@nestjs/websockets/web-sockets-controller.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.WebSocketsController = void 0;
const shared_utils_1 = require("@nestjs/common/utils/shared.utils");
const metadata_scanner_1 = require("@nestjs/core/metadata-scanner");
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const constants_1 = require("./constants");
const invalid_socket_port_exception_1 = require("./errors/invalid-socket-port.exception");
const gateway_metadata_explorer_1 = require("./gateway-metadata-explorer");
const compare_element_util_1 = require("./utils/compare-element.util");
class WebSocketsController {
    constructor(socketServerProvider, config, contextCreator) {
        this.socketServerProvider = socketServerProvider;
        this.config = config;
        this.contextCreator = contextCreator;
        this.metadataExplorer = new gateway_metadata_explorer_1.GatewayMetadataExplorer(new metadata_scanner_1.MetadataScanner());
    }
    connectGatewayToServer(instance, metatype, moduleKey) {
        const options = Reflect.getMetadata(constants_1.GATEWAY_OPTIONS, metatype) || {};
        const port = Reflect.getMetadata(constants_1.PORT_METADATA, metatype) || 0;
        if (!Number.isInteger(port)) {
            throw new invalid_socket_port_exception_1.InvalidSocketPortException(port, metatype);
        }
        this.subscribeToServerEvents(instance, options, port, moduleKey);
    }
    subscribeToServerEvents(instance, options, port, moduleKey) {
        const nativeMessageHandlers = this.metadataExplorer.explore(instance);
        const messageHandlers = nativeMessageHandlers.map(({ callback, message, methodName }) => ({
            message,
            methodName,
            callback: this.contextCreator.create(instance, callback, moduleKey, methodName),
        }));
        const observableServer = this.socketServerProvider.scanForSocketServer(options, port);
        this.assignServerToProperties(instance, observableServer.server);
        this.subscribeEvents(instance, messageHandlers, observableServer);
    }
    subscribeEvents(instance, subscribersMap, observableServer) {
        const { init, disconnect, connection, server } = observableServer;
        const adapter = this.config.getIoAdapter();
        this.subscribeInitEvent(instance, init);
        this.subscribeConnectionEvent(instance, connection);
        this.subscribeDisconnectEvent(instance, disconnect);
        const handler = this.getConnectionHandler(this, instance, subscribersMap, disconnect, connection);
        adapter.bindClientConnect(server, handler);
    }
    getConnectionHandler(context, instance, subscribersMap, disconnect, connection) {
        const adapter = this.config.getIoAdapter();
        return (...args) => {
            const [client] = args;
            connection.next(args);
            context.subscribeMessages(subscribersMap, client, instance);
            const disconnectHook = adapter.bindClientDisconnect;
            disconnectHook &&
                disconnectHook.call(adapter, client, () => disconnect.next(client));
        };
    }
    subscribeInitEvent(instance, event) {
        if (instance.afterInit) {
            event.subscribe(instance.afterInit.bind(instance));
        }
    }
    subscribeConnectionEvent(instance, event) {
        if (instance.handleConnection) {
            event
                .pipe(operators_1.distinctUntilChanged((prev, curr) => compare_element_util_1.compareElementAt(prev, curr, 0)))
                .subscribe((args) => instance.handleConnection(...args));
        }
    }
    subscribeDisconnectEvent(instance, event) {
        if (instance.handleDisconnect) {
            event
                .pipe(operators_1.distinctUntilChanged())
                .subscribe(instance.handleDisconnect.bind(instance));
        }
    }
    subscribeMessages(subscribersMap, client, instance) {
        const adapter = this.config.getIoAdapter();
        const handlers = subscribersMap.map(({ callback, message }) => ({
            message,
            callback: callback.bind(instance, client),
        }));
        adapter.bindMessageHandlers(client, handlers, data => rxjs_1.from(this.pickResult(data)).pipe(operators_1.mergeAll()));
    }
    async pickResult(defferedResult) {
        const result = await defferedResult;
        if (result && shared_utils_1.isFunction(result.subscribe)) {
            return result;
        }
        if (result instanceof Promise) {
            return rxjs_1.from(result);
        }
        return rxjs_1.of(result);
    }
    assignServerToProperties(instance, server) {
        for (const propertyKey of this.metadataExplorer.scanForServerHooks(instance)) {
            Reflect.set(instance, propertyKey, server);
        }
    }
}
exports.WebSocketsController = WebSocketsController;