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<h1 class="page-title">asyncify.js</h1>
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<pre class="prettyprint source linenums"><code>import initialParams from './internal/initialParams.js'
import setImmediate from './internal/setImmediate.js'
import { isAsync } from './internal/wrapAsync.js'
/**
* Take a sync function and make it async, passing its return value to a
* callback. This is useful for plugging sync functions into a waterfall,
* series, or other async functions. Any arguments passed to the generated
* function will be passed to the wrapped function (except for the final
* callback argument). Errors thrown will be passed to the callback.
*
* If the function passed to `asyncify` returns a Promise, that promises's
* resolved/rejected state will be used to call the callback, rather than simply
* the synchronous return value.
*
* This also means you can asyncify ES2017 `async` functions.
*
* @name asyncify
* @static
* @memberOf module:Utils
* @method
* @alias wrapSync
* @category Util
* @param {Function} func - The synchronous function, or Promise-returning
* function to convert to an {@link AsyncFunction}.
* @returns {AsyncFunction} An asynchronous wrapper of the `func`. To be
* invoked with `(args..., callback)`.
* @example
*
* // passing a regular synchronous function
* async.waterfall([
* async.apply(fs.readFile, filename, "utf8"),
* async.asyncify(JSON.parse),
* function (data, next) {
* // data is the result of parsing the text.
* // If there was a parsing error, it would have been caught.
* }
* ], callback);
*
* // passing a function returning a promise
* async.waterfall([
* async.apply(fs.readFile, filename, "utf8"),
* async.asyncify(function (contents) {
* return db.model.create(contents);
* }),
* function (model, next) {
* // `model` is the instantiated model object.
* // If there was an error, this function would be skipped.
* }
* ], callback);
*
* // es2017 example, though `asyncify` is not needed if your JS environment
* // supports async functions out of the box
* var q = async.queue(async.asyncify(async function(file) {
* var intermediateStep = await processFile(file);
* return await somePromise(intermediateStep)
* }));
*
* q.push(files);
*/
export default function asyncify(func) {
if (isAsync(func)) {
return function (...args/*, callback*/) {
const callback = args.pop()
const promise = func.apply(this, args)
return handlePromise(promise, callback)
}
}
return initialParams(function (args, callback) {
var result;
try {
result = func.apply(this, args);
} catch (e) {
return callback(e);
}
// if result is Promise object
if (result && typeof result.then === 'function') {
return handlePromise(result, callback)
} else {
callback(null, result);
}
});
}
function handlePromise(promise, callback) {
return promise.then(value => {
invokeCallback(callback, null, value);
}, err => {
invokeCallback(callback, err && err.message ? err : new Error(err));
});
}
function invokeCallback(callback, error, value) {
try {
callback(error, value);
} catch (err) {
setImmediate(e => { throw e }, err);
}
}
</code></pre>
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