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

[elactrum]

On 2012-09-27 11:05, elact...@jamailca.com wrote:

On 2012-09-27 10:19, Daniel-Constantin Mierla wrote:

Hello,

On 9/26/12 9:47 PM, elact...@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

I have now duplicated this on the following systems:

Alpine Linux (2.4.5) - kamailio-3.3.0-r0@edge
Ubuntu (12.04.1) - kamailio-3.3.0+precise1
Ubuntu (12.04.1) - kamailio-3.3.0+wheezy1


Only certain pseudovariables are affected:

sr.pv.sets("$sht(name=>key)") fails
sr.pv.sets("$avp(name)") fails
sr.pv.sets("$xavp(name)") fails
sr.pv.sets("$shv(name)") works
sr.pv.sets("$var(name)") works

Do you need any more information to track this problem?


Thanks,

-Andrew


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