86 lines
2.3 KiB
TypeScript
86 lines
2.3 KiB
TypeScript
// TYPES
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import { SubscriptionMap } from "./subscriptionMap";
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import { WS } from "./index";
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import { guardStringNotEmpty } from "./utility";
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// requests
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export interface IncomingMessage {
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// subscribing to channel
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subscribeChannel?: string;
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unsubscribeChannel?: string;
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//sending message
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messageChannel?: string;
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messageBody?: string;
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}
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// TRACKING
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const subscriptions = new SubscriptionMap();
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export function trackSubscription(ws: WS, channel: string): void {
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subscriptions.set(ws, channel);
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confirmSubscription(ws, channel);
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}
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export function removeSubscription(ws: WS, channel: string): void {
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subscriptions.delete(ws, channel);
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confirmSubscription(ws, channel);
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}
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export function forgetConnection(ws: WS): void {
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const channels = subscriptions.getChannelList(ws);
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channels?.forEach((channel) => {
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subscriptions.delete(ws, channel);
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});
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}
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// PROCESS MESSAGE
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export function processMessage(ws: WS, messageString: string): void {
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const messageObject: IncomingMessage = parseMessage(messageString);
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guardStringNotEmpty(messageObject.subscribeChannel, (subscribeChannel) => {
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trackSubscription(ws, subscribeChannel);
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});
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guardStringNotEmpty(
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messageObject.unsubscribeChannel,
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(unsubscribeChannel) => {
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removeSubscription(ws, unsubscribeChannel);
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}
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);
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guardStringNotEmpty(
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messageObject.messageChannel == "string",
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(messageChannel) => {
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if (!messageObject.messageBody) return;
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sendMessage(messageChannel, messageObject.messageBody);
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}
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);
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}
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// MESSAGING
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export function stringifyMessage(messageObject: Object): string {
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return JSON.stringify(messageObject);
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}
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export function parseMessage(messageString: string): Object {
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return JSON.parse(messageString);
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}
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export function sendMessage(channel: string, body: string): void {
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const messageObject = { channel, body };
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const messageString = stringifyMessage(messageObject);
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const subscribers = subscriptions.getClientList(channel);
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subscribers?.forEach((ws) => ws.send(messageString));
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}
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function confirmSubscription(ws: WS, channel: string): void {
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const messageObject = {
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channel: channel,
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subscribed: subscriptions.getChannelList(ws) ? true : false,
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};
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const messageString = stringifyMessage(messageObject);
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console.log(messageString);
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ws.send(messageString);
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}
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