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 -- process
  28 function p1(r)
  29         print("Process 1 completed")
  30         print(r)
  31 end
  32
  33 function p2(r)
  34         print("Process 2 completed")
  35         print(r)
  36 end
  37
  38 uloop.timer(
  39         function()
  40                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=1"}, p1)
  41         end, 1000
  42 )
  43 uloop.timer(
  44         function()
  45                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=2"}, p2)
  46         end, 2000
  47 )
  48
  49 -- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
  50 -- .delete will manually untrack.
  51 udp_ev = uloop.fd_add(udp, function(ufd, events)
  52         local words, msg_or_ip, port_or_nil = ufd:receivefrom()
  53         print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
  54         if words == "Stop!" then
  55                 udp_ev:delete()
  56         end
  57 end, uloop.ULOOP_READ)
  58
  59 udp_count = 0
  60 udp_send_timer = uloop.timer(
  61         function()
  62                 local s = socket.udp()
  63                 local words
  64                 if udp_count > 3 then
  65                         words = "Stop!"
  66                         udp_send_timer:cancel()
  67                 else
  68                         words = 'Hello!'
  69                         udp_send_timer:set(1000)
  70                 end
  71                 print('Send UDP packet to 127.0.0.1:8080 :'..words)
  72                 s:sendto(words, '127.0.0.1', 8080)
  73                 s:close()
  74
  75                 udp_count = udp_count + 1
  76         end, 3000
  77 )
  78
  79 uloop.run()
  80