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

[Doug Blank]

On Wed, Feb 4, 2015 at 12:00 PM, MinRK <benjaminrk at gmail.com> wrote:

> 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.
>
Ok, thanks... that gives me some things to try. Perhaps if I just change
the way that the sockets read/write it may work?

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.
>
Hmmm... but I am getting a 5 to 8 byte identity string on the
kernel_info_request... what does that imply? It is a ZMQ identity? It could
be ignored? Or, I must respect it, and send it back (in proper form) with
the response?

-Doug



> -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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