Mongrel users - May 2007 - Rails, Mongrel and Rmagick

i have a rails app with a form that allows uploading an image file.  I take
the image file and read it into rmagick to verify that it''s an image. 
For
some reason I can''t catch an exception thrown by rmagick inside the
app.
After an invalid image file is uploaded the process just hangs.  I have to
kill mongrel and restart to use the app again.

img = Magick::Image::read(@uploaded_file.path).first

This line above should throw a Magick::ImageMagickError exception. 
I''ve
confirmed this with a simple ruby script.

I''ve tried adding breakpoints and as soon as this line is reached
there''s no
coming back, even the breakpointer hangs.

I pasted the method from my active record class here:
http://pastie.caboo.se/62122 .

Does anyone have any ideas?
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I figured out my problem here, but I don''t think it explains the entire
issue.  The problem was that some files where not uploading as image files
and instead the @uploaded_file was a String.  If I check the class of the
file first I can work around the problem.  I still don''t think it makes
sense that there are no exceptions thrown.

Here''s a simplified look at the code in my rails model.

    if @uploaded_file.class == File || @uploaded_file.class == Tempfile
      begin
        img = Magick::Image::read(@uploaded_file.path).first
        self.data = @uploaded_file.read
        self.attributes = {:data_format => img.format, :height =>
img.rows,
:width => img.columns, :filesize => img.filesize}
        return true
      rescue
        # there was an error
      end
    end


On 5/16/07, John Lauck <john-subscribed at recaffeinated.com>
wrote:
>
> i have a rails app with a form that allows uploading an image file.  I
> take the image file and read it into rmagick to verify that it''s
an image.
> For some reason I can''t catch an exception thrown by rmagick
inside the
> app.  After an invalid image file is uploaded the process just hangs.  I
> have to kill mongrel and restart to use the app again.
>
> img = Magick::Image::read(@uploaded_file.path).first
>
> This line above should throw a Magick::ImageMagickError exception. 
I''ve
> confirmed this with a simple ruby script.
>
> I''ve tried adding breakpoints and as soon as this line is reached
there''s
> no coming back, even the breakpointer hangs.
>
> I pasted the method from my active record class here:
> http://pastie.caboo.se/62122 .
>
> Does anyone have any ideas?
>
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