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util/promise.lua @ 10783:950082c1669e 0.11
mod_tls: Log when certificates are (re)loaded
Meant to reduce user confusion over what's reloaded and not.
author | Kim Alvefur <zash@zash.se> |
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date | Sun, 26 Apr 2020 20:58:51 +0200 |
parent | 9562:acf74ad0b795 |
child | 9745:0dbb285f903e |
child | 11210:75636bf13bf0 |
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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 return true; |
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53 end |
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54 |
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55 local function new_resolve_functions(p) |
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56 local resolved = false; |
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57 local function _resolve(v) |
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58 if resolved then return; end |
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59 resolved = true; |
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60 if is_promise(v) then |
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61 v:next(new_resolve_functions(p)); |
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62 elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then |
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63 p.value = v; |
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64 end |
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65 |
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66 end |
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67 local function _reject(e) |
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68 if resolved then return; end |
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69 resolved = true; |
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70 if promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then |
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71 p.reason = e; |
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72 end |
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73 end |
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74 return _resolve, _reject; |
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75 end |
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76 |
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77 local function new(f) |
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78 local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt); |
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79 if f then |
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80 local resolve, reject = new_resolve_functions(p); |
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81 local ok, ret = pcall(f, resolve, reject); |
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82 if not ok and p._state == "pending" then |
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83 reject(ret); |
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84 end |
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85 end |
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86 return p; |
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87 end |
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88 |
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89 local function all(promises) |
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90 return new(function (resolve, reject) |
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91 local count, total, results = 0, #promises, {}; |
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92 for i = 1, total do |
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93 promises[i]:next(function (v) |
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94 results[i] = v; |
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95 count = count + 1; |
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96 if count == total then |
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97 resolve(results); |
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98 end |
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99 end, reject); |
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100 end |
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101 end); |
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102 end |
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103 |
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104 local function race(promises) |
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105 return new(function (resolve, reject) |
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106 for i = 1, #promises do |
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107 promises[i]:next(resolve, reject); |
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108 end |
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109 end); |
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110 end |
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111 |
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112 local function resolve(v) |
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113 return new(function (_resolve) |
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114 _resolve(v); |
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115 end); |
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116 end |
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117 |
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118 local function reject(v) |
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119 return new(function (_, _reject) |
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120 _reject(v); |
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121 end); |
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122 end |
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123 |
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124 local function try(f) |
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125 return resolve():next(function () return f(); end); |
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126 end |
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127 |
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128 function promise_methods:next(on_fulfilled, on_rejected) |
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129 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject |
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130 self:_next(on_fulfilled, on_rejected, resolve, reject); |
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131 end); |
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132 end |
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133 |
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134 function promise_methods:catch(on_rejected) |
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135 return self:next(nil, on_rejected); |
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136 end |
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137 |
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138 function promise_methods:finally(on_finally) |
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139 local function _on_finally(value) on_finally(); return value; end |
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140 local function _on_catch_finally(err) on_finally(); return reject(err); end |
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141 return self:next(_on_finally, _on_catch_finally); |
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142 end |
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143 |
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144 return { |
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145 new = new; |
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146 resolve = resolve; |
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147 reject = reject; |
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148 all = all; |
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149 race = race; |
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150 try = try; |
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151 is_promise = is_promise; |
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152 } |