Add support for managing Terraform AWS backends from the show page

7 files changed, 150 insertions, 1 deletions

diff --git a/app/controllers/backends/terraform_aws_controller.rb b/app/controllers/backends/terraform_aws_controller.rb
index bffac9d..f11403f 100644
--- a/app/controllers/backends/terraform_aws_controller.rb
+++ b/app/controllers/backends/terraform_aws_controller.rb
@@ -55,6 +55,27 @@ class Backends::TerraformAwsController < ApplicationController
     redirect_to setup_path
   end
 
+  def perform_action
+    @backend = Backends::TerraformAws.find(params['id'])
+
+    action = params.require(:commit)
+
+    case action
+    when 'Destroy'
+      Backends::TerraformAwsJob.enqueue(@backend.id, :destroy_backend)
+
+      flash[:notice] = 'Destroying the backend'
+    when 'Deploy'
+      Backends::TerraformAwsJob.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/terraform_aws_job.rb b/app/jobs/backends/terraform_aws_job.rb
new file mode 100644
index 0000000..8a542fc
--- /dev/null
+++ b/app/jobs/backends/terraform_aws_job.rb
@@ -0,0 +1,46 @@
+# GOV.UK Mini Environment Admin
+# Copyright © 2018  Christopher Baines <mail@cbaines.net>
+#
+# This file is part of the GOV.UK Mini Environment Admin.
+#
+# The GOV.UK Mini Environment Admin is free software: you can
+# redistribute it and/or modify it under the terms of the GNU Affero
+# General Public License as published by the Free Software Foundation,
+# either version 3 of the License, or (at your option) any later
+# version.
+#
+# The GOV.UK Mini Environment Admin is distributed in the hope that it
+# will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public
+# License along with the GOV.UK Mini Environment Admin.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+class Backends::TerraformAwsJob < Que::Job
+  def run(terraform_aws_backend_id, action)
+    ActiveRecord::Base.transaction do
+      @backend = Backends::TerraformAws.find(
+        terraform_aws_backend_id
+      )
+
+      @backend.send(action)
+
+      finish
+    end
+  end
+
+  def self.job_title(que_job)
+    que_job.args.last.titleize
+  end
+
+  def self.jobs(terraform_aws_backend_id)
+    QueJob
+      .where(
+        job_class: name
+      ).where(
+        "args->>0 = '#{terraform_aws_backend_id}'"
+      )
+  end
+end
diff --git a/app/models/backends/terraform_aws.rb b/app/models/backends/terraform_aws.rb
index 4db7c51..d0655ee 100644
--- a/app/models/backends/terraform_aws.rb
+++ b/app/models/backends/terraform_aws.rb
@@ -39,6 +39,9 @@
 require 'ruby_terraform'
 
 class Backends::TerraformAws < ApplicationRecord
+  include MiniEnvironmentMethods
+  include BackendMethods
+
   has_many :mini_environments, as: :backend
 
   self.table_name = 'terraform_aws_backends'
diff --git a/app/models/backends/terraform_aws/backend_methods.rb b/app/models/backends/terraform_aws/backend_methods.rb
index 726494c..8c867d9 100644
--- a/app/models/backends/terraform_aws/backend_methods.rb
+++ b/app/models/backends/terraform_aws/backend_methods.rb
@@ -70,4 +70,24 @@ module Backends::TerraformAws::BackendMethods
   def available_data_snapshots
     GovukGuix::DataSnapshot.where(backend: self)
   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_aws/show.html.erb b/app/views/backends/terraform_aws/show.html.erb
index 3a1b329..eca5d3f 100644
--- a/app/views/backends/terraform_aws/show.html.erb
+++ b/app/views/backends/terraform_aws/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_aws_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_aws_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::TerraformAwsJob.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">
diff --git a/config/routes.rb b/config/routes.rb
index 70d967a..55aeab5 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -16,7 +16,11 @@ Rails.application.routes.draw do
       resources :terraform_aws,
                 as: 'terraform_aws_backends',
                 controller: 'backends/terraform_aws',
-                only: %i[create new show update destroy]
+                only: %i[create new show update destroy] do
+        member do
+          post 'perform_action'
+        end
+      end
 
       resources :terraform_libvirt,
                 as: 'terraform_libvirt_backends',
diff --git a/terraform/aws/backend/main.tf b/terraform/aws/backend/main.tf
index 346ab0d..24dd3d8 100644
--- a/terraform/aws/backend/main.tf
+++ b/terraform/aws/backend/main.tf
@@ -328,6 +328,10 @@ resource "aws_route53_record" "main" {
 
 # Outputs
 
+output "backend_up" {
+  value = "${length(aws_spot_instance_request.main.public_ip) != 0}"
+}
+
 output "deployer_key_pair_name" {
   value = "${aws_key_pair.deployer.key_name}"
 }