  end
end
url(key, expires_in:, filename:, disposition:, content_type:) click to toggle source
# File lib/active_storage/service/db_service.rb, line 58
def url(key, expires_in:, filename:, disposition:, content_type:)
  instrument :url, key: key do |payload|
    content_disposition = content_disposition_with(type: disposition, filename: filename)
    verified_key_with_expiration = ActiveStorage.verifier.generate(
      {
        key: key,
        disposition: content_disposition,
        content_type: content_type
      },
      expires_in: expires_in,
      purpose: :blob_key
    )
    current_uri = URI.parse(current_host)
    generated_url = url_helpers.service_url(
      verified_key_with_expiration,
      protocol: current_uri.scheme,
      host: current_uri.host,
      port: current_uri.port,
      disposition: content_disposition,
      content_type: content_type,
      filename: filename
    )
    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/active_storage/service/db_service.rb, line 86
def url_for_direct_upload(key, expires_in:, content_type:, content_length:, checksum:)
  instrument :url, key: key do |payload|
    verified_token_with_expiration = ActiveStorage.verifier.generate(
      {
        key: key,
        content_type: content_type,
        content_length: content_length,
        checksum: checksum
      },
      expires_in: expires_in,
      purpose: :blob_token
    )
    generated_url = url_helpers.update_service_url(
      verified_token_with_expiration,
      host: current_host
    )
    payload[:url] = generated_url

    generated_url
  end
end

Private Instance Methods

current_host() click to toggle source
# File lib/active_storage/service/db_service.rb, line 114
def current_host
  ActiveStorage::Current.host
end
ensure_integrity_of(key, checksum) click to toggle source
# File lib/active_storage/service/db_service.rb, line 118
def ensure_integrity_of(key, checksum)
  file = ::ActiveStorageDB::File.find_by(ref: key)
  return if Digest::MD5.base64digest(file.data) == checksum

  delete(key)
  raise ActiveStorage::IntegrityError
end
stream(key) { |download_chunk(key, range)| ... } click to toggle source
# File lib/active_storage/service/db_service.rb, line 126
def stream(key)
  size =
    ::ActiveStorageDB::File.select('OCTET_LENGTH(data) AS size').find_by(ref: key)&.size ||
    raise(ActiveStorage::FileNotFoundError)
  (size / @chunk_size.to_f).ceil.times.each do |i|
    range = (i * @chunk_size..(i + 1) * @chunk_size - 1)
    yield download_chunk(key, range)
  end
end
url_helpers() click to toggle source
# File lib/active_storage/service/db_service.rb, line 136
def url_helpers
  @url_helpers ||= ::ActiveStorageDB::Engine.routes.url_helpers
end