@eclipse-ditto/ditto-javascript-client-node/dist/node/src/node-websocket.js

Node.js(r) implementation of Eclipse Ditto JavaScript API.

"use strict";
/*!
 * Copyright (c) 2019 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.NodeWebSocketBuilder = exports.NodeWebSocket = void 0;
const auth_provider_1 = require("../../api/src/auth/auth-provider");
const WebSocket = require("ws");
/**
 * Converts a Map to a plain js object.
 *
 * @param aMap - the map to convert.
 * @return the plain js object.
 */
const mapToPlainObject = (aMap) => {
    const objects = [...aMap.entries()].map(([k, v]) => ({ [k]: v }));
    return Object.assign({}, ...objects);
};
/**
 * NodeJs implementation of a web socket requester.
 */
class NodeWebSocket {
    constructor(webSocket, webSocketUrl, handler, options) {
        this.webSocket = webSocket;
        this.webSocketUrl = webSocketUrl;
        this.handler = handler;
        this.options = options;
        this.connected = true;
        this.setHandles();
    }
    /**
     * Builds an instance of NodeWebSocket.
     *
     * @param url - The Url of the service.
     * @param handler - The handler that gets called for responses from the web socket.
     * @param authProviders - The auth providers to use.
     * @param agent - The proxy agent to use to establish the connection.
     * @return a Promise for the web socket connection.
     */
    static buildInstance(url, handler, authProviders, agent) {
        return new Promise(resolve => {
            const [authenticatedUrl, authenticatedHeaders] = auth_provider_1.authenticateWithUrlAndHeaders(url, new Map(), authProviders);
            const plainHeaders = mapToPlainObject(authenticatedHeaders);
            const options = {
                agent: NodeWebSocket.getProxyAgentForProtocol(url, agent),
                rejectUnauthorized: false,
                headers: plainHeaders
            };
            const plainUrl = authenticatedUrl.toString();
            const webSocket = new WebSocket(plainUrl, options);
            webSocket.on('open', () => {
                resolve(new NodeWebSocket(webSocket, plainUrl, handler, options));
            });
        });
    }
    static getProxyAgentForProtocol(url, agent) {
        if ('wss' === url.protocol) {
            return agent.proxyAgent;
        }
        return agent.httpProxyAgent;
    }
    executeCommand(request) {
        this.webSocket.send(request);
    }
    /**
     * Reestablishes a failed web socket connection.
     *
     * @param retry - The amount of time to wait to reconnect.
     * @return a Promise for the reestablished web socket connection.
     */
    reconnect(retry) {
        return new Promise((resolve, reject) => {
            this.webSocket = new WebSocket(this.webSocketUrl, this.options);
            this.webSocket.on('open', () => {
                this.connected = true;
                this.setHandles();
                resolve(this);
            });
            setTimeout(() => {
                if (this.connected) {
                    return;
                }
                if (retry <= 120000) {
                    console.log('Reconnect failed! Trying again!');
                    resolve(this.reconnect(retry * 2));
                }
                console.log('Reconnect failed!');
                reject('Reconnect failed: Timed out');
            }, retry);
        });
    }
    /**
     * Sets up the handler so it receives events from the web socket.
     */
    setHandles() {
        this.webSocket.on('message', data => {
            this.handler.handleInput(data.toString());
        });
        this.webSocket.on('close', () => {
            this.connected = false;
            this.handler.handleClose(Promise.resolve(this.reconnect(1000)));
        });
        this.webSocket.on('error', event => {
            this.handler.handleError(event.toString());
        });
    }
}
exports.NodeWebSocket = NodeWebSocket;
/**
 * Builder for the Node implementation of a web socket.
 */
class NodeWebSocketBuilder {
    constructor(agent) {
        this.agent = agent;
    }
    withHandler(handler) {
        return NodeWebSocket.buildInstance(this.dittoUrl, handler, this.authProviders, this.agent);
    }
    withConnectionDetails(url, authProviders) {
        this.dittoUrl = url;
        this.authProviders = authProviders;
        return this;
    }
}
exports.NodeWebSocketBuilder = NodeWebSocketBuilder;
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