[ongoing] generate achives async

app/models/accounting_period.rb

@@ -68,6 +68,10 @@ class AccountingPeriod < ActiveRecord::Base
     end
   end
 
+  def previous_period
+    AccountingPeriod.where('closed_at < ?', closed_at).order(closed_at: :desc).limit(1).last
+  end
+
   private
 
   def vat_history
@@ -81,47 +85,8 @@ class AccountingPeriod < ActiveRecord::Base
     key_dates.sort_by { |k| k[:date] }
   end
 
-  def to_json_archive(invoices, previous_file, last_checksum)
-    code_checksum = Checksum.code
-    ApplicationController.new.view_context.render(
-      partial: 'archive/accounting',
-      locals: {
-        invoices: invoices_with_vat(invoices),
-        period_total: period_total,
-        perpetual_total: perpetual_total,
-        period_footprint: footprint,
-        code_checksum: code_checksum,
-        last_archive_checksum: last_checksum,
-        previous_file: previous_file,
-        software_version: Version.current,
-        date: Time.now.iso8601
-      },
-      formats: [:json],
-      handlers: [:jbuilder]
-    )
-  end
-
-  def previous_period
-    AccountingPeriod.where('closed_at < ?', closed_at).order(closed_at: :desc).limit(1).last
-  end
-
   def archive_closed_data
-    data = invoices.includes(:invoice_items).order(id: :asc)
+    ArchiveWorker.perform_async(id)
-    previous_file = previous_period&.archive_file
-    last_archive_checksum = previous_file ? Checksum.file(previous_file) : nil
-    json_data = to_json_archive(data, previous_file, last_archive_checksum)
-    current_archive_checksum = Checksum.text(json_data)
-    date = DateTime.iso8601
-    chained = Checksum.text("#{current_archive_checksum}#{last_archive_checksum}#{date}")
-
-    Zip::OutputStream.open(archive_file) do |io|
-      io.put_next_entry(archive_json_file)
-      io.write(json_data)
-      io.put_next_entry('checksum.sha256')
-      io.write("#{current_archive_checksum}\t#{archive_json_file}")
-      io.put_next_entry('chained.sha256')
-      io.write("#{chained}\t#{date}")
-    end
   end
 
   def price_without_taxe(invoice)

app/workers/archive_worker.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+# Will generate a ZIP archive file containing all invoicing data for the given period.
+# This file will be asynchronously generated by sidekiq and a notification will be sent to the requesting user when it's done.
+class ArchiveWorker
+  include Sidekiq::Worker
+
+  def perform(accounting_period_id)
+    period = AccountingPeriod.find(accounting_period_id)
+
+    data = period.invoices.includes(:invoice_items).order(id: :asc)
+    previous_file = period.previous_period&.archive_file
+    last_archive_checksum = previous_file ? Checksum.file(previous_file) : nil
+    json_data = to_json_archive(period, data, previous_file, last_archive_checksum)
+    current_archive_checksum = Checksum.text(json_data)
+    date = DateTime.iso8601
+    chained = Checksum.text("#{current_archive_checksum}#{last_archive_checksum}#{date}")
+
+    Zip::OutputStream.open(period.archive_file) do |io|
+      io.put_next_entry(period.archive_json_file)
+      io.write(json_data)
+      io.put_next_entry('checksum.sha256')
+      io.write("#{current_archive_checksum}\t#{period.archive_json_file}")
+      io.put_next_entry('chained.sha256')
+      io.write("#{chained}\t#{date}")
+    end
+
+    NotificationCenter.call type: :notify_admin_archive_complete,
+                            receiver: period.closed_by,
+                            attached_object: period
+  end
+
+  private
+
+  def to_json_archive(period, invoices, previous_file, last_checksum)
+    code_checksum = Checksum.code
+    ApplicationController.new.view_context.render(
+      partial: 'archive/accounting',
+      locals: {
+        invoices: period.invoices_with_vat(invoices),
+        period_total: period.period_total,
+        perpetual_total: period.perpetual_total,
+        period_footprint: period.footprint,
+        code_checksum: code_checksum,
+        last_archive_checksum: last_checksum,
+        previous_file: previous_file,
+        software_version: Version.current,
+        date: Time.now.iso8601
+      },
+      formats: [:json],
+      handlers: [:jbuilder]
+    )
+  end
+end