Subject: Writing Igor experiment from Python?
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Message-ID: <373879b1-4da5-97be-74da-48ad0a63f640@virtuell-zuhause.de>

Am 03.09.2018 um 23:17 schrieb Scott Hannahs:
> I was not going to dive into the C++ but use the already existing Sockit XOP.
> https://www.wavemetrics.com/project/SOCKIT
>
> But ZeroMQ could also work as a messaging platform. I was also looking for data to go the other way and to push collected data into Igor as a binary transfer. That was why I was thinking of a two channel system of one for command and one for data streams.

You can also just skip the bells & whistles of the ZeroMQ XOP and just
push data around.

Using two Igor Pro instances

Side A (Dealer):

The string msg is pushed, we wait for a reply and then finish.

Function ClientLoop()

zeromq_stop()
// zeromq_set(ZeroMQ_SET_FLAGS_DEBUG)
zeromq_client_connect("tcp://127.0.0.1:5555")

string msg = "someData"

for(;;)
zeromq_client_send(msg)
string reply = zeromq_client_recv()

if(numtype(strlen(reply)) != 0 || strlen(reply) == 0)
break
endif

printf "Received reply: \"%s\"\r", reply
break
endfor
End

Side B (Router):

We wait for incoming messages and acknowledge them.

Function ServerLoop()

string reply, identity

zeromq_stop()
// zeromq_set(ZeroMQ_SET_FLAGS_DEBUG)
zeromq_server_bind("tcp://127.0.0.1:5555")

for(;;)
string msg = zeromq_server_recv(identity)

if(numtype(strlen(msg)) != 0 || strlen(msg) == 0)
break
endif

printf "got data: %s\r", msg
printf "identity: %s\r", identity

reply = "Got it!"

printf "Sending reply: %s\r", reply
zeromq_server_send(identity, reply)
endfor
End

You are limited to pushing at most 2GB at a time as this (IIRC) is the
maximum string length in IP. By default all recv functions wait
indefinitly for a message, this can be changed with
zeromq_set(ZeroMQ_SET_FLAGS_NOBUSYWAITRECV). The implemented ZeroMQ
pattern is explained here https://rfc.zeromq.org/spec:28/REQREP/.

On the github page are XOPs for Windows and Mac available.

Hope that helps,
Thomas

>> On Sep 3, 2018, at 2:47 PM, Thomas Braun <thomas.braun at virtuell-zuhause.de> wrote:
>>
>> Am 03.09.2018 um 18:34 schrieb Scott Hannahs:
>>> The other method that I haven?t coded up, but keep thinking about is to use the TCP/IP xop to run in a background task. It listens for command strings and executes them. To transfer data, that special command would open an additional TCP channel and just dump data of a given type and length into a wave.
>>>
>>> This then means that the Igor plot/analysis server can exist on any machine and not just the local system.
>>
>>
>> I don't want to take away the fun of doing some C++ coding and having
>> fun with the OS TCP/IP stack, but I might have something usable already.
>>
>> We are using an Igor Pro application and a python application together.
>> And the python application can execute Igor Pro user functions via [1]
>> and return their results. It uses ZeroMQ as messaging layer and can be
>> used either locally or over the network.
>>
>> The following parameter/return types for Igor Pro functions are
>> currently supported:
>>
>> ###
>> Supported parameter types:
>>
>> string (including pass-by-reference)
>> variable (including pass-by-reference)
>> datafolder reference
>>
>> Supported return types:
>>
>> string
>> variable
>> wave (without wave reference waves or datafolder reference waves)
>> datafolder reference
>> ###
>>
>> This is used like everyday and a lot and works pretty well.
>>
>> Thomas
>>
>> [1]: https://github.com/AllenInstitute/ZeroMQ-XOP/
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