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tmfy

node npm npm

Timeouts for promises and promisified functions

Pronunciation: timeify, Thai-Me-Fy

Quick Start

npm install tmfy
var tmfy = require('tmfy');

var lib = {
	sendEmail: function(send_to) {
		// need 200ms to send
		return new Promise(function (r) { setTimeout(r, 200) });
	},
	sendEmailSlowly: function(send_to) {
		// need 20000ms to send
		return new Promise(function (r) { setTimeout(r, 20000) });
	}
};

tmfy.timeifyAll(lib);

lib.sendEmailTimeout(1000, 'me@apple.com') // timeout after 1000ms
	.then(function(result) {
		console.log('email sent');
	})
	.catch(function(error) {
		// never called
	});

lib.sendEmailSlowlyTimeout(1000, 'me@apple.com') // timeout after 1000ms
	.then(function(result) {
		// never called
	})
	.catch(function(error) {
		console.log('timeout first');
	});

API

timeout(mil, promise)

timeout(mil, handler, promise)

Returns a Promise.

  • Resolves if promise is resolved before milms timeout. promise result is passed.
  • Rejects if promise is rejected before milms timeout. promise error is passed.
  • Rejects with new Error('TIMEOUT') if milms timeout before promise is resolved or rejected.

If handler is set and have emit(), error event will be emitted on timeout with new Error('TIMEOUT').

timeify(func)

func must returns a Promise.

Returns a wrapped function around func which accepts mil as a first argument:

var funcTimeout = tmfy.timeify(func);
funcTimeout(1000, ...); // runs func(...) with 1000ms timeout

A wrapped function returns a Promise. Same logic as for timeout() applies. If this is set and have emit(), error event will be emitted on timeout with new Error('TIMEOUT').

timeifyAll(obj)

Extends obj with timeified versions of all functions. Adds 'Timeout' suffix to wrapped functions.

var obj = {
	func: function() { return Promise.resolve('success'); }
};
tmfy.timeifyAll(obj);
obj.funcTimeout(1000)
	.then(function(result) {
		// prints "success"
		result => console.log(result)
	})

License

Copyright (c) 2016 AfterShip

Licensed under the MIT license.

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