95 lines
2.3 KiB
TypeScript
95 lines
2.3 KiB
TypeScript
import { EventEmitter } from 'eventemitter3';
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import * as ReconnectingWebsocket from 'reconnecting-websocket';
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import CONFIG from '../config';
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/**
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* Misskey stream connection
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*/
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export default class Connection extends EventEmitter {
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private state: string;
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private buffer: any[];
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private socket: ReconnectingWebsocket;
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constructor(endpoint, params?) {
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super();
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//#region BIND
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this.onOpen = this.onOpen.bind(this);
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this.onClose = this.onClose.bind(this);
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this.onMessage = this.onMessage.bind(this);
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this.send = this.send.bind(this);
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this.close = this.close.bind(this);
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//#endregion
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this.state = 'initializing';
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this.buffer = [];
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const host = CONFIG.apiUrl.replace('http', 'ws');
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const query = params
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? Object.keys(params)
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.map(k => encodeURIComponent(k) + '=' + encodeURIComponent(params[k]))
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.join('&')
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: null;
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this.socket = new ReconnectingWebsocket(`${host}/${endpoint}${query ? '?' + query : ''}`);
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this.socket.addEventListener('open', this.onOpen);
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this.socket.addEventListener('close', this.onClose);
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this.socket.addEventListener('message', this.onMessage);
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}
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/**
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* Callback of when open connection
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*/
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private onOpen() {
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this.state = 'connected';
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this.emit('_connected_');
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// バッファーを処理
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const _buffer = [].concat(this.buffer); // Shallow copy
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this.buffer = []; // Clear buffer
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_buffer.forEach(message => {
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this.send(message); // Resend each buffered messages
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});
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}
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/**
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* Callback of when close connection
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*/
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private onClose() {
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this.state = 'reconnecting';
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this.emit('_closed_');
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}
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/**
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* Callback of when received a message from connection
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*/
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private onMessage(message) {
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try {
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const msg = JSON.parse(message.data);
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if (msg.type) this.emit(msg.type, msg.body);
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} catch (e) {
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// noop
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}
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}
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/**
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* Send a message to connection
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*/
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public send(message) {
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// まだ接続が確立されていなかったらバッファリングして次に接続した時に送信する
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if (this.state != 'connected') {
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this.buffer.push(message);
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return;
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}
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this.socket.send(JSON.stringify(message));
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}
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/**
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* Close this connection
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*/
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public close() {
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this.socket.removeEventListener('open', this.onOpen);
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this.socket.removeEventListener('message', this.onMessage);
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}
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}
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