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937de0c39279
util/async.lua

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util/async.lua @ 8611:937de0c39279

util.async: Add comment
author Matthew Wild <mwild1@gmail.com>
date Fri, 16 Mar 2018 22:31:12 +0000
parent 8610:b03c7884fade
child 8613:dbb4788db8e3
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1 local log = require "util.logger".init("util.async");
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2 local new_id = require "util.id".short;
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3
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4 local function checkthread()
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5 local thread, main = coroutine.running();
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6 if not thread or main then
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7 error("Not running in an async context, see https://prosody.im/doc/developers/util/async");
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8 end
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9 return thread;
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10 end
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11
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12 local function runner_continue(thread)
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13 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
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14 if coroutine.status(thread) ~= "suspended" then -- This should suffice
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15 log("warn", "unexpected async state: thread not suspended");
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16 return false;
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17 end
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18 local ok, state, runner = coroutine.resume(thread);
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19 if not ok then
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20 local err = state;
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21 -- Running the coroutine failed, which means we have to find the runner manually,
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22 -- in order to inform the error handler
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23 local level = 0;
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24 -- Find the 'level' of the top-most function (0 == current level, 1 == caller, ...)
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25 while debug.getinfo(thread, level, "") do level = level + 1; end
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26 ok, runner = debug.getlocal(thread, level-1, 1);
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27 assert(ok == "self", "unexpected async state: variable mismatch");
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28 assert(runner.thread == thread, "unexpected async state: thread mismatch");
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29 local error_handler = runner.watchers.error;
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30 if error_handler then error_handler(runner, debug.traceback(thread, err)); end
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31 local ready_handler = runner.watchers.ready;
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32 runner.state, runner.thread = "ready", nil;
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33 if ready_handler then ready_handler(runner); end
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34 runner.notified_state = "ready";
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35 elseif state == "ready" then
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36 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
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37 -- We also have to :run(), because the queue might have further items that will not be
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38 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
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39 runner.state = "ready";
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40 runner:run();
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41 end
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42 return true;
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43 end
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44
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45 local function waiter(num)
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46 local thread = checkthread();
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47 num = num or 1;
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48 local waiting;
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49 return function ()
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50 if num == 0 then return; end -- already done
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51 waiting = true;
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52 coroutine.yield("wait");
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53 end, function ()
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54 num = num - 1;
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55 if num == 0 and waiting then
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56 runner_continue(thread);
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57 elseif num < 0 then
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58 error("done() called too many times");
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59 end
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60 end;
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61 end
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62
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63 local function guarder()
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64 local guards = {};
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65 return function (id, func)
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66 local thread = checkthread();
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67 local guard = guards[id];
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68 if not guard then
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69 guard = {};
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70 guards[id] = guard;
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71 log("debug", "New guard!");
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72 else
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73 table.insert(guard, thread);
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74 log("debug", "Guarded. %d threads waiting.", #guard)
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75 coroutine.yield("wait");
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76 end
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77 local function exit()
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78 local next_waiting = table.remove(guard, 1);
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79 if next_waiting then
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80 log("debug", "guard: Executing next waiting thread (%d left)", #guard)
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81 runner_continue(next_waiting);
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82 else
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83 log("debug", "Guard off duty.")
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84 guards[id] = nil;
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85 end
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86 end
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87 if func then
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88 func();
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89 exit();
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90 return;
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91 end
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92 return exit;
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93 end;
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94 end
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95
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96 local runner_mt = {};
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97 runner_mt.__index = runner_mt;
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98
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99 local function runner_create_thread(func, self)
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100 local thread = coroutine.create(function (self) -- luacheck: ignore 432/self
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101 while true do
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102 func(coroutine.yield("ready", self));
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103 end
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104 end);
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105 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
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106 return thread;
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107 end
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108
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109 local empty_watchers = {};
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110 local function runner(func, watchers, data)
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111 return setmetatable({ func = func, thread = false, state = "ready", notified_state = "ready",
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112 queue = {}, watchers = watchers or empty_watchers, data = data, id = new_id() }
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113 , runner_mt);
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114 end
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115
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116 -- Add a task item for the runner to process
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117 function runner_mt:run(input)
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118 if input ~= nil then
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119 table.insert(self.queue, input);
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120 self:log("debug", "queued new work item, %d items queued", #self.queue);
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121 end
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122 if self.state ~= "ready" then
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123 -- The runner is busy. Indicate that the task item has been
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124 -- queued, and return information about the current runner state
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125 return true, self.state, #self.queue;
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126 end
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127
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128 local q, thread = self.queue, self.thread;
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129 if not thread or coroutine.status(thread) == "dead" then
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130 self:log("debug", "creating new coroutine");
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131 -- Create a new coroutine for this runner
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132 thread = runner_create_thread(self.func, self);
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133 self.thread = thread;
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134 end
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135
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136 -- Process task item(s) while the queue is not empty, and we're not blocked
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137 local n, state, err = #q, self.state, nil;
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138 self.state = "running";
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139 self:log("debug", "running main loop");
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140 while n > 0 and state == "ready" and not err do
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141 local consumed;
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142 -- Loop through queue items, and attempt to run them
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143 for i = 1,n do
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144 local queued_input = q[i];
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145 local ok, new_state = coroutine.resume(thread, queued_input);
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146 if not ok then
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147 -- There was an error running the coroutine, save the error, mark runner as ready to begin again
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148 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
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149 self.thread = nil;
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150 break;
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151 elseif new_state == "wait" then
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152 -- Runner is blocked on waiting for a task item to complete
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153 consumed, state = i, "waiting";
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154 break;
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155 end
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156 end
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157 -- Loop ended - either queue empty because all tasks passed without blocking (consumed == nil)
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158 -- or runner is blocked/errored, and consumed will contain the number of tasks processed so far
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159 if not consumed then consumed = n; end
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160 -- Remove consumed items from the queue array
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161 if q[n+1] ~= nil then
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162 n = #q;
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163 end
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164 for i = 1, n do
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165 q[i] = q[consumed+i];
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166 end
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167 n = #q;
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168 end
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169 -- Runner processed all items it can, so save current runner state
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170 self.state = state;
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171 if err or state ~= self.notified_state then
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172 self:log("debug", "changed state from %s to %s", self.notified_state, err and ("error ("..state..")") or state);
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173 if err then
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174 state = "error"
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175 else
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176 self.notified_state = state;
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177 end
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178 local handler = self.watchers[state];
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179 if handler then handler(self, err); end
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180 end
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181 return true, state, n;
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182 end
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183
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184 -- Add a task item to the queue without invoking the runner, even if it is idle
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185 function runner_mt:enqueue(input)
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186 table.insert(self.queue, input);
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187 self:log("debug", "queued new work item, %d items queued", #self.queue);
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188 end
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189
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190 function runner_mt:log(level, fmt, ...)
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191 return log(level, "[runner %s] "..fmt, self.id, ...);
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192 end
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193
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194 return { waiter = waiter, guarder = guarder, runner = runner };