Add status page

Author: nygrenh

app/controllers/status_controller.rb

@@ -0,0 +1,13 @@
+# Shows the various statistics under /stats.
+class StatusController < ApplicationController
+
+  def index
+    authorize! :read_instance_state, nil
+    @sandbox_queue_length = Submission.to_be_reprocessed.count
+    @unprocessed_submissions_count = Submission.where(processed: false).count
+    @submissions_count = Submission.where(created_at: Time.current.all_day).count
+    @submissions_count_week = Submission.where(created_at: Time.current.all_week).count
+    @sandboxes = RemoteSandbox.all
+  end
+
+end

app/models/ability.rb

@@ -23,7 +23,9 @@ def initialize(user)
       end
       can :access_pghero
       can :read_vm_log, Submission
+      can :read_instance_state
     else
+      cannot :read_instance_state
       can :read, :all
 
       cannot :access_pghero

app/models/remote_sandbox.rb

@@ -107,7 +107,16 @@ def capacity
     rescue
       nil
     end
-    @capacity || 1
+    @capacity || 0
+  end
+
+  def busy_instances
+    @busy_instances ||= begin
+      get_status['busy_instances']
+    rescue
+      nil
+    end
+    @busy_instances || 0
   end
 
   private

app/views/layouts/_navigation.html.erb

@@ -14,6 +14,7 @@
           <% if current_user.administrator? %>
             <li class="nav-item"><%= navigation_link 'Users', users_path %></li>
             <li class="nav-item"><%= navigation_link 'Course templates', course_templates_path %></li>
+            <li class="nav-item"><%= navigation_link 'Status', status_index_path %></li>
           <% end %>
         <% end %>
       </ul>

app/views/status/index.html.erb

@@ -0,0 +1,50 @@
+<h1>Status</h1>
+
+<p>
+  Here is some adminsitrative information about this instance.
+</p>
+
+<h2>Submissions</h2>
+
+<table class="table">
+  <tbody>
+    <tr>
+      <th scope="row">Submission queue </th scope="row">
+      <td><%= @sandbox_queue_length %></td>
+    </tr>
+    <tr>
+      <th scope="row">Submissions, processing not complete</th>
+      <td><%= @unprocessed_submissions_count %></td>
+    </tr>
+    <tr>
+      <th scope="row">Submissions today</th>
+      <td><%= @submissions_count %></td>
+    </tr>
+    <tr>
+      <th scope="row">Submissions this week</th>
+      <td><%= @submissions_count_week %></td>
+    </tr>
+  </tbody>
+</table>
+
+
+<h2>Sandboxes</h2>
+
+<table class="table">
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Busy instances</th>
+      <th>Capacity</th>
+    </tr>
+  </thead>
+  <tbody>
+    <% @sandboxes.each do |sandbox| %>
+      <tr>
+        <td><%= sandbox.baseurl %></td>
+        <td><%= sandbox.busy_instances %></td>
+        <td><%= sandbox.capacity %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>

config/routes.rb

@@ -286,6 +286,8 @@
 
   resource :feedback_replies, only: [:create]
 
+  resources :status, only: [:index]
+
   if SiteSetting.value('pghero_enabled')
     constraints CanAccessPgHero do
       mount PgHero::Engine, at: 'pghero'