101 lines
2.6 KiB
TypeScript
101 lines
2.6 KiB
TypeScript
// Copyright IBM Corp. 2016,2019. All Rights Reserved.
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// Node module: loopback-connector
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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import { createPromiseCallback } from './utils';
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import msgpack from 'msgpack5';
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/**
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* Create a new Packer instance that can be used to convert between JavaScript
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* objects and a binary representation in a Buffer.
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*
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* Compared to JSON, this encoding preserves the following JavaScript types:
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* - Date
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*/
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class BinaryPacker {
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private _packer = msgpack({forceFloat64: true});
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encode(value: unknown, cb: Callback = createPromiseCallback()): Buffer {
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try {
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const data = this._packer.encode(value).slice();
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setImmediate(() => cb(null, data));
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} catch(err) {
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setImmediate(() => cb(err));
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}
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return cb.promise;
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}
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decode(value: Buffer, cb: Callback = createPromiseCallback()): unknown {
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try {
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const value = this._packer.decode(binary);
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setImmediate(function() {
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cb(null, value);
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});
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} catch (err) {
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setImmediate(function() {
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cb(err);
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});
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}
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return cb.promise;
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}
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}
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// /**
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// * Encode the provided value to a `Buffer`.
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// *
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// * @param {*} value Any value (string, number, object)
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// * @callback {Function} cb The callback to receive the parsed result.
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// * @param {Error} err
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// * @param {Buffer} data The encoded value
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// * @promise
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// */
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// BinaryPacker.prototype.encode = function(value, cb) {
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// cb = cb || createPromiseCallback();
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// try {
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// // msgpack5 returns https://www.npmjs.com/package/bl instead of Buffer
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// // use .slice() to convert to a Buffer
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// const data = this._packer.encode(value).slice();
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// setImmediate(function() {
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// cb(null, data);
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// });
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// } catch (err) {
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// setImmediate(function() {
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// cb(err);
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// });
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// }
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// return cb.promise;
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// };
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/**
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* Decode the binary value back to a JavaScript value.
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* @param {Buffer} binary The binary input.
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* @callback {Function} cb The callback to receive the composed value.
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* @param {Error} err
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* @param {*} value Decoded value.
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* @promise
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*/
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BinaryPacker.prototype.decode = function(binary, cb) {
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cb = cb || createPromiseCallback();
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try {
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const value = this._packer.decode(binary);
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setImmediate(function() {
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cb(null, value);
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});
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} catch (err) {
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setImmediate(function() {
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cb(err);
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});
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}
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return cb.promise;
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};
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function encodeDate(obj) {
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return new Buffer(obj.toISOString(), 'utf8');
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}
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function decodeDate(buf) {
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return new Date(buf.toString('utf8'));
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}
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