97 lines
2.6 KiB
JavaScript
97 lines
2.6 KiB
JavaScript
"use strict";
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import { WebSocketStates, ReverseWebSocketStates } from './Utilities/WebSocketStates';
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import EventEmitter from "event-emitter-es6";
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class RippleLink extends EventEmitter
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{
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constructor(inSocketUrl, inBoardWindow)
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{
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super();
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this.socketUrl = inSocketUrl;
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this.boardWindow = inBoardWindow;
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this.settings = this.boardWindow.settings;
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// Create the websocket and commect to the server
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// Whether the link ot the nibri server is open or not
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this.linkOpen = false;
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// The underlying websocket
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this.websocket = new WebSocket(this.socketUrl, [ this.settings.WebsocketProtocol ]);
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// Attach some event listeners
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this.websocket.addEventListener("open", this.handleConnection.bind(this));
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this.websocket.addEventListener("message", this.handleMessage.bind(this));
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let closeHandler = this.handleDisconnection.bind(this);
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this.websocket.addEventListener("close", closeHandler);
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// Respond to heartbeats from the server
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this.on("Heartbeat", this.handleHeartbeat.bind(this));
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this.on("Error", this.handleErrorMessage.bind(this));
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// Close the socket correctly
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window.addEventListener("beforeunload", (function(event) {
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// Remove the event listener to avoid issues on refresh
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this.websocket.removeEventListener("close", closeHandler);
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this.websocket.close();
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}).bind(this));
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}
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handleConnection(event) {
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console.info("[ripple link] Established connection successfully.");
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this.linkOpen = true;
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// Tell everyone about it
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this.emit("connect", event);
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}
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handleDisconnection(event) {
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// If the link was already down, then ignore this phantom disconnection
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if(!this.linkOpen)
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return;
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console.error("[ripple link] Lost connection.");
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this.boardWindow.interface.setConnectedStatus(false);
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this.emit("disconnect", event);
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}
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handleMessage(event) {
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// Decode the message form the server
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var message = JSON.parse(event.data);
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console.debug(message.Event, message);
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// Pass it on to the board manager by triggering the appropriate event
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this.emit(message.Event, message);
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}
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handleErrorMessage(message) {
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console.error(message.Message);
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}
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/**
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* Replies to heartbeat messages from the server.
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*/
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handleHeartbeat(message) {
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// Reply with a heartbeat
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this.send({
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"Event": "Heartbeat"
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});
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}
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/**
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* Sends a message object to the server.
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*/
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send(message) {
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if(this.websocket.readyState !== WebSocketStates.ready)
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{
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console.error(`Attempt to send data on the RippleLink when it is not ready (state ${ReverseWebSocketStates[this.websocket.readyState]})`);
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return false;
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}
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this.websocket.send(JSON.stringify(message));
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return true;
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}
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}
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export default RippleLink;
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