python-celery定时提交任务

pip install celery

使用消息中间件：RabbitMQ/Redis

app=Celery('任务名'，backend='xxx',broker='xxx')

基本使用

import celery
import time
# broker='redis://127.0.0.1:6379/2' 不加密码
backend='redis://:123456@127.0.0.1:6379/1'
broker='redis://:123456@127.0.0.1:6379/2'
cel=celery.Celery('test',backend=backend,broker=broker)
@cel.task
def add(x,y):
    return x+y

框架结构

pro_cel
    ├── celery_task# celery相关文件夹
    │   ├── celery.py   # celery连接和配置相关文件,必须叫这个名字
    │   └── tasks1.py    #  所有任务函数
    │    └── tasks2.py    #  所有任务函数
    ├── check_result.py # 检查结果
    └── send_task.py    # 触发任务

手动添加任务

from celery_app_task import add
result = add.delay(4,5)
print(result.id)
 

result查看结果

from celery.result import AsyncResult
from celery_app_task import cel

async = AsyncResult(id="e919d97d-2938-4d0f-9265-fd8237dc2aa3", app=cel)

if async.successful():
    result = async.get()
    print(result)
    # result.forget() # 将结果删除
elif async.failed():
    print('执行失败')
elif async.status == 'PENDING':
    print('任务等待中被执行')
elif async.status == 'RETRY':
    print('任务异常后正在重试')
elif async.status == 'STARTED':
    print('任务已经开始被执行')

定时任务

from celery_app_task import add
from datetime import datetime

# 方式一
# v1 = datetime(2019, 2, 13, 18, 19, 56)
# print(v1)
# v2 = datetime.utcfromtimestamp(v1.timestamp())
# print(v2)
# result = add.apply_async(args=[1, 3], eta=v2)
# print(result.id)

# 方式二
ctime = datetime.now()
# 默认用utc时间
utc_ctime = datetime.utcfromtimestamp(ctime.timestamp())
from datetime import timedelta
time_delay = timedelta(seconds=10)
task_time = utc_ctime + time_delay

# 使用apply_async并设定时间
result = add.apply_async(args=[4, 3], eta=task_time)
print(result.id)

循环定时提交任务

from datetime import timedelta
from celery import Celery
from celery.schedules import crontab

cel = Celery('tasks', broker='redis://127.0.0.1:6379/1', backend='redis://127.0.0.1:6379/2', include=[
    'celery_task.tasks1',
    'celery_task.tasks2',
])
cel.conf.timezone = 'Asia/Shanghai'
cel.conf.enable_utc = False

cel.conf.beat_schedule = {
    # 名字随意命名
    'add-every-10-seconds': {
        # 执行tasks1下的test_celery函数
        'task': 'celery_task.tasks1.test_celery',
        # 每隔2秒执行一次
        # 'schedule': 1.0,
        # 'schedule': crontab(minute="*/1"),
        'schedule': timedelta(seconds=2),
        # 传递参数
        'args': ('test',)
    },
    # 'add-every-12-seconds': {
    #     'task': 'celery_task.tasks1.test_celery',
    #     每年4月11号，8点42分执行
    #     'schedule': crontab(minute=42, hour=8, day_of_month=11, month_of_year=4),
    #     'schedule': crontab(minute=42, hour=8, day_of_month=11, month_of_year=4),
    #     'args': (16, 16)
    # },
}