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World.DoAfter bug

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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Sun 16 Oct 2005 04:10 PM (UTC)
I am using World.DoAfter to send lines of text to the mud (so as not to spam it, sort of like "Paste to world") in my script, but the lines sometimes do not arrive in the order I sent them from my script. This could probably be fixed if I made the time a decimal and increased the resolution, but that would take up many resources (it's an old PC) and I think this is a bug that should be fixed.

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Nick Gammon   Australia  (21,607 posts)  [Biography] bio   Forum Administrator
Date Reply #1 on Sun 16 Oct 2005 09:21 PM (UTC)
It's not a bug. Nowhere in the documentation does MUSHclient claim to execute timed events, in the order in which they are submitted, limited to the timer resolution.

In other words, if you do this:

DoAfter 1, "test A"
DoAfter 1, "test B"
DoAfter 1, "test C"

MUSHclient does not claim they will be executed in that order. The examples given in various places of doing timed events in sequence usually (always?) give different time intervals, like this:

DoAfter 1, "test A"
DoAfter 2, "test B"
DoAfter 3, "test C"

As an analogy, imagine you invite 5 friends around to eat dinner with you "at 6 o'clock - give or take a minute". Assuming your friends aren't late, you have no expectation that they will arrive in the order you asked them, they will simply arrive at the time given, within the resolution you specify, in this case within 1 minute of 6 o'clock.

MUSHclient works the same way.

To solve your problem, where you want the commands to be executed in sequence, I suggest that you use the queued system using Lua coroutines, that has been discussed a fair bit recently.

One approach would be to make a small plugin, that queues up commands to be sent, using that idea, pulling them out of the queue every second, and keeping them in order.

To save you a bit of effort, I have made a plugin to do just that. It will queue up commands and send them to the MUD every second. Since they are queued (in an internal Lua table) they will always be sent in the order they are queued, regardless of how quickly you queue them.

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE muclient>
<!-- Saved on Monday, October 17, 2005, 7:02 AM -->
<!-- MuClient version 3.67 -->

<!-- Plugin "Command_Queue" generated by Plugin Wizard -->

   author="Nick Gammon"
   purpose="Queues up commands and sends one every second"
   date_written="2005-10-17 06:47:09"


<!--  Script  -->


-- queue of things to send
queue = {}

-- called by a timer to resume a thread
function wait_timer_resume (name)
  assert (coroutine.resume (thread))
end -- function wait_timer_resume 

function worker_thread (thread)

  while true do
    coroutine.yield () -- wait a second
    if table.getn (queue) > 0 then
       Send (table.remove (queue, 1))
    end -- of having an entry in the table

  end  -- of infinite while loop
end -- function worker_thread 

function OnPluginInstall ()

  -- timer will be called every second to kick things along
  status = AddTimer ("wait_timer", 0, 0, 1, "",
            timer_flag.Enabled + 
            timer_flag.Temporary + timer_flag.Replace, 
  assert (status == error_code.eOK, error_desc [status])

  -- start up worker thread
  thread = coroutine.create (worker_thread)
  assert (coroutine.resume (thread, thread))

end -- function OnPluginInstall

function OnPluginConnect ()

  queue = {}    -- start afresh when connecting

end -- function OnPluginConnect

function QueueIt (what)

  table.insert (queue, what)  -- insert into our queue

end -- function QueueIt 



An example of calling it is below:

for i = 1, 10 do
  CallPlugin ("685b994664e3afced386d332", "QueueIt", "think test " .. i)

We are using CallPlugin to communicate with the plugin, however if an alias was required you could add it to the plugin easily enough.

If you execute this test code a couple of times it will slowly count to 10, without getting out of sequence.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Poromenos   Greece  (1,037 posts)  [Biography] bio
Date Reply #2 on Tue 18 Oct 2005 09:40 PM (UTC)
Hmm... Wouldn't it be simpler for MC to add/evaluate the timers in order? Or doesn't it work that way?

Vidi, Vici, Veni.
http://porocrom.poromenos.org/ Read it!
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Posted by Nick Gammon   Australia  (21,607 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Wed 19 Oct 2005 06:24 AM (UTC)
Well, timer events are not placed in a queue, because by their nature they have to be executed when the time expires, which is not necessarily related to the order in which you create timers.

A simple solution to your problem is to simply do something like this:

DoAfter 1, "think this" & vbCrLf & "think that"

That way, when the timer fires, the things you want it to do are done in order. If the script gradually builds up the string, then it could simply concatenate a string, and then at the end do the DoAfter.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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