Connection becomes invalid when getting and unexisting variable #91
Description
I start a new pymatbridge server and don't define the variable 'x' in Matlab. Now I execute:
In [6]: mlab.get_variable('x')
??? Error using ==> evalin
Undefined function or variable 'x'.
Error in ==> pymat_get_variable at 27
response.var = evalin('base', varname);
Error in ==> matlabserver at 34
resp = feval(fhandle, req);
>>
It gets stuck, and if I press ^C I get the traceback:
KeyboardInterrupt Traceback (most recent call last)
<ipython-input-6-5e01d5fc1178> in <module>()
----> 1 mlab.get_variable('x')
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/pymatbridge/pymatbridge.pyc in get_variable(self, varname, maxtime)
225 req = json.dumps(req, cls=ComplexEncoder)
226 self.socket.send(req)
--> 227 resp = self.socket.recv_string()
228 resp = json.loads(resp, object_hook=as_complex)
229
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/sugar/socket.pyc in recv_string(self, flags, encoding)
342 The Python unicode string that arrives as encoded bytes.
343 """
--> 344 b = self.recv(flags=flags)
345 return b.decode(encoding)
346
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket.Socket.recv (zmq/backend/cython/socket.c:5787)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket.Socket.recv (zmq/backend/cython/socket.c:5587)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket._recv_copy (zmq/backend/cython/socket.c:1720)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:6037)()
Now the connection doesn't work anymore:
In [7]: mlab.get_variable('a')
---------------------------------------------------------------------------
ZMQError Traceback (most recent call last)
<ipython-input-26-a3a6f8279f49> in <module>()
----> 1 mlab.get_variable('a')
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/pymatbridge/pymatbridge.pyc in get_variable(self, varname, maxtime)
224 req['varname'] = varname
225 req = json.dumps(req, cls=ComplexEncoder)
--> 226 self.socket.send(req)
227 resp = self.socket.recv_string()
228 resp = json.loads(resp, object_hook=as_complex)
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket.Socket.send (zmq/backend/cython/socket.c:5449)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket.Socket.send (zmq/backend/cython/socket.c:5209)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.socket._send_copy (zmq/backend/cython/socket.c:2030)()
/home/dukebody/.virtualenvs/pymatbridge/lib/python2.7/site-packages/zmq/backend/cython/socket.so in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:6263)()
ZMQError: Operation cannot be accomplished in current state
This is certainly not ideal. I assume that the connection gets blocked waiting for a kind of response that never arrives.