prosody
c434bff22b14
util/promise.lua

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util/promise.lua @ 10303:c434bff22b14

mod_csi_simple: Always remove session filters when disabling CSI Only guard the actual pausing of outgoing data on the method existing. This prevents the filters from lingering in case something happened to the connection. Removing already removed filters should be a safe noop.
author Kim Alvefur <zash@zash.se>
date Sat, 05 Oct 2019 16:55:58 +0200
parent 9745:0dbb285f903e
child 10922:7d3dbb9eb3eb
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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 race(promises)
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108 return new(function (resolve, reject)
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109 for i = 1, #promises do
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110 promises[i]:next(resolve, reject);
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111 end
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112 end);
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113 end
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114
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115 local function resolve(v)
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116 return new(function (_resolve)
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117 _resolve(v);
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118 end);
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119 end
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120
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121 local function reject(v)
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122 return new(function (_, _reject)
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123 _reject(v);
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124 end);
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125 end
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126
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127 local function try(f)
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128 return resolve():next(function () return f(); end);
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129 end
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130
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131 function promise_methods:next(on_fulfilled, on_rejected)
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132 return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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133 self:_next(on_fulfilled, on_rejected, resolve, reject);
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134 end);
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135 end
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136
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137 function promise_methods:catch(on_rejected)
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138 return self:next(nil, on_rejected);
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139 end
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140
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141 function promise_methods:finally(on_finally)
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142 local function _on_finally(value) on_finally(); return value; end
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143 local function _on_catch_finally(err) on_finally(); return reject(err); end
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144 return self:next(_on_finally, _on_catch_finally);
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145 end
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146
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147 return {
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148 new = new;
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149 resolve = resolve;
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150 reject = reject;
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151 all = all;
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152 race = race;
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153 try = try;
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154 is_promise = is_promise;
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155 }