prosody
5fa73fbb047f
util/promise.lua

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util/promise.lua @ 9558:5fa73fbb047f

util.promise: Remove the non-standard ability to pass a promise to reject()
author Matthew Wild <mwild1@gmail.com>
date Fri, 26 Oct 2018 09:23:31 +0100
parent 9550:98de4c2e2627
child 9559:7c65e3f38e6e
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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 function promise_mt:__tostring()
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5 return "promise (" .. (self._state or "invalid") .. ")";
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6 end
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7
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8 local function is_promise(o)
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9 local mt = getmetatable(o);
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10 return mt == promise_mt;
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11 end
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12
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13 local function wrap_handler(f, resolve, reject, default)
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14 if not f then
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15 return default;
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16 end
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17 return function (param)
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18 local ok, ret = pcall(f, param);
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19 if ok then
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20 resolve(ret);
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21 else
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22 reject(ret);
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23 end
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24 return true;
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25 end;
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26 end
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27
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28 local function next_pending(self, on_fulfilled, on_rejected, resolve, reject)
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29 table.insert(self._pending_on_fulfilled, wrap_handler(on_fulfilled, resolve, reject, resolve));
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30 table.insert(self._pending_on_rejected, wrap_handler(on_rejected, resolve, reject, reject));
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31 end
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32
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33 local function next_fulfilled(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_rejected
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34 wrap_handler(on_fulfilled, resolve, reject, resolve)(promise.value);
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35 end
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36
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37 local function next_rejected(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_fulfilled
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38 wrap_handler(on_rejected, resolve, reject, reject)(promise.reason);
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39 end
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40
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41 local function promise_settle(promise, new_state, new_next, cbs, value)
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42 if promise._state ~= "pending" then
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43 return;
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44 end
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45 promise._state = new_state;
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46 promise._next = new_next;
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47 for _, cb in ipairs(cbs) do
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48 cb(value);
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49 end
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50 return true;
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51 end
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52
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53 local function new_resolve_functions(p)
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54 local resolved = false;
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55 local function _resolve(v)
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56 if resolved then return; end
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57 resolved = true;
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58 if is_promise(v) then
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59 v:next(new_resolve_functions(p));
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60 elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then
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61 p.value = v;
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62 end
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63
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64 end
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65 local function _reject(e)
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66 if resolved then return; end
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67 resolved = true;
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68 if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
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69 p.reason = e;
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70 end
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71 end
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72 return _resolve, _reject;
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73 end
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74
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75 local function new(f)
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76 local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
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77 if f then
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78 local resolve, reject = new_resolve_functions(p);
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79 local ok, ret = pcall(f, resolve, reject);
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80 if not ok and p._state == "pending" then
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81 reject(ret);
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82 end
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83 end
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84 return p;
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85 end
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86
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87 local function all(promises)
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88 return new(function (resolve, reject)
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89 local count, total, results = 0, #promises, {};
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90 for i = 1, total do
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91 promises[i]:next(function (v)
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92 results[i] = v;
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93 count = count + 1;
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94 if count == total then
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95 resolve(results);
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96 end
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97 end, reject);
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98 end
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99 end);
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100 end
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101
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102 local function race(promises)
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103 return new(function (resolve, reject)
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104 for i = 1, #promises do
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105 promises[i]:next(resolve, reject);
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106 end
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107 end);
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108 end
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109
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110 local function resolve(v)
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111 return new(function (_resolve)
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112 _resolve(v);
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113 end);
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114 end
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115
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116 local function reject(v)
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117 return new(function (_, _reject)
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118 _reject(v);
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119 end);
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120 end
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121
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122 local function try(f)
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123 return resolve():next(function () return f(); end);
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124 end
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125
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126 function promise_methods:next(on_fulfilled, on_rejected)
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127 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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128 self:_next(on_fulfilled, on_rejected, resolve, reject);
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129 end);
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130 end
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131
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132 function promise_methods:catch(on_rejected)
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133 return self:next(nil, on_rejected);
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134 end
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135
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136 function promise_methods:finally(on_finally)
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137 local function _on_finally(value) on_finally(); return value; end
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138 local function _on_catch_finally(err) on_finally(); return reject(err); end
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139 return self:next(_on_finally, _on_catch_finally);
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140 end
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141
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142 return {
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143 new = new;
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144 resolve = resolve;
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145 reject = reject;
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146 all = all;
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147 race = race;
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148 try = try;
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149 is_promise = is_promise;
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150 }