examples/uloop-example.lua

   1 #!/usr/bin/env lua
   2
   3 local socket = require "socket"
   4
   5 local uloop = require("uloop")
   6 uloop.init()
   7
   8 local udp = socket.udp()
   9 udp:settimeout(0)
  10 udp:setsockname('*', 8080)
  11
  12 -- timer example 1 (will run repeatedly)
  13 local timer
  14 function t()
  15         print("1000 ms timer run");
  16         timer:set(1000)
  17 end
  18 timer = uloop.timer(t)
  19 timer:set(1000)
  20
  21 -- timer example 2 (will run once)
  22 uloop.timer(function() print("2000 ms timer run"); end, 2000)
  23
  24 -- timer example 3 (will never run)
  25 uloop.timer(function() print("3000 ms timer run"); end, 3000):cancel()
  26
  27 -- periodic interval timer
  28 local intv
  29 intv = uloop.interval(function()
  30         print(string.format("Interval expiration #%d - %dms until next expiration",
  31                 intv:expirations(), intv:remaining()))
  32
  33         -- after 5 expirations, lower interval to 500ms
  34         if intv:expirations() >= 5 then
  35                 intv:set(500)
  36         end
  37
  38         -- cancel after 10 expirations
  39         if intv:expirations() >= 10 then
  40                 intv:cancel()
  41         end
  42 end, 1000)
  43
  44 -- process
  45 function p1(r)
  46         print("Process 1 completed")
  47         print(r)
  48 end
  49
  50 function p2(r)
  51         print("Process 2 completed")
  52         print(r)
  53 end
  54
  55 uloop.timer(
  56         function()
  57                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=1"}, p1)
  58         end, 1000
  59 )
  60 uloop.timer(
  61         function()
  62                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=2"}, p2)
  63         end, 2000
  64 )
  65
  66 -- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
  67 -- .delete will manually untrack.
  68 udp_ev = uloop.fd_add(udp, function(ufd, events)
  69         local words, msg_or_ip, port_or_nil = ufd:receivefrom()
  70         print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
  71         if words == "Stop!" then
  72                 udp_ev:delete()
  73         end
  74 end, uloop.ULOOP_READ)
  75
  76 udp_count = 0
  77 udp_send_timer = uloop.timer(
  78         function()
  79                 local s = socket.udp()
  80                 local words
  81                 if udp_count > 3 then
  82                         words = "Stop!"
  83                         udp_send_timer:cancel()
  84                 else
  85                         words = 'Hello!'
  86                         udp_send_timer:set(1000)
  87                 end
  88                 print('Send UDP packet to 127.0.0.1:8080 :'..words)
  89                 s:sendto(words, '127.0.0.1', 8080)
  90                 s:close()
  91
  92                 udp_count = udp_count + 1
  93         end, 3000
  94 )
  95
  96 uloop.run()
  97