Forum Discussion
Kalyan_Reddy_Da
Nimbostratus
NimbostratusIrule with if-elseif to change to Switch-glob
Irule with if-elseif to change to Switch-glob
Please help me if anyone know how to change this if-else-if irule to switch-glob.
when HTTP_REQUEST {
if {([HTTP::cookie "TestCookie"] ne "") && ([HTTP::header "TestHeader"] eq "")} {
Execute some statements
}
elseif { [HTTP::cookie "ABCD"] contains "testvaluel" } {
Execute some statements
}
elseif {[HTTP::header "DEF"] ne "" } {
Execute some statements
}
elseif { ([HTTP::uri] starts_with "/abc/def/") } {
Execute some statements
}
}
3 Replies
hoolioCirrostratus
Hi Kalyan,
A switch statement can only be used to check one string against a number of changes. If you wanted to check the requested URI for several different possible values, you could use a switch statement. It cannot be use to check multiple strings for multiple cases. So the current if/elseif/.../else syntax you're using is the best option.
For details on the switch statement, you can check the DC and TCL wikis:
http://devcentral.f5.com/wiki/default.aspx/iRules/switch
http://www.tcl.tk/man/tcl8.4/TclCmd/switch.htm
Aaron
Kalyan_Reddy_DaThank you Aaron for the quick reply. Appreciate your help.
Aaron,
Could you please let me know whether this can be changed to switch?
set pool_name p_test_$TEST
if { [catch { pool $pool_name } ] } {
Execute some commands
} else {
pool $pool_name
}- hoolioCatch can only ever return 0 or 1 based on whether the command it's executing returns an error or not, so I don't think there is any advantage to using switch. But if you wanted to, you could do this:
set pool_name p_test_$TEST switch [catch { pool $pool_name } ] { 0 { No error, so the pool was already assigned and you don't have to do anything more } 1 { Error, so do something else Execute some commands } }
Note that catch will run the command in the braces. So you don't have to call the pool command again. You could simplify your original rule like this:set pool_name p_test_$TEST if { [catch { pool $pool_name } ] } { Error assigning pool $pool_name, so do something else }
Aaron
