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b30455212f89
util/async.lua

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util/async.lua @ 9539:b30455212f89

util.pubsub: Clarify comment about return value
author Kim Alvefur <zash@zash.se>
date Sun, 21 Oct 2018 22:21:18 +0200
parent 9177:83e7ad5818d3
child 9562:acf74ad0b795
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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7a9b680a79fb util.async: Move runner id into log tag
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1 local logger = require "util.logger";
7a9b680a79fb util.async: Move runner id into log tag
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2 local log = logger.init("util.async");
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96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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3 local new_id = require "util.id".short;
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4
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f652e1ea2f69 util.async: Factor out thread check into a function
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5 local function checkthread()
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b751bee6a829 util.async: Fix thread check to work correctly in Lua 5.2
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6 local thread, main = coroutine.running();
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7 if not thread or main then
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8 error("Not running in an async context, see https://prosody.im/doc/developers/util/async");
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9 end
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10 return thread;
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11 end
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12
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24b59a62acce util.async: Split runner_continue into smaller functions for easier testing and safety
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13 local function runner_from_thread(thread)
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14 local level = 0;
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15 -- Find the 'level' of the top-most function (0 == current level, 1 == caller, ...)
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16 while debug.getinfo(thread, level, "") do level = level + 1; end
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17 local name, runner = debug.getlocal(thread, level-1, 1);
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18 if name ~= "self" or type(runner) ~= "table" or runner.thread ~= thread then
24b59a62acce util.async: Split runner_continue into smaller functions for easier testing and safety
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19 return nil;
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20 end
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21 return runner;
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22 end
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23
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24 local function call_watcher(runner, watcher_name, ...)
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25 local watcher = runner.watchers[watcher_name];
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26 if not watcher then
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27 return false;
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28 end
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29 runner:log("debug", "Calling '%s' watcher", watcher_name);
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30 local ok, err = pcall(watcher, runner, ...); -- COMPAT: Switch to xpcall after Lua 5.1
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31 if not ok then
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32 runner:log("error", "Error in '%s' watcher: %s", watcher_name, err);
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33 return nil, err;
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34 end
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35 return true;
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36 end
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37
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38 local function runner_continue(thread)
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39 -- ASSUMPTION: runner is in 'waiting' state (but we don't have the runner to know for sure)
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40 if coroutine.status(thread) ~= "suspended" then -- This should suffice
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ddb04cacb8b1 util.async: Bump log warnings to error level
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41 log("error", "unexpected async state: thread not suspended");
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42 return false;
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43 end
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44 local ok, state, runner = coroutine.resume(thread);
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45 if not ok then
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9f6ab206d741 util.async: Ensure runner is left in correct state after out-of-main-loop error (+tests)
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46 local err = state;
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649b89b2c840 util.async: Add some more comments for clarity
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47 -- Running the coroutine failed, which means we have to find the runner manually,
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48 -- in order to inform the error handler
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49 runner = runner_from_thread(thread);
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50 if not runner then
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51 log("error", "unexpected async state: unable to locate runner during error handling");
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52 return false;
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53 end
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54 call_watcher(runner, "error", debug.traceback(thread, err));
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55 runner.state, runner.thread = "ready", nil;
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56 return runner:run();
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57 elseif state == "ready" then
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58 -- If state is 'ready', it is our responsibility to update runner.state from 'waiting'.
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59 -- We also have to :run(), because the queue might have further items that will not be
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60 -- processed otherwise. FIXME: It's probably best to do this in a nexttick (0 timer).
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61 runner.state = "ready";
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62 runner:run();
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63 end
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64 return true;
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65 end
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66
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67 local function waiter(num)
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68 local thread = checkthread();
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69 num = num or 1;
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70 local waiting;
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71 return function ()
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72 if num == 0 then return; end -- already done
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73 waiting = true;
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74 coroutine.yield("wait");
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75 end, function ()
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76 num = num - 1;
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77 if num == 0 and waiting then
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78 runner_continue(thread);
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79 elseif num < 0 then
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80 error("done() called too many times");
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81 end
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82 end;
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83 end
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84
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85 local function guarder()
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86 local guards = {};
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87 local default_id = {};
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88 return function (id, func)
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89 id = id or default_id;
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90 local thread = checkthread();
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91 local guard = guards[id];
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92 if not guard then
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93 guard = {};
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94 guards[id] = guard;
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95 log("debug", "New guard!");
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96 else
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97 table.insert(guard, thread);
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98 log("debug", "Guarded. %d threads waiting.", #guard)
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99 coroutine.yield("wait");
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100 end
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101 local function exit()
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102 local next_waiting = table.remove(guard, 1);
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103 if next_waiting then
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104 log("debug", "guard: Executing next waiting thread (%d left)", #guard)
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105 runner_continue(next_waiting);
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106 else
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107 log("debug", "Guard off duty.")
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108 guards[id] = nil;
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109 end
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110 end
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111 if func then
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112 func();
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113 exit();
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114 return;
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115 end
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116 return exit;
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117 end;
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118 end
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119
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120 local runner_mt = {};
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121 runner_mt.__index = runner_mt;
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122
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123 local function runner_create_thread(func, self)
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124 local thread = coroutine.create(function (self) -- luacheck: ignore 432/self
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125 while true do
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126 func(coroutine.yield("ready", self));
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127 end
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128 end);
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129 debug.sethook(thread, debug.gethook());
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130 assert(coroutine.resume(thread, self)); -- Start it up, it will return instantly to wait for the first input
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131 return thread;
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132 end
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133
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134 local function default_error_watcher(runner, err)
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135 runner:log("error", "Encountered error: %s", err);
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136 error(err);
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137 end
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138 local function default_func(f) f(); end
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139 local function runner(func, watchers, data)
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140 local id = new_id();
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141 local _log = logger.init("runner" .. id);
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142 return setmetatable({ func = func or default_func, thread = false, state = "ready", notified_state = "ready",
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143 queue = {}, watchers = watchers or { error = default_error_watcher }, data = data, id = id, _log = _log; }
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144 , runner_mt);
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145 end
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146
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147 -- Add a task item for the runner to process
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148 function runner_mt:run(input)
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149 if input ~= nil then
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150 table.insert(self.queue, input);
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151 --self:log("debug", "queued new work item, %d items queued", #self.queue);
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152 end
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153 if self.state ~= "ready" then
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154 -- The runner is busy. Indicate that the task item has been
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155 -- queued, and return information about the current runner state
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156 return true, self.state, #self.queue;
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157 end
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158
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159 local q, thread = self.queue, self.thread;
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160 if not thread or coroutine.status(thread) == "dead" then
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161 self:log("debug", "creating new coroutine");
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162 -- Create a new coroutine for this runner
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163 thread = runner_create_thread(self.func, self);
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164 self.thread = thread;
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165 end
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166
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167 -- Process task item(s) while the queue is not empty, and we're not blocked
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168 local n, state, err = #q, self.state, nil;
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169 self.state = "running";
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170 --self:log("debug", "running main loop");
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171 while n > 0 and state == "ready" and not err do
5788
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172 local consumed;
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173 -- Loop through queue items, and attempt to run them
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174 for i = 1,n do
7724
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175 local queued_input = q[i];
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176 local ok, new_state = coroutine.resume(thread, queued_input);
5788
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177 if not ok then
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178 -- There was an error running the coroutine, save the error, mark runner as ready to begin again
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179 consumed, state, err = i, "ready", debug.traceback(thread, new_state);
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180 self.thread = nil;
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181 break;
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182 elseif new_state == "wait" then
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183 -- Runner is blocked on waiting for a task item to complete
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184 consumed, state = i, "waiting";
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185 break;
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186 end
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187 end
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188 -- Loop ended - either queue empty because all tasks passed without blocking (consumed == nil)
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189 -- or runner is blocked/errored, and consumed will contain the number of tasks processed so far
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190 if not consumed then consumed = n; end
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191 -- Remove consumed items from the queue array
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192 if q[n+1] ~= nil then
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193 n = #q;
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194 end
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195 for i = 1, n do
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196 q[i] = q[consumed+i];
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197 end
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198 n = #q;
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199 end
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200 -- Runner processed all items it can, so save current runner state
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201 self.state = state;
5794
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
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diff changeset
202 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
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diff changeset
203 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
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diff changeset
204 if err then
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
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diff changeset
205 state = "error"
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diff changeset
206 else
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diff changeset
207 self.notified_state = state;
66c3ad5d29ad util.async: Fix logic bug that prevented error watcher being called for runners
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diff changeset
208 end
5788
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209 local handler = self.watchers[state];
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210 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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diff changeset
211 end
8615
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
Matthew Wild <mwild1@gmail.com>
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diff changeset
212 if n > 0 then
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
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diff changeset
213 return self:run();
e77b37de482e util.async: Behaviour change: continue to process queued items after errors
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diff changeset
214 end
5788
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diff changeset
215 return true, state, n;
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216 end
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217
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218 -- Add a task item to the queue without invoking the runner, even if it is idle
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219 function runner_mt:enqueue(input)
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diff changeset
220 table.insert(self.queue, input);
8602
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diff changeset
221 self:log("debug", "queued new work item, %d items queued", #self.queue);
8766
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diff changeset
222 return self;
5788
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diff changeset
223 end
3556f338caa3 util.async: New library to provide support around coroutine-based non-blocking functions
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parents:
diff changeset
224
8600
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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diff changeset
225 function runner_mt:log(level, fmt, ...)
8788
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diff changeset
226 return self._log(level, fmt, ...);
8600
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diff changeset
227 end
96f20cf92b84 util.async: Add per-runner ids and add runner:log() method
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diff changeset
228
8766
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diff changeset
229 function runner_mt:onready(f)
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diff changeset
230 self.watchers.ready = f;
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
231 return self;
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
232 end
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diff changeset
233
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
234 function runner_mt:onwaiting(f)
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diff changeset
235 self.watchers.waiting = f;
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
236 return self;
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
237 end
01264bc60c2b util.async: Add helper methods for setting watchers
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238
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diff changeset
239 function runner_mt:onerror(f)
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diff changeset
240 self.watchers.error = f;
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diff changeset
241 return self;
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
242 end
01264bc60c2b util.async: Add helper methods for setting watchers
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diff changeset
243
8648
ca710a71d730 util.async: Add ready() to check whether running in async context
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diff changeset
244 local function ready()
ca710a71d730 util.async: Add ready() to check whether running in async context
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diff changeset
245 return pcall(checkthread);
ca710a71d730 util.async: Add ready() to check whether running in async context
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diff changeset
246 end
ca710a71d730 util.async: Add ready() to check whether running in async context
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diff changeset
247
8649
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diff changeset
248 return {
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249 ready = ready;
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diff changeset
250 waiter = waiter;
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diff changeset
251 guarder = guarder;
8651
1b7c5933b215 util.async: Add sleep() method
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diff changeset
252 runner = runner;
8649
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diff changeset
253 };