From 56eb9f6c0ee719d06a0cccce8f815922d35b3b05 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kamil=20Trzci=C5=84ski?= <ayufan@ayufan.eu>
Date: Wed, 10 Jul 2019 11:43:51 +0200
Subject: Add `db_spin` and refactor ChaosController

---
 app/controllers/chaos_controller.rb | 87 +++++++++++++++++++++++++++----------
 1 file changed, 64 insertions(+), 23 deletions(-)

(limited to 'app/controllers')

diff --git a/app/controllers/chaos_controller.rb b/app/controllers/chaos_controller.rb
index 8d518c14b90..2985da35d83 100644
--- a/app/controllers/chaos_controller.rb
+++ b/app/controllers/chaos_controller.rb
@@ -1,35 +1,36 @@
 # frozen_string_literal: true
 
 class ChaosController < ActionController::Base
-  before_action :validate_request
+  before_action :validate_chaos_secret, unless: :development?
+  before_action :request_start_time
 
   def leakmem
-    memory_mb = (params[:memory_mb]&.to_i || 100)
-    duration_s = (params[:duration_s]&.to_i || 30).seconds
-
-    start = Time.now
     retainer = []
     # Add `n` 1mb chunks of memory to the retainer array
     memory_mb.times { retainer << "x" * 1.megabyte }
 
-    duration_taken = (Time.now - start).seconds
-    Kernel.sleep duration_s - duration_taken if duration_s > duration_taken
+    Kernel.sleep(duration_left)
 
     render plain: "OK"
   end
 
-  def cpuspin
-    duration_s = (params[:duration_s]&.to_i || 30).seconds
-    end_time = Time.now + duration_s.seconds
-
-    rand while Time.now < end_time
+  def cpu_spin
+    rand while Time.now < expected_end_time
 
     render plain: "OK"
   end
 
+  def db_spin
+    while Time.now < expected_end_time
+      ActiveRecord::Base.connection.execute("SELECT 1")
+
+      end_interval_time = Time.now + [duration_s, interval_s].min
+      rand while Time.now < end_interval_time
+    end
+  end
+
   def sleep
-    duration_s = (params[:duration_s]&.to_i || 30).seconds
-    Kernel.sleep duration_s
+    Kernel.sleep(duration_left)
 
     render plain: "OK"
   end
@@ -40,17 +41,57 @@ class ChaosController < ActionController::Base
 
   private
 
-  def validate_request
-    secret = ENV['GITLAB_CHAOS_SECRET']
-    # GITLAB_CHAOS_SECRET is required unless you're running in Development mode
-    if !secret && !Rails.env.development?
-      render plain: "chaos misconfigured: please configure GITLAB_CHAOS_SECRET when using GITLAB_ENABLE_CHAOS_ENDPOINTS outside of a development environment", status: :internal_server_error
-    end
+  def request_start_time
+    @start_time ||= Time.now
+  end
+
+  def expected_end_time
+    request_start_time + duration_s
+  end
 
-    return unless secret
+  def duration_left
+    # returns 0 if over time
+    [expected_end_time - Time.now, 0].max
+  end
+
+  def validate_chaos_secret
+    unless chaos_secret_configured
+      render plain: "chaos misconfigured: please configure GITLAB_CHAOS_SECRET",
+             status: :internal_server_error
+      return
+    end
 
-    unless request.headers["HTTP_X_CHAOS_SECRET"] == secret
-      render plain: "To experience chaos, please set X-Chaos-Secret header", status: :unauthorized
+    unless Devise.secure_compare(chaos_secret_configured, chaos_secret_request)
+      render plain: "To experience chaos, please set a valid `X-Chaos-Secret` header or `token` param",
+             status: :unauthorized
+      return
     end
   end
+
+  def chaos_secret_configured
+    ENV['GITLAB_CHAOS_SECRET']
+  end
+
+  def chaos_secret_request
+    request.headers["HTTP_X_CHAOS_SECRET"] || params[:token]
+  end
+
+  def interval_s
+    interval_s = params[:interval_s] || 1
+    interval_s.to_f.seconds
+  end
+
+  def duration_s
+    duration_s = params[:duration_s] || 30
+    duration_s.to_i.seconds
+  end
+
+  def memory_mb
+    memory_mb = params[:memory_mb] || 100
+    memory_mb.to_i
+  end
+
+  def development?
+    Rails.env.development?
+  end
 end
-- 
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