allow disabling crocodoc polling job

closes CNVS-38714

test plan:
- enable the crocodoc plugin with a bogus api key
- notice that the CrocodocDocument.update_process_states runs and fails
- check the box to disable polling in the plugin
- the job should stop failing

Change-Id: I365ceeba2d83e4d2ec66ed8e977ba7798a58a960
Reviewed-on: https://gerrit.instructure.com/123017
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <cody@instructure.com>
Reviewed-by: Matthew Wheeler <mwheeler@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>

app/views/plugins/_crocodoc_settings.html.erb

@@ -27,6 +27,10 @@
       <td><%= f.blabel :api_key, :en => "Crocodoc API Key" %></td>
       <td><%= f.text_field :api_key %></td>
     </tr>
+    <tr>
+      <td><%= f.blabel :disable_polling, :en => "Disabling polling for document status" %></td>
+      <td><%= f.check_box :disable_polling %></td>
+    </tr>
   </table>
 <% end %>
 

config/initializers/periodic_jobs.rb

@@ -74,7 +74,7 @@ Rails.configuration.after_initialize do
   end
 
   Delayed::Periodic.cron 'CrocodocDocument.update_process_states', '*/10 * * * *' do
-    if Canvas::Crocodoc.config
+    if Canvas::Crocodoc.config && !Canvas::Plugin.value_to_boolean(Canvas::Crocodoc.config['disable_polling'])
       with_each_shard_by_database(CrocodocDocument, :update_process_states)
     end
   end