[IPython-dev] Notebook doesn't respond to external kernel's kernel_info_request properly

[MinRK]

On Wed, Feb 4, 2015 at 3:23 AM, Doug Blank <doug.blank at gmail.com> wrote:

On Tue, Feb 3, 2015 at 11:58 PM, MinRK <benjaminrk at gmail.com> wrote:
>
>> I've looked through the code and I don't see any of the likely culprits.
>> It is definitely the identities that determine the destination of a
>> message, so that's where I would start to debug. I don't have a C# dev
>> environment, so I can't dig much deeper myself.
>>
>
> Thanks for looking at this. Where in the IPython code do identities get
> decoded and then routed? Maybe I can see there what the notebook is
> actually receiving from the kernel and what it actually should be.
>
They don’t get decoded at all, but they are gathered from the message
content in Session.feed_identities
<https://github.com/ipython/ipython/blob/master/IPython/kernel/zmq/session.py#L732>,
and then used unmodified to route the reply.

I think I might know what’s going on, though. I see UTF8 used on every
send/recv, but identities are not UTF8, they are binary blobs (uint32 by
default). So if it’s coercing those to UTF8, the value of the identity will
be lost in encoding errors.

This could be why it works in some places and not others - we set a manual
identity on *most* sockets, which we use to associate the stdin channel
with a given request. These happen to be ASCII, but could jut as easily be
random binary values. We don’t set an identity on the socket used for the
kernel_info_request that starts off the notebook connection, though.

-MinRK


> -Doug
>
>
>
>>
>> -MinRK
>>
>> On Tue, Feb 3, 2015 at 8:55 AM, Doug Blank <doug.blank at gmail.com> wrote:
>>
>>> IPython devs,
>>>
>>> Having a problem trying to get an external C# kernel to work with the
>>> notebook. Everything appears to work fine, except for the
>>> kernel_info_request. "kernel_info_request" seems to work fine with the
>>> console, but not from the notebook.
>>>
>>> Can you think of a reason that the kernel_info_reply wouldn't get back
>>> to the right receiver in the notebook? Could it be the identities? Do they
>>> play a role in this?
>>>
>>> The code is here:
>>>
>>> https://github.com/dsblank/simple_kernel/blob/master/SimpleKernel.cs
>>>
>>> Any ideas appreciated... I've tried to follow why it wouldn't get routed
>>> back to the handler, but haven't found the problem yet.
>>>
>>> -Doug
>>>
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>>>
>>
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