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#!/usr/bin/env lua
local socket = require "socket"
local uloop = require("uloop")
uloop.init()
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:set(1000)
end
timer = uloop.timer(t)
timer:set(1000)
-- timer example 2 (will run once)
uloop.timer(function() print("2000 ms timer run"); end, 2000)
-- 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")
print(r)
end
function p2(r)
print("Process 2 completed")
print(r)
end
uloop.timer(
function()
uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=1"}, p1)
end, 1000
)
uloop.timer(
function()
uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=2"}, p2)
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()
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