Is better to fetch mail using 'cron' + 'fetchmail' or 'getmail'. I think.
But, the question is worth the trouble (statusd_dgs.lua by Jeremy Hankins is a
good example
on this). I will draw some answers, actually, I only tried the third answer:
Lets assume: defaults = { update_interval = 4*1000, foo_interval = 2.5*60*1000
}
local settings = table.join( ... )
1-) A simple statement accumulating time running in some foo variable:
local foo = settings.update_interval --> foo is actually a global
variable
if [ foo >= foo_interval ] then
fetch_something()
foo = settings.update_interval --> If its done, re-init foo
else
foo = foo + settings.update_interval --> Acummulate time
running
end
-- The bad thing about this is that the real foo_interval is not exactly 2.5
minutes for some
-- possible cases. Also, an update_interval bigger than foo_interval will make
useless the
-- foo_interval, but could work for some body. Lets Move on.
2-) A function to calculate internal times:
local init_time = os.time()*1000 --> A fallacy to calculate
update_interval milliseconds
local new_update = settings.update_interval
--> A declaration like this must be done at the top of the script.
function check_foo()
local time = os.time()*1000 - init_time
if time == foo_interval then
fetch_something()
init_time = init_time + foo_interval
new_update = settings.update_interval --> Re-init
normal update_interval
return
elseif ( time + settings.update_interval > foo_interval ) and
( foo_interval - time < settings.update_interval) then
new_update = foo_interval - time
return
end
end
function update_foo()
check_foo()
show_foo()
foo_timer:set(new_update, update_foo) --> Internal
'update_interval' is new_update
end
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