session超时怎么解决_session超时怎么解决

session超时怎么解决_session超时怎么解决前言ClientTimeout是设置整个会话的超时时间,默认情况下是300秒(5分钟)超时

前言

ClientTimeout 是设置整个会话的超时时间,默认情况下是300秒(5分钟)超时。

ClientTimeout

默认情况下,aiohttp使用总共300 秒(5 分钟)超时,这意味着整个操作应该在 5 分钟内完成。

timeout = aiohttp.ClientTimeout(total=60)
async with aiohttp.ClientSession(timeout=timeout) as session:
    ...

对于如下对session会话发单个请求,超时可能会被覆盖ClientSession.get():

async with session.get(url, timeout=timeout) as resp:
    ...

ClientTimeout 可以支持的字段

  • total 整个操作的最大秒数,包括建立连接、发送请求和读取响应。
  • connect 如果超出池连接限制,则建立新连接或等待池中的空闲连接的最大秒数。
  • sock_connect 为新连接连接到对等点的最大秒数,不是从池中给出的。
  • sock_read 从对等点读取新数据部分之间允许的最大秒数。

默认超时为:

aiohttp.ClientTimeout(total=5*60, connect=None,
                      sock_connect=None, sock_read=None)

session超时怎么解决_session超时怎么解决

实例

timeout参数是对整个aiohttp.ClientSession 会话的超时时间,比如我创建一个会话,里面有10个请求。
设置超时时间为3秒,那么从创建会话开始,在3秒内完成所有的请求就不会报错,当大于3秒还没完成10个请求就会抛异常

import aiohttp
import asyncio
from pathlib import Path


async def down_img(session, url):
    """下载图片"""
    name = url.split('/')[-1]  # 获得图片名字
    img = await session.get(url)
    # 触发到await就切换,等待get到数据
    content = await img.read()
    # 读取内容
    with open('./down_img/'+str(name), 'wb') as f:
        # 写入至文件
        f.write(content)
        print(f'{name} 下载完成!')

    return str(url)


async def main(URL):
    # 建立会话session
    timeout = aiohttp.ClientTimeout(total=3)
    conn = aiohttp.TCPConnector(ssl=False)  # 防止ssl报错
    async with aiohttp.ClientSession(timeout=timeout, connector=conn) as session:
        # 建立所有任务
        tasks = [asyncio.create_task(down_img(session, img_url)) for img_url in URL]
        # 触发await,等待任务完成
        done, pending = await asyncio.wait(tasks)
        # all_results = [done_task.result() for done_task in done]
        # # 获取所有结果
        # print("ALL RESULT:"+str(all_results))


URL = [
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
    'https://cdn.pixabay.com/photo/2018/03/12/20/07/maldives-3220702_960_720.jpg',
    'https://cdn.pixabay.com/photo/2017/08/04/17/56/dolomites-2580866_960_720.jpg',
    'https://cdn.pixabay.com/photo/2016/06/20/03/15/pier-1467984_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/07/30/02/00/iceberg-404966_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/11/02/10/41/plane-513641_960_720.jpg',
    'https://cdn.pixabay.com/photo/2015/10/30/20/13/sea-1014710_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
]

fp = Path('./down_img')
if not fp.exists():
    fp.mkdir()


loop = asyncio.get_event_loop()
loop.run_until_complete(main(URL))

由于3秒内没完成所有的请求,运行结果会抛出异常:asyncio.TimeoutError

sea-1014710_960_720.jpg 下载完成!
railroad-163518_960_720.jpg 下载完成!
plane-513641_960_720.jpg 下载完成!
iceberg-404966_960_720.jpg 下载完成!
Task exception was never retrieved
future: <Task finished name='Task-2' coro=<down_img() done, defined at D:/demo/demo/new/xuexi/d1.py:6> exception=TimeoutError()>
Traceback (most recent call last):
File "D:/demo/demo/new/xuexi/d1.py", line 12, in down_img
    content = await img.read()
...
    raise asyncio.TimeoutError from None
asyncio.exceptions.TimeoutError

给单个请求添加timeout

如果我们的需求是每个请求设置超时,单个请求大于3秒就超时,把timeout参数放到get请求上

    timeout = aiohttp.ClientTimeout(total=3)
    img = await session.get(url, timeout=timeout)

完整的代码

import aiohttp
import asyncio
from pathlib import Path


async def down_img(session, url):
    """下载图片"""
    name = url.split('/')[-1]  # 获得图片名字
    timeout = aiohttp.ClientTimeout(total=3)
    img = await session.get(url, timeout=timeout)
    # 触发到await就切换,等待get到数据
    content = await img.read()
    # 读取内容
    with open('./down_img/'+str(name), 'wb') as f:
        # 写入至文件
        f.write(content)
        print(f'{name} 下载完成!')

    return str(url)


async def main(URL):
    # 建立会话session
    conn = aiohttp.TCPConnector(ssl=False)  # 防止ssl报错
    async with aiohttp.ClientSession(connector=conn) as session:
        # 建立所有任务
        tasks = [asyncio.create_task(down_img(session, img_url)) for img_url in URL]
        # 触发await,等待任务完成
        done, pending = await asyncio.wait(tasks)
        # all_results = [done_task.result() for done_task in done]
        # # 获取所有结果
        # print("ALL RESULT:"+str(all_results))


URL = [
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
    'https://cdn.pixabay.com/photo/2018/03/12/20/07/maldives-3220702_960_720.jpg',
    'https://cdn.pixabay.com/photo/2017/08/04/17/56/dolomites-2580866_960_720.jpg',
    'https://cdn.pixabay.com/photo/2016/06/20/03/15/pier-1467984_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/07/30/02/00/iceberg-404966_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/11/02/10/41/plane-513641_960_720.jpg',
    'https://cdn.pixabay.com/photo/2015/10/30/20/13/sea-1014710_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
]

fp = Path('./down_img')
if not fp.exists():
    fp.mkdir()


loop = asyncio.get_event_loop()
loop.run_until_complete(main(URL))

这样写其实并不会达到我们的预期,官方文档上说对于如下请求,超时可能会被覆盖ClientSession.get()

session超时怎么解决_session超时怎么解决

那你timeout不管放在ClientSession() 还是单个get/post请求里,其实效果都一样,都是针对整个会话超时。

捕获超时异常 asyncio.TimeoutError

触发的超时异常是 asyncio.TimeoutError,从Traceback可以看到是content = await img.read() 这里报错

import aiohttp
import asyncio
from pathlib import Path


async def down_img(session, url):
    """下载图片"""
    name = url.split('/')[-1]  # 获得图片名字
    try:
        img = await session.get(url)
        # 触发到await就切换,等待get到数据
        content = await img.read()
        # 读取内容
        with open('./down_img/'+str(name), 'wb') as f:
            # 写入至文件
            f.write(content)
            print(f'{name} 下载完成!')
            return str(url)
    except asyncio.TimeoutError as msg:
        print('timeout: '+str(url))
        return str(url)



async def main(URL):
    # 建立会话session
    timeout = aiohttp.ClientTimeout(total=3)
    conn = aiohttp.TCPConnector(ssl=False)  # 防止ssl报错
    async with aiohttp.ClientSession(timeout=timeout, connector=conn) as session:
        # 建立所有任务
        tasks = [asyncio.create_task(down_img(session, img_url)) for img_url in URL]
        # 触发await,等待任务完成
        done, pending = await asyncio.wait(tasks)
        # all_results = [done_task.result() for done_task in done]
        # # 获取所有结果
        # print("ALL RESULT:"+str(all_results))


URL = [
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
    'https://cdn.pixabay.com/photo/2018/03/12/20/07/maldives-3220702_960_720.jpg',
    'https://cdn.pixabay.com/photo/2017/08/04/17/56/dolomites-2580866_960_720.jpg',
    'https://cdn.pixabay.com/photo/2016/06/20/03/15/pier-1467984_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/07/30/02/00/iceberg-404966_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/11/02/10/41/plane-513641_960_720.jpg',
    'https://cdn.pixabay.com/photo/2015/10/30/20/13/sea-1014710_960_720.jpg',
    'https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg',
    'https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg',
]

fp = Path('./down_img')
if not fp.exists():
    fp.mkdir()


loop = asyncio.get_event_loop()
loop.run_until_complete(main(URL))

运行结果:

plane-513641_960_720.jpg 下载完成!
maldives-3220702_960_720.jpg 下载完成!
sea-1014710_960_720.jpg 下载完成!
dolomites-2580866_960_720.jpg 下载完成!
iceberg-404966_960_720.jpg 下载完成!
mountain-477832_960_720.jpg 下载完成!
timeout: https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg
timeout: https://cdn.pixabay.com/photo/2016/06/20/03/15/pier-1467984_960_720.jpg
timeout: https://cdn.pixabay.com/photo/2013/07/18/10/56/railroad-163518_960_720.jpg
timeout: https://cdn.pixabay.com/photo/2014/10/07/13/48/mountain-477832_960_720.jpg

今天的文章session超时怎么解决_session超时怎么解决分享到此就结束了,感谢您的阅读。

版权声明:本文内容由互联网用户自发贡献,该文观点仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 举报,一经查实,本站将立刻删除。
如需转载请保留出处:https://bianchenghao.cn/87963.html

(0)
编程小号编程小号

相关推荐

发表回复

您的电子邮箱地址不会被公开。 必填项已用 * 标注