timeoutable-wrapper
v0.2.1
Published
Signals timeout of the wrapped function by throwing TimeoutError
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timeoutable-wrapper
A wrapper for a potentially long-running task to signal it's timed out. Does not halt the wrapped task, only signals it's timed out (it's your business how to react on the timeout) by throwing TimeoutError
. Supports both promises and node-style callbacks.
Install
npm i --save timeoutable-wrapper
Usage
const timeoutable = require('timeoutable-wrapper')
const potentiallyLongRunningTask = async function (arg1, arg2) {
/* some long-running code */
return result
}
// or, with callback
const anotherPotentiallyLongRunningTask = function (arg1, arg2, cb) {
/* some long-running code */
cb(null, result)
}
const timeoutableTask = timeoutable(potentiallyLongRunningTask, 5000)
const anotherTimeoutableTask = timeoutable(anotherPotentiallyLongRunningTask, 5000)
try {
// if task is not completed within 5000 msecs - throw TimeoutError
const result = await timeoutableTask(arg1, arg2)
// if another task is not called callback within 5000 msecs - throw TimeoutError
const result2 = await anotherTimeoutableTask(arg1, arg2)
} catch (err) {
if (err.name === 'TimeoutError') { // or err instanceof timeoutable.TimeoutError
// it's timeout
} else {
// it's something else
}
}
API
timeoutable (fn, ms) -> Function
Wraps passed function and returns another one, which throws TimeoutError
when specified ms
expired before fn
returned result.
timeoutable.using(PromiseLib) -> timeoutable
Returns an instance of timeoutable-wrapper that uses specified PromiseLib
to construct and return promises from the lib.
timeoutable.TimeoutError
Type for errors thrown on expired timeouts.