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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 | 2x 2x 2x 1x 3x 3x 3x 1x 1x 3x 3x 3x 2x 1x 2x 2x 1x | import {
OnGatewayConnection,
OnGatewayDisconnect,
SubscribeMessage,
WebSocketGateway,
WebSocketServer,
WsResponse,
} from '@nestjs/websockets';
import { Subscription, tap, timer } from 'rxjs';
import { Server, WebSocket } from 'ws';
import { dianosticEventsGatewayPort, IUserCountEvent, TDiagData } from '../interfaces/diagnostics.interface';
import { AppDiagnosticsService } from '../services/diagnostics.service';
@WebSocketGateway(dianosticEventsGatewayPort, {
path: '/api/events',
transports: ['websocket'],
})
export class AppDiagnosticsGateway implements OnGatewayConnection, OnGatewayDisconnect {
/**
* Platform-specific server instance.
*/
@WebSocketServer()
protected server?: Server;
private dynamicDataSub?: Subscription;
constructor(private readonly service: AppDiagnosticsService) {}
/**
* Sends an event to a client.
* @param client web socket client
* @param data stringified event data
*/
public sendEvent(client: WebSocket, data: string) {
client.send(data);
}
/**
* Broadcasts an event to all connected users.
*/
public broadcastEvent<T = Record<string, unknown>>(event: T): void {
Eif (typeof this.server !== 'undefined') {
const clients = this.server.clients.values();
for (const client of clients) {
const stringifiedEvent = JSON.stringify(event);
this.sendEvent(client, stringifiedEvent);
}
}
}
private sendClientChangeEvent(): void {
Eif (typeof this.server !== 'undefined') {
const event: IUserCountEvent = {
event: 'users',
data: [
{
name: 'active',
value: this.server.clients.size,
},
],
};
this.broadcastEvent(event);
}
}
public async handleConnection() {
this.sendClientChangeEvent();
}
public async handleDisconnect() {
this.sendClientChangeEvent();
}
@SubscribeMessage('start-diag')
public startSendingDiagnosticEvents() {
if (typeof this.dynamicDataSub === 'undefined') {
const timeout = 5000;
this.dynamicDataSub = timer(0, timeout)
.pipe(
tap(() => {
const event: WsResponse<TDiagData> = {
event: 'dynamic',
data: this.service.dynamic(),
};
this.broadcastEvent(event);
}),
)
.subscribe();
}
}
@SubscribeMessage('stop-diag')
public stopSendingDiagnosticEvents() {
Iif (typeof this.dynamicDataSub !== 'undefined') {
this.dynamicDataSub.unsubscribe();
this.dynamicDataSub = void 0;
}
}
}
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