Rails - Jul 2006 - Mongrel + BackgrounDRb + File Column = Upload Progress Bar?

Hi there,

I''ve been digging around trying to find some information (mostly
examples)
on how one would handle a progress bar upload using BackgrounDRb and File
Column. I did read http://backgroundrb.rubyforge.org/ and Ezra''s blog
of
course, but I still have a few questions.

I made a simple upload form (as a test) that is submitted to the
"upload_song" action.

  def upload_song
    @song = Song.new(params[:song])
    @song.member_id = session[:member_id]
    @song.save
    redirect_to :action => ''edit_songs''
  end

The question is, do I create the session[:job_key] within this method like
so:  ??

  def upload_song
    session[:job_key] = MiddleMan.new_worker(:class => :upload_worker, :args
=> "Uploading song...")
    @song = Song.new(params[:song])
    @song.member_id = session[:member_id]
    @song.save
    redirect_to :action => ''edit_songs''
  end

In my view, within the form parameters I have:
<%periodically_call_remote(:url => {:action =>
''get_progress''}, :frequency =>
1) %> which calls the below method:

def get_progress
    if request.xhr?
      progress_percent = MiddleMan.get_worker(session[:job_key]).progress
      render :update do |page|
        page.call(''progressPercent'',
''progressbar'', progress_percent)
        page.redirect_to( :action => ''done'')   if
progress_percent >= 100
      end
    else
      redirect_to :action => ''index''
    end
  end

  def done
    MiddleMan.delete_worker(session[:job_key])
    redirect_to :action => ''edit_songs''
  end


Just for clarity sake, here''s my upload_worker class:

class UploadWorker < BackgrounDRb::Rails

  attr_reader :progress

  def do_work(args)
    @progress = 0
    start_working
  end

  def start_working
      Thread.new do
        while @progress < 100
          sleep rand / 2
          a = [1,3,5,7]
          @progress += a[rand(a.length-1)]
          if @progress > 100
            @progress = 100
          end
        end
      end
    end

  def progress
    puts "Rails is fetching progress: #{@progress}"
    Integer(@progress)
  end
end



Are there any good tutorials out there that walk through the implementation
of backgroundrb (specifically covering file uploads)? Am I close to getting
this thing to work?

Thank you,
Dave Hoefler
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Hi~

On Jul 24, 2006, at 12:47 PM, Dave Hoefler wrote:
> Hi there,
>
> I''ve been digging around trying to find some information (mostly  
> examples) on how one would handle a progress bar upload using  
> BackgrounDRb and File Column. I did read http:// 
> backgroundrb.rubyforge.org/ and Ezra''s blog of course, but I still
> have a few questions.
>
> <snip>
>
> Are there any good tutorials out there that walk through the  
> implementation of backgroundrb (specifically covering file  
> uploads)? Am I close to getting this thing to work?
>
> Thank you,
> Dave Hoefler
>
Hey Dave-

	I''m afraid that BackgrounDRb is not meant for file upload progress  
bars. Since by the time youy could pass the file object to the worker  
class it will have already been uploaded all the way. The progress  
bar feature is for monitoring progress during a long running task. It  
will not work for file uploads, sorry ;) There is a file upload  
progress bar setup that Rick Olson and _why made for mongrel but i am  
not sure of the status on it. I would search the mongrel mailing list  
for upload progress and read what you find there to get this kind of  
thing working.


Cheers-
-Ezra
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Thanks for clearing that up Ezra. I will take a look into the mongrel file
upload option.

-Dave

On 7/24/06, Ezra Zygmuntowicz <ezmobius@gmail.com>
wrote:
>
> Hi~
> On Jul 24, 2006, at 12:47 PM, Dave Hoefler wrote:
>
> Hi there,
>
> I''ve been digging around trying to find some information (mostly
examples)
> on how one would handle a progress bar upload using BackgrounDRb and File
> Column. I did read http://backgroundrb.rubyforge.org/ and Ezra''s
blog of
> course, but I still have a few questions.
>
> <snip>
>
>
> Are there any good tutorials out there that walk through the
> implementation of backgroundrb (specifically covering file uploads)? Am I
> close to getting this thing to work?
>
> Thank you,
> Dave Hoefler
>
>
> Hey Dave-
>
> I''m afraid that BackgrounDRb is not meant for file upload progress
bars.
> Since by the time youy could pass the file object to the worker class it
> will have already been uploaded all the way. The progress bar feature is
for
> monitoring progress during a long running task. It will not work for file
> uploads, sorry ;) There is a file upload progress bar setup that Rick Olson
> and _why made for mongrel but i am not sure of the status on it. I would
> search the mongrel mailing list for upload progress and read what you find
> there to get this kind of thing working.
>
>
> Cheers-
> -Ezra
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
>
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Ezra,

It just dawned on me, can I use backgroundrb for handling uploads in
general? I''ve been trying to figure out how to have mongrel accept
concurrent uploads, and that''s why I thought backgroundrb might be the
way
to go.

Thanks again,
Dave

On 7/24/06, Dave Hoefler <dhoefler@gmail.com>
wrote:
>
> Thanks for clearing that up Ezra. I will take a look into the mongrel file
> upload option.
>
> -Dave
>
> On 7/24/06, Ezra Zygmuntowicz < ezmobius@gmail.com> wrote:
>
> > Hi~
> > On Jul 24, 2006, at 12:47 PM, Dave Hoefler wrote:
> >
> > Hi there,
> >
> > I''ve been digging around trying to find some information
(mostly
> > examples) on how one would handle a progress bar upload using
BackgrounDRb
> > and File Column. I did read http://backgroundrb.rubyforge.org/ and
> > Ezra''s blog of course, but I still have a few questions.
> >
> > <snip>
> >
> >
> > Are there any good tutorials out there that walk through the
> > implementation of backgroundrb (specifically covering file uploads)?
Am I
> > close to getting this thing to work?
> >
> > Thank you,
> > Dave Hoefler
> >
> >
> > Hey Dave-
> >
> > I''m afraid that BackgrounDRb is not meant for file upload
progress bars.
> > Since by the time youy could pass the file object to the worker class
it
> > will have already been uploaded all the way. The progress bar feature
is for
> > monitoring progress during a long running task. It will not work for
file
> > uploads, sorry ;) There is a file upload progress bar setup that Rick
Olson
> > and _why made for mongrel but i am not sure of the status on it. I
would
> > search the mongrel mailing list for upload progress and read what you
find
> > there to get this kind of thing working.
> >
> >
> > Cheers-
> > -Ezra
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
> >
> >
>
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Dave,

I think Ezra''s point was that backrounddb can''t be used for
any kind
of file uploads because rails doesn''t receive the request until it  
the web server sends it to rails, and that doesn''t happen until all  
the request data is received. Backrounddb starts with a rails  
request, so no go (if I understand correctly). I think you could use  
mongrel_cluster for concurrent uploads if you need that. Someone  
correct me if I''m wrong. I think each mongrel process gets tied up  
during an upload, so having multiple mongrel process should allow you  
to do what you want.

Tale care,
Sean

On 24-Jul-06, at 6:33 PM, Dave Hoefler wrote:
> Ezra,
>
> It just dawned on me, can I use backgroundrb for handling uploads  
> in general? I''ve been trying to figure out how to have mongrel  
> accept concurrent uploads, and that''s why I thought backgroundrb  
> might be the way to go.
>
> Thanks again,
> Dave
>
> On 7/24/06, Dave Hoefler <dhoefler@gmail.com> wrote:
> Thanks for clearing that up Ezra. I will take a look into the  
> mongrel file upload option.
>
> -Dave
>
> On 7/24/06, Ezra Zygmuntowicz < ezmobius@gmail.com> wrote:
> Hi~
>
> On Jul 24, 2006, at 12:47 PM, Dave Hoefler wrote:
>
> Hi there,
>
> I''ve been digging around trying to find some information (mostly  
> examples) on how one would handle a progress bar upload using  
> BackgrounDRb and File Column. I did read http:// 
> backgroundrb.rubyforge.org/ and Ezra''s blog of course, but I still
> have a few questions.
>
> <snip>
>
>
> Are there any good tutorials out there that walk through the  
> implementation of backgroundrb (specifically covering file  
> uploads)? Am I close to getting this thing to work?
>
> Thank you,
> Dave Hoefler
>
>
> Hey Dave-
>
> I''m afraid that BackgrounDRb is not meant for file upload progress
> bars. Since by the time youy could pass the file object to the  
> worker class it will have already been uploaded all the way. The  
> progress bar feature is for monitoring progress during a long  
> running task. It will not work for file uploads, sorry ;) There is  
> a file upload progress bar setup that Rick Olson and _why made for  
> mongrel but i am not sure of the status on it. I would search the  
> mongrel mailing list for upload progress and read what you find  
> there to get this kind of thing working.
>
>
> Cheers-
> -Ezra
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
>
>
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
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