prosody
d30c44a829c1
util/promise.lua

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util/promise.lua @ 11409:d30c44a829c1

net.http.server: Set request.ip so mod_http doesn't have to Because it already sets request.secure, which depends on the connection, just like the IP, so it makes sense to do both in the same place. Dealing with proxies can be left to mod_http for now, but maybe it could move into some util some day?
author Kim Alvefur <zash@zash.se>
date Sat, 27 Feb 2021 21:37:16 +0100
parent 11211:1151140fc757
child 11483:24ce9d380475
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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 = xpcall(f, debug.traceback, 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 }