@micro.ts/core/brokers/http/express/ExpressBroker.js

Microservice framework with Typescript

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ExpressBroker = void 0;
const HttpBroker_1 = require("../HttpBroker");
const express_1 = __importDefault(require("express"));
class ExpressBroker extends HttpBroker_1.HttpBroker {
    constructor() {
        super(...arguments);
        this.name = 'ExpressBroker';
        this.requestMapper = (r) => __awaiter(this, void 0, void 0, function* () {
            const action = {
                request: {
                    headers: r.headers,
                    body: r.body,
                    method: r.method,
                    qs: r.query,
                    params: r.params,
                    raw: r,
                    path: r.path,
                },
                connection: r.app,
            };
            return action;
        });
    }
    construct() {
        this.server = (0, express_1.default)();
    }
    paramWrapper(paramName) {
        return `:${paramName}`;
    }
    /**
     * Register single express handler
     * @param value
     * @param route
     * @param method
     */
    registerHandler(value, route, method) {
        this.server[method](route, (req, res) => __awaiter(this, void 0, void 0, function* () {
            const action = yield this.requestMapper(req);
            const handler = this.actionToRouteMapper(route, action, value);
            const result = yield handler(action);
            result.response = result.response || {};
            return this.respond(result, res);
        }));
    }
    /**
     * Respond to express request
     * @param result
     * @param ctx
     */
    respond(result, ctx) {
        const body = result.response.body || result.response.error;
        const headers = result.response.headers || {};
        ctx.status(result.response.statusCode || 200);
        Object.keys(headers).forEach((h) => {
            ctx.setHeader(h, headers[h]);
        });
        ctx.send(body);
    }
    start() {
        return __awaiter(this, void 0, void 0, function* () {
            this.registerRoutes();
            yield new Promise((resolve) => {
                this.server.listen(this.config.port, this.config.address, () => {
                    resolve();
                });
                this.server.on('error', (e) => this.handleConnectionError(e));
                this.server.on('close', (e) => this.handleConnectionError(e));
            });
            console.log(`Server listening on address ${this.config.address} and port ${this.config.port}`);
        });
    }
}
exports.ExpressBroker = ExpressBroker;