http client/server for asyncio
Features
- Supports both client and server side of HTTP protocol.
- Supports both client and server Web-Sockets out-of-the-box.
- Web-server has middlewares and pluggable routing.
Getting started
Client
To retrieve something from the web:
import aiohttp
import asyncio
async def fetch(session, url):
with aiohttp.Timeout(10, loop=session.loop):
async with session.get(url) as response:
return await response.text()
async def main(loop):
async with aiohttp.ClientSession(loop=loop) as session:
html = await fetch(session, 'http://python.org')
print(html)
if __name__ == '__main__':
loop = asyncio.get_event_loop()
loop.run_until_complete(main(loop))Server
This is simple usage example:
from aiohttp import web
async def handle(request):
name = request.match_info.get('name', "Anonymous")
text = "Hello, " + name
return web.Response(text=text)
async def wshandler(request):
ws = web.WebSocketResponse()
await ws.prepare(request)
async for msg in ws:
if msg.type == web.MsgType.text:
ws.send_str("Hello, {}".format(msg.data))
elif msg.type == web.MsgType.binary:
ws.send_bytes(msg.data)
elif msg.type == web.MsgType.close:
break
return ws
app = web.Application()
app.router.add_get('/echo', wshandler)
app.router.add_get('/', handle)
app.router.add_get('/{name}', handle)
web.run_app(app)Note: examples are written for Python 3.5+ and utilize PEP-492 aka
async/await. If you are using Python 3.4 please replace await with
yield from and async def with @coroutine e.g.:
async def coro(...):
ret = await f()
should be replaced by:
@asyncio.coroutine
def coro(...):
ret = yield from f()
Documentation
https://aiohttp.readthedocs.io/
Discussion list
aio-libs google group: https://groups.google.com/forum/#!forum/aio-libs
Requirements
- Python >= 3.4.2
- async-timeout
- chardet
- multidict
- yarl
Optionally you may install the cChardet and aiodns libraries (highly recommended for sake of speed).
License
aiohttp is offered under the Apache 2 license.
Source code
The latest developer version is available in a github repository: https://github.com/KeepSafe/aiohttp
Benchmarks
If you are interested in by efficiency, AsyncIO community maintains a list of benchmarks on the official wiki: https://github.com/python/asyncio/wiki/Benchmarks