148 lines
3.8 KiB
TypeScript
148 lines
3.8 KiB
TypeScript
export interface Message {
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uuid?: string; // to be assigned by
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// connecting to server
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requestingServerConnection?: boolean;
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// mailbox
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requestingMailboxSetup?: boolean;
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requestedMailbox?: string;
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deletingMailbox?: string;
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assignedMailboxId?: string; // sent by server
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connectedMailboxId?: string; // sent by server
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deletedMailbox?: string; // sent by server
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// subscribing to channel
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subscribeChannel?: string;
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unsubscribeChannel?: string;
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subscribed?: boolean; // sent by server
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// sending message
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messageChannel?: string;
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messageBody?: string;
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// confirming message
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confirmingMessageReceived?: boolean;
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}
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export default class UDNFrontend {
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ws: WebSocket | undefined;
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// HANDLERS
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private connectionHandler = () => { };
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private disconnectionHandler = () => { };
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private messageHandler = (data: Message) => { };
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private mailboxHandler = (mailboxId: string) => { };
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private mailboxConnectionHandler = (mailboxId: string) => { };
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private mailboxDeleteHandler = (mailboxId: string) => { };
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// INIT
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set onconnect(handler: () => void) {
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this.connectionHandler = handler;
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}
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set ondisconnect(handler: () => void) {
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this.disconnectionHandler = handler;
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}
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set onmessage(handler: (data: Message) => void) {
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this.messageHandler = handler;
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}
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set onmailboxcreate(handler: (mailboxId: string) => void) {
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this.mailboxHandler = handler;
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}
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set onmailboxconnect(handler: (mailboxId: string) => void) {
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this.mailboxConnectionHandler = handler;
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}
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set onmailboxdelete(handler: (mailboxId: string) => void) {
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this.mailboxDeleteHandler = handler;
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}
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// UTILITY METHODS
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private send(messageObject: Message): boolean {
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if (this.ws == undefined) return false;
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if (this.ws.readyState != 1) return false;
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const messageString = JSON.stringify(messageObject);
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this.ws.send(messageString);
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return true;
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}
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// PUBLIC METHODS
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// connection
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connect(address: string): void {
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try {
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this.disconnect();
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this.ws = new WebSocket(address);
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this.ws.addEventListener("open", this.connectionHandler);
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this.ws.addEventListener("close", this.disconnectionHandler);
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this.ws.addEventListener("message", (message) => {
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const dataString = message.data.toString();
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const data = JSON.parse(dataString);
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if (data.assignedMailboxId) {
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return this.mailboxHandler(data.assignedMailboxId);
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} else if (data.connectedMailboxId) {
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return this.mailboxConnectionHandler(data.connectedMailboxId);
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} else if (data.deletedMailbox) {
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return this.mailboxDeleteHandler(data.deletedMailbox);
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} else {
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this.send({ uuid: data.uuid, confirmingMessageReceived: true });
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this.messageHandler(data);
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}
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});
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} catch (error) {
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console.error(error);
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}
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}
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disconnect(): void {
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this.ws?.close();
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}
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// message
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sendMessage(channel: string, body: string): boolean {
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const messageObject = {
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messageChannel: channel,
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messageBody: body,
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};
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return this.send(messageObject);
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}
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// subscription
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subscribe(channel: string): boolean {
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const messageObject = {
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subscribeChannel: channel,
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};
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return this.send(messageObject);
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}
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unsubscribe(channel: string): boolean {
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const messageObject = {
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unsubscribeChannel: channel,
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};
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return this.send(messageObject);
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}
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// mailbox
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requestMailbox(): boolean {
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const messageObject = {
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requestingMailboxSetup: true,
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};
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return this.send(messageObject);
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}
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connectMailbox(mailboxId: string): boolean {
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const messageObject = {
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requestedMailbox: mailboxId,
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};
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return this.send(messageObject);
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}
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deleteMailbox(mailboxId: string): boolean {
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const messageObject = {
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deletingMailbox: mailboxId,
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};
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return this.send(messageObject);
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}
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}
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