[Tsung] Calling a %%module:function%% multiple times with same Pid

[Pablo Polvorin]

Hi Martin,

>>A workaround would be to allow putting the result
>>of a %%module:function%% call into a dynamic
>>variable, that could then be used to refer to the
>>same data later

there is a new feature available in svn trunk that let
you do exactly that. I think it isn't documented yet,
but take a look at
http://svn.process-one.net/tsung/trunk/examples/http_setdynvars.xml.in
for some sample usage.

Basically, all you need to do is add a setdynvar
element to your session:
<setdynvars sourcetype="random_number" start="3"
end="32">
     <var name="rndint" />
</setdynvars> 
That defines a variable named rndint, that can be used
as many times as you need (in that session).

<request subst="true"><http>...%%_rndint%%...
<request subst="true"><http>...%%_rndint%%...
   
(look at the samples, there are other source types
availables other than random_number, including erlang
callbacks)

cheers,
pablo



--- "Stein, Martin" <martin.stein at sap.com> escribió:

> I am using the %%module:function%% feature to
> generate one random
> number, that is subsequently reused.
> 
>  
> 
> Basically I have one call to generate a new ID that
> is returned and
> stored in an ETS table with the Pid. (putCID)
> 
> Another call retrieves the ID for the given PID, and
> the last call
> deletes the item in the ETS table.
> 
>  
> 
> This is done, so that a generated random ID can be
> used a couple of
> times in one session.
> 
>  
> 
> <session>
> 
> <request><http>...%%ran500:putCID%%...
> 
> < request><http>...%%ran500:getCar%%...
> 
> <request><http>...%%ran500:getCar%%...
> 
> <request><http>...%%ran500:deleteCID%%... 
> 
> </session>
> 
>  
> 
> The code for the functions is straightforward and at
> the end of the
> message.
> 
>  
> 
> When I run with 10 users/sec things work fine, but
> with more users this
> fails.
> 
>  
> 
> ts_client:(5:<0.65.0>) Stop in state wait_ack,
> reason= {badarg,
> 
>  
> [{ets,
> 
>  
> delete,
> 
>  
> [tsungtest,
> 
>  
> <0.65.0>]},
> 
>  
> {ran500,
> 
>  
> deleteCID,
> 
>                                                     
>                 1},
> 
>  
> {ts_search,
> 
>  
> extract_function,
> 
>                                                     
>                 5},
> 
>  
> {ts_search,
> 
>  
> subst,2},
> 
>  
> {ts_http,
> 
>  
> subst,2},
> 
>  
> {ts_http,
> 
>  
> add_dynparams,
> 
>                                                     
>                 4},
> 
>  
> {ts_client,
> 
>  
> handle_next_request,
> 
>                                                     
>                 2},
> 
>  
> {gen_fsm,
> 
>  
> handle_msg,
> 
>  
> 7}]}
> 
>  
> 
>  
> 
> I assume that in one session the Pid would be the
> same throughout the
> session. So the 4 calls to my ran500 module should
> all be made with the
> same Pid in the argument, even at higher loads.
> 
>  
> 
> A workaround would be to allow putting the result of
> a
> %%module:function%% call into a dynamic variable,
> that could then be
> used to refer to the same data later. Maybe the
> <dyn_variable> could be
> extended to a <dyn_function> that calls a function
> and stores the
> result?
> 
>  
> 
> Thanks!
> 
>  
> 
>  
> 
> ------------------------------------- code
> 
>  
> 
> %%% File    : ran500.erl
> 
> -module(ran500).
> 
> -export([putCID/1, getCar/1, deleteCID/1]).
> 
>  
> 
> randomCar() ->
> 
>     io_lib:format("~p.VCar", [random:uniform(500)]).
> 
>  
> 
> % put generated ID into ETS
> 
> putCID({Pid, _DynData}) ->
> 
>     case ets:info(tsungtest) of
> 
>                 undefined ->
> 
>                     ets:new(tsungtest, [named_table,
> public]);
> 
>                 _Otherwise -> ok
> 
>                 end,
> 
>     Car = randomCar(),
> 
>     true = ets:insert(tsungtest, {Pid, Car}),
> 
>     Car.
> 
>  
> 
> % get car for cid in Dyndata
> 
> getCar({Pid, _DynData}) ->
> 
>     [{_PidKey, Carname}] = ets:lookup(tsungtest,
> Pid),
> 
>     Carname.
> 
>  
> 
=== message truncated ===>
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