Executing Actions on Global Interaction / Global Hooks?

Question

Question

Niklas Thilmont · Mar 14, 2022

#Globals #InterSystems IRIS #InterSystems IRIS for Health

Hey InterSystems Community!

This is probably far-fetched - is there a way to get notified/get a piece of code triggered whenever the state of a global changes?

Now what could I possibly want with that? Quite simple! I would like to forward the content of a global (in this case the "FSLog" global written by the FHIR implementation) while adding timestamps to it - to create some sort of file-based logging for it.

Product version: IRIS 2021.1

Discussion (9)3

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Robert Cemper · Mar 14, 2022

If your global is part of a class/table class parameter DSTIME could be an approach.
or any SQL trigger or any %OnAfterSave, %OnAfterDelete, ...

For pure Globals all you have is the Journal (if enabled)

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Michael Poxon · Mar 14, 2022

Following on Robert's idea of the journal, you might set up a shadow server with a custom filter routine. That routine could examine each journaled global set/kill that comes to it, choose the ones it cares about and do something with them, then "quit 0" so the shadow doesn't actually dejournal the activity.

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Marc Mundt · Mar 14, 2022

How about polling the global looking for updates? It would be lightweight to just check if the value of ^FSLOG has incremented since the last check:

set lastFSEntry = ^FSLOG

or use $order:

set lastFSEntry = $order(^FSLOG(""),-1)

As for timestamps, in my test environment all of the ^FSLOG entries seem to end with timestamps already:

^FSLOG(41)="DispatchRequest^HS.FHIRServer.Service^11062|Msg|  [1] -> DO  0|03/14/2022 01:57:19.398158PM"

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Herman Slagman · Mar 14, 2022

The only way you could accomplish this is by watching the journal files, there would be journals like "Set Global" and "Kill Global"

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score 0 · Answer 1 · 2022-03-15T06:10:47-04:00

Sadly it's a pure global in this case. But I will keep that in mind for the future, as logging to globals seems to be a common thing, and some actually are backed by classes.

score 0 · Answer 2 · 2022-03-15T06:12:01-04:00

We were thinking of using filebeat anyway. This might actually work smooth enough, with filebeat on the journal, filtering in a later step? I'll have to take a closer look at the journal itself, thank you!

score 0 · Answer 3 · 2022-03-15T06:07:35-04:00

Mine doesn't do that - yet. Still using HealthShare 2020.1. I assume it'll be added with a later version!

11:     ^FSLOG(10)    =    "DispatchRequest^HS.FHIRServer.Service^3245|Msg|Dispatch interaction search-type for MedicationAdministration"
12:     ^FSLOG(11)    =    "BuildIncludeList^HS.FHIRServer.Service^3245|_include|include: "
13:     ^FSLOG(12)    =    "BuildRevIncludeList^HS.FHIRServer.Service^3245|_include|revInclude: "

As for the polling - I guess with a timestamp maybe added in the future (We're planning to upgrade soon), this may very well be the smartest solution. Thanks!

score 0 · Answer 4 · 2022-03-14T17:11:16-04:00

As it happens, if you use the Node.js-based QEWD framework, any time you use the QEWD-JSdb APIs that modify a global node (eg set, kill, increment etc), an event is triggered that you can write your own customer handler for.

It's described in this set of training slides: https://www.slideshare.net/robtweed/ewd-3-training-course-part-26-eventd...

score 0 · Answer 5 · 2022-03-15T07:48:15-04:00

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