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|
# frozen_string_literal: true
gem "google-cloud-storage", "~> 1.11"
require "google/cloud/storage"
require "net/http"
require "active_support/core_ext/object/to_query"
require "active_storage/filename"
module ActiveStorage
# Wraps the Google Cloud Storage as an Active Storage service. See ActiveStorage::Service for the generic API
# documentation that applies to all services.
class Service::GCSService < Service
def initialize(**config)
@config = config
end
def upload(key, io, checksum: nil)
instrument :upload, key: key, checksum: checksum do
begin
# The official GCS client library doesn't allow us to create a file with no Content-Type metadata.
# We need the file we create to have no Content-Type so we can control it via the response-content-type
# param in signed URLs. Workaround: let the GCS client create the file with an inferred
# Content-Type (usually "application/octet-stream") then clear it.
bucket.create_file(io, key, md5: checksum).update do |file|
file.content_type = nil
end
rescue Google::Cloud::InvalidArgumentError
raise ActiveStorage::IntegrityError
end
end
end
def download(key, &block)
if block_given?
instrument :streaming_download, key: key do
stream(key, &block)
end
else
instrument :download, key: key do
file_for(key).download.string
end
end
end
def download_chunk(key, range)
instrument :download_chunk, key: key, range: range do
file_for(key).download(range: range).string
end
end
def delete(key)
instrument :delete, key: key do
begin
file_for(key).delete
rescue Google::Cloud::NotFoundError
# Ignore files already deleted
end
end
end
def delete_prefixed(prefix)
instrument :delete_prefixed, prefix: prefix do
bucket.files(prefix: prefix).all(&:delete)
end
end
def exist?(key)
instrument :exist, key: key do |payload|
answer = file_for(key).exists?
payload[:exist] = answer
answer
end
end
def url(key, expires_in:, filename:, content_type:, disposition:)
instrument :url, key: key do |payload|
generated_url = file_for(key).signed_url expires: expires_in, query: {
"response-content-disposition" => content_disposition_with(type: disposition, filename: filename),
"response-content-type" => content_type
}
payload[:url] = generated_url
generated_url
end
end
def url_for_direct_upload(key, expires_in:, checksum:, **)
instrument :url, key: key do |payload|
generated_url = bucket.signed_url key, method: "PUT", expires: expires_in, content_md5: checksum
payload[:url] = generated_url
generated_url
end
end
def headers_for_direct_upload(key, checksum:, **)
{ "Content-MD5" => checksum }
end
private
attr_reader :config
def file_for(key, skip_lookup: true)
bucket.file(key, skip_lookup: skip_lookup)
end
# Reads the file for the given key in chunks, yielding each to the block.
def stream(key)
file = file_for(key, skip_lookup: false)
chunk_size = 5.megabytes
offset = 0
while offset < file.size
yield file.download(range: offset..(offset + chunk_size - 1)).string
offset += chunk_size
end
end
def bucket
@bucket ||= client.bucket(config.fetch(:bucket))
end
def client
@client ||= Google::Cloud::Storage.new(config.except(:bucket))
end
end
end
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