Currently, I am running a vagrant server on Ubuntu 14.04 and I test all my django modules by using the simple python manage.py runserver 0.0.0.0:8000
Since I am connecting to the django webserver using chrome through http://localhost:8000 and the server is running on a VM, I am port forwarding through the usage of the following setting in Vagrantfile
config.vm.network "forwarded_port", guest: 8000, host: 8000
Everything runs normally (all modules/views/tests function as expected), however, ever since I started using grequests I get this weird error
Exception happened during processing of request from ('10.0.2.2', 63520)
Traceback (most recent call last):
File "/home/vagrant/anaconda3/lib/python3.6/socketserver.py", line 639, in process_request_thread
self.finish_request(request, client_address)
File "/home/vagrant/anaconda3/lib/python3.6/socketserver.py", line 361, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/home/vagrant/anaconda3/lib/python3.6/socketserver.py", line 696, in __init__
self.handle()
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/django/core/servers/basehttp.py", line 159, in handle
self.raw_requestline = self.rfile.readline(65537)
File "/home/vagrant/anaconda3/lib/python3.6/socket.py", line 586, in readinto
return self._sock.recv_into(b)
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/gevent/_socket3.py", line 385, in recv_into
self._wait(self._read_event)
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/gevent/_socket3.py", line 157, in _wait
self.hub.wait(watcher)
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/gevent/hub.py", line 651, in wait
result = waiter.get()
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/gevent/hub.py", line 899, in get
return self.hub.switch()
File "/home/vagrant/anaconda3/lib/python3.6/site-packages/gevent/hub.py", line 630, in switch
return RawGreenlet.switch(self)
gevent.hub.LoopExit: ('This operation would block forever', <Hub at 0x7f3b777e8af8 epoll pending=0 ref=0 fileno=34>)
Note that I am not using grequests and that simply importing it seems to cause this error even when it is not being called or anything
Anyone have any ideas?
This is an issue with one of the underlying dependency - gevent, which overrides the default behaviour of python builtin such as time, etc.
You would have to monkeypatch. Something like:
from gevent import monkey
monkey.patch_all()
Here is the relevant gevent documentation.
I recently ran into this exact issue - so stopped using grequests and implemented my own async requests logic