prosody
1f42b08b134f
util/promise.lua

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util/promise.lua @ 11052:1f42b08b134f

util.startup: Init util.error with defaults if none given
author Matthew Wild <mwild1@gmail.com>
date Fri, 28 Aug 2020 12:54:31 +0100
parent 10922:7d3dbb9eb3eb
child 11211:1151140fc757
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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
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6 function promise_mt:__tostring()
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7 return "promise (" .. (self._state or "invalid") .. ")";
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8 end
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9
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10 local function is_promise(o)
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11 local mt = getmetatable(o);
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12 return mt == promise_mt;
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13 end
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14
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15 local function wrap_handler(f, resolve, reject, default)
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16 if not f then
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17 return default;
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18 end
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19 return function (param)
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20 local ok, ret = xpcall(f, debug.traceback, param);
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21 if ok then
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22 resolve(ret);
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23 else
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24 reject(ret);
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25 end
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26 return true;
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27 end;
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28 end
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29
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30 local function next_pending(self, on_fulfilled, on_rejected, resolve, reject)
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31 table.insert(self._pending_on_fulfilled, wrap_handler(on_fulfilled, resolve, reject, resolve));
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32 table.insert(self._pending_on_rejected, wrap_handler(on_rejected, resolve, reject, reject));
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33 end
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34
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35 local function next_fulfilled(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_rejected
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36 wrap_handler(on_fulfilled, resolve, reject, resolve)(promise.value);
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37 end
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38
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39 local function next_rejected(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_fulfilled
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40 wrap_handler(on_rejected, resolve, reject, reject)(promise.reason);
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41 end
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42
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43 local function promise_settle(promise, new_state, new_next, cbs, value)
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44 if promise._state ~= "pending" then
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45 return;
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46 end
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47 promise._state = new_state;
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48 promise._next = new_next;
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49 for _, cb in ipairs(cbs) do
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50 cb(value);
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51 end
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52 -- No need to keep references to callbacks
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53 promise._pending_on_fulfilled = nil;
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54 promise._pending_on_rejected = nil;
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55 return true;
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56 end
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57
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58 local function new_resolve_functions(p)
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59 local resolved = false;
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60 local function _resolve(v)
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61 if resolved then return; end
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62 resolved = true;
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63 if is_promise(v) then
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64 v:next(new_resolve_functions(p));
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65 elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then
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66 p.value = v;
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67 end
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68
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69 end
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70 local function _reject(e)
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71 if resolved then return; end
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72 resolved = true;
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73 if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
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74 p.reason = e;
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75 end
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76 end
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77 return _resolve, _reject;
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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 local resolve, reject = new_resolve_functions(p);
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84 local ok, ret = pcall(f, resolve, reject);
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85 if not ok and p._state == "pending" then
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86 reject(ret);
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87 end
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88 end
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89 return p;
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90 end
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91
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92 local function all(promises)
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93 return new(function (resolve, reject)
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94 local count, total, results = 0, #promises, {};
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95 for i = 1, total do
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96 promises[i]:next(function (v)
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97 results[i] = v;
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98 count = count + 1;
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99 if count == total then
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100 resolve(results);
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101 end
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102 end, reject);
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103 end
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104 end);
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105 end
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106
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107 local function all_settled(promises)
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108 return new(function (resolve)
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109 local count, total, results = 0, #promises, {};
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110 for i = 1, total do
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111 promises[i]:next(function (v)
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112 results[i] = { status = "fulfilled", value = v };
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113 count = count + 1;
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114 if count == total then
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115 resolve(results);
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116 end
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117 end, function (e)
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118 results[i] = { status = "rejected", reason = e };
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119 count = count + 1;
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120 if count == total then
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121 resolve(results);
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122 end
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123 end);
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124 end
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125 end);
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126 end
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127
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128 local function race(promises)
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129 return new(function (resolve, reject)
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130 for i = 1, #promises do
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131 promises[i]:next(resolve, reject);
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132 end
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133 end);
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134 end
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135
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136 local function resolve(v)
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137 return new(function (_resolve)
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138 _resolve(v);
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139 end);
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140 end
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141
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142 local function reject(v)
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143 return new(function (_, _reject)
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144 _reject(v);
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145 end);
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146 end
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147
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148 local function try(f)
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149 return resolve():next(function () return f(); end);
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150 end
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151
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152 function promise_methods:next(on_fulfilled, on_rejected)
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153 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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154 self:_next(on_fulfilled, on_rejected, resolve, reject);
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155 end);
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156 end
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157
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158 function promise_methods:catch(on_rejected)
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159 return self:next(nil, on_rejected);
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160 end
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161
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162 function promise_methods:finally(on_finally)
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163 local function _on_finally(value) on_finally(); return value; end
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164 local function _on_catch_finally(err) on_finally(); return reject(err); end
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165 return self:next(_on_finally, _on_catch_finally);
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166 end
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167
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168 return {
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169 new = new;
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170 resolve = resolve;
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171 reject = reject;
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172 all = all;
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173 all_settled = all_settled;
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174 race = race;
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175 try = try;
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176 is_promise = is_promise;
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177 }