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util/async.lua

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util/async.lua @ 5797:a493b79cfad0

util.async: Make guarder() local
author Matthew Wild <mwild1@gmail.com>
date Tue, 13 Aug 2013 23:38:50 +0100
parent 5796:0b66cb959161
child 7359:a5a080c12c96
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1 local log = require "util.logger".init("util.async");
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2
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3 local function runner_continue(thread)
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4 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
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5 if coroutine.status(thread) ~= "suspended" then -- This should suffice
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6 return false;
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7 end
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8 local ok, state, runner = coroutine.resume(thread);
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9 if not ok then
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10 local level = 0;
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11 while debug.getinfo(thread, level, "") do level = level + 1; end
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12 ok, runner = debug.getlocal(thread, level-1, 1);
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13 local error_handler = runner.watchers.error;
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14 if error_handler then error_handler(runner, debug.traceback(thread, state)); end
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15 elseif state == "ready" then
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16 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
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17 -- We also have to :run(), because the queue might have further items that will not be
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18 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
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19 runner.state = "ready";
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20 runner:run();
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21 end
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22 return true;
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23 end
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24
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25 local function waiter(num)
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26 local thread = coroutine.running();
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27 if not thread then
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28 error("Not running in an async context, see http://prosody.im/doc/developers/async");
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29 end
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30 num = num or 1;
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31 local waiting;
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32 return function ()
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33 if num == 0 then return; end -- already done
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34 waiting = true;
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35 coroutine.yield("wait");
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36 end, function ()
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37 num = num - 1;
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38 if num == 0 and waiting then
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39 runner_continue(thread);
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40 elseif num < 0 then
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41 error("done() called too many times");
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42 end
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43 end;
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44 end
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45
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46 local function guarder()
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47 local guards = {};
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48 return function (id, func)
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49 local thread = coroutine.running();
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50 if not thread then
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51 error("Not running in an async context, see http://prosody.im/doc/developers/async");
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52 end
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53 local guard = guards[id];
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54 if not guard then
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55 guard = {};
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56 guards[id] = guard;
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57 log("debug", "New guard!");
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58 else
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59 table.insert(guard, thread);
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60 log("debug", "Guarded. %d threads waiting.", #guard)
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61 coroutine.yield("wait");
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62 end
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63 local function exit()
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64 local next_waiting = table.remove(guard, 1);
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65 if next_waiting then
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66 log("debug", "guard: Executing next waiting thread (%d left)", #guard)
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67 runner_continue(next_waiting);
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68 else
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69 log("debug", "Guard off duty.")
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70 guards[id] = nil;
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71 end
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72 end
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73 if func then
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74 func();
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75 exit();
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76 return;
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77 end
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78 return exit;
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79 end;
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80 end
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81
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82 local runner_mt = {};
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83 runner_mt.__index = runner_mt;
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84
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85 local function runner_create_thread(func, self)
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86 local thread = coroutine.create(function (self)
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87 while true do
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88 func(coroutine.yield("ready", self));
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89 end
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90 end);
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91 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
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92 return thread;
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93 end
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94
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95 local empty_watchers = {};
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96 local function runner(func, watchers, data)
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97 return setmetatable({ func = func, thread = false, state = "ready", notified_state = "ready",
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98 queue = {}, watchers = watchers or empty_watchers, data = data }
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99 , runner_mt);
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100 end
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101
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102 function runner_mt:run(input)
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103 if input ~= nil then
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104 table.insert(self.queue, input);
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105 end
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106 if self.state ~= "ready" then
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107 return true, self.state, #self.queue;
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108 end
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109
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110 local q, thread = self.queue, self.thread;
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111 if not thread or coroutine.status(thread) == "dead" then
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112 thread = runner_create_thread(self.func, self);
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113 self.thread = thread;
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114 end
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115
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116 local n, state, err = #q, self.state, nil;
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117 self.state = "running";
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118 while n > 0 and state == "ready" do
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119 local consumed;
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120 for i = 1,n do
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121 local input = q[i];
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122 local ok, new_state = coroutine.resume(thread, input);
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123 if not ok then
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124 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
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125 self.thread = nil;
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126 break;
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127 elseif new_state == "wait" then
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128 consumed, state = i, "waiting";
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129 break;
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130 end
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131 end
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132 if not consumed then consumed = n; end
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133 if q[n+1] ~= nil then
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134 n = #q;
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135 end
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136 for i = 1, n do
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137 q[i] = q[consumed+i];
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138 end
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139 n = #q;
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140 end
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141 self.state = state;
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142 if err or state ~= self.notified_state then
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143 if err then
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144 state = "error"
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145 else
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146 self.notified_state = state;
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147 end
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148 local handler = self.watchers[state];
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149 if handler then handler(self, err); end
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150 end
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151 return true, state, n;
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152 end
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153
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154 function runner_mt:enqueue(input)
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155 table.insert(self.queue, input);
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156 end
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157
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158 return { waiter = waiter, guarder = guarder, runner = runner };