> backend.py
> """
> import uwsgi
>
> def application(env, start_response):
> uwsgi.websocket_handshake(env['HTTP_SEC_WEBSOCKET_KEY'],
> env.get('HTTP_ORIGIN', ''))
> websocket_fd = uwsgi.connection_fd()
> while True:
> print 'while...'
> uwsgi.wait_fd_read(websocket_fd, 3)
>
> #uwsgi.suspend()
> #print 'ready...'
> #fd = uwsgi.ready_fd()
>
> msg = uwsgi.websocket_recv_nb()
> print msg
> uwsgi.websocket_send('ok')
> """
>
>
>
> $ uwsgi --http-socket :8000 -w backend --need-app --py-autoreload 1
> --async
> 10
> *** Starting uWSGI 1.9.20 (32bit) on [Sun Dec 1 13:22:02 2013] ***
> compiled with version: 4.8.2 20131017 (Red Hat 4.8.2-1) on 01 December
> 2013
> 12:41:11
> os: Linux-3.11.8-200.fc19.i686 #1 SMP Wed Nov 13 16:55:29 UTC 2013
> nodename: ddlap
> machine: i686
> clock source: unix
> pcre jit disabled
> detected number of CPU cores: 4
> current working directory: /home/ddarko/projects/websocket
> detected binary path: /usr/bin/uwsgi
> your processes number limit is 1024
> your memory page size is 4096 bytes
> detected max file descriptor number: 1024
> - async cores set to 10 - fd table size: 1024
> lock engine: pthread robust mutexes
> thunder lock: disabled (you can enable it with --thunder-lock)
> uwsgi socket 0 bound to TCP address :8000 fd 3
> Python version: 2.7.5 (default, Oct 8 2013, 12:19:01) [GCC 4.8.1
> 20130603
> (Red Hat 4.8.1-1)]
> Python main interpreter initialized at 0x868a228
> python threads support enabled
> your server socket listen backlog is limited to 100 connections
> your mercy for graceful operations on workers is 60 seconds
> mapped 262192 bytes (256 KB) for 10 cores
> *** Operational MODE: async ***
> WSGI app 0 (mountpoint='') ready in 0 seconds on interpreter 0x868a228
> pid:
> 12902 (default app)
> *** uWSGI is running in multiple interpreter mode ***
> spawned uWSGI master process (pid: 12902)
> spawned uWSGI worker 1 (pid: 12903, cores: 10)
> *** DANGER *** async mode without coroutine/greenthread engine loaded !!!
> Python auto-reloader enabled
>
>
>
>
> while...
>
> while...
> epoll_ctl(): File exists [core/event.c line 520]
> Traceback (most recent call last):
> File "./backend.py", line 10, in application
> uwsgi.wait_fd_read(websocket_fd, 3)
> IOError: unable to fd 6 to the event queue
> epoll_ctl(): No such file or directory [core/event.c line 635]
> [pid: 12903|app: 0|req: 1/1] 127.0.0.1 () {38 vars in 588 bytes} [Sun Dec
> 1 13:22:07 2013] GET /echo => generated 6 bytes in 32 msecs (HTTP/1.1
> 101)
> 4 headers in 167 bytes (0 switches on core 9)
>
>
>
>
> What am I doing wrong?
>
> Frontend connects correctly, sends the data, but I do not receive it at
> msg
> = uwsgi.websocket_recv_nb().
> Print returns an empty value.
>
> The loop performs another iteration and the error occurs.
>
> I would like to receive messages asynchronously from the front and reply
> "ok" after receiving it.
>
Plain async mode has been brought back only in current github code (in
preparation for 2.0). On stable releases you need to use some suspend
engine (like gevent or ugreen on cpython or continulets on pypy).
--
Roberto De Ioris
http://unbit.it
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