65 lines
1.6 KiB
JavaScript
65 lines
1.6 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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/**
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* @template T, K
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* @typedef {import("./SerializerMiddleware")<T, K>} SerializerMiddleware
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*/
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class Serializer {
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/**
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* @param {SerializerMiddleware<any, any>[]} middlewares serializer middlewares
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* @param {TODO=} context context
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*/
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constructor(middlewares, context) {
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this.serializeMiddlewares = middlewares.slice();
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this.deserializeMiddlewares = middlewares.slice().reverse();
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this.context = context;
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}
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/**
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* @param {any} obj object
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* @param {TODO} context content
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* @returns {Promise<any>} result
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*/
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serialize(obj, context) {
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const ctx = { ...context, ...this.context };
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let current = obj;
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for (const middleware of this.serializeMiddlewares) {
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if (current && typeof current.then === "function") {
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current = current.then(data => data && middleware.serialize(data, ctx));
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} else if (current) {
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try {
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current = middleware.serialize(current, ctx);
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} catch (err) {
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current = Promise.reject(err);
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}
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} else break;
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}
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return current;
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}
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/**
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* @param {any} value value
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* @param {TODO} context context
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* @returns {Promise<any>} result
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*/
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deserialize(value, context) {
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const ctx = { ...context, ...this.context };
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/** @type {any} */
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let current = value;
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for (const middleware of this.deserializeMiddlewares) {
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current =
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current && typeof current.then === "function"
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? current.then(data => middleware.deserialize(data, ctx))
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: middleware.deserialize(current, ctx);
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}
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return current;
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}
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}
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module.exports = Serializer;
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