django-simpletask2 0.0.8

A simple asynchronous task manager based on the Django framework. All business logic written in a custom task data model. Tasks are triggered by a Redis queue.

django-simpletask2

A simple asynchronous task manager based on the Django framework. All business logic written in a custom task data model. Tasks are triggered by a Redis queue.

Install

pip install django-simpletask2

Usage

pro/settings.py

INSTALLED_APPS = [
    ...
    'django_simpletask2',
    ...
]

# requires redis cache backend, see django-redis for detail
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://:xxx@xxx:6379/0?decode_responses=True",
    }
}

DJANGO_SIMPLETASK2_TASK_PULL_TIMEOUT = 5 # optional, default to 5
DJANGO_SIMPLETASK2_REDIS_NAME = "default" # optional, default to "default"
DJANGO_SIMPLETASK2_ACLKEY = "Bqud27SzhUymXDuBfvYNHJWQm0i4FdUB" # optional, default to settings.SECRET_KEY

pro/urls.py

from django.urls import path
from django.urls import include

urlpatterns = [
    ...
    path('django-simpletask2/', include("django_simpletask2.urls")),
    ....
]

app/models.py

import base64
from django.db import models
from django_simpletask2.models import SimpleTask


class HelloTask(SimpleTask):
    name = models.CharField(max_length=64)

    def do_task_main(self, payload):
        return "Hello, {}. Nice to meet you!".format(self.name)

class WorldTask(SimpleTask):
    url = models.CharField(max_length=128)
    content = models.TextField(null=True, blank=True)

    is_multi_steps = True
    final_step = 2

    def do_task_main_step1(self, payload=None):
        return {
            "proxy": {
                "method": "GET",
                "url": self.url,
            }
        }
    
    def do_task_main_step2(self, payload=None):
        payload = payload or {}
        base64content = payload.get("proxied_content", None)
        if base64content:
            try:
                content = base64.decodebytes(base64content.encode()).decode("utf-8")
                success = True
            except UnicodeDecodeError:
                try:
                    content = base64.decodebytes(base64content.encode()).decode("gb18030")
                    success = True
                except UnicodeDecodeError:
                    content = "failed to decode proxied_content: {0}".format(base64content)
                    success = False
        else:
            content = payload.get("proxied_error", None)
            success = False

        self.content = content
        self.save()

        if success:
            return True
        else:
            raise RuntimeError("WorldTask.do_task_main_step2 failed....")

etc/django-simpletask2-server-config.yml

redis: "redis://:xxx@xxx:6379/0?decode_responses=True"
channels: default
server: https://localhost:80000/django-simpletask2/
aclkey: xxxx
task-pull-engine: redis
threads: 1
idle-sleep: 5
error-sleep: 5
auto-reset-task-interval: 60
do-auto-reset-task: true

Start django-simpletask2-server to trigger tasks

django-simpletask2-server --config etc/django-simpletask2-server-config.yml start

Error Codes

Code	Message
2910000	system error.
2910001	please send request parameters in PAYLOAD format.
2910002	aclkey field is required.
2910003	aclkey is wrong and access denied.
2910004	got an already deleted task {task_info}, you may ignore this and continue.
2910005	bad formatted task_info: {task_info}.
2910006	Simple task model {task_class_name} not exists.
2910007	task handler is not implemented, task={app_label}.{model_name}, handler={}.
2910008	task status is not READY but {status}, you can not start it.
2910009	calling {handler_name} failed with error message: {error}.
2910010	save task done status failed with error message: {error}.
2910011	task_info field is required for a multi-steps task. payload={payload}.
2910012	got NO task in channels: {channels}.
2910013	task {task_info} locked by another worker.
2910014	task {app_label}.{model_name}:{task_id} failed to save status with error message: {error}.
2910015	task_info field is required.
2910016	get task instance {task_info} failed with error: {error}.

Releases

v0.0.1

• First release.

v0.0.4

• Fixed the problem that the task duplicately executed for the task queue is too long.

v0.0.5

• Fix do_task problem in actions.
• Fix ugettext_lazy problem.
• Fix problems in django 4.x.

v0.0.6

• Doc update.

v0.0.7

• Fix error message formatting problem.

v0.0.8

• Push to mq after instance-create-transaction committed.