Batch Aggregation mailer

app/controllers/api/v1/aggregations_controller.rb

@@ -22,4 +22,10 @@ def create
   rescue AggregationClient::ConnectionError
     json_api_render(:service_unavailable, 'The aggregation service is unavailable or not responding')
   end
+
+  def update
+    super do |agg|
+      AggregationCompletedMailerWorker.perform_async(agg.id) if update_params[:status]
+    end
+  end
 end

app/mailers/aggregation_completed_mailer.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class AggregationCompletedMailer < ApplicationMailer
+  layout false
+
+  def aggregation_complete(agg)
+    @user = User.find(agg.user_id)
+    @email_to = @user.email
+    base_url = ENV.fetch('AGGREGATION_STORAGE_BASE_URL', '')
+    @zip_url = "#{base_url}/#{agg.uuid}/#{agg.uuid}.zip"
+    @reductions_url = "#{base_url}/#{agg.uuid}/reductions.csv"
+
+    @success = agg.completed?
+    agg_status = @success ? 'was successful!' : 'failed'
+    subject = "Your workflow aggregation #{agg_status}"
+
+    mail(to: @email_to, subject: subject)
+  end
+end

app/views/aggregation_completed_mailer/aggregation_complete.text.erb

@@ -0,0 +1,34 @@
+Hello,
+
+Your workflow aggregation has finished processing.
+
+<% if @success %>
+The workflow was aggregated successfully.
+
+Click here to download a zip file containing the following:
+  * Workflow classifications export
+  * Workflow export
+  * Extracts (one file per task)
+  * Reductions
+
+<%= @zip_url %>
+
+Click here to download the reductions file by itself:
+
+<%= @reductions_url %>
+
+<% else %>
+The workflow failed to aggregate. Please contact us or try again.
+<% end %>
+
+If you have questions or if there were any issues with your aggregation, please email [email protected].
+
+Cheers,
+The Zooniverse Team
+
+This is an automated email, please do not respond.
+
+To manage your Zooniverse email subscription preferences visit https://zooniverse.org/settings
+
+To unsubscribe to all Zooniverse messages please visit https://zooniverse.org/unsubscribe
+Please be aware that the above link will unsubscribe you from ALL Zooniverse emails.

app/workers/aggregation_completed_mailer_worker.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class AggregationCompletedMailerWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :data_high
+
+  def perform(agg_id)
+    aggregation = Aggregation.find(agg_id)
+    AggregationCompletedMailer.aggregation_complete(aggregation).deliver_now
+  end
+end

kubernetes/deployment-production.tmpl

@@ -121,6 +121,7 @@ data:
   TALK_API_APPLICATION: '1'
   USER_SUBJECT_LIMIT: '10000'
   AGGREGATION_HOST: http://aggregation-caesar/
+  AGGREGATION_STORAGE_BASE_URL: https://aggregationdata.blob.core.windows.net
 ---
 apiVersion: apps/v1
 kind: Deployment

kubernetes/deployment-staging.tmpl

@@ -110,6 +110,7 @@ data:
   TALK_API_APPLICATION: '1'
   USER_SUBJECT_LIMIT: '100'
   AGGREGATION_HOST: http://aggregation-staging-app/
+  AGGREGATION_STORAGE_BASE_URL: https://aggregationdata.blob.core.windows.net
 ---
 apiVersion: apps/v1
 kind: Deployment

spec/controllers/api/v1/aggregations_controller_spec.rb

@@ -107,6 +107,26 @@
     end
 
     it_behaves_like 'is updatable'
+
+    context 'with the mailer worker' do
+      before do
+        default_request scopes: scopes, user_id: authorized_user.id
+        allow(AggregationCompletedMailerWorker).to receive(:perform_async).with(resource.id)
+      end
+
+      let(:params) { update_params.merge(id: resource.id) }
+
+      it 'calls the mailer worker' do
+        put :update, params: params
+        expect(AggregationCompletedMailerWorker).to have_received(:perform_async).with(resource.id)
+      end
+
+      it 'does not call the mailer if status is not an updated param' do
+        params[:aggregations].delete(:status)
+        put :update, params: params
+        expect(AggregationCompletedMailerWorker).not_to have_received(:perform_async)
+      end
+    end
   end
 
   describe '#destroy' do

spec/mailers/aggregation_completed_mailer_spec.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe AggregationCompletedMailer, type: :mailer do
+  let(:base_url) { 'https://example.com' }
+
+  before do
+    allow(ENV).to receive(:fetch).with('AGGREGATION_STORAGE_BASE_URL', '').and_return(base_url)
+  end
+
+  describe '#aggregation_complete' do
+    let(:mail) { described_class.aggregation_complete(aggregation) }
+
+    context 'with a successful aggregation' do
+      let(:aggregation) { create(:aggregation, status: 'completed', uuid: 'asdf123asdf') }
+      let(:uuid) { aggregation.uuid }
+
+      it 'mails the user' do
+        expect(mail.to).to match_array([aggregation.user.email])
+      end
+
+      it 'includes the subject' do
+        expect(mail.subject).to include('Your workflow aggregation was successful!')
+      end
+
+      it 'includes the zip file link' do
+        expect(mail.body.encoded).to include("#{base_url}/#{uuid}/#{uuid}.zip")
+      end
+
+      it 'includes the reductions file link' do
+        expect(mail.body.encoded).to include("#{base_url}/#{uuid}/reductions.csv")
+      end
+
+      it 'comes from [email protected]' do
+        expect(mail.from).to include('[email protected]')
+      end
+
+      it 'has the success statement' do
+        expect(mail.body.encoded).to include('The workflow was aggregated successfully.')
+      end
+    end
+
+    context 'with a failed aggregation' do
+      let(:aggregation) { create(:aggregation, status: 'failed') }
+
+      it 'reports the failures statement' do
+        expect(mail.body.encoded).to include('The workflow failed to aggregate.')
+      end
+    end
+  end
+end

spec/workers/aggregation_completed_mailer_worker_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe AggregationCompletedMailerWorker do
+  let(:aggregation) { create(:aggregation) }
+
+  it 'delivers the mail' do
+    expect { described_class.new.perform(aggregation.id) }.to change { ActionMailer::Base.deliveries.count }.by(1)
+  end
+
+  context 'with missing attributes' do
+    it 'is missing an aggregation and does not send' do
+      expect { described_class.new.perform(nil) }.to not_change { ActionMailer::Base.deliveries.count }
+        .and raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+end