aiohttp

aiohttp

---

1. aiohttp

基于asyncio实现的异步HTTP client/server。
但做为一个server，aiohttp太底层了一点，一般多使用它的client端。

文档：https://docs.aiohttp.org/en/stable/

1.1. 安装

pip install aiohttp

2. 使用

2.1. 简单使用

下面是基于aiohttp的server/client。

Client example:

  
import aiohttp  
import asyncio  

async def fetch(session, url):  
    async with session.get(url) as response:  
        return await response.text()  

async def main():  
    async with aiohttp.ClientSession() as session:  
        html = await fetch(session, 'http://python.org')  
        print(html)  

if __name__ == '__main__':  
    loop = asyncio.get_event_loop()  
    loop.run_until_complete(main())  

Server example:

  
from aiohttp import web  

async def handle(request):  
    name = request.match_info.get('name', "Anonymous")  
    text = "Hello, " + name  
    return web.Response(text=text)  

app = web.Application()  
app.add_routes([web.get('/', handle),  
                web.get('/{name}', handle)])  

if __name__ == '__main__':  
    web.run_app(app)  

3. client

  

import aiohttp  

async with aiohttp.ClientSession() as session:  
    async with session.get('http://httpbin.org/get') as resp:  
        print(resp.status)  
        print(await resp.text())  

# 其它请求  
session.post('http://httpbin.org/post', data=b'data')  
session.put('http://httpbin.org/put', data=b'data')  
session.delete('http://httpbin.org/delete')  
session.head('http://httpbin.org/get')  
session.options('http://httpbin.org/get')  
session.patch('http://httpbin.org/patch', data=b'data')  


# 传参  
params = {'key1': 'value1', 'key2': 'value2'}  
async with session.get('http://httpbin.org/get',  
                       params=params) as resp:  
    expect = 'http://httpbin.org/get?key2=value2&key1=value1'  
    assert str(resp.url) == expect  


# response  
async with session.get('https://api.github.com/events') as resp:  
    print(resp.status)  
    print(await resp.text())  

# 输出  
# 200  
# '[{"created_at":"2015-06-12T14:06:22Z","public":true,"actor":{...  

await resp.text(encoding='windows-1251')  

# 二进制数据  
print(await resp.read())  



# JSON Request  
async with aiohttp.ClientSession() as session:  
    async with session.post(url, json={'test': 'object'})  

# JSON response  
async with session.get('https://api.github.com/events') as resp:  
    print(await resp.json())  



# 流数据  

async with session.get('https://api.github.com/events') as resp:  
    await resp.content.read(10)  

# 更进一步使用  
with open(filename, 'wb') as fd:  
    while True:  
        chunk = await resp.content.read(chunk_size)  
        if not chunk:  
            break  
        fd.write(chunk)  


# 请求超时 Timeouts  
timeout = aiohttp.ClientTimeout(total=60)  
async with aiohttp.ClientSession(timeout=timeout) as session:  
    ...  


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