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我有一个角度为5的应用程序，rxjs WebsocketSubject发送jsonrpc消息。rxjs首先完成整个流式链接
这是我sendRequest将功能
sendRequest(request: Request): Promise<Response> {
console.log(request);
this.socket.next(JSON.stringify(request));
return this.onResponse().filter((response: Response) => {
return response.id === request.id;
}).first().toPromise().then((response) => {
console.log(response);
if (response.error) {
console.log('error');
throw new RpcError(response.error);
}
return response;
});
}
我使用的第一个（）运算符来完成这个过滤规则订阅。但是，onResponse（）直接来自我的WebSocketSubject，然后完成。
是否有解除原始主题的方法？
或者我应该创建一个新的Observale.create（...）？
写入的.filter函数会发生什么情况。它会持续到哪里？或者我必须在任何地方将其删除，以防止持续过滤呼叫？
编辑1
也是用这个没有帮助。
sendRequest(request: Request): Promise<Response> {
console.log(request);
this.socket.next(JSON.stringify(request));
return new Promise<Response>((resolve, reject) => {
const responseSubscription = this.onResponse().filter((response: Response) => {
console.log('filter');
return response.id === request.id;
}).subscribe((response: Response) => {
// responseSubscription.unsubscribe();
resolve(response);
});
});
}
如果我执行取消订阅整个websocketSubject被关闭。不要这样做每个请求准时记录'过滤器'！
编辑2
这里是整个websocketService我写
import {Injectable} from "@angular/core";
import {WebSocketSubject, WebSocketSubjectConfig} from "rxjs/observable/dom/WebSocketSubject";
import {MessageFactory, Notification, Request, Response, RpcError} from "../misc/jsonrpc";
import {ReplaySubject} from "rxjs/ReplaySubject";
import {Observable} from "rxjs/Observable";
import 'rxjs/add/operator/toPromise';
import 'rxjs/add/operator/filter';
import 'rxjs/add/operator/first';
import 'rxjs/add/observable/from';
export enum ConnectionState {
CONNECTED = "Connected",
CONNECTING = "Connecting",
CLOSING = "Closing",
DISCONNECTED = "Disconnected"
}
@Injectable()
export class WebsocketService {
private connectionState = new ReplaySubject<ConnectionState>(1);
private socket: WebSocketSubject<ArrayBuffer | Object>;
private config: WebSocketSubjectConfig;
constructor() {
console.log('ctor');
const protocol = location.protocol === 'https' ? 'wss' : 'ws';
const host = location.hostname;
const port = 3000; // location.port;
this.config = {
binaryType: "arraybuffer",
url: `${protocol}://${host}:${port}`,
openObserver: {
next:() => this.connectionState.next(ConnectionState.CONNECTED)
},
closingObserver: {
next:() => this.connectionState.next(ConnectionState.CLOSING)
},
closeObserver: {
next:() => this.connectionState.next(ConnectionState.DISCONNECTED)
},
resultSelector: (e: MessageEvent) => {
try {
if (e.data instanceof ArrayBuffer) {
return e.data;
} else {
return JSON.parse(e.data);
}
} catch (e) {
console.error(e);
return null;
}
}
};
this.connectionState.next(ConnectionState.CONNECTING);
this.socket = new WebSocketSubject(this.config);
this.connectionState.subscribe((state) => {
console.log(`WS state ${state}`);
});
}
onBinaryData(): Observable<ArrayBuffer> {
return this.socket.filter((message: any) => {
return message instanceof ArrayBuffer;
});
}
onMessageData(): Observable<Object> {
return this.socket.filter((message: any) => {
return !(message instanceof ArrayBuffer);
});
}
onResponse(): Observable<Response> {
return this.onMessageData().filter((message) => {
return MessageFactory.from(message).isResponse();
}).map((message): Response => {
return MessageFactory.from(message).toResponse();
});
}
sendRequest(request: Request): Promise<Response> {
console.log(request);
this.socket.next(JSON.stringify(request));
return new Promise<Response>((resolve, reject) => {
const responseSubscription = this.onResponse().filter((response: Response) => {
console.log('filter');
return response.id === request.id;
}).subscribe((response: Response) => {
responseSubscription.unsubscribe();
resolve(response);
});
});
}
sendNotification(notification: Notification): void {
this.socket.next(JSON.stringify(notification));
}
}
而结果在我的日志
Using Angular 5.0.2
websocket.service.ts:27 ctor
websocket.service.ts:69 WS state Connecting
core.js:3565 Angular is running in the development mode. Call enableProdMode() to enable the production mode.
websocket.service.ts:96 Request {jsonrpc: "2.0", id: "b042005c-5fbf-5ffc-fbd1-df68fae5882e", method: "appointment_list_get", params: undefined}
websocket.service.ts:69 WS state Connected
websocket.service.ts:103 filter
websocket.service.ts:69 WS state Disconnected
我需要找到一个方式decouplin g以某种方式从原始流中过滤掉我的过滤器。
为什么你甚至需要使用'first（）。toPromise（）。然后'？只需订阅像this.onResponse（）。filter（...）。subscribe（...）;'？ – martin
是的，但在我的理解（也许我错了）我必须清理订阅，我期待一个单一的结论。所以使用Promise应该没问题。但是.toPromise只能在Observalbe完成时解决 – Pascal
那么你现在的做法有什么问题？ – martin