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grafana/public/app/core/live/live_srv.ts

132 lines
2.9 KiB

import _ from 'lodash';
import config from 'app/core/config';
import { Observable } from 'rxjs/Observable';
export class LiveSrv {
conn: any;
observers: any;
initPromise: any;
constructor() {
this.observers = {};
}
getWebSocketUrl() {
const l = window.location;
return (l.protocol === 'https:' ? 'wss://' : 'ws://') + l.host + config.appSubUrl + '/ws';
}
getConnection() {
if (this.initPromise) {
return this.initPromise;
}
if (this.conn && this.conn.readyState === 1) {
return Promise.resolve(this.conn);
}
this.initPromise = new Promise((resolve, reject) => {
console.log('Live: connecting...');
this.conn = new WebSocket(this.getWebSocketUrl());
this.conn.onclose = evt => {
console.log('Live: websocket onclose', evt);
reject({ message: 'Connection closed' });
this.initPromise = null;
setTimeout(this.reconnect.bind(this), 2000);
};
this.conn.onmessage = evt => {
this.handleMessage(evt.data);
};
this.conn.onerror = evt => {
this.initPromise = null;
reject({ message: 'Connection error' });
console.log('Live: websocket error', evt);
};
this.conn.onopen = evt => {
console.log('opened');
this.initPromise = null;
resolve(this.conn);
};
});
return this.initPromise;
}
handleMessage(message) {
message = JSON.parse(message);
if (!message.stream) {
console.log('Error: stream message without stream!', message);
return;
}
const observer = this.observers[message.stream];
if (!observer) {
this.removeObserver(message.stream, null);
return;
}
observer.next(message);
}
reconnect() {
// no need to reconnect if no one cares
if (_.keys(this.observers).length === 0) {
return;
}
console.log('LiveSrv: Reconnecting');
this.getConnection().then(conn => {
_.each(this.observers, (value, key) => {
this.send({ action: 'subscribe', stream: key });
});
});
}
send(data) {
this.conn.send(JSON.stringify(data));
}
addObserver(stream, observer) {
this.observers[stream] = observer;
this.getConnection().then(conn => {
this.send({ action: 'subscribe', stream: stream });
});
}
removeObserver(stream, observer) {
console.log('unsubscribe', stream);
delete this.observers[stream];
this.getConnection().then(conn => {
this.send({ action: 'unsubscribe', stream: stream });
});
}
subscribe(streamName) {
console.log('LiveSrv.subscribe: ' + streamName);
return Observable.create(observer => {
this.addObserver(streamName, observer);
return () => {
this.removeObserver(streamName, observer);
};
});
// return this.init().then(() => {
// this.send({action: 'subscribe', stream: name});
// });
}
}
const instance = new LiveSrv();
export { instance as liveSrv };