aiohttp-sse
The EventSource interface is used to receive server-sent events. It connects to a server over HTTP and receives events in text/event-stream format without closing the connection. aiohttp-sse provides support for server-sent events for aiohttp.
Installation
Installation process as simple as:
$ pip install aiohttp-sse
Example
import asyncio
from aiohttp import web
from aiohttp.web import Response
from aiohttp_sse import sse_response
from datetime import datetime
async def hello(request):
async with sse_response(request) as resp:
while True:
data = 'Server Time : {}'.format(datetime.now())
print(data)
await resp.send(data)
await asyncio.sleep(1)
async def index(request):
d = """
<html>
<body>
<script>
var evtSource = new EventSource("/hello");
evtSource.onmessage = function(e) {
document.getElementById('response').innerText = e.data
}
</script>
<h1>Response from server:</h1>
<div id="response"></div>
</body>
</html>
"""
return Response(text=d, content_type='text/html')
app = web.Application()
app.router.add_route('GET', '/hello', hello)
app.router.add_route('GET', '/', index)
web.run_app(app, host='127.0.0.1', port=8080)EventSource Protocol
- http://www.w3.org/TR/2011/WD-eventsource-20110310/
- https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events
Requirements
License
The aiohttp-sse is offered under Apache 2.0 license.