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Expose chunked downloads

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This commit is contained in:
George Claghorn 2017-07-10 16:17:48 -04:00
parent 9cf3347899
commit f66a69076f
3 changed files with 19 additions and 6 deletions
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4
lib/active_storage/blob.rb
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@ -56,8 +56,8 @@ class ActiveStorage::Blob < ActiveRecord::Base
service.upload(key, io, checksum: checksum) service.upload(key, io, checksum: checksum)
end end
def download def download(&block)
service.download key service.download key, &block
end end

4
lib/active_storage/service/disk_service.rb
View file

@ -20,8 +20,8 @@ class ActiveStorage::Service::DiskService < ActiveStorage::Service
def download(key) def download(key)
if block_given? if block_given?
instrument :streaming_download, key do instrument :streaming_download, key do
File.open(path_for(key)) do |file| File.open(path_for(key), 'rb') do |file|
while data = file.binread(64.kilobytes) while data = file.read(64.kilobytes)
yield data yield data
end end
end end

13
test/blob_test.rb
View file

@ -12,6 +12,19 @@ class ActiveStorage::BlobTest < ActiveSupport::TestCase
assert_equal Digest::MD5.base64digest(data), blob.checksum assert_equal Digest::MD5.base64digest(data), blob.checksum
end end
test "download yields chunks" do
blob = create_blob data: 'a' * 75.kilobytes
chunks = []
blob.download do |chunk|
chunks << chunk
end
assert_equal 2, chunks.size
assert_equal 'a' * 64.kilobytes, chunks.first
assert_equal 'a' * 11.kilobytes, chunks.second
end
test "urls expiring in 5 minutes" do test "urls expiring in 5 minutes" do
blob = create_blob blob = create_blob