Re: [HTCondor-users] transform syntax to build complex ads possible?

["Sever, Krunoslav" <krunoslav.sever@xxxxxxx>]

Hi,

this looks like a useful feature and I tried to use it to break up our IfThenElse() construct in our JobTransform:

eval_set_AccountingGroup = ifThenElse( cond1, \
  value1 \
  ifThenElse(cond2, \
    value2, \
    ...
  ) \
)

As condor_status -limit 1 -af '[a=Name]["a"]' resolves to the Name from the machine ad, I tried the replacement

EVALSET AccountingGroup = [
  x1 = ifThenElse(cond1, value1,undefined);
  x2 = x1 ?: ifThenElse(cond2, value2, undefined);
  ...
  x<n> = x<n-1>?: ifThenElse(cond<n>, value<n>, default);
]["x<n>"]

A reconfig accepted the transform (judging from the D_FULLDEBUG output in SchedLog) but the conditions failed to access job ad to be transformed.

Testing this with a simpler transform like

EVALSET TEST = [ a=Project ]["a"]

set undefined in the transformed job, even though Project is set in the original submit.

Aa an aside, I initially tried with eval_set, where it also reordered the x<i> lines which does not happen with EVALSET.

I assume this is a bug? If so, I'd appreciate a fix somewhere down the line, modifying the current construct is very error-prone...

Maybe it is not even too hard to add a function like

  ifThenElseChain(cond1, val1, ..., condn, valn, default)

This would take care of short-circuiting which my replacement lacks - not too important, but could be nice...

Best
  Kruno

----- Original Message -----
> From: "John M Knoeller" <johnkn@xxxxxxxxxxx>
> To: "HTCondor-Users Mail List" <htcondor-users@xxxxxxxxxxx>
> Sent: Thursday, 7 October, 2021 18:03:28
> Subject: Re: [HTCondor-users] transform syntax to build complex ads possible?

> the GROUP_SORT_EXPR cannot be a classad, because it needs to evaluate to an
> integer
> but the expression can contain one or more classads as part of the expression
> 
> for example
> 
>> condor_status -limit 1 -af '[a=1;b=2]["a"]'
> 1
>> condor_status -limit 1 -af '[a=1;b=2]["b"]'
> 2
>> condor_status -limit 1 -af '[a=1;b=2]["c"]'
> error
> 
> In the above [a=1;b=2] declares a classad,  and ["a"]  does a lookup within that
> classad for attribute a.
> the result of evaluation will be 1
> 
> -tj
> ________________________________
> From: HTCondor-users <htcondor-users-bounces@xxxxxxxxxxx> on behalf of Thomas
> Hartmann <thomas.hartmann@xxxxxxx>
> Sent: Thursday, October 7, 2021 8:32 AM
> To: HTCondor-Users Mail List <htcondor-users@xxxxxxxxxxx>
> Subject: [HTCondor-users] transform syntax to build complex ads possible?
> 
> Hi all,
> 
> is it actually possible, to write a a class ad in the new transform
> syntax (i.e., w/o square brackets)?
> 
> AFAIS it is no macro/function/... where I can return a value, or?
> 
> Background is, that I would like to refactor a `GROUP_SORT_EXPR`, that
> has grown over time into a forest of IfThenElse()'s.
> 
> If I get it correctly, a 'macro' in the []-syntax is effectively a
> complex class ad. But I am not sure, if I can evaluate/set a new
> transform-like expression directly into an ad?
> 
> Cheers,
>   Thomas
> 
> 
> 
> 
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-- 
------------------------------------------------------------------------
Krunoslav Sever            Deutsches Elektronen-Synchrotron (IT-Systems)
                        Ein Forschungszentrum der Helmholtz-Gemeinschaft
                                                            Notkestr. 85
phone:  +49-40-8998-1648                                   22607 Hamburg
e-mail: krunoslav.sever@xxxxxxx                                  Germany
------------------------------------------------------------------------