47 lines
1.0 KiB
JavaScript
47 lines
1.0 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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class Serializer {
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constructor(middlewares, context) {
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this.middlewares = middlewares;
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this.context = context;
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}
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serialize(obj, context) {
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const ctx = { ...context, ...this.context };
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return new Promise((resolve, reject) =>
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resolve(
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this.middlewares.reduce((last, middleware) => {
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if (last instanceof Promise) {
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return last.then(
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data => data && middleware.serialize(data, context)
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);
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} else if (last) {
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try {
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return middleware.serialize(last, ctx);
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} catch (err) {
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return Promise.reject(err);
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}
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}
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}, obj)
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)
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);
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}
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deserialize(context) {
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const ctx = { ...context, ...this.context };
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return Promise.resolve().then(() =>
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this.middlewares.reduceRight((last, middleware) => {
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if (last instanceof Promise)
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return last.then(data => middleware.deserialize(data, context));
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else return middleware.deserialize(last, ctx);
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}, [])
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);
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}
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}
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module.exports = Serializer;
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