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Andrew Stewart

2007-Aug-06 16:53 UTC

Sending Multiple Files To The Browser

Hello,

I am having trouble sending multiple files to the browser in one  
action.  I can''t be the first to do this, so I''m wondering
what the
best pattern is.

The user has a screen where they can choose files they would like to  
download (typically from one to ten or so).  Next they click a button  
which submits the form to my action.  My action extracts the ids of  
the models from the request and then downloads the files from S3  
(where they were stored with attachment_fu).

Here''s the code in my action:

   def download
     Asset.find_all_by_id(params[:asset_ids]).each do |asset|
       open(File.join(''private'', asset.filename),
''w'') do |file|
         AWS::S3::S3Object.stream(asset.full_filename,  
asset.bucket_name) do |chunk|
           file.write chunk
         end
       end
       #send_file File.join(''private'', asset.filename)
     end
   end

I download each file in turn from S3 and save it onto disk.  Ideally  
I''d like then to send all the files to the browser (as attachments)  
so the browser downloads them all to the user''s disk.  But I''m
only
able to send one of the files this way.  Is there a way to send many  
files like this?

(I suppose if I can only send a single file to the browser I''ll have  
to zip them up into one file and send that.)

As an aside, I''m writing the files to a temporary area on disk before  
sending them to the browser.  I''d rather just stream them directly  
from S3 to the browser -- is that possible instead?

Thanks in advance,

Andy Stewart

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Brian Hogan

2007-Aug-06 17:12 UTC

head link

Re: Sending Multiple Files To The Browser

You''ll have to zip them up before you send them. One approach a lot of
sites
use is a batching approach, where you request your files and then the site
sends you a download link when they''re ready. (mozy.com does this for
file
restores).

But yeah, the way the protocol works is by one response at a time.

On 8/6/07, Andrew Stewart
<boss-rAnrN1QAkGGttCpgsWEBFlaTQe2KTcn/@public.gmane.org>
wrote:>
>
> Hello,
>
> I am having trouble sending multiple files to the browser in one
> action.  I can''t be the first to do this, so I''m
wondering what the
> best pattern is.
>
> The user has a screen where they can choose files they would like to
> download (typically from one to ten or so).  Next they click a button
> which submits the form to my action.  My action extracts the ids of
> the models from the request and then downloads the files from S3
> (where they were stored with attachment_fu).
>
> Here''s the code in my action:
>
>    def download
>      Asset.find_all_by_id(params[:asset_ids]).each do |asset|
>        open(File.join(''private'', asset.filename),
''w'') do |file|
>          AWS::S3::S3Object.stream(asset.full_filename,
> asset.bucket_name) do |chunk|
>            file.write chunk
>          end
>        end
>        #send_file File.join(''private'', asset.filename)
>      end
>    end
>
> I download each file in turn from S3 and save it onto disk.  Ideally
> I''d like then to send all the files to the browser (as
attachments)
> so the browser downloads them all to the user''s disk.  But
I''m only
> able to send one of the files this way.  Is there a way to send many
> files like this?
>
> (I suppose if I can only send a single file to the browser I''ll
have
> to zip them up into one file and send that.)
>
> As an aside, I''m writing the files to a temporary area on disk
before
> sending them to the browser.  I''d rather just stream them directly
> from S3 to the browser -- is that possible instead?
>
> Thanks in advance,
>
> Andy Stewart
>
> >
>
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Rails - Aug 2007 - Sending Multiple Files To The Browser

Sending Multiple Files To The Browser

Re: Sending Multiple Files To The Browser