nyastodon/app/lib/attachment_batch.rb

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# frozen_string_literal: true
class AttachmentBatch
# Maximum amount of objects you can delete in an S3 API call. It's
# important to remember that this does not correspond to the number
# of records in the batch, since records can have multiple attachments
LIMIT = 1_000
# Attributes generated and maintained by Paperclip (not all of them
# are always used on every class, however)
NULLABLE_ATTRIBUTES = %w(
file_name
content_type
file_size
fingerprint
created_at
updated_at
).freeze
# Styles that are always present even when not explicitly defined
BASE_STYLES = %i(original).freeze
attr_reader :klass, :records, :storage_mode
def initialize(klass, records)
@klass = klass
@records = records
@storage_mode = Paperclip::Attachment.default_options[:storage]
@attachment_names = klass.attachment_definitions.keys
end
def delete
remove_files
batch.delete_all
end
def clear
remove_files
batch.update_all(nullified_attributes) # rubocop:disable Rails/SkipsModelValidations
end
private
def batch
klass.where(id: records.map(&:id))
end
def remove_files
keys = []
logger.debug { "Preparing to delete attachments for #{records.size} records" }
records.each do |record|
@attachment_names.each do |attachment_name|
attachment = record.public_send(attachment_name)
styles = BASE_STYLES | attachment.styles.keys
next if attachment.blank?
styles.each do |style|
case @storage_mode
when :s3
logger.debug { "Adding #{attachment.path(style)} to batch for deletion" }
keys << attachment.style_name_as_path(style)
when :filesystem
logger.debug { "Deleting #{attachment.path(style)}" }
path = attachment.path(style)
FileUtils.remove_file(path, true)
begin
FileUtils.rmdir(File.dirname(path), parents: true)
rescue Errno::EEXIST, Errno::ENOTEMPTY, Errno::ENOENT, Errno::EINVAL, Errno::ENOTDIR, Errno::EACCES
# Ignore failure to delete a directory, with the same ignored errors
# as Paperclip
end
when :fog
logger.debug { "Deleting #{attachment.path(style)}" }
attachment.directory.files.new(key: attachment.path(style)).destroy
when :azure
logger.debug { "Deleting #{attachment.path(style)}" }
attachment.destroy
end
end
end
end
return unless storage_mode == :s3
# We can batch deletes over S3, but there is a limit of how many
# objects can be processed at once, so we have to potentially
# separate them into multiple calls.
keys.each_slice(LIMIT) do |keys_slice|
logger.debug { "Deleting #{keys_slice.size} objects" }
bucket.delete_objects(delete: {
objects: keys_slice.map { |key| { key: key } },
quiet: true,
})
end
end
def bucket
@bucket ||= records.first.public_send(@attachment_names.first).s3_bucket
end
def nullified_attributes
@attachment_names.flat_map { |attachment_name| NULLABLE_ATTRIBUTES.map { |attribute| "#{attachment_name}_#{attribute}" } & klass.column_names }.index_with(nil)
end
def logger
Rails.logger
end
end