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