Hi Alen, Check out the "race" method of promises, might help simplify this a lot.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/race Cheers, Gus On Thu, Jun 25, 2015 at 3:06 PM, <a...@vidao.com> wrote: > 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; > > > > -- > Job board: http://jobs.nodejs.org/ > New group rules: > https://gist.github.com/othiym23/9886289#file-moderation-policy-md > Old group rules: > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines > --- > You received this message because you are subscribed to the Google Groups > "nodejs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to nodejs+unsubscr...@googlegroups.com. > To post to this group, send email to nodejs@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/nodejs/4c1b478c-b2ff-453d-b35d-d5a4de967af2%40googlegroups.com > <https://groups.google.com/d/msgid/nodejs/4c1b478c-b2ff-453d-b35d-d5a4de967af2%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- Job board: http://jobs.nodejs.org/ New group rules: https://gist.github.com/othiym23/9886289#file-moderation-policy-md Old group rules: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to nodejs+unsubscr...@googlegroups.com. To post to this group, send email to nodejs@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/nodejs/CAJkwh4Kg%3D3HayO_Dkh1SHSpa2SncY7JN4QzuKMacJBHPBXgE5Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
