Best practive for iRules-LX calls with a proc

I have just found out that ILX::init cannot be called in a RULE_INIT block: The ILX iRule doc says "Valid During: ANY_EVENT with the exception of RULE_INIT". So, static is not necessary.

If you want to reuse the RPC handle, create the handle in the first event block, and make a proc to accept the handle as an argument. e.g.,

    proc send_req {message handle} {
      set response [ILX::call $handle AsrFunc1 $message]
      return $response
    }

    when CLIENT_ACCEPTED {
      set RPC_HANDLE [ILX::init AsrPlugin "AsrExt"]
      log local0. "ACCPT: [call send_req "hello_req" $RPC_HANDLE]"
    }

    when HTTP_REQUEST {
      log local0. "REQ: [call send_req "hello_req" $RPC_HANDLE]"
    }

    when HTTP_RESPONSE {
      log local0. "RESP: [call send_req "hello_resp" $RPC_HANDLE]"
    }

An issue is maintainability. When the code becomes longer, finding the RPC_HANDLE variable would become tedious. Also, when you add another event that occurs before the handle initialisation (e.g., FLOW_INIT starts before CLIENT_ACCEPTED), you get a TCL error. So, I would still (personally) go for the init next to call style (assuming ILX::init is cheap).