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util/promise.lua

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util/promise.lua @ 13209:c8d949cf6b09

plugins: Switch to :get_option_period() for time range options Improves readability ("1 day" vs 86400) and centralizes validation.
author Kim Alvefur <zash@zash.se>
date Sun, 16 Jul 2023 20:49:33 +0200
parent 12975:d10957394a3c
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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 "prosody.util.xpcall".xpcall;
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5 local unpack = table.unpack;
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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 function _resolve(v)
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61 if is_promise(v) then
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62 v:next(new_resolve_functions(p));
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63 elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then
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64 p.value = v;
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65 end
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66
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67 end
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68 local function _reject(e)
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69 if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
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70 p.reason = e;
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71 end
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72 end
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73 return _resolve, _reject;
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74 end
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75
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76 local next_tick = function (f)
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77 f();
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78 end
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79
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80 local function new(f)
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81 local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
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82 if f then
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83 next_tick(function()
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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 end
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91 return p;
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92 end
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93
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94 local function all(promises)
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95 return new(function (resolve, reject)
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96 local settled, results, loop_finished = 0, {}, false;
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97 local total = 0;
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98 for k, v in pairs(promises) do
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99 if is_promise(v) then
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100 total = total + 1;
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101 v:next(function (value)
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102 results[k] = value;
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103 settled = settled + 1;
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104 if settled == total and loop_finished then
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105 resolve(results);
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106 end
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107 end, reject);
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108 else
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109 results[k] = v;
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110 end
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111 end
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112 loop_finished = true;
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113 if settled == total then
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114 resolve(results);
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115 end
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116 end);
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117 end
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118
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119 local function all_settled(promises)
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120 return new(function (resolve)
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121 local settled, results, loop_finished = 0, {}, false;
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122 local total = 0;
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123 for k, v in pairs(promises) do
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124 if is_promise(v) then
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125 total = total + 1;
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126 v:next(function (value)
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127 results[k] = { status = "fulfilled", value = value };
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128 settled = settled + 1;
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129 if settled == total and loop_finished then
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130 resolve(results);
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131 end
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132 end, function (e)
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133 results[k] = { status = "rejected", reason = e };
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134 settled = settled + 1;
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135 if settled == total and loop_finished then
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136 resolve(results);
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137 end
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138 end);
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139 else
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140 results[k] = v;
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141 end
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142 end
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143 loop_finished = true;
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144 if settled == total then
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145 resolve(results);
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146 end
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147 end);
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148 end
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149
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150 local function join(handler, ...)
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151 local promises, n = { ... }, select("#", ...);
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152 return all(promises):next(function (results)
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153 return handler(unpack(results, 1, n));
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154 end);
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155 end
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156
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157 local function race(promises)
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158 return new(function (resolve, reject)
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159 for i = 1, #promises do
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160 promises[i]:next(resolve, reject);
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161 end
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162 end);
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163 end
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164
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165 local function resolve(v)
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166 return new(function (_resolve)
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167 _resolve(v);
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168 end);
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169 end
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170
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171 local function reject(v)
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172 return new(function (_, _reject)
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173 _reject(v);
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174 end);
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175 end
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176
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177 local function try(f)
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178 return resolve():next(function () return f(); end);
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179 end
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180
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181 function promise_methods:next(on_fulfilled, on_rejected)
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182 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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183 self:_next(on_fulfilled, on_rejected, resolve, reject);
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184 end);
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185 end
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186
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187 function promise_methods:catch(on_rejected)
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188 return self:next(nil, on_rejected);
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189 end
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190
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191 function promise_methods:finally(on_finally)
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192 local function _on_finally(value) on_finally(); return value; end
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193 local function _on_catch_finally(err) on_finally(); return reject(err); end
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194 return self:next(_on_finally, _on_catch_finally);
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195 end
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196
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197 return {
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198 new = new;
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199 resolve = resolve;
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200 join = join;
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201 reject = reject;
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202 all = all;
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203 all_settled = all_settled;
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204 race = race;
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205 try = try;
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206 is_promise = is_promise;
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207 set_nexttick = function(new_next_tick) next_tick = new_next_tick; end;
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208 }