How to execute a rule from the native rule language

[S. Stoica]

Hello everyone, 

Is there a way to execute a rule from within a microservice in a synchronous way? Something in line with a msiExecCmd  maybe? 
Ideally I would like to be able to specify which active plugin instance should pick up the rule execution and also be able to pass on arguments. Basically, a replacement for this in the native rule language. 

irule -r irods_rule_engine_plugin-logical_quotas-instance-s "my_rule(*arg)" "*arg=0" "ruleExecOut"


delay(<>){} does not fit because the execution is not synchronous. 

Any ideas?

The only way I can think of now is to include the rule in a bash script and place it in  /var/lib/irods/msiExecCmd_bin/. However this seems a bit cumbersome and maybe irods has already something built in that i might have missed? 

Thanks in advance,
Simona

[Terrell Russell]

Hi Simona,

I'm not exactly sure what you're looking to do...

If you have the ability to call msiExecCmd(), or delay(), then you should also be able to call any named rule that exists in your loaded rulebases directly.

Have you tried to just call my_rule(*arg) directly?

# core.re
simona_rule1(*a, *b) { simona_rule2(*a, *b); }
simona_rule2(*arg1, *arg2) { writeLine('stdout', "arg1=[*arg1] arg2=[*arg2]"); }

then calling the first rule manually...

$ irule -r irods_rule_engine_plugin-irods_rule_language-instance 'simona_rule1(*a, *b)' '*a="apples"%*b="bananas"' ruleExecOut
arg1=["apples"] arg2=["bananas"]

Terrell

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[Stoica, S.]

Let me clarify a bit what I am trying to accomplish. 

The point is I am trying to find a work round to call the rule from the logical quota operations via the rule plugin. However the triggers are placed in the rule language ( eg on collection created, activate quota). 

Since i have mitigated the usage of the microservices by using the suggestion in here (https://github.com/irods/irods_rule_engine_plugin_logical_quotas/issues/132) I have no way of invoking the microservice directly as its execution is disabled. 

How can i then invoke the execution of e.g this:

irule -r irods_rule_engine_plugin-logical_quotas-instance '{"operation": "logical_quotas_get_collection_status", "collection": "/tempZone/home/rods"}' null ruleExecOut

from the core rule language?
Any suggestion is welcome. 

Simona 

To view this discussion visit https://groups.google.com/d/msgid/irod-chat/CAFaqtebjzV-cbbgQ92ctpocUFb%3D4u02Xq_xpD8JGPCsGdqLU_w%40mail.gmail.com.

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Dr. Simona Stoica

Software Developer CIT

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[Terrell Russell]

Ah!  I see...

So you need the INST_NAME of the rule engine plugin...

And that is available to the remote() call (as well as the delay() call).

https://docs.irods.org/5.0.1/plugins/pluggable_rule_engine/#remote-execution

However, with this... you still cannot send the JSON payload to the rule from the iRODS rule language itself...

So...

Here is an example of your proposed workaround (using msiExecCmd)...

# core.re

simona_rule3(*a) { simona_rule4(*a); }
simona_rule4(*col) {
  msiExecCmd("simona.sh", *col, "null", "null", "null", *result);
  msiGetStdoutInExecCmdOut(*result, *out);
  writeLine('stdout', *out);
}

$ irule -r irods_rule_engine_plugin-irods_rule_language-instance 'simona_rule3(*col)' '*col=/tempZone/home/rods' ruleExecOut
{"irods::logical_quotas::maximum_number_of_data_objects":"","irods::logical_quotas::maximum_size_in_bytes":"","irods::logical_quotas::total_number_of_data_objects":"160","irods::logical_quotas::total_size_in_bytes":"264759060"}

Terrell

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