GRN2-xx: Removed Health Check Gem (#840)

* Initial work on removing health check gem

* Added health checks

* Fixed gemfile

Gemfile

@@ -71,9 +71,6 @@ gem 'http_accept_language'
 # Markdown parsing.
 gem 'redcarpet'
 
-# For health check endpoint
-gem "health_check"
-
 # For limiting access based on user roles
 gem 'cancancan', '~> 2.0'
 

Gemfile.lock

@@ -137,8 +137,6 @@ GEM
       activesupport (>= 4.2.0)
     hashdiff (0.4.0)
     hashie (3.6.0)
-    health_check (3.0.0)
-      railties (>= 5.0)
     hiredis (0.6.3)
     http_accept_language (2.1.1)
     i18n (1.6.0)
@@ -363,7 +361,6 @@ DEPENDENCIES
   factory_bot_rails
   faker
   font-awesome-sass (~> 5.9.0)
-  health_check
   hiredis
   http_accept_language
   i18n-language-mapping (~> 0.1.0)

app/controllers/health_check_controller.rb

@@ -0,0 +1,74 @@
+# frozen_string_literal: true
+
+# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
+#
+# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).
+#
+# This program is free software; you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free Software
+# Foundation; either version 3.0 of the License, or (at your option) any later
+# version.
+#
+# BigBlueButton 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
+
+class HealthCheckController < ApplicationController
+  skip_before_action :redirect_to_https, :set_user_domain, :set_user_settings, :maintenance_mode?, :migration_error?,
+  :user_locale, :check_admin_password, :check_user_role
+
+  # GET /health_check
+  def all
+    response = "success"
+    @cache_expire = 10.seconds
+
+    begin
+      cache_check
+      database_check
+      email_check
+    rescue => e
+      response = "Health Check Failure: #{e}"
+    end
+
+    render plain: response
+  end
+
+  private
+
+  def cache_check
+    if Rails.cache.write("__health_check_cache_write__", "true", expires_in: @cache_expire)
+      raise "Unable to read from cache" unless Rails.cache.read("__health_check_cache_write__") == "true"
+    else
+      raise "Unable to write to cache"
+    end
+  end
+
+  def database_check
+    if defined?(ActiveRecord)
+      raise "Database not responding" unless ActiveRecord::Migrator.current_version
+    end
+    raise "Pending migrations" unless ActiveRecord::Migration.check_pending!.nil?
+  end
+
+  def email_check
+    test_smtp if Rails.configuration.action_mailer.delivery_method == :smtp
+  end
+
+  def test_smtp
+    settings = ActionMailer::Base.smtp_settings
+
+    smtp = Net::SMTP.new(settings[:address], settings[:port])
+    if settings[:enable_starttls_auto] == "true"
+      smtp.enable_starttls_auto if smtp.respond_to?(:enable_starttls_auto)
+    end
+
+    smtp.start(settings[:domain]) do |s|
+      s.authenticate(settings[:user_name], settings[:password], settings[:authentication])
+    end
+  rescue => e
+    raise "Unable to connect to SMTP Server - #{e}"
+  end
+end

config/initializers/health_check.rb

@@ -1,45 +0,0 @@
-# frozen_string_literal: true
-
-# Health check to monitor the status of the rails server
-HealthCheck.setup do |config|
-  # uri prefix (no leading slash)
-  config.uri = 'health_check'
-
-  # Text output upon success
-  config.success = 'success'
-
-  # Timeout in seconds used when checking smtp server
-  config.smtp_timeout = 30.0
-
-  # http status code used when plain text error message is output
-  # Set to 200 if you want your want to distinguish between partial (text does not include success) and
-  # total failure of rails application (http status of 500 etc)
-
-  config.http_status_for_error_text = 500
-
-  # http status code used when an error object is output (json or xml)
-  # Set to 200 if you want your want to distinguish between partial (healthy property == false) and
-  # total failure of rails application (http status of 500 etc)
-
-  config.http_status_for_error_object = 500
-
-  # You can customize which checks happen on a standard health check, eg to set an explicit list use:
-  config.standard_checks = %w(database migrations emailconf db-migration)
-
-  # You can set what tests are run with the 'full' or 'all' parameter
-  config.full_checks = %w(database migrations email cache)
-
-  config.add_custom_check('db-migration') do
-    # any code that returns blank on success and non blank string upon failure
-    ENV["DB_MIGRATE_FAILED"].blank? ? "" : "Database migration failed"
-  end
-
-  # max-age of response in seconds
-  # cache-control is public when max_age > 1 and basic_auth_username is not set
-  # You can force private without authentication for longer max_age by
-  # setting basic_auth_username but not basic_auth_password
-  config.max_age = 1
-
-  # http status code used when the ip is not allowed for the request
-  config.http_status_for_ip_whitelist_error = 403
-end

config/routes.rb

@@ -17,7 +17,7 @@
 # with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
 
 Rails.application.routes.draw do
-  get 'health_check', to: 'health_check/health_check#index'
+  get '/health_check', to: 'health_check#all'
 
   # Error routes.
   match '/401', to: 'errors#unauthorized', via: :all, as: :unauthorized