#376: updated logic, UI

app/admin/node_instructions.rb

@@ -57,11 +57,32 @@ ActiveAdmin.register NodeInstruction do
 
   end
 
-  member_action :force, method: :patch do
-    if NodeInstruction::STATUSES.include?(params[:state])
-      resource.send(params[:state])
-      flash[:info] = 'Action added to queue successfully'
+  sidebar 'Actions', only: :index do
+    locked = NodeInstruction.all_locked?
+    span(class: "status_tag #{locked ? 'red' : 'green'}") do
+      if locked
+        link_to 'Unlock instructions', unlock_all_admin_node_instructions_path, method: :post
+      else
+        link_to 'Lock instructions', lock_all_admin_node_instructions_path, method: :post
+      end
     end
+  end
+
+  collection_action :lock_all, method: :post do
+    NodeInstruction.lock_all
+    flash[:info] = 'Locked successfully'
+    redirect_to admin_node_instructions_path
+  end
+
+  collection_action :unlock_all, method: :post do
+    NodeInstruction.unlock_all
+    flash[:info] = 'Unlocked successfully'
+    redirect_to admin_node_instructions_path
+  end
+
+  member_action :force, method: :patch do
+    resource.send(params[:state])
+    flash[:info] = 'Updated successfully'
     redirect_to admin_node_instruction_path(resource)
   end
 

app/jobs/restart_nodes_job.rb

@@ -2,6 +2,7 @@ class RestartNodesJob
   @queue = :low
 
   def self.perform
+    return if NodeInstruction.all_locked?
     available_nodes = RpmBuildNode.all.map{ |n| n.user_id }.compact.uniq
     NodeInstruction.where(status: NodeInstruction::READY).
       where('user_id NOT IN (?)', available_nodes).find_each(&:restart)

app/models/node_instruction.rb

@@ -6,6 +6,8 @@ class NodeInstruction < ActiveRecord::Base
     FAILED      = 'failed'
   ]
 
+  LOCK_KEY = 'NodeInstruction::lock-key'
+
   belongs_to :user
 
   attr_encrypted :instruction, key: APP_CONFIG['keys']['node_instruction_secret_key']
@@ -21,7 +23,9 @@ class NodeInstruction < ActiveRecord::Base
 
   state_machine :status, initial: :ready do
 
-    after_transition on: :restart, do: :perform_restart
+    after_transition(on: :restart) do |instruction, transition|
+      instruction.perform_restart
+    end
 
     event :ready do
       transition %i(ready restarting disabled failed) => :ready
@@ -41,6 +45,8 @@ class NodeInstruction < ActiveRecord::Base
   end
 
   def perform_restart
+    restart_failed if NodeInstruction.all_locked?
+
     success = false
     output  = ''
     instruction.lines.each do |command|
@@ -62,4 +68,16 @@ class NodeInstruction < ActiveRecord::Base
   end
   later :perform_restart, queue: :low
 
+  def self.all_locked?
+    Redis.current.get(LOCK_KEY).present?
+  end
+
+  def self.lock_all
+    Redis.current.set(LOCK_KEY, 1)
+  end
+
+  def self.unlock_all
+    Redis.current.del(LOCK_KEY)
+  end
+
 end

spec/controllers/admin/node_instructions_controller_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe Admin::NodeInstructionsController do
+  it_should_behave_like 'an admin controller'
+end