[Freeswitch-users] Which Lua script am I?

Michael Collins msc at freeswitch.org
Fri Mar 5 11:16:26 PST 2010

May I ask what the end goal is? It could be that there are better tools in
the toolbox to help you...


On Fri, Mar 5, 2010 at 11:04 AM, Mike van Lammeren <mike at van.lammeren.net>wrote:

> Hello!
> I am working on a high-availability system and need a Lua script that can
> run in the background and loop forever, periodically waking up to accomplish
> some tasks. I would like to be able to handle at least 10 concurrent tasks.
> My first idea was to have a simple background script that would call
> another script, let's call it the 'task' script, every 5 seconds or so. This
> would spread the work around, and if any task script quit with an error, the
> background script would remain running, and would continue to launch new
> task scripts.
> However, I can see no way for the background script to launch other Lua
> scripts. Am I missing something? I need something like session:execute(),
> but unfortunately this background script has no session, and I'm not sure if
> session:execute() can even make a call like the "luarun" console command.
> So, my next ideas was to have 10 copies of the background script. Each
> script would loop forever. Upon launch, each script would perform a single
> task, then sleep for 60 seconds. This allows handling of 10 concurrent
> tasks.
> However, there are some problems with running 10 copies of the same script,
> which I believe can be solved if each script could be given a unique
> identifier. One problem is that I would like the scripts to actually sleep
> for a variable amount of time, say between 55 and 65 seconds, so that the
> workload would spread around. Another, similar problem, is that each script
> needs to 'claim' a number of database records from a table that is queuing
> up work for the scripts. Once again, if each script had a unique identifier,
> then I could use an update query to effectively 'set and test' a record that
> would be tied to that script instance.
> I could use a random number to identify each script, but since math.random
> is seeded with a timestamp that only resolves to seconds, then all 10
> scripts will be given the same sequence of random numbers, and all 10 will
> run in lock-step with each other. So, random numbers are out. (If I had a
> unique ID to seed the random number generator, then I could just use that
> unique ID and wouldn't need random numbers.)
> Is there a way of uniquely identifying 10 Lua scripts that FreeSWITCH
> launches at startup?
> Or is there a better way of handling this situation altogether? I'm open to
> any suggestions that people would care to make!
> (I would entertain the idea of a single script that would start with
> FreeSWITCH, then launch 10 other scripts, giving each a unique identifier,
> but that brings me back to the original problem of not knowing how to launch
> other Lua scripts under FreeSWITCH.)
> Mike van Lammeren
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