prosody
59557bc3c4b8
util/promise.lua

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util/promise.lua @ 12084:59557bc3c4b8 0.11

net.server_epoll: Process all queued events from epoll before timers Should call timers less frequently when many sockets are waiting for processing. May help under heavy load. Requested by Ge0rG Backport of 2bcd84123eba requested by Roi
author Kim Alvefur <zash@zash.se>
date Thu, 21 Oct 2021 15:59:16 +0200
parent 11210:75636bf13bf0
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 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 = xpcall(f, debug.traceback, 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 }