On Thu, Jul 24, 2008 at 8:16 PM, Cédric <[EMAIL PROTECTED]> wrote:
> As requested on IRC, here's my code.
>
> The worker :
>
> ---
> require 'uri'
> require 'net/http'
> require 'RMagick'
> require 'open-uri'
> require 'rexml/document'
>
> class ThumbnailerWorker < BackgrounDRb::MetaWorker
> set_worker_name :thumbnailer_worker
> set_no_auto_load true
>
> def create(args = nil)
> logger.info("[DEBUG] starting a thumbnailer worker (Time: " +
> Time.now.to_s + ")")
> generate_thumbnails(args)
> end
>
> def generate_thumbnails(args = nil) # args = @source.id
> logger.info("[DEBUG] generate_thumbnails(args = " + args.inspect + ")")
> @source_id = eval(args.to_s)
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] = '0,0,0'
>
> thumbnails = Thumbnail.find(:all, :conditions => ['medias.source_id=?
> AND thumbnails.code=?', @source_id, PROCESSING_STATUS], :order =>
> "medias.created_at ASC", :include => { :media => :source })
>
> @failed = 0
> @success = 0
> @progress = 0
> @total = thumbnails.size unless thumbnails.nil?
>
> if @total.nil? or @total == 0
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] =
> '-2,'[EMAIL PROTECTED]','[EMAIL PROTECTED]
> end
>
> upload_directory = RAILS_ROOT + "/public/medias/"
> no_error_encountered = true
>
> for thumbnail in thumbnails
> break if !no_error_encountered
>
> if @progress == 0
> media_id = thumbnail.media_id
> begin
> Dir.mkdir(upload_directory + @source_id.to_s)
> end
> end
>
> begin
> url = URI.split(thumbnail.original.sub(' ', '%20'))
>
> resp = Net::HTTP.get_response(url[2], url[5])
> if resp.code.to_s == "200"
> http = Net::HTTP.start(url[2])
> resp = http.get(url[5])
> image_filename = upload_directory + thumbnail.id.to_s + '.tmp.jpg'
> open(image_filename, "w") { |file| file.write(resp.body) }
> pic = Magick::Image.read(image_filename).first
> GC.start
> maxwidth = 100
> maxheight = 100
> aspectratio = 1.0
> imgwidth = pic.columns
> imgheight = pic.rows
> imgratio = imgwidth.to_f / imgheight.to_f
> scaleratio = imgratio > aspectratio ? (maxwidth.to_f / imgwidth) :
> (maxheight.to_f / imgheight)
> thumb = pic.thumbnail(scaleratio)
> thumb.write(thumbnail_location = upload_directory +
> @source_id.to_s + '/' + thumbnail.id.to_s + '.jpg')
> File.delete(image_filename)
> no_error_encountered = File.exist?(thumbnail_location)
> @success += 1
> else
> logger.info("[WARN] thumbnail for " + thumbnail.original + " not
> generated. response = " + resp.code.to_s)
> @failed += 1
> end
>
> if no_error_encountered
> thumbnail.update_attribute("code", DEFAULT_STATUS)
> end
>
> sleep 0.5
> rescue Exception => exc
> logger.info("[WARN] exception caught in thumbnailer_worker: " +
> exc.inspect)
> logger.info("[WARN] backtrace: " + exc.backtrace.inspect)
> @failed += 1 if resp.code.to_s == "200"
> end
> @progress += 1
> if @progress == @total
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] =
> '9999,'[EMAIL PROTECTED]','[EMAIL PROTECTED]
> else
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] =
> @progress.to_s+','[EMAIL PROTECTED]','[EMAIL PROTECTED]
> logger.info("cache['#{'thumbnailing_for_source_'[EMAIL PROTECTED]']
> = #{cache['thumbnailing_for_source_'[EMAIL PROTECTED]")
> end
> end
>
> if no_error_encountered
> Media.update_all("code=#{DEFAULT_STATUS}", ["source_id=?",
> @source_id])
> Source.update(@source_id, { "code" => DEFAULT_STATUS })
> else
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] =
> '-1,'[EMAIL PROTECTED]','[EMAIL PROTECTED]
> end
>
> return
> end
>
> def finish_work
> cache['thumbnailing_for_source_'[EMAIL PROTECTED] = '-9999,0,0'
> exit
> end
> end
> ---
>
> And the controller :
>
> ---
> def submit
> (some code)
> MiddleMan.new_worker(
> :worker => :thumbnailer_worker,
> :worker_key => "thumbnailing_for_source_" +
> @source.id.to_s,
> :data => @source.id)
> (some more code)
> end
>
> def get_loaded_medias
> begin
> worker_status =
> MiddleMan.worker(:thumbnailer_worker).ask_result("thumbnailing_for_source_#{params[:id]}").split(',')
We have got a trouble in above code. Since you are creating a worker
dynamically using new_worker() method and using a worker key, you must
always, use that worker key to access that worker.
MiddleMan.worker(:thumbnailer_worker,<whatever_worker_key_you_used>).ask_result("thumbnailing_for_source_#{params[:id]}").split(',')
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