Add backend controllers, models and views

Also annotate existing models.

1 files changed, 101 insertions, 0 deletions

diff --git a/app/models/backends/terraform_libvirt.rb b/app/models/backends/terraform_libvirt.rb
new file mode 100644
index 0000000..4cb63b7
--- /dev/null
+++ b/app/models/backends/terraform_libvirt.rb
@@ -0,0 +1,101 @@
+# == Schema Information
+#
+# Table name: terraform_libvirt_backends
+#
+#  id         :integer          not null, primary key
+#  label      :string
+#  uri        :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+require 'fileutils'
+require 'ruby_terraform'
+
+class Backends::TerraformLibvirt < ApplicationRecord
+  has_many :mini_environments, as: :backend
+  
+  self.table_name = "terraform_libvirt_backends"
+
+  def self.label
+    "libvirt"
+  end
+
+  def type_and_id
+    "#{self.class.name}=#{id}"
+  end
+
+  def build(mini_environment)
+    GovukGuix::GenerateVmImageAndSystemJob.enqueue(
+      mini_environment.id
+    )
+  end
+
+  def start(mini_environment)
+    logger.info "Setting up #{mini_environment.name}"
+
+    source = File.expand_path("terraform/libvirt")
+    FileUtils.mkdir_p working_directory(mini_environment)
+
+    Dir.chdir(working_directory(mini_environment)) do
+      if Dir.empty?(".")
+        RubyTerraform.init(
+          backend: true,
+          from_module: source,
+          backend_config: {
+            address: terraform_backend_address(mini_environment)
+          },
+          plugin_dir: plugin_dir
+        )
+      end
+
+      RubyTerraform.apply(
+        vars: terraform_variables(mini_environment),
+        auto_approve: true
+      )
+    end
+  end
+
+  def destroy(mini_environment)
+    Dir.chdir(working_directory(mini_environment)) do
+      RubyTerraform.destroy(
+        vars: terraform_variables(mini_environment),
+        force: true
+      )
+    end
+  end
+
+  def terraform_variables(mini_environment)
+    mini_environment.backend_data.merge(
+      uri: self.uri,
+      machine_name: mini_environment.name.parameterize,
+    )
+  end
+
+  def terraform_backend_address(mini_environment)
+    (
+      'http://localhost:3000' +
+      Rails
+        .application
+        .routes
+        .url_helpers
+        .mini_environment_terraform_http_backend_path(
+          mini_environment
+        )
+    )
+  end
+
+  def working_directory(mini_environment)
+    "tmp/terraform-working-directories/#{mini_environment.name}"
+  end
+
+  def plugin_dir
+    ENV['PATH'].split(':').first
+  end
+
+  def ssh_public_key
+    File.open("#{ENV['HOME']}/.ssh/id_rsa.pub") do |file|
+      file.readline()
+    end
+  end
+end