#!/usr/bin/env lua
+local socket = require "socket"
+
local uloop = require("uloop")
uloop.init()
--- timer example 1
+local udp = socket.udp()
+udp:settimeout(0)
+udp:setsockname('*', 8080)
+
+-- timer example 1 (will run repeatedly)
local timer
function t()
print("1000 ms timer run");
timer = uloop.timer(t)
timer:set(1000)
--- timer example 2
+-- timer example 2 (will run once)
uloop.timer(function() print("2000 ms timer run"); end, 2000)
--- timer example 3
+-- timer example 3 (will never run)
uloop.timer(function() print("3000 ms timer run"); end, 3000):cancel()
+-- periodic interval timer
+local intv
+intv = uloop.interval(function()
+ print(string.format("Interval expiration #%d - %dms until next expiration",
+ intv:expirations(), intv:remaining()))
+
+ -- after 5 expirations, lower interval to 500ms
+ if intv:expirations() >= 5 then
+ intv:set(500)
+ end
+
+ -- cancel after 10 expirations
+ if intv:expirations() >= 10 then
+ intv:cancel()
+ end
+end, 1000)
+
-- process
function p1(r)
print("Process 1 completed")
end, 2000
)
+-- SIGINT handler
+uloop.signal(function(signo)
+ print(string.format("Terminating on SIGINT (#%d)!", signo))
+
+ -- end uloop to terminate program
+ uloop.cancel()
+end, uloop.SIGINT)
+
+local sig
+sig = uloop.signal(function(signo)
+ print(string.format("Got SIGUSR2 (#%d)!", signo))
+
+ -- remove signal handler, next SIGUSR2 will terminate program
+ sig:delete()
+end, uloop.SIGUSR2)
+
+-- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
+-- .delete will manually untrack.
+udp_ev = uloop.fd_add(udp, function(ufd, events)
+ local words, msg_or_ip, port_or_nil = ufd:receivefrom()
+ print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
+ if words == "Stop!" then
+ udp_ev:delete()
+ end
+end, uloop.ULOOP_READ)
+
+udp_count = 0
+udp_send_timer = uloop.timer(
+ function()
+ local s = socket.udp()
+ local words
+ if udp_count > 3 then
+ words = "Stop!"
+ udp_send_timer:cancel()
+ else
+ words = 'Hello!'
+ udp_send_timer:set(1000)
+ end
+ print('Send UDP packet to 127.0.0.1:8080 :'..words)
+ s:sendto(words, '127.0.0.1', 8080)
+ s:close()
+
+ udp_count = udp_count + 1
+ end, 3000
+)
+
uloop.run()