This operation would block forever

[arafiq]

I keep getting this error, every other time I refresh this page. I am fairly new to gevent to figure out what is going on. The code that I am implementing is very similar to the one posted in the example. I am using the latest version of django-websockets-redis ( v0.2.1 installed via pypi). I am happy post my code if needed. I am currently testing this in development. (python manage.py runserver)

 [03/Jan/2014 08:54:58] "GET /ws/foobar?subscribe-session&subscribe-user&publish-user&subscribe-broadcast HTTP/1.1" 101 0
 Other Exception:
 Traceback (most recent call last):
 File "build/bdist.linux-x86_64/egg/ws4redis/wsgi_server.py", line 73, in __call__
    redis_store.send_persited_messages(websocket)
 File "build/bdist.linux-x86_64/egg/ws4redis/store.py", line 63, in send_persited_messages
    message = self._connection.get(channel)
 File "/env/local/lib/python2.7/site-packages/redis/client.py", line 705, in get
    return self.execute_command('GET', name)
 File "/env/local/lib/python2.7/site-packages/redis/client.py", line 461, in execute_command
    return self.parse_response(connection, command_name, **options)
 File "/env/local/lib/python2.7/site-packages/redis/client.py", line 471, in parse_response
    response = connection.read_response()
 File "/env/local/lib/python2.7/site-packages/redis/connection.py", line 334, in read_response
    response = self._parser.read_response()
 File "/env/local/lib/python2.7/site-packages/redis/connection.py", line 188, in read_response
    buffer = self._sock.recv(4096)
 File "/env/local/lib/python2.7/site-packages/gevent/socket.py", line 392, in recv
    self._wait(self._read_event)
 File "/env/local/lib/python2.7/site-packages/gevent/socket.py", line 298, in _wait
    self.hub.wait(watcher)
 File "/env/local/lib/python2.7/site-packages/gevent/hub.py", line 341, in wait
    result = waiter.get()
 File "/env/local/lib/python2.7/site-packages/gevent/hub.py", line 568, in get
    return self.hub.switch()
 File "/env/local/lib/python2.7/site-packages/gevent/hub.py", line 331, in switch
    return greenlet.switch(self)
 LoopExit: This operation would block forever

[arafiq]

I tried an example where the incoming request is of type WSGI ( no websockets), and its still fails alternatively. With the same error.

[jrief]

Is your project available on Github or alternatives?
How can you route it into the websocket handler then - that's weird!

[arafiq]

No its not available, unfortunately. Its a project that I've been working
on at my workplace for a year now. I can create a sample project and see if
I get the same error. If I do I'll post that project on github.

On Fri, Jan 3, 2014 at 11:06 AM, Jacob Rief notifications@github.comwrote:

Is your project available on Github or alternatives?
How can you route it into the websocket handler then - that's weird!

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/3#issuecomment-31536502
.

[jrief]

Apparently you are using websockets for Redis in debug mode, ie. you run it as ./manage runserver instead of uwsgi. Is this correct?

For me it seems, as if line 5 in wsgi_server.py does not work well in debug mode. Try to deactivate this line (only for debug) until I found a fix for it.

[arafiq]

Thank you for the feedback. And yes I have been using it in debug mode
On Jan 3, 2014 3:49 PM, "Jacob Rief" notifications@github.com wrote:

Apparently you are using websockets for Redis in debug mode, ie. you run
it as ./manage runserver instead of uwsgi. Is this correct?

For me it seems, as if line 5 in wsgi_server.py does not work well in
debug mode. Try to deactivate this line (only for debug) until I found a
fix for it.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/3#issuecomment-31556528
.

[arafiq]

I tried what you suggested. Its still giving me the same error.

[jrief]

Somehow I was able to repeat your problem. I therefore moved the monkey patching of redis from the main server to the uwsgi server. I assume/hope that this will fix your problem. Please wait for version 0.2.2 and then try again.

[arafiq]

Thank you. I appreciate it. I will keep you posted after the next release,
regardless if there is a problem or not.
On Jan 4, 2014 3:57 PM, "Jacob Rief" notifications@github.com wrote:

Somehow I was able to repeat your problem. I therefore moved the monkey
patching of redis from the main server to the uwsgi server. I assume/hope
that this will fix your problem. Please wait for version 0.2.2 and then try
again.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/3#issuecomment-31589741
.

[jrief]

0.2.2 is available on PyPI.

[arafiq]

Perfect!! This new release seemed to solve the problem.