root / HServer / 00.Server / 00.Program / node_modules / async / asyncify.js
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| 1 | 39 | HKM | 'use strict';
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| 2 | |||
| 3 | Object.defineProperty(exports, "__esModule", {
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| 4 | value: true |
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| 5 | }); |
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| 6 | exports.default = asyncify;
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| 7 | |||
| 8 | var _isObject = require('lodash/isObject'); |
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| 9 | |||
| 10 | var _isObject2 = _interopRequireDefault(_isObject);
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| 11 | |||
| 12 | var _initialParams = require('./internal/initialParams'); |
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| 13 | |||
| 14 | var _initialParams2 = _interopRequireDefault(_initialParams);
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| 15 | |||
| 16 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
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| 17 | |||
| 18 | /**
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| 19 | * Take a sync function and make it async, passing its return value to a
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| 20 | * callback. This is useful for plugging sync functions into a waterfall,
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| 21 | * series, or other async functions. Any arguments passed to the generated
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| 22 | * function will be passed to the wrapped function (except for the final
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| 23 | * callback argument). Errors thrown will be passed to the callback.
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| 24 | *
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| 25 | * If the function passed to `asyncify` returns a Promise, that promises's
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| 26 | * resolved/rejected state will be used to call the callback, rather than simply
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| 27 | * the synchronous return value.
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| 28 | *
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| 29 | * This also means you can asyncify ES2016 `async` functions.
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| 30 | *
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| 31 | * @name asyncify
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| 32 | * @static
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| 33 | * @memberOf module:Utils
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| 34 | * @method
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| 35 | * @alias wrapSync
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| 36 | * @category Util
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| 37 | * @param {Function} func - The synchronous function to convert to an
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| 38 | * asynchronous function.
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| 39 | * @returns {Function} An asynchronous wrapper of the `func`. To be invoked with
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| 40 | * (callback).
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| 41 | * @example
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| 42 | *
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| 43 | * // passing a regular synchronous function
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| 44 | * async.waterfall([
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| 45 | * async.apply(fs.readFile, filename, "utf8"),
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| 46 | * async.asyncify(JSON.parse),
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| 47 | * function (data, next) {
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| 48 | * // data is the result of parsing the text.
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| 49 | * // If there was a parsing error, it would have been caught.
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| 50 | * }
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| 51 | * ], callback);
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| 52 | *
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| 53 | * // passing a function returning a promise
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| 54 | * async.waterfall([
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| 55 | * async.apply(fs.readFile, filename, "utf8"),
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| 56 | * async.asyncify(function (contents) {
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| 57 | * return db.model.create(contents);
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| 58 | * }),
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| 59 | * function (model, next) {
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| 60 | * // `model` is the instantiated model object.
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| 61 | * // If there was an error, this function would be skipped.
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| 62 | * }
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| 63 | * ], callback);
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| 64 | *
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| 65 | * // es6 example
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| 66 | * var q = async.queue(async.asyncify(async function(file) {
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| 67 | * var intermediateStep = await processFile(file);
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| 68 | * return await somePromise(intermediateStep)
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| 69 | * }));
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| 70 | *
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| 71 | * q.push(files);
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| 72 | */
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| 73 | function asyncify(func) { |
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| 74 | return (0, _initialParams2.default)(function (args, callback) { |
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| 75 | var result;
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| 76 | try {
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| 77 | result = func.apply(this, args);
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| 78 | } catch (e) {
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| 79 | return callback(e);
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| 80 | } |
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| 81 | // if result is Promise object
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| 82 | if ((0, _isObject2.default)(result) && typeof result.then === 'function') { |
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| 83 | result.then(function (value) {
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| 84 | callback(null, value);
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| 85 | }, function (err) {
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| 86 | callback(err.message ? err : new Error(err));
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| 87 | }); |
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| 88 | } else {
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| 89 | callback(null, result);
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| 90 | } |
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| 91 | }); |
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| 92 | } |
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| 93 | module.exports = exports['default']; |