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· Mar 2

IO-Redirect package on Linux

#InterSystems IRIS for Health

Hi,

Has anyone used 'IO-Redirect' package?

https://openexchange.intersystems.com/package/io-redirect

IRIS for me runs on a Linux server.

I want the package to be able to supply "answers" from a Linux OS file in response to a program run as follows:
do ^ADMIN
I'm assuming that the program does objectscript reads from the terminal

Questions

1. Is docker required? Docker is not installed on the server.
2. Would the package be able to handle redirect I/O in this case?
    Would I have to write extra code (objectscript) to read the Linux file as a "stream"?
3. How would I  install the package? Would I have to download the package first? 
4. In the program most of the read from terminal require a <CR> but some read from terminal do not require a <CR>
    I'm assuming that the read that do not require a <CR> read the input character by character.
   Would the package handle this situation?
4. Would it be easy to convert the program to read the input directly from an OS file?

Thanks in advance

Discussion (2)2
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Robert Cemper · Mar 3

do ^ADMIN  indicates that you run a classic straight ObjectScript program.
while WRITE just has 1 direction to act  READ is bi-directional.
READ can send some text as prompt and waits for reply.
The only bi-directinal device I know of are network connections as TCP, UDP, TRM,FTP,..
The common feature is : they communicate out of your IRIS instance.

Inside IRIS  you may do a redirection e.g to some TCP port like |TCP|7000
but then this port is blocked. No other process can touch |TCP|7000.
So you need an external port wrapper to some other port. e.g. |TCP|7100

Then you can handle this bi-directional communication either by sequence
or you have a list of prompts and the expected replies or similar. 

The sequence of operation could then be:

  • have a STARTER that runs in background
    • initiate the external wrapper 
    • run do ^ADMIN
  • start the FOREGROUND 
    • connect to external wrapper
    • send prompts to terminal
    • get replies from external file
    • send it back to port
    • which forwards it to  ^ADMIN hanging in background

 The most tricky point is to handle situations where the communication
if it is not just 1 Prompt :=> 1 Answer  but
multiple Prompts or WRITEs  :=>1 Answer or 1 Prompt :=> multiple Answers.

So I'd suggest instead of an IRIS internal solution rather look for an
external Terminal program to consume and apply your answer script.  
 

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