Support managing the libvirt backend from the show page

6 files changed, 128 insertions, 16 deletions

diff --git a/app/controllers/backends/terraform_libvirt_controller.rb b/app/controllers/backends/terraform_libvirt_controller.rb
index bbc5e08..1feae41 100644
--- a/app/controllers/backends/terraform_libvirt_controller.rb
+++ b/app/controllers/backends/terraform_libvirt_controller.rb
@@ -26,7 +26,7 @@ class Backends::TerraformLibvirtController < ApplicationController
 
   def create
     backend = Backends::TerraformLibvirt.create(create_params)
-    Backends::DeployTerraformLibvirtJob.enqueue(backend.id)
+    Backends::TerraformLibvirtJob.enqueue(backend.id, :deploy_backend)
 
     flash[:success] = "Backend #{backend.label} created"
 
@@ -57,6 +57,27 @@ class Backends::TerraformLibvirtController < ApplicationController
     redirect_to setup_path
   end
 
+  def perform_action
+    @backend = Backends::TerraformLibvirt.find(params['id'])
+
+    action = params.require(:commit)
+
+    case action
+    when 'Destroy'
+      Backends::TerraformLibvirtJob.enqueue(@backend.id, :destroy_backend)
+
+      flash[:notice] = 'Destroying the backend'
+    when 'Deploy'
+      Backends::TerraformLibvirtJob.enqueue(@backend.id, :deploy_backend)
+
+      flash[:notice] = 'Deploying the backend'
+    else
+      flash[:error] = "Unknown action #{action}"
+    end
+
+    render 'show'
+  end
+
   private
 
   def create_params
diff --git a/app/jobs/backends/deploy_terraform_libvirt_job.rb b/app/jobs/backends/terraform_libvirt_job.rb
index 4565189..af8eba3 100644
--- a/app/jobs/backends/deploy_terraform_libvirt_job.rb
+++ b/app/jobs/backends/terraform_libvirt_job.rb
@@ -18,13 +18,17 @@
 # License along with the GOV.UK Mini Environment Admin.  If not, see
 # <http://www.gnu.org/licenses/>.
 
-class Backends::DeployTerraformLibvirtJob < Que::Job
-  def run(terraform_libvirt_backend_id)
-    @terraform_libvirt_backend_id = terraform_libvirt_backend_id
+class Backends::TerraformLibvirtJob < Que::Job
+  def run(terraform_libvirt_backend_id, action)
+    ActiveRecord::Base.transaction do
+      @backend = Backends::TerraformLibvirt.find(
+        terraform_libvirt_backend_id
+      )
 
-    Backends::TerraformLibvirt
-      .find(terraform_libvirt_backend_id)
-      .deploy_backend
+      @backend.send(action)
+
+      finish
+    end
   end
 
   def self.jobs(terraform_libvirt_backend_id)
@@ -33,6 +37,6 @@ class Backends::DeployTerraformLibvirtJob < Que::Job
         job_class: name
       ).where(
         "args->>0 = '#{terraform_libvirt_backend_id}'"
-      ).to_a
+      )
   end
 end
diff --git a/app/models/backends/terraform_libvirt/backend_methods.rb b/app/models/backends/terraform_libvirt/backend_methods.rb
index 7c3c47d..7595611 100644
--- a/app/models/backends/terraform_libvirt/backend_methods.rb
+++ b/app/models/backends/terraform_libvirt/backend_methods.rb
@@ -33,4 +33,39 @@ module Backends::TerraformLibvirt::BackendMethods
       )
     end
   end
+
+  def destroy_backend
+    TerraformWorkingDirectory.new(
+      terraform_state_id,
+      'terraform/libvirt/backend'
+    ).within_working_directory do
+      RubyTerraform.destroy(
+        vars: {
+          uri: uri,
+          domain: domain
+        },
+        force: true
+      )
+    end
+  end
+
+  def backend_terraform_states
+    TerraformState.where(
+      state_id: terraform_state_id
+    )
+  end
+
+  def status
+    latest_terraform_state = backend_terraform_states.order(:id).last
+
+    running = (
+      latest_terraform_state &&
+      (latest_terraform_state.output_value('backend_up') == 'true')
+    )
+
+    {
+      running: running,
+      updated_at: latest_terraform_state.try(:created_at)
+    }
+  end
 end
diff --git a/app/views/backends/terraform_libvirt/show.html.erb b/app/views/backends/terraform_libvirt/show.html.erb
index d7a1641..5b2213b 100644
--- a/app/views/backends/terraform_libvirt/show.html.erb
+++ b/app/views/backends/terraform_libvirt/show.html.erb
@@ -27,6 +27,57 @@ License along with the GOV.UK Mini Environment Admin.  If not, see
 </a>
 
 <h1>Backend: <%= @backend.label %></h1>
+<% status = @backend.status %>
+
+<div class="row">
+  <div class="col-md-2">
+    <%= form_with(url: perform_action_terraform_libvirt_backend_path(
+                         @backend
+                       ),
+                  local: true,
+                  method: "post") do %>
+      <%= submit_tag('Deploy',
+                     role: 'button',
+                     class: 'btn btn-lg btn-success')
+      %>
+    <% end %>
+
+    <%= form_with(url: perform_action_terraform_libvirt_backend_path(
+                         @backend
+                       ),
+                  local: true,
+                  method: "post") do %>
+      <%= submit_tag("Destroy",
+                     role: 'button',
+                     class: 'btn btn-lg btn-danger')
+      %>
+    <% end %>
+  </div>
+  <div class="col-md-6">
+    <%= render(
+      partial: 'shared/jobs',
+      locals: {
+        jobs: Backends::TerraformLibvirtJob.jobs(@backend.id).order(id: :desc)
+      }
+    ) %>
+  </div>
+  <div class="col-md-4">
+
+    <% if status[:running] %>
+      <div class="alert alert-success text-center"
+           role="alert"
+           style="margin-bottom: 0px;">
+        Backend available
+      </div>
+    <% else %>
+      <div class="alert alert-warning text-center"
+           role="alert"
+           style="margin-bottom: 0px;">
+        Backend down
+      </div>
+    <% end %>
+  </div>
+</div>
 
 <div class="row">
   <div class="col-md-8">
@@ -118,10 +169,3 @@ License along with the GOV.UK Mini Environment Admin.  If not, see
     </tr>
   <% end %>
 </table>
-
-<h3>Jobs</h3>
-
-<%= render(
-  partial: 'shared/jobs',
-  locals: { jobs: Backends::DeployTerraformLibvirtJob.jobs(@backend.id) }
-) %>
diff --git a/config/routes.rb b/config/routes.rb
index 3c303bc..70d967a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -21,7 +21,11 @@ Rails.application.routes.draw do
       resources :terraform_libvirt,
                 as: 'terraform_libvirt_backends',
                 controller: 'backends/terraform_libvirt',
-                only: %i[create new show update destroy]
+                only: %i[create new show update destroy] do
+        member do
+          post 'perform_action'
+        end
+      end
     end
   end
 
diff --git a/terraform/libvirt/backend/main.tf b/terraform/libvirt/backend/main.tf
index a8f7e3c..a733306 100644
--- a/terraform/libvirt/backend/main.tf
+++ b/terraform/libvirt/backend/main.tf
@@ -26,3 +26,7 @@ resource "libvirt_network" "main" {
 output "network_name" {
   value = "${libvirt_network.main.name}"
 }
+
+output "backend_up" {
+  value = "${length(libvirt_network.main.name) != 0}"
+}