[SR-Users] pseudovariable values written from app_lua sometimes appear incorrect

[elactrum at jamailca.com]

On 2012-09-27 10:19, Daniel-Constantin Mierla wrote:
> Hello,
>
> On 9/26/12 9:47 PM, elactrum at jamailca.com wrote:
>> Hi,
>>
>> I am using app_lua to frequently store some data in htable and avp 
>> entries, using sr.pv.sets. When I read the values using sr.pv.get 
>> immediately after writing them, they seem correct. However, when I 
>> read them later from Lua, I have noticed that sometimes the value is 
>> incorrect or nil. Am I doing something wrong?
>>
>> The following code uses rtimer to duplicate the problem on startup, 
>> printing the errors to syslog.
>>
>> Tested on version: kamailio 3.3.1 (i386/linux) 2d0f6f
>>
>> ###############
>> # kamailio.cfg
>> ###############
>> loadmodule    "pv.so"
>> loadmodule    "xlog.so"
>> loadmodule    "htable.so"
>> loadmodule    "rtimer.so"
>> loadmodule    "app_lua"
>>
>> modparam("htable", "htable", "status=>size=14;autoexpire=0;")
>>
>> modparam("rtimer", "timer", "name=ta;interval=10;mode=1")
>> modparam("rtimer", "exec", "timer=ta;route=LUA_TEST")
>>
>> # the following path may need to change depending on filesystem 
>> setup
>> modparam("app_lua", "load", "/etc/kamailio/kamailio.lua")
>>
>> route
>> {
>>     route(LUA_TEST);
>> }
>>
>> route[LUA_TEST] {
>>
>>         $var(lua_test_key) = $(pp{s.toupper}) + "::";
>> lua_runstring("htable_test([[status=>$var(lua_test_key)]])");
>> lua_runstring("avp_test([[status=>$var(lua_test_key)]])");
>>
>> }
>>
>> ----------------
>> -- kamailio.lua
>> ----------------
>> -- Test of sr.pv operations in Lua
>>
>> function htable_test (namekey)
>>     local pvar_prefix = "$sht("..namekey
>>     pvar_test(pvar_prefix)
>> end
>>
>> function avp_test ( name )
>>     local pvar_prefix = "$avp("..name
>>     pvar_test(pvar_prefix)
>> end
>>
>>
>> function pvar_test ( pvar_prefix )
>>
>>     for value = 10000, 10050 do
>>         local pvar = pvar_prefix..value..")"
>>         --sr.log("info", "Lua attempting to set '"..pvar.."' to 
>> value '"..value.."'")
>>         sr.pv.sets(pvar, value)
>>     end
>>
>>     for value = 10000, 10050 do
>>         -- now we check what was stored
>>         local pvar = pvar_prefix..value..")"
>>         local checkvar = sr.pv.get(pvar)
>>         if ( tostring(checkvar) ~= tostring(value) ) then
>>             sr.err(string.format("CHECK: Lua checking pvar '%s' and 
>> got value '%s' which is NOT '%s'",
>>                 tostring(pvar),
>>                 tostring(checkvar),
>>                 tostring(value)
>>             ))
>>         end
>>
>>     end
>> end
>> -- end of kamailio.lua
>
> can you provide the log messages?

Sorry, I should have included them with the initial posting. I have 
attached an example of the first seven executions of rtimer after a 
fresh startup. Each startup of kamailio results in slightly different 
error values, but the pattern seems similar.

Please let me know if it would be good to send more logs or anything 
else.


> Note that avps are destroyed after
> execution of the rtimer route - avps are attached to
> message/transaction. Hash table values should stay no matter where 
> are
> set.

Thanks for the reminder. I think in this case the test is valid, 
though, since the avp values are written and read within a single rtimer 
route.

>
> Cheers,
> Daniel

Thanks for the help!

-Andrew
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