Hello,
Being relatively new to promises, a few months into using them (the native
implementation on nodejs) I found myself adding timeout rejections
repeatedly. For me it is a very common use case.
I took a quick look and didn't find Promises with built in timeouts. The
code below is my wrapper to handle that, it seems to work fine & passes my
tests. The 2 questions I have are (1) is there something that's commonly
used for this that I missed in my search and (2) if not - does the wrapper
seem alright or is there a potential problem?
Thank you!
Alen
var DEFAULT_TIMEOUT = 5000;
var TimedPromise = function(timeoutAfter) {
var _self = this;
var _rejectFunc;
var _resolveFunc;
var _timeoutMs = timeoutAfter ? timeoutAfter : DEFAULT_TIMEOUT;
var _promise = new Promise(function(resolveFunc, rejectFunc) {
_resolveFunc = resolveFunc.bind(this);
_rejectFunc = rejectFunc.bind(this);
});
var _timeout = setTimeout(function() {
if (_rejectFunc) {
_rejectFunc(Error('timeout'));
}
else {
_promise.then = function() {
return Promise.reject(new Error('timeout'));
};
}
},
_timeoutMs
);
_self.resolve = function(arg) {
if (_timeout) {
clearTimeout(_timeout);
}
_resolveFunc(arg);
};
_self.reject = function(arg) {
if (_timeout) {
clearTimeout(_timeout);
}
_rejectFunc(arg);
};
_self.promise = function() {
return _promise;
};
};
exports = module.exports = TimedPromise;
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