Add custom-wizard-specific caching system

Initially for use with registered custom fields

coverage/.last_run.json

@@ -1,5 +1,5 @@
 {
   "result": {
-    "covered_percent": 89.25
+    "covered_percent": 89.41
   }
 }

extensions/custom_field/preloader.rb

@@ -4,7 +4,7 @@ module CustomWizardCustomFieldPreloader
       @cw_klass = objects.first.class.name.underscore
       if cw_fields.any?
         cw_fields.each do |field|
-          fields << field.name
+          fields << field[:name]
         end
       end
     end

extensions/custom_field/serializer.rb

@@ -8,9 +8,9 @@ module CustomWizardCustomFieldSerializer
       if cw_fields.any?
         cw_fields.each do |field|
           if @cw_klass == "topic_view"
-            hash[field.name.to_sym] = object.topic.custom_fields["#{field.name}"]
+            hash[field[:name].to_sym] = object.topic.custom_fields["#{field[:name]}"]
           else
-            hash[field.name.to_sym] = object.custom_fields["#{field.name}"]
+            hash[field[:name].to_sym] = object.custom_fields["#{field[:name]}"]
           end
         end
       end

lib/custom_wizard/action.rb

@@ -454,7 +454,7 @@ class CustomWizard::Action
         user: user
       ).perform
       
-      registered_fields = CustomWizard::CustomField.list
+      registered_fields = CustomWizard::CustomField.cached_list
       
       field_map.each do |field|
         keyArr = field[:key].split('.')
@@ -468,9 +468,9 @@ class CustomWizard::Action
         end
          
         
-        registered = registered_fields.select { |f| f.name == name }
+        registered = registered_fields.select { |f| f[:name] == name }
         if registered.first.present?
-          klass = registered.first.klass
+          klass = registered.first[:klass]
         end
                 
         if klass === 'topic'

lib/custom_wizard/cache.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+class ::CustomWizard::Cache
+  def initialize(key)
+    @key = "#{CustomWizard::PLUGIN_NAME}_#{key}"
+  end
+  
+  def read
+    cache.read(@key)
+  end
+  
+  def write(data)
+    synchronize { cache.write(@key, data) }
+  end
+  
+  def delete
+    synchronize { cache.delete(@key) }
+  end
+  
+  def synchronize
+    DistributedMutex.synchronize(@key) { yield }
+  end
+  
+  def cache
+    @cache ||= Discourse.cache
+  end
+  
+  def self.wrap(key, &block)
+    c = new(key)
+        
+    if cached = c.read
+      cached
+    else
+      result = block.call()
+      c.write(result)
+      result
+    end
+  end
+end

lib/custom_wizard/custom_field.rb

@@ -18,6 +18,7 @@ class ::CustomWizard::CustomField
     post: ["post"]
   }
   TYPES ||= ["string", "boolean", "integer", "json"]
+  LIST_CACHE_KEY ||= 'custom_field_list'
   
   def self.serializers
     CLASSES.values.flatten.uniq
@@ -120,22 +121,29 @@ class ::CustomWizard::CustomField
     errors.blank?
   end
   
-  def self.reset
-    @list = nil
-    @any = nil
-  end
-  
   def self.list
-    @list ||= PluginStoreRow.where(plugin_name: NAMESPACE)
-      .map { |record| create_from_store(record) }
+    PluginStoreRow.where(plugin_name: NAMESPACE).map do |record|
+      create_from_store(record)
+    end
   end
   
-  def self.list_by(attr, value)
-    self.list.select do |cf|
+  def self.cached_list
+    ::CustomWizard::Cache.wrap(LIST_CACHE_KEY) do
+      PluginStoreRow.where(plugin_name: NAMESPACE).map do |record|
+        create_from_store(record).as_json.with_indifferent_access
+      end
+    end
+  end
+  
+  def self.list_by(attr, value, cached: true)
+    attr = attr.to_sym
+    fields = cached ? cached_list : list
+    
+    fields.select do |cf|
       if attr == :serializers
-        cf.send(attr).include?(value)
+        cf[attr].include?(value)
       else
-        cf.send(attr) == value
+        cf[attr] == value
       end
     end
   end
@@ -196,17 +204,13 @@ class ::CustomWizard::CustomField
   end
   
   def self.invalidate_cache
-    self.reset
+    CustomWizard::Cache.new(LIST_CACHE_KEY).delete
     Discourse.clear_readonly!
     Discourse.request_refresh!
   end
   
   def self.any?
-    if @any.nil?
-      @any = PluginStoreRow.where(plugin_name: NAMESPACE).exists?
-    else
-      @any
-    end
+    cached_list.length > 0
   end
   
   def self.enabled?

lib/custom_wizard/engine.rb

@@ -1,6 +1,10 @@
+# frozen_string_literal: true
+
 module ::CustomWizard
+  PLUGIN_NAME ||= 'custom_wizard'
+  
   class Engine < ::Rails::Engine
-    engine_name 'custom_wizard'
+    engine_name PLUGIN_NAME
     isolate_namespace CustomWizard
   end
 end

lib/custom_wizard/template.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CustomWizard::Template
   include HasErrors
   
@@ -19,7 +21,7 @@ class CustomWizard::Template
         
     ActiveRecord::Base.transaction do
       schedule_save_jobs unless opts[:skip_jobs]
-      PluginStore.set('custom_wizard', @data[:id], @data)
+      PluginStore.set(CustomWizard::PLUGIN_NAME, @data[:id], @data)
     end
     
     @data[:id]
@@ -30,7 +32,7 @@ class CustomWizard::Template
   end
   
   def self.find(wizard_id)
-    PluginStore.get('custom_wizard', wizard_id)
+    PluginStore.get(CustomWizard::PLUGIN_NAME, wizard_id)
   end
   
   def self.remove(wizard_id)
@@ -39,7 +41,7 @@ class CustomWizard::Template
     return false if !wizard
     
     ActiveRecord::Base.transaction do      
-      PluginStore.remove('custom_wizard', wizard.id)
+      PluginStore.remove(CustomWizard::PLUGIN_NAME, wizard.id)
       
       if wizard.after_time
         Jobs.cancel_scheduled_job(:set_after_time_wizard)

plugin.rb

@@ -55,6 +55,7 @@ after_initialize do
     ../lib/custom_wizard/action_result.rb
     ../lib/custom_wizard/action.rb
     ../lib/custom_wizard/builder.rb
+    ../lib/custom_wizard/cache.rb
     ../lib/custom_wizard/custom_field.rb
     ../lib/custom_wizard/field.rb
     ../lib/custom_wizard/mapper.rb
@@ -178,7 +179,7 @@ after_initialize do
           klass.to_s
             .classify
             .constantize
-            .register_custom_field_type(field.name, field.type.to_sym)
+            .register_custom_field_type(field[:name], field[:type].to_sym)
         end
       end
     end

spec/components/custom_wizard/cache_spec.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require_relative '../../plugin_helper.rb'
+
+describe CustomWizard::Cache do
+  it "writes and reads values to the cache" do
+    CustomWizard::Cache.new('list').write([1,2,3])
+    expect(CustomWizard::Cache.new('list').read).to eq([1,2,3])
+  end
+  
+  it "deletes values from the cache" do
+    CustomWizard::Cache.new('list').delete
+    expect(CustomWizard::Cache.new('list').read).to eq(nil)
+  end
+  
+  describe "#wrap" do
+    before do
+      @raw = [1,2,3]
+    end
+    
+    def list
+      CustomWizard::Cache.wrap('list') { @raw }
+    end
+    
+    it "returns value from passed block" do
+      expect(list).to eq([1,2,3])
+    end
+    
+    it "returns cached value" do
+      cached = list
+      @raw = [3,2,1]
+      expect(list).to eq(cached)
+    end
+  end
+end

spec/components/custom_wizard/custom_field_spec.rb

@@ -10,6 +10,10 @@ describe CustomWizard::CustomField do
     ).read)
   }
   
+  before do
+    CustomWizard::CustomField.invalidate_cache
+  end
+  
   it "saves custom field records" do
     custom_field_json['custom_fields'].each do |field_json|
       custom_field = CustomWizard::CustomField.new(nil, field_json)
@@ -184,7 +188,6 @@ describe CustomWizard::CustomField do
   end
   
   it "is not enabled if there are no custom fields" do
-    CustomWizard::CustomField.invalidate_cache
     expect(CustomWizard::CustomField.enabled?).to eq(false)
   end
 end