util/promise.lua
author Matthew Wild <mwild1@gmail.com>
Thu, 25 Oct 2018 15:24:52 +0100
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parent 9552 800c274928bf
child 9561 5fa73fbb047f
permissions -rw-r--r--
util.promise: Fix missing parameters
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local promise_methods = {};
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local promise_mt = { __name = "promise", __index = promise_methods };
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function promise_mt:__tostring()
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	return  "promise (" .. (self._state or "invalid") .. ")";
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end
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local function is_promise(o)
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	local mt = getmetatable(o);
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	return mt == promise_mt;
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end
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local function wrap_handler(f, resolve, reject, default)
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	if not f then
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		return default;
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	end
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	return function (param)
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		local ok, ret = pcall(f, param);
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		if ok then
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			resolve(ret);
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		else
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			reject(ret);
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		end
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		return true;
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	end;
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end
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local function next_pending(self, on_fulfilled, on_rejected, resolve, reject)
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	table.insert(self._pending_on_fulfilled, wrap_handler(on_fulfilled, resolve, reject, resolve));
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	table.insert(self._pending_on_rejected, wrap_handler(on_rejected, resolve, reject, reject));
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end
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local function next_fulfilled(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_rejected
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	wrap_handler(on_fulfilled, resolve, reject, resolve)(promise.value);
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end
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local function next_rejected(promise, on_fulfilled, on_rejected, resolve, reject) -- luacheck: ignore 212/on_fulfilled
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	wrap_handler(on_rejected, resolve, reject, reject)(promise.reason);
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end
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local function promise_settle(promise, new_state, new_next, cbs, value)
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	if promise._state ~= "pending" then
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		return;
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	end
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	promise._state = new_state;
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	promise._next = new_next;
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	for _, cb in ipairs(cbs) do
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		cb(value);
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	end
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	return true;
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end
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local function new_resolve_functions(p)
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	local resolved = false;
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	local function _resolve(v)
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		if resolved then return; end
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		resolved = true;
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		if is_promise(v) then
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			v:next(new_resolve_functions(p));
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		elseif promise_settle(p, "fulfilled", next_fulfilled, p._pending_on_fulfilled, v) then
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			p.value = v;
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		end
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	end
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	local function _reject(e)
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		if resolved then return; end
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		resolved = true;
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		if is_promise(e) then
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			e:next(new_resolve_functions(p));
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		elseif promise_settle(p, "rejected", next_rejected, p._pending_on_rejected, e) then
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			p.reason = e;
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		end
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	end
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	return _resolve, _reject;
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end
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local function new(f)
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	local p = setmetatable({ _state = "pending", _next = next_pending, _pending_on_fulfilled = {}, _pending_on_rejected = {} }, promise_mt);
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	if f then
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		local resolve, reject = new_resolve_functions(p);
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		local ok, ret = pcall(f, resolve, reject);
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		if not ok and p._state == "pending" then
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			reject(ret);
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		end
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	end
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	return p;
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end
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local function all(promises)
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	return new(function (resolve, reject)
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		local count, total, results = 0, #promises, {};
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		for i = 1, total do
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			promises[i]:next(function (v)
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				results[i] = v;
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				count = count + 1;
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				if count == total then
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					resolve(results);
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				end
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			end, reject);
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		end
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	end);
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end
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local function race(promises)
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	return new(function (resolve, reject)
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		for i = 1, #promises do
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			promises[i]:next(resolve, reject);
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		end
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	end);
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end
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local function resolve(v)
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	return new(function (_resolve)
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		_resolve(v);
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	end);
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end
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local function reject(v)
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	return new(function (_, _reject)
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		_reject(v);
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	end);
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end
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local function try(f)
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	return resolve():next(function () return f(); end);
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end
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function promise_methods:next(on_fulfilled, on_rejected)
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	return new(function (resolve, reject) --luacheck: ignore 431/resolve 431/reject
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		self:_next(on_fulfilled, on_rejected, resolve, reject);
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	end);
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end
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function promise_methods:catch(on_rejected)
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	return self:next(nil, on_rejected);
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end
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function promise_methods:finally(on_finally)
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	local function _on_finally(value) on_finally(); return value; end
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	local function _on_catch_finally(err) on_finally(); return reject(err); end
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	return self:next(_on_finally, _on_catch_finally);
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end
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return {
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	new = new;
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	resolve = resolve;
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	reject = reject;
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	all = all;
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	race = race;
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	try = try;
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	is_promise = is_promise;
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}