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Forum Discussion

MACTEP's avatar
MACTEP
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Feb 25, 2013

Check if static variable exists before referencing to it

Hi All,     I have created an iRule performing DNS lookup and storing the result in static variable, so it could be referred from another iRule.   ....   set static::my_variable "some v...
application delivery
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MACTEP's avatar
MACTEP
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Feb 26, 2013
Confirmed, works as expected whenever variable is defined, not defined, has empty or non-empty value. 

if {[info exists "static::my_variable"]}{
log local0.err "Variable my_variable is defined"
   if {"${static::my_variable}X" eq "X"}{
      log local0.err "variable value is empty"
   } else {
      log local0.err "variable value is ${static::my_variable}" 
           }
} else {
log local0.err "Variable static::my_variable is NOT defined"
}