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 process as simple as:
$ pip install aiohttp-sseaio-libs google group: https://groups.google.com/forum/#!forum/aio-libs
import asyncio
from aiohttp import web
from aiohttp_sse import sse_response
async def hello(request):
loop = asyncio.get_event_loop()
resp = await sse_response(request)
for i in range(0, 100):
print('foo')
await asyncio.sleep(1, loop=loop)
resp.send('foo {}'.format(i))
resp.stop_streaming()
return resp
async def index(request):
d = b"""
<html>
<head>
<script type="text/javascript"
src="http://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript">
var evtSource = new EventSource("/hello");
evtSource.onmessage = function(e) {
$('#response').html(e.data);
}
</script>
</head>
<body>
<h1>Response from server:</h1>
<div id="response"></div>
</body>
</html>
"""
return Response(body=d)
loop = asyncio.get_event_loop()
app = web.Application(loop=loop)
app.router.add_route('GET', '/hello', hello)
app.router.add_route('GET', '/index', index)
web.run_app(app, host='127.0.0.1', port=8080)Same example with asynchronous context manager interface (python3.5+)
import asyncio
from aiohttp.web import Application, Response
from aiohttp_sse import sse_response
async def hello(request):
resp = await sse_response(request)
async with resp:
for i in range(0, 100):
print('foo')
await asyncio.sleep(1, loop=loop)
resp.send('foo {}'.format(i))
return resp
async def index(request):
d = b"""
<html>
<head>
<script type="text/javascript"
src="http://code.jquery.com/jquery.min.js"></script>
<script type="text/javascript">
var evtSource = new EventSource("/hello");
evtSource.onmessage = function(e) {
$('#response').html(e.data);
}
</script>
</head>
<body>
<h1>Response from server:</h1>
<div id="response"></div>
</body>
</html>
"""
return Response(body=d)
loop = asyncio.get_event_loop()
app = web.Application(loop=loop)
app.router.add_route('GET', '/hello', hello)
app.router.add_route('GET', '/index', index)
web.run_app(app, host='127.0.0.1', port=8080)- http://www.w3.org/TR/2011/WD-eventsource-20110310/
- https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events
The aiohttp-sse is offered under Apache 2.0 license.