@zodash/onion/lib/onion.js

simple onion model

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Onion = void 0;
const compose_1 = require("@zodash/compose");
class Onion {
    constructor() {
        this.middlewares = [];
    }
    use(middleware) {
        this.middlewares.push(middleware);
        return this;
    }
    callback() {
        if (!this.handler) {
            // the core handler
            this.use(this.handle());
            //
            const fn = compose_1.compose(...this.middlewares);
            this.handler = fn;
        }
        return async (input, output) => {
            const context = this.createContext(input, output);
            await this.handler(context);
            return context;
        };
    }
    async execute(input) {
        if (!this._callback) {
            this._callback = this.callback();
        }
        const output = {};
        const context = await this._callback(input, output);
        return context.output;
    }
    createContext(input, output) {
        return {
            input,
            output,
            state: {},
        };
    }
}
exports.Onion = Onion;