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// @flow
import SockJS from 'sockjs-client';
import Stomp from 'webstomp-client';
import type { Client, Frame, Options, Subscription } from 'webstomp-client';
const DEFAULT_DEBUG_OPTIONS = {
debug: process.env.NODE_ENV !== 'production',
};
export type Callback<T> = (value?: T) => void;
export type UnsubscribeFn = () => void;
export type SubscribeFn<T> = (callback: Callback<T>) => UnsubscribeFn;
export class JsonStompClient {
client: Client;
constructor(client: Client) {
this.client = client;
}
connect(headers: Object = {}): Promise<Frame> {
return new Promise((resolve, reject) => {
this.client.connect(headers, resolve, reject);
});
}
subscribe<T>(path: string, callback: Callback<T>): UnsubscribeFn {
const socketSubscription: Subscription = this.client.subscribe(path, (frame: Frame) => {
// not all frames have a JSON body
const value: T = frame && JsonStompClient.parseBody(frame);
callback(value);
});
return () => socketSubscription.unsubscribe();
}
static parseBody<T>(frame: Frame): T | void {
try {
return frame.body && JSON.parse(frame.body);
} catch (jsonParseError) {
throw new Error('Cannot parse websocket message as JSON: ' + jsonParseError.message);
}
}
subscriber<T>(path: string): SubscribeFn<T> {
return (callback: Callback<T>) => this.subscribe(path, callback);
}
send(url: string, body?: Object) {
const strBody = body ? JSON.stringify(body) : '';
this.client.send(url, strBody);
}
}
function createStompClient(url: string, options: Options = {}): Client {
const optionsWithDebug = Object.assign({}, DEFAULT_DEBUG_OPTIONS, options);
return Stomp.over(new SockJS(url), optionsWithDebug);
}
export function createJsonStompClient(url: string, options: Options = {}): JsonStompClient {
return new JsonStompClient(createStompClient(url, options));
}
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