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lib/src/http/kernel/module/MountWebSocketRouteHTTPModu...

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import {Injectable, Inject} from '../../../di'
import {HTTPKernelModule} from '../HTTPKernelModule'
import {HTTPKernel} from '../HTTPKernel'
import {Request} from '../../lifecycle/Request'
import {Routing} from '../../../service/Routing'
import {ActivatedRoute} from '../../routing/ActivatedRoute'
import {Logging} from '../../../service/Logging'
import {apiEvent, error} from '../../response/api'
import {Bus, WebSocketBus} from '../../../support/bus'
import {WebSocketCloseEvent} from '../../lifecycle/WebSocketCloseEvent'
/**
* HTTP kernel middleware that tries to find a registered route matching the request's
* path and creates an ActivatedRoute instance from it, limited to websocket handling
* routes.
*/
@Injectable()
export class MountWebSocketRouteHTTPModule extends HTTPKernelModule {
public readonly executeWithBlockingWriteback = true
@Inject()
protected readonly routing!: Routing
@Inject()
protected readonly logging!: Logging
public static register(kernel: HTTPKernel): void {
kernel.register(this).before()
}
public async apply(request: Request): Promise<Request> {
const route = this.routing.match('ws', request.path)
if ( route ) {
this.logging.verbose(`Mounting activated WebSocket route: ${request.path} -> ${route}`)
const activated = <ActivatedRoute<unknown, unknown[]>> request.make(ActivatedRoute, route, request.path)
request.registerSingletonInstance<ActivatedRoute<unknown, unknown[]>>(ActivatedRoute, activated)
} else {
this.logging.debug(`No matching WebSocket route found for: ${request.method} -> ${request.path}`)
// Send an error response on the socket to the client
const ws = request.make<WebSocketBus>(WebSocketBus)
await ws.push(apiEvent(error('Endpoint is not a configured socket listener.')))
// Then, terminate the request & socket connections
await request.make<Bus>(Bus).push(new WebSocketCloseEvent())
request.response.blockingWriteback(true)
}
return request
}
}