[IPython-dev] Message spec draft more fleshed out

[Brian Granger]

Min,

On Wed, Aug 11, 2010 at 12:14 PM, MinRK <benjaminrk at gmail.com> wrote:

> A note on the heartbeat section.
>
> I don't know if you guys are using the heartbeat messages, but my heartbeat
> monitor doesn't  use Python messages at all. It's pure ZMQ, so it never
> enters Python code, and packing up of reply messages isn't available. The
> monitor sends out a single zmq message (right now, it is a str of the
> monitor's lifetime in seconds), and gets the same message right back,
> prefixed with the zmq identity of the XREQ socket in the heartbeat process.
> This can be a uuid, or even a full message, but I don't see a need for
> packing up a message when the sender and receiver are the exact same Python
> object.
>
>
Very good points.  I think we should just copy this description into the
message spec.


> The model is this:
> monitor.send(str(self.lifetime)) # '1.2345678910'
> and the monitor receives some number of messages of the form:
> ['uuid-abcd-dead-beef', '1.2345678910']
> where the first part is the zmq.IDENTITY of the heart's XREQ on the engine,
> and the rest is the message sent by the monitor.  No Python code ever has
> any access to the message between the monitor's send, and the monitor's
> recv.
>
>
Cheers,

Brian



> -MinRK
>
> On Wed, Aug 11, 2010 at 00:39, Fernando Perez <fperez.net at gmail.com>wrote:
>
>> Howdy,
>>
>> On Tue, Aug 10, 2010 at 1:02 AM, Fernando Perez <fperez.net at gmail.com>
>> wrote:
>> > Hi folks,
>> >
>> > here:
>> >
>> >
>> http://github.com/ipython/ipython/blob/106bc2e0587d315db67988c1803b8574fc54463a/docs/source/development/messaging.txt
>> >
>> > is a more fleshed out message spec document for feedback.  I'd
>> > especially like to hear from Omar and Gerardo if you notice any
>> > important point missing, since you've been thinking a fair bit about
>> > this.
>>
>> Thanks a lot for the feedback so far.  It took a lot more work than
>> I'd thought, but I think we now have a fairly solid first pass at a
>> *complete* design and messaging spec (excluding the parallel computing
>> part).  Here's the last version I just put up:
>>
>>
>> http://github.com/ipython/ipython/blob/8dbbf5e225c816fe2b74c5756ab0b3a558cd9303/docs/source/development/messaging.txt
>>
>> but if you prefer to read civilized HTML I built and pushed the nightlies:
>>
>> http://ipython.scipy.org/doc/nightly/html/development/messaging.html
>>
>>
>> At this point, please do pound on this document.  This should be our
>> *real* spec,  the actual code should match it, and it should be
>> complete.  We'll be implementing off of this, so anything that I've
>> missed, please do point it out.
>>
>> Thanks for any feedback!
>>
>> f
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>
>
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-- 
Brian E. Granger, Ph.D.
Assistant Professor of Physics
Cal Poly State University, San Luis Obispo
bgranger at calpoly.edu
ellisonbg at gmail.com
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