Add a history view for terraform states

And link to this from the mini environment page.

3 files changed, 31 insertions, 0 deletions

diff --git a/app/controllers/terraform_http_backend_controller.rb b/app/controllers/terraform_http_backend_controller.rb
index 4d11961..4587f8a 100644
--- a/app/controllers/terraform_http_backend_controller.rb
+++ b/app/controllers/terraform_http_backend_controller.rb
@@ -46,6 +46,25 @@ class TerraformHttpBackendController < ApplicationController
     end
   end
 
+  def show_history
+    @state = TerraformState.where(
+      state_id: state_id
+    ).order(:id).last
+
+    respond_to do |format|
+      format.html do
+        render :show
+      end
+      format.json do
+        if @state.nil?
+          render json: '{}', status: 404
+        else
+          render json: @state.data, status: 200
+        end
+      end
+    end
+  end
+
   def show_by_index
     @state = TerraformState.where(
       state_id: state_id
diff --git a/app/views/backends/terraform_aws/show.html.erb b/app/views/backends/terraform_aws/show.html.erb
index f468567..98034f5 100644
--- a/app/views/backends/terraform_aws/show.html.erb
+++ b/app/views/backends/terraform_aws/show.html.erb
@@ -87,6 +87,13 @@ License along with the GOV.UK Mini Environment Admin.  If not, see
         Backend down
       </div>
     <% end %>
+
+    <br>
+    <a href="<%= terraform_http_backend_show_history_path(
+                   @backend.terraform_state_id
+                 ) %>">
+      View detailed Terraform state information
+    </a>
   </div>
 </div>
 
diff --git a/config/routes.rb b/config/routes.rb
index 55aeab5..ce7b624 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -47,6 +47,11 @@ Rails.application.routes.draw do
   )
   scope :terraform_http_backend do
     get(
+      '*state_id/history',
+      to: 'terraform_http_backend#show_history',
+      as: 'terraform_http_backend_show_history'
+    )
+    get(
       '*state_id/history/*index',
       to: 'terraform_http_backend#show_by_index',
       as: 'terraform_http_backend_show_by_index'