RE: Call a rpg program from a node script running on an external windows or linux server

Is the call coming in over the Internet or over a private network or VPN co=
nnection ?

First and foremost that's a consideration for potential exposures. =


Also how much volume ? (CPU exposure and rate limiting needed to be conside=
red)

Since you're using node you can:
-Write your own REST service with: =

Node (Can use the node toolkit which uses XMLSERVICE)
RPG (ILEAstic or CGI)
Python
Java

-Use IWS to expose RPG calls as REST

If on an internal/secure network you could use:
-Mapepire, but your interactions would be using Web Sockets, plus it's stil=
l pretty new.  (limited to CL commands and SQL I believe)
-Connect to XMLSERVICE over http, odbc or SSH
-Connect directly via ODBC. =


If external:
-Are you able to llimit the IP addresses hitting the app ?
-Do you have an external firewall with rate limiting ? (Cloudflare or somet=
hing similar)

For you if Node is your thing, creating the service in Node may be the best=
 option.

If each call is truly a few milliseconds, you can probably make the call an=
d just wait for the response sending back the PF outfile results.

Hope this helps.

Regards,
Richard Schoen
Web:=A0http://www.richardschoen.net
Email:=A0richard-DiTrGpQEJGItADg8e/3/[email protected]

----------------------------------------------------------------------

message: 1
date: Wed, 6 May 2026 12:01:29 +0200
from: Luca Giammattei <[email protected]>
subject: Call a rpg program from a node script running on an external
	windows or linux server

Hi everyone, I may soon find myself in the situation in question: a web app=
 running on a Linux or Windows server needs to access data on the Power Ser=
ver. =

Obviously, this involves structured information based on a well-defined and=
 consolidated calculation in a business logic managed by three RPG programs=
 that have been doing their job effectively for 20 years. The only change w=
as made about twenty years ago, and a parameter was added to the programs t=
hat simply creates an PF-DTA object as an output file with this data to be =
later managed.
So, back to the point: what's the best way to allow a Node.js script runnin=
g on a Linux (or Windows) server to connect with a specific user to a Power=
 Server on IBM i 7.3 or 7.5 and make a call pgm1(parm1); wait a few millise=
conds for the execution time and then retrieve a database file? Has anyone =
had similar experiences? Perhaps encapsulate the pgm in an SQL function?
Thanks in advance to anyone who can share their experiences.


-- =

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