prosody
a6a587df3b0e
util/timer.lua

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util/timer.lua @ 8801:a6a587df3b0e

.luacheckrc: Add some additional stricter requirements when PROSODY_STRICT_LINT=1
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 May 2018 15:02:00 +0100
parent 8762:2f8523bf7ff2
child 8995:2e6f7ab97794
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rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local indexedbheap = require "util.indexedbheap";
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10 local log = require "util.logger".init("timer");
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11 local server = require "net.server";
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12 local get_time = require "util.time".now
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13 local async = require "util.async";
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14 local type = type;
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15 local debug_traceback = debug.traceback;
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16 local tostring = tostring;
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17 local xpcall = xpcall;
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18 local math_max = math.max;
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20 local _ENV = nil;
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21 -- luacheck: std none
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22
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23 local _add_task = server.add_task;
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24
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25 local _server_timer;
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26 local _active_timers = 0;
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27 local h = indexedbheap.create();
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28 local params = {};
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29 local next_time = nil;
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30 local _id, _callback, _now, _param;
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31 local function _call() return _callback(_now, _id, _param); end
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32 local function _traceback_handler(err) log("error", "Traceback[timer]: %s", debug_traceback(tostring(err), 2)); end
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33 local function _on_timer(now)
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34 local peek;
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35 while true do
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36 peek = h:peek();
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37 if peek == nil or peek > now then break; end
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38 local _;
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39 _, _callback, _id = h:pop();
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40 _now = now;
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41 _param = params[_id];
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42 params[_id] = nil;
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43 --item(now, id, _param); -- FIXME pcall
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44 local success, err = xpcall(_call, _traceback_handler);
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45 if success and type(err) == "number" then
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46 h:insert(_callback, err + now, _id); -- re-add
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47 params[_id] = _param;
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48 end
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49 end
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50
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51 if peek ~= nil and _active_timers > 1 and peek == next_time then
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52 -- Another instance of _on_timer already set next_time to the same value,
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53 -- so it should be safe to not renew this timer event
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54 peek = nil;
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55 else
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56 next_time = peek;
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57 end
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58
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59 if peek then
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60 -- peek is the time of the next event
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61 return peek - now;
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62 end
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63 _active_timers = _active_timers - 1;
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64 end
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65 local function add_task(delay, callback, param)
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66 local current_time = get_time();
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67 local event_time = current_time + delay;
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68
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69 local id = h:insert(callback, event_time);
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70 params[id] = param;
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71 if next_time == nil or event_time < next_time then
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72 next_time = event_time;
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73 if _server_timer then
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74 _server_timer:close();
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75 _server_timer = nil;
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76 else
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77 _active_timers = _active_timers + 1;
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78 end
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79 _server_timer = _add_task(next_time - current_time, _on_timer);
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80 end
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81 return id;
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82 end
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83 local function stop(id)
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84 params[id] = nil;
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85 local result, item, result_sync = h:remove(id);
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86 local peek = h:peek();
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87 if peek ~= next_time and _server_timer then
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88 next_time = peek;
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89 _server_timer:close();
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90 if next_time ~= nil then
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91 _server_timer = _add_task(math_max(next_time - get_time(), 0), _on_timer);
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92 end
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93 end
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94 return result, item, result_sync;
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95 end
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96 local function reschedule(id, delay)
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97 local current_time = get_time();
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98 local event_time = current_time + delay;
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99 h:reprioritize(id, delay);
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parents: 5776
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100 if next_time == nil or event_time < next_time then
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parents: 5776
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101 next_time = event_time;
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102 _add_task(next_time - current_time, _on_timer);
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103 end
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Waqas Hussain <waqas20@gmail.com>
parents: 5776
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104 return id;
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105 end
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parents:
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106
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Kim Alvefur <zash@zash.se>
parents: 8555
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107 local function sleep(s)
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108 local wait, done = async.waiter();
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109 add_task(s, done);
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110 wait();
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111 end
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112
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113 return {
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114 add_task = add_task;
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115 stop = stop;
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116 reschedule = reschedule;
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parents: 8555
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117 sleep = sleep;
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118 };
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119