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Is there a way in an iRule to determine if an ASM policy exists before doing an ASM::enable on it?

I am trying to base the ASM policy i assign to my inbound connections on the URL in my iRule. If i do an ASM::enable on a policy that does not yet exist the connection/session fails.

Is there a way to check if the ASM policy exists before doing an enable? Something like:

if { [AMS::policy exists $policy] } { ASM::enable $policy }

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Answers to this Question



It seems like what you are looking for is the iRules 'catch' statement. This will try to run a piece of code and check for any runtime errors. If there is any error, it will run a second block of code instead. This will help you check if a certain policy exists. I haven't properly tested this code, but I believe your solution should look something like this.

if { [catch {
     ASM::enable $policy
     log local0. "$policy was enabled"  
     }] } then {
        # This block only triggers if the above code would fail
        log local0. "$policy does not exist"

More information here, if you would like to research some more yourself.

Comments on this Answer
Comment made 2 months ago by sogboj 2

Hi, thanks for the response. I will give it a try. I was hoping from something more built-in that doesn't force a failure. Like using 'exists' for a class.