1 files changed, 50 insertions, 0 deletions
diff --git a/app/services/start_environment_service.rb b/app/services/start_environment_service.rb
new file mode 100644
index 00000000000..138ee55f6dc
--- /dev/null
+++ b/app/services/start_environment_service.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+class StartEnvironmentService
+  attr_reader :deployment
+  attr_reader :deployable
+
+  delegate :environment, to: :deployment
+  delegate :variables, to: :deployable
+
+  def initialize(deployment)
+    @deployment = deployment
+    @deployable = deployment.deployable
+  end
+
+  def execute
+    return unless deployment.deployed?
+
+    deployment.create_ref
+    deployment.invalidate_cache
+
+    ActiveRecord::Base.transaction do
+      environment.external_url = expanded_environment_url if
+        expanded_environment_url
+
+      environment.fire_state_event(:start)
+
+      break unless environment.save
+
+      deployment.tap(&:update_merge_request_metrics!)
+    end
+  end
+
+  private
+
+  def environment_options
+    @environment_options ||= deployable.options&.dig(:environment) || {}
+  end
+
+  def expanded_environment_url
+    return @expanded_environment_url if defined?(@expanded_environment_url)
+    return unless environment_url
+
+    @expanded_environment_url =
+      ExpandVariables.expand(environment_url, variables)
+  end
+
+  def environment_url
+    environment_options[:url]
+  end
+end