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util.promise: Add join() convenience method

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Usage: promise.join(p1, p2, function (result1, result2)
  [...]
end)
This commit is contained in:
Matthew Wild 2021-03-25 14:28:38 +00:00
parent 3952fae8ce
commit 2141d9d94a
2 changed files with 37 additions and 0 deletions
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11
util/promise.lua
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@ -2,6 +2,7 @@ local promise_methods = {};
local promise_mt = { __name = "promise", __index = promise_methods };
local xpcall = require "util.xpcall".xpcall;
local unpack = table.unpack or unpack; --luacheck: ignore 113
function promise_mt:__tostring()
return "promise (" .. (self._state or "invalid") .. ")";
@ -137,6 +138,15 @@ local function all_settled(promises)
end);
end
local function join(...)
local promises, n = { ... }, select("#", ...);
local handler = promises[n];
promises[n] = nil;
return all(promises):next(function (results)
return handler(unpack(results, 1, n - 1));
end);
end
local function race(promises)
return new(function (resolve, reject)
for i = 1, #promises do
@ -180,6 +190,7 @@ end
return {
new = new;
resolve = resolve;
join = join;
reject = reject;
all = all;
all_settled = all_settled;