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Sources/libubox/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 -- SIGINT handler
67 uloop.signal(function(signo)
68 print(string.format("Terminating on SIGINT (#%d)!", signo))
69
70 -- end uloop to terminate program
71 uloop.cancel()
72 end, uloop.SIGINT)
73
74 local sig
75 sig = uloop.signal(function(signo)
76 print(string.format("Got SIGUSR2 (#%d)!", signo))
77
78 -- remove signal handler, next SIGUSR2 will terminate program
79 sig:delete()
80 end, uloop.SIGUSR2)
81
82 -- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
83 -- .delete will manually untrack.
84 udp_ev = uloop.fd_add(udp, function(ufd, events)
85 local words, msg_or_ip, port_or_nil = ufd:receivefrom()
86 print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
87 if words == "Stop!" then
88 udp_ev:delete()
89 end
90 end, uloop.ULOOP_READ)
91
92 udp_count = 0
93 udp_send_timer = uloop.timer(
94 function()
95 local s = socket.udp()
96 local words
97 if udp_count > 3 then
98 words = "Stop!"
99 udp_send_timer:cancel()
100 else
101 words = 'Hello!'
102 udp_send_timer:set(1000)
103 end
104 print('Send UDP packet to 127.0.0.1:8080 :'..words)
105 s:sendto(words, '127.0.0.1', 8080)
106 s:close()
107
108 udp_count = udp_count + 1
109 end, 3000
110 )
111
112 uloop.run()
113
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