topic reply/response in PersistentServerConnectionApplication in Splunk Dev

reply/response in PersistentServerConnectionApplication

Schroeder — Mon, 30 Jun 2025 15:47:41 GMT

Hi,

how can I reply to the sending endpoint not using return as I want to keep the connection open?

My endpoint works as long as I respond via the return through the appserver but I do not want to close the connection. I tried using yield with json.dumps but then the appserver throws a serialization error.

Doing this async it also something the appserver does not like.

How can I do something like:

response {'a':'1'}

... do something

return {'a':'2'}

Sample, this works:

return {'payload': '','status': 200}

and this does not:

yield jsons.dumps({'payload': '','status': 200})

Thanks Peter

Re: reply/response in PersistentServerConnectionApplication

livehybrid — Mon, 30 Jun 2025 16:18:36 GMT

Hi @Schroeder

In your restmap.conf have you set stream=true? I'm not sure if this is the only thing you would need to change but it could be a good starting point!

https://help.splunk.com/en/splunk-enterprise/administer/admin-manual/9.4/configuration-file-reference/9.4.3-configuration-file-reference/restmap.conf#:~:text=persist%22.%0A*%20Default%3A%20false-,stream%20%3D%20%3Cboolean%3E,-*%20Describes%20whether%20or

stream = <boolean> * Describes whether or not splunkd sends the payload in the request to the driver in a streaming fashion. * A value of "true" means splunkd sends the payload in the request to the driver in a stream, or multiple sequential requests. * A value of "false" means splunkd sends the payload in the request to the driver as a field of the original request. * Only has effect if the 'scripttype' setting is set to "persist". * Default: false

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Re: reply/response in PersistentServerConnectionApplication

Schroeder — Mon, 30 Jun 2025 17:52:39 GMT

Hi!

No, I did not. Does that mean I could then use yield?

I have a hard way to find good examples for me use case.

//Peter

Re: reply/response in PersistentServerConnectionApplication

livehybrid — Tue, 01 Jul 2025 06:09:42 GMT

Hi @Schroeder

I've been trying to get this to work but unfortunately not managed to. It looks like this is designed for streamed payload being sent into the persistconn/appserver.py rather than as a response to the browser.

Please let us know if you do manage to get anywhere with this though - Perhaps its possible with a custom driver = value, although there arent many examples of this online!

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