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export default class OcsManagerApi {
constructor(url) {
this._url = url;
this._websocket = null;
this._callback = new Map();
this._autoReconnect = false;
}
get callback() {
return this._callback;
}
get isConnected() {
return (this._websocket && this._websocket.readyState === 1) ? true : false;
}
async connect() {
return new Promise((resolve, reject) => {
if (!this.isConnected) {
this._websocket = new WebSocket(this._url);
this._autoReconnect = true;
this._websocket.addEventListener('open', () => {
resolve(true);
});
this._websocket.addEventListener('message', (event) => {
// console.log(event);
const message = event.data ? JSON.parse(event.data) : {};
if (message.func && this._callback.has(message.func)) {
const callback = this._callback.get(message.func);
callback(message);
}
});
this._websocket.addEventListener('close', () => {
if (this._autoReconnect) {
setTimeout(() => {
this._websocket = null;
this.connect();
}, 3000);
}
});
this._websocket.addEventListener('error', () => {
this._websocket = null;
reject(new Error('WebSocket connection error'));
});
}
else {
reject(new Error('WebSocket is already connected'));
}
});
}
async disconnect() {
return new Promise((resolve, reject) => {
if (this.isConnected) {
this._autoReconnect = false;
this._websocket.addEventListener('close', () => {
this._websocket = null;
resolve(true);
});
this._websocket.close();
}
else {
reject(new Error('WebSocket is not connected'));
}
});
}
async send(func, data = [], id = '') {
return new Promise((resolve, reject) => {
id = id || this._generateId();
if (this.isConnected) {
this._websocket.send(JSON.stringify({
id: id,
func: func,
data: data
}));
resolve(id);
}
else {
reject(new Error('WebSocket is not connected'));
}
});
}
async sendSync(func, data = [], id = '') {
return new Promise((resolve, reject) => {
id = id || this._generateId();
let webSocket = new WebSocket(this._url);
webSocket.addEventListener('open', () => {
webSocket.send(JSON.stringify({
id: id,
func: func,
data: data
}));
});
webSocket.addEventListener('message', (event) => {
const message = event.data ? JSON.parse(event.data) : {};
if (message.id && message.id === id) {
webSocket.close();
resolve(message);
}
});
webSocket.addEventListener('close', () => {
webSocket = null;
});
webSocket.addEventListener('error', () => {
webSocket = null;
reject(new Error(`WebSocket connection error (id: ${id})`));
});
});
}
_generateId() {
const length = 16;
const strings = '0123456789'
+ 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+ 'abcdefghijklmnopqrstuvwxyz';
const stringArray = strings.split('');
let randomString = '';
for (let i = 0; i < length; i++) {
randomString += stringArray[Math.floor(Math.random() * stringArray.length)];
}
return randomString;
}
}