Celery
celery的使用
异步任务框架,执行异步任务,执行延迟任务,执行定时任务
使用:pip install celery
基本结构
from celery import Celery
broker = 'redis://127.0.0.1:6379/1' # broker任务队列
backend = 'redis://127.0.0.1:6379/2' # 结构存储,执行完的结果存在这
app = Celery(__name__,broker=broker,backend=backend)
# 添加任务(使用这个装饰器装饰,@app.task)
@app.task
def add(x,y):
print(x,y)
return x+y
# 2.启动worker
# 用命令来执行
# 非windows
# 命令:celery worker -A celery_task -l info
# windows:
# pip3 install eventlet
# celery worker -A celery_task -l info -P eventlet
# 3.添加任务
from celery_task import add
ret = add.delay(5,4) #想broker中添加一个任务
print(ret)
# 查看结果
from celery.result import AsyncResult
id = '3eae0594-e23e-44de-84c3-f52e976a2fab'
if __name__ == '__main__':
async = AsyncResult(id=id, app=app)
if async.successful():
result = async.get()
print(result)
elif async.failed():
print('任务失败')
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')
包的结构
t_celery包
# add_task.py 任务
from celery_task import add
# add(3,4) # 直接执行,不会被添加到broker中
ret=add.delay(5,4) #想broker中添加一个任务
print(ret)
# celery_task.py # celery配置
from celery import Celery
broker='redis://127.0.0.1:6379/1' #broker任务队列
backend='redis://127.0.0.1:6379/2' # 结构存储,执行完的结果存在这
app=Celery(__name__,broker=broker,backend=backend)
#添加任务(使用这个装饰器装饰,@app.task)
@app.task
def add(x,y):
print(x,y)
return x+y
# get_result.py # 查看结果
from celery_task import app
from celery.result import AsyncResult
id = '3e397fd7-e0c1-4c5c-999c-2655a96793bb'
if __name__ == '__main__':
async = AsyncResult(id=id, app=app)
if async.successful():
result = async.get()
print(result)
elif async.failed():
print('任务失败')
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')
# 命令:celery worker -A celery_task -l info
# windows:
# pip3 install eventlet
# celery worker -A celery_task -l info -P eventlet
开启任务
因为celery是一个独立的项目,所以建立一个包
里面创建一个celery.py
# celery_task/celery.py
from celery import Celery
broker = 'redis://127.0.0.1:6379/1'
backend = 'redis://127.0.0.1:6379/2'
app=Celery(__name__,broker=broker,backend=backend,include=['celery_task.task1','celery_task.task2'])
#celery_task/task1.py
from .celery import app
@app.task
def add(x, y):
print(x, y)
return x + y
#celery_task/task2.py
from .celery import app
@app.task
def mutile(x, y):
print(x, y)
return x * y
# script/celery_cccc.py
from celery_task.task1 import add
from celery_task.task2 import mutile
ret = add.delay(6, 7)
print(ret)
执行定时任务和延迟任务
# script/celery_cccc.py
from celery_task.task1 import add
from celery_task.task2 import mutile
ret = add.delay(6, 7)
print(ret)
# 延迟任务
from datetime import datetime,timedelta
eta = datetime.utcnow()+timedelta(seconds=10)
add.apply_async(args=(200,50),eta=eta)
#定时任务
celery worker -A celery_task -l info -P eventlet
先执行这个命令
celery beat -A celery_task -l info
在执行在这个!