prosody
d6be4dda1f60
util/promise.lua

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util/promise.lua @ 11694:d6be4dda1f60

net.server_epoll: Set minimum wait time to 1ms, matching epoll A timeout value less than 0.001 gets turned into zero on the C side, so epoll_wait() returns instantly and essentially busy-loops up to 1ms, e.g. when a timer event ends up scheduled (0, 0.001)ms into the future. Unsure if this has much effect in practice, but it may waste a small amount of CPU time. How much would depend on how often this ends up happening and how fast the CPU gets trough main loop iterations.
author Kim Alvefur <zash@zash.se>
date Thu, 15 Jul 2021 01:38:44 +0200
parent 11486:78d843faaffc
child 11947:073e53b72792
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1 local promise_methods = {};
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2 local promise_mt = { __name = "promise", __index = promise_methods };
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3
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4 local xpcall = require "util.xpcall".xpcall;
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5 local unpack = table.unpack or unpack; --luacheck: ignore 113
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6
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7 function promise_mt:__tostring()
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8 return "promise (" .. (self._state or "invalid") .. ")";
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9 end
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10
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11 local function is_promise(o)
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12 local mt = getmetatable(o);
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13 return mt == promise_mt;
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14 end
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15
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16 local function wrap_handler(f, resolve, reject, default)
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17 if not f then
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18 return default;
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19 end
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20 return function (param)
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21 local ok, ret = xpcall(f, debug.traceback, param);
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22 if ok then
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23 resolve(ret);
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24 else
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25 reject(ret);
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26 end
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27 return true;
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28 end;
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29 end
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30
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31 local function next_pending(self, on_fulfilled, on_rejected, resolve, reject)
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32 table.insert(self._pending_on_fulfilled, wrap_handler(on_fulfilled, resolve, reject, resolve));
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33 table.insert(self._pending_on_rejected, wrap_handler(on_rejected, resolve, reject, reject));
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34 end
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35
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36 local function next_fulfilled(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_rejected
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37 wrap_handler(on_fulfilled, resolve, reject, resolve)(promise.value);
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38 end
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39
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40 local function next_rejected(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_fulfilled
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41 wrap_handler(on_rejected, resolve, reject, reject)(promise.reason);
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42 end
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43
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44 local function promise_settle(promise, new_state, new_next, cbs, value)
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45 if promise._state ~= "pending" then
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46 return;
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47 end
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48 promise._state = new_state;
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49 promise._next = new_next;
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50 for _, cb in ipairs(cbs) do
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51 cb(value);
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52 end
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53 -- No need to keep references to callbacks
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54 promise._pending_on_fulfilled = nil;
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55 promise._pending_on_rejected = nil;
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56 return true;
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57 end
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58
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59 local function new_resolve_functions(p)
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60 local resolved = false;
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61 local function _resolve(v)
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62 if resolved then return; end
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63 resolved = true;
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64 if is_promise(v) then
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65 v:next(new_resolve_functions(p));
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66 elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then
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67 p.value = v;
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68 end
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69
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70 end
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71 local function _reject(e)
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72 if resolved then return; end
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73 resolved = true;
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74 if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
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75 p.reason = e;
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76 end
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77 end
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78 return _resolve, _reject;
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79 end
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80
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81 local function new(f)
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82 local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
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83 if f then
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84 local resolve, reject = new_resolve_functions(p);
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85 local ok, ret = xpcall(f, debug.traceback, resolve, reject);
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86 if not ok and p._state == "pending" then
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87 reject(ret);
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88 end
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89 end
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90 return p;
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91 end
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92
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93 local function all(promises)
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94 return new(function (resolve, reject)
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95 local settled, results, loop_finished = 0, {}, false;
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96 local total = 0;
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97 for k, v in pairs(promises) do
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98 if is_promise(v) then
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99 total = total + 1;
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100 v:next(function (value)
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101 results[k] = value;
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102 settled = settled + 1;
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103 if settled == total and loop_finished then
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104 resolve(results);
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105 end
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106 end, reject);
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107 else
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108 results[k] = v;
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109 end
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110 end
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111 loop_finished = true;
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112 if settled == total then
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113 resolve(results);
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114 end
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115 end);
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116 end
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117
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118 local function all_settled(promises)
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119 return new(function (resolve)
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120 local settled, results, loop_finished = 0, {}, false;
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121 local total = 0;
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122 for k, v in pairs(promises) do
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123 if is_promise(v) then
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124 total = total + 1;
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125 v:next(function (value)
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126 results[k] = { status = "fulfilled", value = value };
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127 settled = settled + 1;
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128 if settled == total and loop_finished then
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129 resolve(results);
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130 end
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131 end, function (e)
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132 results[k] = { status = "rejected", reason = e };
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133 settled = settled + 1;
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134 if settled == total and loop_finished then
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135 resolve(results);
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136 end
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137 end);
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138 else
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139 results[k] = v;
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140 end
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141 end
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142 loop_finished = true;
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143 if settled == total then
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144 resolve(results);
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145 end
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146 end);
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147 end
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148
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149 local function join(handler, ...)
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150 local promises, n = { ... }, select("#", ...);
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151 return all(promises):next(function (results)
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152 return handler(unpack(results, 1, n));
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153 end);
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154 end
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155
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156 local function race(promises)
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157 return new(function (resolve, reject)
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158 for i = 1, #promises do
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159 promises[i]:next(resolve, reject);
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160 end
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161 end);
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162 end
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163
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164 local function resolve(v)
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165 return new(function (_resolve)
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166 _resolve(v);
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167 end);
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168 end
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169
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170 local function reject(v)
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171 return new(function (_, _reject)
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172 _reject(v);
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173 end);
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174 end
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175
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176 local function try(f)
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177 return resolve():next(function () return f(); end);
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178 end
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179
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180 function promise_methods:next(on_fulfilled, on_rejected)
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181 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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182 self:_next(on_fulfilled, on_rejected, resolve, reject);
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183 end);
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184 end
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185
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186 function promise_methods:catch(on_rejected)
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187 return self:next(nil, on_rejected);
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188 end
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189
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190 function promise_methods:finally(on_finally)
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191 local function _on_finally(value) on_finally(); return value; end
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192 local function _on_catch_finally(err) on_finally(); return reject(err); end
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193 return self:next(_on_finally, _on_catch_finally);
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194 end
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195
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196 return {
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197 new = new;
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198 resolve = resolve;
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199 join = join;
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200 reject = reject;
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201 all = all;
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202 all_settled = all_settled;
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203 race = race;
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204 try = try;
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205 is_promise = is_promise;
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206 }