Failed to optimize image: unknown reason

snikch · February 23, 2022, 7:03pm

Hey everyone

We’ve just completed a migration of one of our forums from one box to another, while changing the domain at the same time.

In the new installation we’re getting a lot of these errors in our logs

lib/discourse.rb:810:in `block in warn'
lib/discourse.rb:804:in `each'
lib/discourse.rb:804:in `warn'
/var/www/discourse/app/models/optimized_image.rb:329:in `rescue in convert_with'
/var/www/discourse/app/models/optimized_image.rb:311:in `convert_with'
/var/www/discourse/app/models/optimized_image.rb:305:in `optimize'
/var/www/discourse/app/models/optimized_image.rb:289:in `resize'
/var/www/discourse/app/models/optimized_image.rb:97:in `block in create_for'
/var/www/discourse/app/models/optimized_image.rb:19:in `block in lock'
/var/www/discourse/lib/distributed_mutex.rb:33:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:14:in `synchronize'
/var/www/discourse/app/models/optimized_image.rb:18:in `lock'
/var/www/discourse/app/models/optimized_image.rb:68:in `create_for'
/var/www/discourse/app/models/upload.rb:167:in `rescue in get_optimized_image'
/var/www/discourse/app/models/upload.rb:161:in `get_optimized_image'
/var/www/discourse/app/models/upload.rb:147:in `create_thumbnail!'
/var/www/discourse/lib/cooked_post_processor.rb:281:in `convert_to_link!'
/var/www/discourse/lib/cooked_post_processor.rb:487:in `block in post_process_images'
nokogiri-1.13.3-x86_64-linux/lib/nokogiri/xml/node_set.rb:233:in `block in each'
nokogiri-1.13.3-x86_64-linux/lib/nokogiri/xml/node_set.rb:232:in `upto'
nokogiri-1.13.3-x86_64-linux/lib/nokogiri/xml/node_set.rb:232:in `each'
/var/www/discourse/lib/cooked_post_processor.rb:486:in `post_process_images'
/var/www/discourse/lib/cooked_post_processor.rb:44:in `block in post_process'
/var/www/discourse/lib/distributed_mutex.rb:33:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:14:in `synchronize'
/var/www/discourse/lib/cooked_post_processor.rb:40:in `post_process'
/var/www/discourse/app/jobs/regular/process_post.rb:26:in `block in execute'
/var/www/discourse/lib/distributed_mutex.rb:33:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:14:in `synchronize'
/var/www/discourse/app/jobs/regular/process_post.rb:10:in `execute'
/var/www/discourse/app/jobs/base.rb:232:in `block (2 levels) in perform'
rails_multisite-4.0.0/lib/rails_multisite/connection_management.rb:80:in `with_connection'
/var/www/discourse/app/jobs/base.rb:221:in `block in perform'
/var/www/discourse/app/jobs/base.rb:217:in `each'
/var/www/discourse/app/jobs/base.rb:217:in `perform'
sidekiq-6.4.1/lib/sidekiq/processor.rb:196:in `execute_job'
sidekiq-6.4.1/lib/sidekiq/processor.rb:164:in `block (2 levels) in process'
sidekiq-6.4.1/lib/sidekiq/middleware/chain.rb:138:in `block in invoke'
/var/www/discourse/lib/sidekiq/pausable.rb:138:in `call'
sidekiq-6.4.1/lib/sidekiq/middleware/chain.rb:140:in `block in invoke'
sidekiq-6.4.1/lib/sidekiq/middleware/chain.rb:143:in `invoke'
sidekiq-6.4.1/lib/sidekiq/processor.rb:163:in `block in process'
sidekiq-6.4.1/lib/sidekiq/processor.rb:136:in `block (6 levels) in dispatch'
sidekiq-6.4.1/lib/sidekiq/job_retry.rb:114:in `local'
sidekiq-6.4.1/lib/sidekiq/processor.rb:135:in `block (5 levels) in dispatch'
sidekiq-6.4.1/lib/sidekiq.rb:40:in `block in <module:Sidekiq>'
sidekiq-6.4.1/lib/sidekiq/processor.rb:131:in `block (4 levels) in dispatch'
sidekiq-6.4.1/lib/sidekiq/processor.rb:257:in `stats'
sidekiq-6.4.1/lib/sidekiq/processor.rb:126:in `block (3 levels) in dispatch'
sidekiq-6.4.1/lib/sidekiq/job_logger.rb:13:in `call'
sidekiq-6.4.1/lib/sidekiq/processor.rb:125:in `block (2 levels) in dispatch'
sidekiq-6.4.1/lib/sidekiq/job_retry.rb:81:in `global'
sidekiq-6.4.1/lib/sidekiq/processor.rb:124:in `block in dispatch'
sidekiq-6.4.1/lib/sidekiq/job_logger.rb:39:in `prepare'
sidekiq-6.4.1/lib/sidekiq/processor.rb:123:in `dispatch'
sidekiq-6.4.1/lib/sidekiq/processor.rb:162:in `process'
sidekiq-6.4.1/lib/sidekiq/processor.rb:78:in `process_one'
sidekiq-6.4.1/lib/sidekiq/processor.rb:68:in `run'
sidekiq-6.4.1/lib/sidekiq/util.rb:56:in `watchdog'
sidekiq-6.4.1/lib/sidekiq/util.rb:65:in `block in safe_thread'

Looking at the code, it appears if the error doesn’t contain convert: then this generic error message is used, so it’s swallowing the actual underlying error.

github.com

discourse/discourse/blob/main/app/models/optimized_image.rb#L326

      
        
                true
              rescue => e
                if opts[:raise_on_error]
                  raise e
                else
                  error = +"Failed to optimize image:"
            
            
      if e.message =~ /^convert:([^`]+)/
                    error << $1
                  else
                    error << " unknown reason"
                  end
            
            
      Discourse.warn(error, location: to, error_message: e.message, instructions: instructions)
                  false
                end
              end
            end
            
            
# == Schema Information
            #

It feels like this might be a missing prerequisite library on our part, or perhaps some files didn’t make it across during the migration, but it’s hard to tell without the error message. Does anyone have any thoughts on where I should start looking?

sam · February 23, 2022, 11:17pm

My guess here is that ImageMagick is out of date.

Can you confirm you are using our official setup? When we do a ./launcher rebuild we always pull the latest version of the base image.

snikch · February 24, 2022, 9:07pm

Hey Sam, yep we’re using the ./launcher and have rebuilt several times over the last week.

Is there a way I can quickly monkey patch that script to emit the underlying error? My Ruby is a bit rusty, can I just edit a file or is caching / compilation in play?

snikch · February 24, 2022, 9:31pm

Actually, checking our logs this error hasn’t appeared since the other day. Perhaps this was just an issue during our migration

sam · February 24, 2022, 10:42pm

My guess here is that the uploads were missing at the time. We tried to optimise images and convert ran and there was no file there.

Our error message can certainly be improved here.

As to debugging, if you need to. I would edit the file inside the container and sprinkle around Discourse.warn calls that (which is basically printf to logs). Restart container after fiddling with the file.

system · March 26, 2022, 10:43pm

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.

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Failed to optimize image: unknown reason

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