@mapbox/callback-timeout NPM

callback-timeout

This is a fork of https://github.com/jasonpincin/callback-timeout. The primary difference is that setImmediate is used directly after a setTimeout to cause the timeout callback to occur after IO operations in the node event loop.

Executes callback with single error argument if timeout is exceeded before it's called naturally

example

var timeout = require('@mapbox/callback-timeout')

function doSomethingFast(cb) { setTimeout(cb, 100) }
function doSomethingSlow(cb) { setTimeout(cb, 2000) }

doSomethingFast(timeout(function doSomethingFastHandler (err) {
  if (err)
    console.log(err.code, err.message) // Will not happen
  else
    console.log('doSomethingFastHandler executed without error.') // Will happen
}, 1000))

doSomethingSlow(timeout(function doSomethingSlowHandler (err) {
  if (err)
    console.log(err.code, err.message) // ETIMEDOUT ... 
  else
    console.log('doSomethingSlowHandler executed without error.') // Will not happen
}, 1000))

usage

var timeout      = require('@mapbox/callback-timeout'),
    TimeoutError = require('@mapbox/callback-timeout/errors').TimeoutError

timeout(callback , ms, msg)

Returns a callback function that will execute after ms milliseconds with a single TimeoutError argument if not invoked by other means first. If the ms timeout argument is omitted, 0, or null, then the timeout is disabled and the original callback is returned. msg may be used to set a custom error message (on timeout), otherwise an appropriate one will be set for you. If false is set for the timeout message the callback is returned without an error (null, on timeout).

TimeoutError

The constructor of the error supplied to the callback when a timeout occurs. TimeoutError objects will have a code property with the value ETIMEDOUT.