[#139] Send conversation emails (#442)

* [#139] Delayed emails for conversations

* Added the setex and get methods to Redis wrapper
* Set the priorities for the sidekiq queues
* Was not able to use mailhog for testing email in local, switched back to letter opener and added comments on using the SMTP settings
* Added after create hood in messages to queue the sending of mail after 2 minutes using sidekiq worker and also set the redis key for the conversation to avoid the email sending for every message
* Added the sidekiq worker to send the email and delete the conversation redis key
* Added the mailer and mail template
* mailer sends the last 10 messages along with the new messages from the time it was queued

* Send email only in development or if smtp config is set

* Send email only in development or if smtp config is set
* Set the SMTP_PORT in production variable

* Adding redis to circle CI

* Specs for the conversation email changes

* Added specs for conversation email sidekiq worker
* Added specs for conversation mailer
* Added specs in message model for the after create hook for notify email

* Send emails only when there is a reply from agent

* set development to use mailhog

* Adding comments for using letter opener

.circleci/config.yml

@@ -13,6 +13,7 @@ defaults: &defaults
     # CircleCI maintains a library of pre-built images
     # documented at https://circleci.com/docs/2.0/circleci-images/
     - image: circleci/postgres:9.4
+    - image: circleci/redis:5.0.7-alpine
   environment:
       - CC_TEST_REPORTER_ID: b1b5c4447bf93f6f0b06a64756e35afd0810ea83649f03971cbf303b4449456f
 

.env.example

@@ -17,6 +17,8 @@ FB_APP_ID=
 MAILER_SENDER_EMAIL=accounts@chatwoot.com
 SMTP_PORT=1025
 SMTP_DOMAIN=chatwoot.com
+# if you are running docker-compose, set SMTP_ADDRESS value as "mailhog", 
+# else set the value as "localhost"
 SMTP_ADDRESS=mailhog
 SMTP_USERNAME=
 SMTP_PASSWORD=

.rubocop.yml

@@ -16,6 +16,10 @@ Style/FrozenStringLiteralComment:
   Enabled: false
 Style/SymbolArray:
   Enabled: false
+Style/GlobalVars:
+  Exclude:
+    - 'config/initializers/redis.rb'
+    - 'lib/redis/alfred.rb'
 Metrics/BlockLength:
   Exclude:
     - spec/**/*

app/mailers/application_mailer.rb

@@ -4,4 +4,8 @@ class ApplicationMailer < ActionMailer::Base
 
   # helpers
   helper :frontend_urls
+
+  def smtp_config_set_or_development?
+    ENV.fetch('SMTP_ADDRESS', nil).present? || Rails.env.development?
+  end
 end

app/mailers/assignment_mailer.rb

@@ -3,7 +3,7 @@ class AssignmentMailer < ApplicationMailer
   layout 'mailer'
 
   def conversation_assigned(conversation, agent)
-    return if ENV.fetch('SMTP_ADDRESS', nil).blank?
+    return unless smtp_config_set_or_development?
 
     @agent = agent
     @conversation = conversation

app/mailers/conversation_mailer.rb

@@ -0,0 +1,26 @@
+class ConversationMailer < ApplicationMailer
+  default from: ENV.fetch('MAILER_SENDER_EMAIL', 'accounts@chatwoot.com')
+  layout 'mailer'
+
+  def new_message(conversation, message_queued_time)
+    return unless smtp_config_set_or_development?
+
+    @conversation = conversation
+    @contact = @conversation.contact
+    @agent = @conversation.assignee
+
+    recap_messages = @conversation.messages.where('created_at < ?', message_queued_time).order(created_at: :asc).last(10)
+    new_messages = @conversation.messages.where('created_at >= ?', message_queued_time)
+
+    @messages = recap_messages + new_messages
+    @messages = @messages.select(&:reportable?)
+
+    mail(to: @contact&.email, from: @agent&.email, subject: mail_subject(@messages.last))
+  end
+
+  private
+
+  def mail_subject(last_message, trim_length = 30)
+    "[##{@conversation.display_id}] #{last_message.content.truncate(trim_length)}"
+  end
+end

app/models/message.rb

@@ -49,7 +49,8 @@ class Message < ApplicationRecord
   after_create :reopen_conversation,
                :dispatch_event,
                :send_reply,
-               :execute_message_template_hooks
+               :execute_message_template_hooks,
+               :notify_via_mail
 
   def channel_token
     @token ||= inbox.channel.try(:page_access_token)
@@ -94,4 +95,17 @@ class Message < ApplicationRecord
   def execute_message_template_hooks
     ::MessageTemplates::HookExecutionService.new(message: self).perform
   end
+
+  def notify_via_mail
+    conversation_mail_key = Redis::Alfred::CONVERSATION_MAILER_KEY % conversation.id
+    if Redis::Alfred.get(conversation_mail_key).nil? && conversation.contact.email? && outgoing?
+      # set a redis key for the conversation so that we don't need to send email for every
+      # new message that comes in and we dont enque the delayed sidekiq job for every message
+      Redis::Alfred.setex(conversation_mail_key, Time.zone.now)
+
+      # Since this is live chat, send the email after few minutes so the only one email with
+      # last few messages coupled together is sent rather than email for each message
+      ConversationEmailWorker.perform_in(2.minutes, conversation.id, Time.zone.now)
+    end
+  end
 end

app/views/conversation_mailer/new_message.html.erb

@@ -0,0 +1,16 @@
+<p>Hi <%= @contact.name %>,</p>
+
+<p>You have new messages on your conversation.</p>
+
+<table>
+    <% @messages.each do |message| %>
+        <tr>
+            <td>
+                <b><%= message.incoming? ? 'You' : message.user.name %></b>
+            </td>
+            <td>: <%= message.content %></td>
+        </tr>
+    <% end %>
+</table>
+
+<p>Click <%= link_to 'here', app_conversation_url(id: @conversation.display_id) %> to get back to the conversation. </p>

app/workers/conversation_email_worker.rb

@@ -0,0 +1,15 @@
+class ConversationEmailWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :mailers
+
+  def perform(conversation_id, queued_time)
+    @conversation = Conversation.find(conversation_id)
+
+    # send the email
+    ConversationMailer.new_message(@conversation, queued_time).deliver_later
+
+    # delete the redis set from the first new message on the conversation
+    conversation_mail_key = Redis::Alfred::CONVERSATION_MAILER_KEY % @conversation.id
+    Redis::Alfred.delete(conversation_mail_key)
+  end
+end

config/environments/development.rb

@@ -42,13 +42,17 @@ Rails.application.configure do
 
   config.action_mailer.perform_deliveries = true
   config.action_mailer.raise_delivery_errors = true
-  config.action_mailer.delivery_method = :smtp
   config.action_mailer.default_url_options = { host: 'localhost:3000' }
 
+  # If you want to use letter opener instead of mailhog for testing emails locally,
+  # uncomment the following line L49 and comment lines L51 through to L65
+  # config.action_mailer.delivery_method = :letter_opener
+
+  config.action_mailer.delivery_method = :smtp
   smtp_settings = {
-    port: ENV['SMTP_PORT'],
-    domain: ENV['SMTP_DOMAIN'],
-    address: ENV['SMTP_ADDRESS']
+    port: ENV['SMTP_PORT'] || 25,
+    domain: ENV['SMTP_DOMAIN'] || 'localhost',
+    address: ENV['SMTP_ADDRESS'] || 'chatwoot.com'
   }
 
   if ENV['SMTP_AUTHENTICATION'].present?

config/environments/production.rb

@@ -59,7 +59,7 @@ Rails.application.configure do
   config.action_mailer.default_url_options = { host: ENV['FRONTEND_URL'] }
   config.action_mailer.smtp_settings = {
     address: ENV['SMTP_ADDRESS'],
-    port: 587,
+    port: ENV['SMTP_PORT'] || 587,
     user_name: ENV['SMTP_USERNAME'],
     password: ENV['SMTP_PASSWORD'],
     authentication: :login,

config/initializers/redis.rb

@@ -2,5 +2,6 @@ uri = URI.parse(ENV.fetch('REDIS_URL', 'redis://127.0.0.1:6379'))
 redis = Rails.env.test? ? MockRedis.new : Redis.new(url: uri)
 Nightfury.redis = Redis::Namespace.new('reports', redis: redis)
 
-# Alfred - Used currently for Round Robin. Add here as you use it for more features
+# Alfred - Used currently for round robin and conversation emails.
+# Add here as you use it for more features
 $alfred = Redis::Namespace.new('alfred', redis: redis, warning: true)

config/sidekiq.yml

@@ -11,10 +11,10 @@
 # even put in dynamic logic, like a host-specific queue.
 # http://www.mikeperham.com/2013/11/13/advanced-sidekiq-host-specific-queues/
 :queues:
-  - critical
-  - default
-  - low
-  - mailers
+  - [critical, 5]
+  - [default, 2]
+  - [low, 1]
+  - [mailers, 2]
 
 # you can override concurrency based on environment
 production:

lib/redis/alfred.rb

@@ -1,4 +1,6 @@
 module Redis::Alfred
+  CONVERSATION_MAILER_KEY = 'CONVERSATION::%d'.freeze
+
   class << self
     def rpoplpush(source, destination)
       $alfred.rpoplpush(source, destination)
@@ -15,5 +17,13 @@ module Redis::Alfred
     def lrem(key, value, count = 0)
       $alfred.lrem(key, count, value)
     end
+
+    def setex(key, value, expiry = 1.day)
+      $alfred.setex(key, expiry, value)
+    end
+
+    def get(key)
+      $alfred.get(key)
+    end
   end
 end

spec/mailers/conversation_mailer_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe ConversationMailer, type: :mailer do
+  describe 'new_message' do
+    let(:agent) { create(:user, email: 'agent1@example.com') }
+    let(:conversation) { create(:conversation, assignee: agent) }
+    let(:message) { create(:message, conversation: conversation) }
+    let(:mail) { described_class.new_message(message.conversation, Time.zone.now).deliver_now }
+    let(:class_instance) { described_class.new }
+
+    before do
+      allow(described_class).to receive(:new).and_return(class_instance)
+      allow(class_instance).to receive(:smtp_config_set_or_development?).and_return(true)
+    end
+
+    it 'renders the subject' do
+      expect(mail.subject).to eq("[##{message.conversation.display_id}] #{message.content.truncate(30)}")
+    end
+
+    it 'renders the receiver email' do
+      expect(mail.to).to eq([message&.conversation&.contact&.email])
+    end
+
+    it 'renders the sender email' do
+      expect(mail.from).to eq([message&.conversation&.assignee&.email])
+    end
+  end
+end

spec/models/message_spec.rb

@@ -22,5 +22,11 @@ RSpec.describe Message, type: :model do
       expect(::MessageTemplates::HookExecutionService).to have_received(:new).with(message: message)
       expect(hook_execution_service).to have_received(:perform)
     end
+
+    it 'calls notify email method on after save' do
+      allow(message).to receive(:notify_via_mail).and_return(true)
+      message.save!
+      expect(message).to have_received(:notify_via_mail)
+    end
   end
 end

spec/rails_helper.rb

@@ -5,6 +5,7 @@ require File.expand_path('../config/environment', __dir__)
 abort('The Rails environment is running in production mode!') if Rails.env.production?
 require 'rspec/rails'
 require 'pundit/rspec'
+require 'sidekiq/testing'
 
 # Add additional requires below this line. Rails is not loaded until this point!
 

spec/workers/conversation_email_worker_spec.rb

@@ -0,0 +1,37 @@
+require 'rails_helper'
+
+Sidekiq::Testing.fake!
+RSpec.describe ConversationEmailWorker, type: :worker do
+  let(:perform_at) { (Time.zone.today + 6.hours).to_datetime }
+  let(:scheduled_job) { described_class.perform_at(perform_at, 1, Time.zone.now) }
+  let(:conversation) { build(:conversation, display_id: nil) }
+
+  describe 'testing ConversationEmailWorker' do
+    before do
+      conversation.save!
+      allow(Conversation).to receive(:find).and_return(conversation)
+      mailer = double
+      allow(ConversationMailer).to receive(:new_message).and_return(mailer)
+      allow(mailer).to receive(:deliver_later).and_return(true)
+    end
+
+    it 'worker jobs are enqueued in the mailers queue' do
+      described_class.perform_async
+      assert_equal :mailers, described_class.queue
+    end
+
+    it 'goes into the jobs array for testing environment' do
+      expect do
+        described_class.perform_async
+      end.to change(described_class.jobs, :size).by(1)
+      described_class.new.perform(1, Time.zone.now)
+    end
+
+    context 'with actions performed by the worker' do
+      it 'calls ConversationMailer' do
+        described_class.new.perform(1, Time.zone.now)
+        expect(ConversationMailer).to have_received(:new_message)
+      end
+    end
+  end
+end