Move lib files inside a discourse_chat directory, and make the notifications run on a delay after post creation

config/settings.yml

@@ -3,3 +3,5 @@ plugins:
     default: false
   chat_discourse_username:
     default: system
+  chat_delay_seconds:
+    default: 20

plugin.rb

@@ -33,13 +33,27 @@ after_initialize do
     end
   end
 
-  require_relative "lib/provider"
-  require_relative "lib/manager"
-  require_relative "lib/rule"
+  require_relative "lib/discourse_chat/provider"
+  require_relative "lib/discourse_chat/manager"
+  require_relative "lib/discourse_chat/rule"
+
+  module ::Jobs
+    class NotifyChats < Jobs::Base
+      def execute(args)
+        return if not SiteSetting.chat_enabled? # Plugin may have been disabled since job triggered
+
+        ::DiscourseChat::Manager.trigger_notifications(args[:post_id])
+      end
+    end
+  end
 
   DiscourseEvent.on(:post_created) do |post| 
     if SiteSetting.chat_enabled?
-      ::DiscourseChat::Manager.trigger_notifications(post.id)
+      # This will run for every post, even PMs. Don't worry, they're filtered out later.
+      Jobs.enqueue_in(SiteSetting.chat_delay_seconds.seconds,
+          :notify_chats,
+          post_id: post.id
+        )
     end
   end
 

spec/jobs/notify_chats_spec.rb

@@ -0,0 +1,50 @@
+require 'rails_helper'
+
+RSpec.describe PostCreator do
+  let(:first_post) { Fabricate(:post) }
+  let(:topic) { Fabricate(:topic, posts: [first_post]) }
+
+  before do
+    SiteSetting.queue_jobs = true
+    Jobs::NotifyChats.jobs.clear
+  end
+
+  describe 'when a post is created' do
+    describe 'when plugin is enabled' do
+      before do
+        SiteSetting.chat_enabled = true
+      end
+
+      it 'should schedule a chat notification job' do
+        Timecop.freeze do
+          post = PostCreator.new(topic.user,
+            raw: 'Some post content',
+            topic_id: topic.id
+          ).create!
+
+          job = Jobs::NotifyChats.jobs.last
+
+          expect(job['at'])
+            .to eq((Time.zone.now + SiteSetting.chat_delay_seconds.seconds).to_f)
+
+          expect(job['args'].first['post_id']).to eq(post.id)
+        end
+      end
+    end
+
+    describe 'when plugin is not enabled' do
+      before do
+        SiteSetting.chat_enabled = false
+      end
+
+      it 'should not schedule a job for chat notifications' do
+        PostCreator.new(topic.user,
+          raw: 'Some post content',
+          topic_id: topic.id
+        ).create!
+
+        expect(Jobs::NotifyChats.jobs).to eq([])
+      end
+    end
+  end
+end