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47efa93ea859
util/async.lua

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util/async.lua @ 13004:47efa93ea859

teal-src/README: Tweak markdown syntax
author Kim Alvefur <zash@zash.se>
date Tue, 28 Mar 2023 11:42:09 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local logger = require "prosody.util.logger";
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2 local log = logger.init("util.async");
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3 local new_id = require "prosody.util.id".short;
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4 local xpcall = require "prosody.util.xpcall".xpcall;
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5
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6 local function checkthread()
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7 local thread, main = coroutine.running();
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8 if not thread or main then
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9 error("Not running in an async context, see https://prosody.im/doc/developers/util/async");
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10 end
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11 return thread;
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12 end
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13
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14 -- Configurable functions
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15 local schedule_task = nil; -- schedule_task(seconds, callback)
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16 local next_tick = function (f)
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17 f();
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18 end
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19
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20 local function runner_from_thread(thread)
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21 local level = 0;
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22 -- Find the 'level' of the top-most function (0 == current level, 1 == caller, ...)
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23 while debug.getinfo(thread, level, "") do level = level + 1; end
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24 local name, runner = debug.getlocal(thread, level-1, 1);
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25 if name ~= "self" or type(runner) ~= "table" or runner.thread ~= thread then
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26 return nil;
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27 end
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28 return runner;
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29 end
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30
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31 local function call_watcher(runner, watcher_name, ...)
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32 local watcher = runner.watchers[watcher_name];
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33 if not watcher then
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34 return false;
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35 end
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36 runner:log("debug", "Calling '%s' watcher", watcher_name);
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37 local ok, err = xpcall(watcher, debug.traceback, runner, ...);
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38 if not ok then
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39 runner:log("error", "Error in '%s' watcher: %s", watcher_name, err);
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40 return nil, err;
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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 runner_continue(thread)
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46 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
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47 if coroutine.status(thread) ~= "suspended" then -- This should suffice
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48 log("error", "unexpected async state: thread not suspended");
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49 return false;
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50 end
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51 local ok, state, runner = coroutine.resume(thread);
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52 if not ok then
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53 local err = state;
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54 -- Running the coroutine failed, which means we have to find the runner manually,
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55 -- in order to inform the error handler
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56 runner = runner_from_thread(thread);
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57 if not runner then
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58 log("error", "unexpected async state: unable to locate runner during error handling");
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59 return false;
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60 end
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61 call_watcher(runner, "error", debug.traceback(thread, err));
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62 runner.state = "ready";
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63 return runner:run();
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64 elseif state == "ready" then
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65 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
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66 -- We also have to :run(), because the queue might have further items that will not be
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67 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
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68 next_tick(function ()
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69 runner.state = "ready";
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70 runner:run();
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71 end);
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72 end
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73 return true;
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74 end
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75
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76 local function waiter(num, allow_many)
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77 local thread = checkthread();
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78 num = num or 1;
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79 local waiting;
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80 return function ()
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81 if num == 0 then return; end -- already done
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82 waiting = true;
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83 coroutine.yield("wait");
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84 end, function ()
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85 num = num - 1;
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86 if num == 0 and waiting then
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87 runner_continue(thread);
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88 elseif not allow_many and num < 0 then
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89 error("done() called too many times");
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90 end
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91 end;
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92 end
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93
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94 local function guarder()
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95 local guards = {};
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96 local default_id = {};
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97 return function (id, func)
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98 id = id or default_id;
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99 local thread = checkthread();
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100 local guard = guards[id];
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101 if not guard then
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102 guard = {};
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103 guards[id] = guard;
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104 log("debug", "New guard!");
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105 else
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106 table.insert(guard, thread);
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107 log("debug", "Guarded. %d threads waiting.", #guard)
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108 coroutine.yield("wait");
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109 end
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110 local function exit()
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111 local next_waiting = table.remove(guard, 1);
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112 if next_waiting then
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113 log("debug", "guard: Executing next waiting thread (%d left)", #guard)
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114 runner_continue(next_waiting);
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115 else
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116 log("debug", "Guard off duty.")
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117 guards[id] = nil;
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118 end
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119 end
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120 if func then
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121 func();
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122 exit();
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123 return;
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124 end
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125 return exit;
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126 end;
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127 end
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128
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129 local function sleep(seconds)
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130 if not schedule_task then
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diff changeset
131 error("async.sleep() is not available - configure schedule function");
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132 end
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133 local wait, done = waiter();
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134 schedule_task(seconds, done);
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diff changeset
135 wait();
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136 end
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137
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138 local runner_mt = {};
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diff changeset
139 runner_mt.__index = runner_mt;
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140
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141 local function runner_create_thread(func, self)
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142 local thread = coroutine.create(function (self) -- luacheck: ignore 432/self
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143 while true do
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144 func(coroutine.yield("ready", self));
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145 end
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146 end);
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diff changeset
147 debug.sethook(thread, debug.gethook());
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148 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
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149 return thread;
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150 end
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diff changeset
151
8681
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152 local function default_error_watcher(runner, err)
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153 runner:log("error", "Encountered error: %s", err);
0c077800cd70 util.async: Make parameters to async.runner() optional
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154 error(err);
0c077800cd70 util.async: Make parameters to async.runner() optional
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155 end
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156 local function default_func(f) f(); end
5790
959163e4d631 util.async: Make functions local
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diff changeset
157 local function runner(func, watchers, data)
8788
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158 local id = new_id();
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159 local _log = logger.init("runner" .. id);
8681
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diff changeset
160 return setmetatable({ func = func or default_func, thread = false, state = "ready", notified_state = "ready",
8788
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diff changeset
161 queue = {}, watchers = watchers or { error = default_error_watcher }, data = data, id = id, _log = _log; }
5788
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diff changeset
162 , runner_mt);
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diff changeset
163 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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164
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165 -- Add a task item for the runner to process
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166 function runner_mt:run(input)
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167 if input ~= nil then
8602
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diff changeset
168 table.insert(self.queue, input);
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169 --self:log("debug", "queued new work item, %d items queued", #self.queue);
5788
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170 end
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diff changeset
171 if self.state ~= "ready" then
7436
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172 -- The runner is busy. Indicate that the task item has been
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173 -- queued, and return information about the current runner state
5788
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diff changeset
174 return true, self.state, #self.queue;
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diff changeset
175 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
176
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
177 local q, thread = self.queue, self.thread;
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diff changeset
178 if not thread or coroutine.status(thread) == "dead" then
10930
69a4b0e3565f util.async: Call coroutine.close() on dead threads (Lua 5.4)
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diff changeset
179 --luacheck: ignore 143/coroutine
10931
558f0555ba02 util.async: Don't attempt to close thread if not created yet
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diff changeset
180 if thread and coroutine.close then
10930
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diff changeset
181 coroutine.close(thread);
69a4b0e3565f util.async: Call coroutine.close() on dead threads (Lua 5.4)
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182 end
8600
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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diff changeset
183 self:log("debug", "creating new coroutine");
7436
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184 -- Create a new coroutine for this runner
5788
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185 thread = runner_create_thread(self.func, self);
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186 self.thread = thread;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
187 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
188
7436
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189 -- Process task item(s) while the queue is not empty, and we're not blocked
5788
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diff changeset
190 local n, state, err = #q, self.state, nil;
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diff changeset
191 self.state = "running";
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192 --self:log("debug", "running main loop");
8603
dc5f3302a642 util.async: Bugfix, don't continue main loop while there is a pending error
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diff changeset
193 while n > 0 and state == "ready" and not err do
5788
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parents:
diff changeset
194 local consumed;
7436
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195 -- Loop through queue items, and attempt to run them
5788
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diff changeset
196 for i = 1,n do
7724
20a69ef5570c util.async: Rename variable to avoid name clash [luacheck]
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diff changeset
197 local queued_input = q[i];
20a69ef5570c util.async: Rename variable to avoid name clash [luacheck]
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diff changeset
198 local ok, new_state = coroutine.resume(thread, queued_input);
5788
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diff changeset
199 if not ok then
7436
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200 -- There was an error running the coroutine, save the error, mark runner as ready to begin again
5788
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parents:
diff changeset
201 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
202 self.thread = nil;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
203 break;
5791
2c98061b6b1e util.async: runner: Fix check for new state to recognise transition to 'waiting'
Matthew Wild <mwild1@gmail.com>
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diff changeset
204 elseif new_state == "wait" then
7436
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diff changeset
205 -- Runner is blocked on waiting for a task item to complete
5788
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parents:
diff changeset
206 consumed, state = i, "waiting";
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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diff changeset
207 break;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
208 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
209 end
7436
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210 -- Loop ended - either queue empty because all tasks passed without blocking (consumed == nil)
649b89b2c840 util.async: Add some more comments for clarity
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diff changeset
211 -- or runner is blocked/errored, and consumed will contain the number of tasks processed so far
5788
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parents:
diff changeset
212 if not consumed then consumed = n; end
7436
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diff changeset
213 -- Remove consumed items from the queue array
5788
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parents:
diff changeset
214 if q[n+1] ~= nil then
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
215 n = #q;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
216 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
217 for i = 1, n do
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
218 q[i] = q[consumed+i];
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
219 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
220 n = #q;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
221 end
7436
649b89b2c840 util.async: Add some more comments for clarity
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diff changeset
222 -- Runner processed all items it can, so save current runner state
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
223 self.state = state;
5794
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
parents: 5793
diff changeset
224 if err or state ~= self.notified_state then
8604
1c8c7fd259c8 util.async: Log the non-error state as well when there is an error being processed
Matthew Wild <mwild1@gmail.com>
parents: 8603
diff changeset
225 self:log("debug", "changed state from %s to %s", self.notified_state, err and ("error ("..state..")") or state);
5794
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
parents: 5793
diff changeset
226 if err then
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
parents: 5793
diff changeset
227 state = "error"
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
parents: 5793
diff changeset
228 else
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
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diff changeset
229 self.notified_state = state;
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
Matthew Wild <mwild1@gmail.com>
parents: 5793
diff changeset
230 end
5788
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parents:
diff changeset
231 local handler = self.watchers[state];
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
232 if handler then handler(self, err); end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
233 end
8615
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
Matthew Wild <mwild1@gmail.com>
parents: 8613
diff changeset
234 if n > 0 then
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
Matthew Wild <mwild1@gmail.com>
parents: 8613
diff changeset
235 return self:run();
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
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parents: 8613
diff changeset
236 end
5788
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parents:
diff changeset
237 return true, state, n;
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
238 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
239
7436
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diff changeset
240 -- Add a task item to the queue without invoking the runner, even if it is idle
5788
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parents:
diff changeset
241 function runner_mt:enqueue(input)
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
242 table.insert(self.queue, input);
8602
9901deadc068 util.async: Fix order of statements so queue count makes more sense
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parents: 8601
diff changeset
243 self:log("debug", "queued new work item, %d items queued", #self.queue);
8766
01264bc60c2b util.async: Add helper methods for setting watchers
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parents: 8685
diff changeset
244 return self;
5788
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
245 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
246
8600
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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parents: 8408
diff changeset
247 function runner_mt:log(level, fmt, ...)
8788
7a9b680a79fb util.async: Move runner id into log tag
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parents: 8766
diff changeset
248 return self._log(level, fmt, ...);
8600
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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parents: 8408
diff changeset
249 end
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
Matthew Wild <mwild1@gmail.com>
parents: 8408
diff changeset
250
8766
01264bc60c2b util.async: Add helper methods for setting watchers
Matthew Wild <mwild1@gmail.com>
parents: 8685
diff changeset
251 function runner_mt:onready(f)
01264bc60c2b util.async: Add helper methods for setting watchers
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parents: 8685
diff changeset
252 self.watchers.ready = f;
01264bc60c2b util.async: Add helper methods for setting watchers
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parents: 8685
diff changeset
253 return self;
01264bc60c2b util.async: Add helper methods for setting watchers
Matthew Wild <mwild1@gmail.com>
parents: 8685
diff changeset
254 end
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
255
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
256 function runner_mt:onwaiting(f)
01264bc60c2b util.async: Add helper methods for setting watchers
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parents: 8685
diff changeset
257 self.watchers.waiting = f;
01264bc60c2b util.async: Add helper methods for setting watchers
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parents: 8685
diff changeset
258 return self;
01264bc60c2b util.async: Add helper methods for setting watchers
Matthew Wild <mwild1@gmail.com>
parents: 8685
diff changeset
259 end
01264bc60c2b util.async: Add helper methods for setting watchers
Matthew Wild <mwild1@gmail.com>
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260
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261 function runner_mt:onerror(f)
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262 self.watchers.error = f;
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263 return self;
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264 end
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265
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266 local function ready()
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267 return pcall(checkthread);
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268 end
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269
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270 local function wait_for(promise)
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271 local async_wait, async_done = waiter();
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272 local ret, err = nil, nil;
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273 promise:next(
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274 function (r) ret = r; end,
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275 function (e) err = e; end)
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276 :finally(async_done);
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277 async_wait();
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278 if ret then
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279 return ret;
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280 else
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281 return nil, err;
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282 end
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283 end
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284
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285 return {
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286 ready = ready;
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287 waiter = waiter;
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288 guarder = guarder;
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289 runner = runner;
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290 wait = wait_for; -- COMPAT w/trunk pre-0.12
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291 wait_for = wait_for;
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292 sleep = sleep;
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293
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294 set_nexttick = function(new_next_tick) next_tick = new_next_tick; end;
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295 set_schedule_function = function (new_schedule_function) schedule_task = new_schedule_function; end;
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296 };