Redesign plugins system

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/services/system_hooks_service.rb

@@ -14,14 +14,7 @@ class SystemHooksService
       hook.async_execute(data, 'system_hooks')
     end
 
-    # Execute external plugins
-    Gitlab::Plugin.all.each do |plugin|
-      begin
-        plugin.new.execute(data)
-      rescue => e
-        Rails.logger.warn("GitLab -> Plugins -> #{plugin.class.name} raised an axception during execution. #{e}")
-      end
-    end
+    Gitlab::Plugin.execute_all_async(data)
   end
 
   private

app/workers/plugin_worker.rb

+class PluginWorker
+  include ApplicationWorker
+
+  sidekiq_options retry: false
+
+  def perform(file_name, data)
+    Gitlab::Plugin.execute(file_name, data)
+  end
+end

lib/gitlab/plugin.rb

 module Gitlab
   module Plugin
-    def self.all
-      files.map do |file|
-        file_name = File.basename(file, '.rb')
+    def self.files
+      Dir.glob(Rails.root.join('plugins', '*_plugin.rb'))
+    end
 
-        # Just give sample data to method and expect it to not crash.
-        begin
-          klass = Object.const_get(file_name.classify)
-          klass.new.execute(Gitlab::DataBuilder::Push::SAMPLE_DATA)
-        rescue => e
-          Rails.logger.warn("GitLab -> Plugins -> #{file_name} raised an exception during boot check. #{e}")
-          next
-        else
-          Rails.logger.info "GitLab -> Plugins -> #{file_name} passed validation check"
-          klass
-        end
+    def self.execute_all_async(data)
+      files.each do |file|
+        PluginWorker.perform_async(file, data)
       end
     end
 
-    def self.files
-      Dir.glob(Rails.root.join('plugins', '*_plugin.rb'))
+    def self.execute(file, data)
+      # TODO: Implement
+      #
+      # Reuse some code from gitlab-shell https://gitlab.com/gitlab-org/gitlab-shell/blob/master/lib/gitlab_custom_hook.rb#L40
+      # Pass data as STDIN (or JSON encode?)
+      #
+      # 1. Return true if 0 exit code
+      # 2. Return false if non-zero exit code
     end
   end
 end

lib/tasks/plugins.rake

@@ -27,13 +27,13 @@ namespace :plugins do
   task validate: :environment do
     puts 'Validating plugins from /plugins directory'
 
-    Gitlab::Plugin.all.each do |plugin|
-      begin
-        plugin.new.execute(Gitlab::DataBuilder::Push::SAMPLE_DATA)
-      rescue => e
-        puts "- #{plugin} raised an exception during boot check. #{e}"
+    Gitlab::Plugin.files.each do |file|
+      result = Gitlab::Plugin.execute(file, Gitlab::DataBuilder::Push::SAMPLE_DATA)
+
+      if result
+        puts "* #{file} succeed (zero exit code)"
       else
-        puts "- #{plugin} passed validation check"
+        puts "* #{file} failure (non-zero exit code)"
       end
     end
   end