From 96abf0536a1a5e1ec77986325aa8d666cbeaddf1 Mon Sep 17 00:00:00 2001
From: Thor77 <thor77@thor77.org>
Date: Wed, 8 Jun 2022 18:50:54 +0200
Subject: [PATCH] Add simple health check

---
 app/controllers/health_controller.rb | 18 ++++++++++++++++++
 chart/templates/deployment.yaml      |  6 +-----
 config/routes.rb                     |  2 ++
 3 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 app/controllers/health_controller.rb

diff --git a/app/controllers/health_controller.rb b/app/controllers/health_controller.rb
new file mode 100644
index 0000000..d72fc9a
--- /dev/null
+++ b/app/controllers/health_controller.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class HealthController < ApplicationController
+  def index
+    errors = []
+    errors << 'database not conneected' unless database_connected?
+    status = errors.empty? ? :ok : :internal_server_error
+    render json: { errors: }, status:
+  end
+
+  private
+
+  def database_connected?
+    ApplicationRecord.connection.select_value('SELECT 1') == 1
+  rescue StandardError
+    false
+  end
+end
diff --git a/chart/templates/deployment.yaml b/chart/templates/deployment.yaml
index cd225cf..2ad7e96 100644
--- a/chart/templates/deployment.yaml
+++ b/chart/templates/deployment.yaml
@@ -34,13 +34,9 @@ spec:
                 secretKeyRef:
                   name: rails-master-key
                   key: master.key
-          livenessProbe:
-            httpGet:
-              path: /
-              port: http
           readinessProbe:
             httpGet:
-              path: /
+              path: /healthz
               port: http
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
diff --git a/config/routes.rb b/config/routes.rb
index 143d90c..101e869 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -17,4 +17,6 @@ Rails.application.routes.draw do
   end
   resources :match_scores, only: %i[show update]
   resources :groups, only: %i[show]
+
+  get 'healthz', to: 'health#index'
 end