Failure embedding some topics

Christoph_Holtermann · October 7, 2019, 4:08pm

I am embedding discourse on my website as a discussion plugin as described in

In the recent past for a number of topics I get a “Fehler bei der Einbettung” message (discourse/server.de.yml at 8adec48b335b8cdf3ee7d674e0075f7f461e3a97 · discourse/discourse · GitHub).

I am just trying to figure why that happens. No topic gets created. It used to help to reload the page and after a topic had been created usually things worked fine but now it seems to be stuck on the error.

In the jacascript console I see a message “SyntaxError: An invalid or illegal string was specified”. I traced that back to

github.com

discourse/discourse/blob/23367e79ea735598766ec6f507f6132e0bad3dba/app/assets/javascripts/embed-application.js.no-module.es6#L6

    
      
          (function() {
            const referer = document.getElementById("data-embedded").dataset.referer;
          
          
  function postUp(msg) {
              if (parent) {
                parent.postMessage(msg, referer);
              }
            }
          
          
  function clickPostLink(e) {
              var postId = e.target.getAttribute("data-link-to-post");
              if (postId) {
                var postElement = document.getElementById("post-" + postId);
                if (postElement) {
                  var rect = postElement.getBoundingClientRect();
                  if (rect && rect.top) {

where the call to postMessage(msg, referer) contains an empty referer.

I don’t really understand the problem (the message being sent contains an error message) but the error handling seems broken.

When I look in the discourse logs it seems that this error is connected:

Job exception: unexpected ‘$’ after ’ ’

backtrace

> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/css/parser_extras.rb:87:in `on_error'
> /usr/local/lib/ruby/2.6.0/racc/parser.rb:259:in `_racc_do_parse_c'
> /usr/local/lib/ruby/2.6.0/racc/parser.rb:259:in `do_parse'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/css/parser_extras.rb:62:in `parse'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/css/parser_extras.rb:79:in `xpath_for'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/css.rb:23:in `xpath_for'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:207:in `block in xpath_query_from_css_rule'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:206:in `map'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:206:in `xpath_query_from_css_rule'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:202:in `block in css_rules_to_xpath'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:202:in `map'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:202:in `css_rules_to_xpath'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:171:in `css_internal'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/nokogiri-1.10.4/lib/nokogiri/xml/searchable.rb:107:in `css'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/ruby-readability-0.7.0/lib/readability.rb:79:in `handle_exclusions!'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/ruby-readability-0.7.0/lib/readability.rb:54:in `initialize'
> /var/www/discourse/app/models/topic_embed.rb:131:in `new'
> /var/www/discourse/app/models/topic_embed.rb:131:in `find_remote'
> /var/www/discourse/app/models/topic_embed.rb:177:in `import_remote'
> /var/www/discourse/lib/topic_retriever.rb:58:in `fetch_http'
> /var/www/discourse/lib/topic_retriever.rb:45:in `perform_retrieve'
> /var/www/discourse/lib/topic_retriever.rb:12:in `retrieve'
> /var/www/discourse/app/jobs/regular/retrieve_topic.rb:15:in `execute'
> /var/www/discourse/app/jobs/base.rb:232:in `block (2 levels) in perform'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rails_multisite-2.0.7/lib/rails_multisite/connection_management.rb:63: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'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:192:in `execute_job'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:165:in `block (2 levels) in process'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/middleware/chain.rb:128:in `block in invoke'
> /var/www/discourse/lib/sidekiq/pausable.rb:138:in `call'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/middleware/chain.rb:130:in `block in invoke'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/middleware/chain.rb:133:in `invoke'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:164:in `block in process'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:137:in `block (6 levels) in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/job_retry.rb:109:in `local'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:136:in `block (5 levels) in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq.rb:37:in `block in <module:Sidekiq>'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:132:in `block (4 levels) in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:250:in `stats'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:127:in `block (3 levels) in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/job_logger.rb:8:in `call'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:126:in `block (2 levels) in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/job_retry.rb:74:in `global'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:125:in `block in dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/logging.rb:48:in `with_context'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/logging.rb:42:in `with_job_hash_context'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:124:in `dispatch'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:163:in `process'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:83:in `process_one'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/processor.rb:71:in `run'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/util.rb:16:in `watchdog'
> /var/www/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-5.2.7/lib/sidekiq/util.rb:25:in `block in safe_thread'

as exclusion was mentioned in the backtrace I removed all exclusion (and inclusion) rules. That way all went back to the behavior I knew. Failure in the beginning. Success after reloading.

I’ll check the exclusion criteria and see which ones are most problematic.

eviltrout · October 7, 2019, 8:01pm

Are you embedding Discourse on the same domain? You might want to look at the embed_any_origin setting.