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ca710a71d730
util/async.lua

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util/async.lua @ 8648:ca710a71d730

util.async: Add ready() to check whether running in async context
author Matthew Wild <mwild1@gmail.com>
date Thu, 22 Mar 2018 07:46:23 +0000
parent 8629:ddb04cacb8b1
child 8649:9246f64d6f1e
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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_from_thread(thread)
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13 local level = 0;
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14 -- Find the 'level' of the top-most function (0 == current level, 1 == caller, ...)
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15 while debug.getinfo(thread, level, "") do level = level + 1; end
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16 local name, runner = debug.getlocal(thread, level-1, 1);
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17 if name ~= "self" or type(runner) ~= "table" or runner.thread ~= thread then
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18 return nil;
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19 end
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20 return runner;
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21 end
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22
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23 local function call_watcher(runner, watcher_name, ...)
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24 local watcher = runner.watchers[watcher_name];
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25 if not watcher then
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26 return false;
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27 end
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28 runner:log("debug", "Calling '%s' watcher", watcher_name);
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29 local ok, err = pcall(watcher, runner, ...); -- COMPAT: Switch to xpcall after Lua 5.1
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30 if not ok then
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31 runner:log("error", "Error in '%s' watcher: %s", watcher_name, err);
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32 return nil, err;
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33 end
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34 return true;
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35 end
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36
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37 local function runner_continue(thread)
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38 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
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39 if coroutine.status(thread) ~= "suspended" then -- This should suffice
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40 log("error", "unexpected async state: thread not suspended");
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41 return false;
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42 end
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43 local ok, state, runner = coroutine.resume(thread);
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44 if not ok then
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45 local err = state;
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46 -- Running the coroutine failed, which means we have to find the runner manually,
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47 -- in order to inform the error handler
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48 runner = runner_from_thread(thread);
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49 if not runner then
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50 log("error", "unexpected async state: unable to locate runner during error handling");
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51 return false;
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52 end
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53 call_watcher(runner, "error", debug.traceback(thread, err));
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54 runner.state, runner.thread = "ready", nil;
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55 return runner:run();
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56 elseif state == "ready" then
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57 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
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58 -- We also have to :run(), because the queue might have further items that will not be
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59 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
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60 runner.state = "ready";
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61 runner:run();
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62 end
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63 return true;
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64 end
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65
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66 local function waiter(num)
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67 local thread = checkthread();
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68 num = num or 1;
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69 local waiting;
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70 return function ()
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71 if num == 0 then return; end -- already done
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72 waiting = true;
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73 coroutine.yield("wait");
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74 end, function ()
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75 num = num - 1;
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76 if num == 0 and waiting then
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77 runner_continue(thread);
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78 elseif num < 0 then
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79 error("done() called too many times");
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80 end
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81 end;
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82 end
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83
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84 local function guarder()
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85 local guards = {};
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86 return function (id, func)
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87 local thread = checkthread();
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88 local guard = guards[id];
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89 if not guard then
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90 guard = {};
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91 guards[id] = guard;
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92 log("debug", "New guard!");
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93 else
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94 table.insert(guard, thread);
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95 log("debug", "Guarded. %d threads waiting.", #guard)
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96 coroutine.yield("wait");
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97 end
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98 local function exit()
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99 local next_waiting = table.remove(guard, 1);
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100 if next_waiting then
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101 log("debug", "guard: Executing next waiting thread (%d left)", #guard)
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102 runner_continue(next_waiting);
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103 else
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104 log("debug", "Guard off duty.")
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105 guards[id] = nil;
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106 end
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107 end
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108 if func then
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109 func();
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110 exit();
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111 return;
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112 end
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113 return exit;
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114 end;
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115 end
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116
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117 local runner_mt = {};
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118 runner_mt.__index = runner_mt;
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119
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120 local function runner_create_thread(func, self)
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121 local thread = coroutine.create(function (self) -- luacheck: ignore 432/self
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122 while true do
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123 func(coroutine.yield("ready", self));
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124 end
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125 end);
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126 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
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127 return thread;
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128 end
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129
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130 local empty_watchers = {};
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131 local function runner(func, watchers, data)
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132 return setmetatable({ func = func, thread = false, state = "ready", notified_state = "ready",
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133 queue = {}, watchers = watchers or empty_watchers, data = data, id = new_id() }
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134 , runner_mt);
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135 end
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136
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137 -- Add a task item for the runner to process
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138 function runner_mt:run(input)
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139 if input ~= nil then
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140 table.insert(self.queue, input);
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141 self:log("debug", "queued new work item, %d items queued", #self.queue);
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142 end
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143 if self.state ~= "ready" then
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144 -- The runner is busy. Indicate that the task item has been
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145 -- queued, and return information about the current runner state
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146 return true, self.state, #self.queue;
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147 end
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148
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149 local q, thread = self.queue, self.thread;
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150 if not thread or coroutine.status(thread) == "dead" then
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151 self:log("debug", "creating new coroutine");
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152 -- Create a new coroutine for this runner
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153 thread = runner_create_thread(self.func, self);
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154 self.thread = thread;
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155 end
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156
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157 -- Process task item(s) while the queue is not empty, and we're not blocked
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158 local n, state, err = #q, self.state, nil;
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159 self.state = "running";
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160 self:log("debug", "running main loop");
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161 while n > 0 and state == "ready" and not err do
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162 local consumed;
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163 -- Loop through queue items, and attempt to run them
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164 for i = 1,n do
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165 local queued_input = q[i];
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166 local ok, new_state = coroutine.resume(thread, queued_input);
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167 if not ok then
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168 -- There was an error running the coroutine, save the error, mark runner as ready to begin again
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169 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
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170 self.thread = nil;
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171 break;
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172 elseif new_state == "wait" then
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173 -- Runner is blocked on waiting for a task item to complete
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174 consumed, state = i, "waiting";
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175 break;
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176 end
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177 end
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178 -- Loop ended - either queue empty because all tasks passed without blocking (consumed == nil)
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179 -- or runner is blocked/errored, and consumed will contain the number of tasks processed so far
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180 if not consumed then consumed = n; end
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181 -- Remove consumed items from the queue array
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182 if q[n+1] ~= nil then
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183 n = #q;
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184 end
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185 for i = 1, n do
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186 q[i] = q[consumed+i];
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187 end
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188 n = #q;
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189 end
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190 -- Runner processed all items it can, so save current runner state
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191 self.state = state;
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192 if err or state ~= self.notified_state then
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193 self:log("debug", "changed state from %s to %s", self.notified_state, err and ("error ("..state..")") or state);
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194 if err then
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195 state = "error"
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196 else
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197 self.notified_state = state;
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198 end
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199 local handler = self.watchers[state];
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200 if handler then handler(self, err); end
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201 end
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202 if n > 0 then
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203 return self:run();
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204 end
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205 return true, state, n;
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206 end
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207
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208 -- Add a task item to the queue without invoking the runner, even if it is idle
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209 function runner_mt:enqueue(input)
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210 table.insert(self.queue, input);
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211 self:log("debug", "queued new work item, %d items queued", #self.queue);
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212 end
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213
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214 function runner_mt:log(level, fmt, ...)
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215 return log(level, "[runner %s] "..fmt, self.id, ...);
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216 end
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217
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218 local function ready()
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219 return pcall(checkthread);
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220 end
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221
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222 return { ready = ready, waiter = waiter, guarder = guarder, runner = runner };