BUGFIX: Don't resolve oneboxes when cooking

Defer to post save job

app/models/post_analyzer.rb

@@ -11,18 +11,9 @@ class PostAnalyzer
   def cook(*args)
     cooked = PrettyText.cook(*args)
 
-    # cook all oneboxes, in the past we used to defer this
-    #  for some reason we decided to do this inline now
-    # TODO: discuss on http://meta.discourse.org what the correct thing is to do
-    #  keep in mind some oneboxes may take a long time to build
     result = Oneboxer.apply(cooked) do |url, elem|
       Oneboxer.invalidate(url) if args.last[:invalidate_oneboxes]
-      begin
-        Oneboxer.onebox url
-      rescue => e
-        Rails.logger.warn("Failed to cook onebox: #{e.message} #{e.backtrace}")
-        nil
-      end
+      Oneboxer.cached_onebox url
     end
 
     cooked = result.to_html if result.changed?

lib/oneboxer.rb

@@ -22,13 +22,24 @@ module Oneboxer
   def self.preview(url, options=nil)
     options ||= {}
     Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
-    Onebox.preview(url, cache: Rails.cache).placeholder_html
+    onebox_raw(url).placeholder_html
   end
 
   def self.onebox(url, options=nil)
     options ||= {}
     Oneboxer.invalidate(url) if options[:invalidate_oneboxes]
-    Onebox.preview(url, cache: Rails.cache).to_s
+    onebox_raw(url).to_s
+  end
+
+  def self.cached_onebox(url)
+    Rails.cache.read(onebox_cache_key(url))
+      .to_s
+  end
+
+  def self.cached_preview(url)
+    Rails.cache.read(onebox_cache_key(url))
+      .try(:placeholder_html)
+      .to_s
   end
 
   def self.oneboxer_exists_for_url?(url)
@@ -36,7 +47,7 @@ module Oneboxer
   end
 
   def self.invalidate(url)
-    Rails.cache.delete(url)
+    Rails.cache.delete(onebox_cache_key(url))
   end
 
   # Parse URLs out of HTML, returning the document when finished.
@@ -82,5 +93,16 @@ module Oneboxer
     Result.new(doc, changed)
   end
 
+  private
+  def self.onebox_cache_key(url)
+    "onebox_#{url}"
+  end
+
+  def self.onebox_raw(url)
+    Rails.cache.fetch(onebox_cache_key(url)){
+      Onebox.preview(url, cache: {})
+    }
+  end
+
 end