first steps towards an invoice worker

shop/management/commands/invoice-worker.py

@@ -0,0 +1,40 @@
+from django.core.management.base import BaseCommand
+from shop.pdf import generate_pdf_letter
+from shop.email import send_invoice_email
+
+
+class Command(BaseCommand):
+    args = 'none'
+    help = 'Send out invoices that has not been sent yet'
+
+    def handle(self, *args, **options):
+        self.stdout.write('Invoice worker running...')
+        while True:
+            ### check if we need to generate any invoices
+            for order in Order.objects.filter(paid=True, invoice__isnull=True):
+                ### generate invoice for this Order
+                Invoice.objects.create(order=order)
+
+            ### check if we need to send out any invoices
+            for invoice in Invoice.objects.filter(sent_to_customer=False):
+                ### generate PDF invoice
+                try:
+                    pdffile = generate_pdf_letter('invoice.html', formatdict)
+                except Exception as E:
+                    self.stdout.write('ERROR: Unable to generate PDF file. Error: %s' % E)
+                    continue
+                if not pdffile:
+                    self.stdout.write('ERROR: Unable to generate PDF file')
+                    continue
+
+                if send_invoice_email(recipient=invoice.order.user.email, invoice=invoice, attachment=pdffile):
+                    self.stdout.write('OK: Invoice email sent to %s' % order.user.email)
+                    invoice.sent_to_customer=True
+                    invoice.save()
+                else:
+                    self.stdout.write('ERROR: Unable to send invoice email to %s' % order.user.email)
+
+            ### pause for a bit
+            sleep(60)
+
+