From bc273f17cd8e08c6944660b8633ba41763f292b2 Mon Sep 17 00:00:00 2001
From: Filipp Lepalaan <filipp@mac.com>
Date: Sun, 6 Jun 2021 14:33:41 +0300
Subject: Migrate Celery to RQ

---
 README.md                              |  5 +++--
 requirements.pip                       |  1 +
 servo/management/commands/scheduler.py | 28 ++++++++++++++++++++++++++++
 servo/tasks.py                         | 24 +++++++++++-------------
 wsgi.py                                |  2 +-
 5 files changed, 44 insertions(+), 16 deletions(-)
 create mode 100644 servo/management/commands/scheduler.py

diff --git a/README.md b/README.md
index 207a1dd..feb29f9 100644
--- a/README.md
+++ b/README.md
@@ -54,9 +54,10 @@ For testing, you can run Servo without any extra setup:
 	$ cd my_servo_folder
 	$ python ./manage.py runserver
 
-If you want to run rules, set ENABLE_RULES = True and start the worker task:
+If you want to run rules, set ENABLE_RULES = True and start the worker task and scheduler:
 
-	$ celery -A servo worker -B -l info -s /tmp/celerybeat-schedule
+	$ ./manage.py rqworker &
+	$ ./manage.py scheduler
 
 Then fire up your browser and got to [http://localhost:8000/](http://localhost:8000/)
 
diff --git a/requirements.pip b/requirements.pip
index fc423a9..f385ea3 100644
--- a/requirements.pip
+++ b/requirements.pip
@@ -16,6 +16,7 @@ python-dateutil
 python-barcode
 rq
 django-rq
+rq-scheduler
 chardet
 html2text
 python-magic
diff --git a/servo/management/commands/scheduler.py b/servo/management/commands/scheduler.py
new file mode 100644
index 0000000..18018e5
--- /dev/null
+++ b/servo/management/commands/scheduler.py
@@ -0,0 +1,28 @@
+from datetime import datetime
+
+import django_rq
+from django.core.management.base import BaseCommand
+from django_rq.management.commands import rqscheduler
+
+
+from servo.tasks import check_mail
+
+
+scheduler = django_rq.get_scheduler('default')
+
+
+class Command(rqscheduler.Command):
+
+    help = "Start task scheduler"
+
+    def handle(self, *args, **kwargs):
+        for job in scheduler.get_jobs():
+            job.delete()
+
+        scheduler.schedule(
+            scheduled_time=datetime.utcnow(), # Time for first execution, in UTC timezone
+            func=check_mail, # Function to be queued
+            interval=300, # Time before the function is called again, in seconds
+        )
+
+        super(Command, self).handle(*args, **kwargs)
diff --git a/servo/tasks.py b/servo/tasks.py
index bc5bf77..1d55136 100644
--- a/servo/tasks.py
+++ b/servo/tasks.py
@@ -1,10 +1,7 @@
 # -*- coding: utf-8 -*-
-
-from __future__ import absolute_import
-
-from email.parser import Parser
-
-from celery import shared_task
+import email
+import logging
+from email.parser import BytesParser
 
 from django.conf import settings
 from django.core.cache import cache
@@ -32,7 +29,6 @@ def get_rules():
     return rules
 
 
-@shared_task
 def apply_rules(event):
     """
     Applies configured rules
@@ -100,7 +96,6 @@ def apply_rules(event):
     return '%d/%d rules processed' % (counter, len(rules))
 
 
-@shared_task
 def batch_process(user, data):
     """
     /orders/batch
@@ -161,24 +156,26 @@ def batch_process(user, data):
     return '%d/%d orders processed' % (processed, len(orders))
 
 
-@shared_task
 def check_mail():
-    """Checks IMAP box for incoming mail"""
+    """
+    Checks IMAP box for incoming mail
+    """
     uid = Configuration.conf('imap_act')
 
     if empty(uid):
-        raise ConfigurationError('Incoming message user not configured')
+        err = 'User account for incoming messages not configured'
+        raise ConfigurationError(err)
 
     counter = 0
     user = User.objects.get(pk=uid)
     server = Configuration.get_imap_server()
+
     typ, data = server.search(None, "UnSeen")
 
     for num in data[0].split():
-        #logging.debug("** Processing message %s" % num)
         typ, data = server.fetch(num, "(RFC822)")
         # parsestr() seems to return an email.message?
-        msg = Parser().parsestr(data[0][1])
+        msg = BytesParser().parsebytes(data[0][1])
         Note.from_email(msg, user)
         #server.copy(num, 'servo')
         server.store(num, '+FLAGS', '\\Seen')
@@ -188,3 +185,4 @@ def check_mail():
     server.logout()
 
     return '%d messages processed' % counter
+
diff --git a/wsgi.py b/wsgi.py
index ee2cda3..86460bd 100644
--- a/wsgi.py
+++ b/wsgi.py
@@ -1,5 +1,5 @@
 """
-WSGI config for servo3 project.
+WSGI config for servo project.
 
 This module contains the WSGI application used by Django's development server
 and any production WSGI deployments. It should expose a module-level variable
-- 
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