npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

react-native-reconnecting-websocket

v2.0.0

Published

websocket module

Downloads

946

Readme

React-Native-Reconnecting-WebSocket

React native auto reconnect websocket extends WebSocketModule. API design referenced reconnecting-websocket.

🇨🇳中文文档

It is API compatible, so when you have:

var ws = new WebSocket('ws://....');

you can replace with:

import ReconnectingWebSocket from 'react-native-reconnecting-websocket'

var ws = new ReconnectingWebSocket('ws://....');

Less code, more exponential.

Install

npm i react-native-reconnecting-websocket

How reconnections occur

With the standard WebSocket API, the events you receive from the WebSocket instance are typically:

onopen
onmessage
onmessage
onmessage
onclose // At this point the WebSocket instance is dead.

With a ReconnectingWebSocket, after an onclose event is called it will automatically attempt to reconnect. In addition, a connection is attempted repeatedly (with a small pause) until it succeeds. So the events you receive may look something more like:

onopen
onmessage
onmessage
onmessage
onclose
// ReconnectingWebSocket attempts to reconnect
onopen
onmessage
onmessage
onmessage
onclose
// ReconnectingWebSocket attempts to reconnect
onopen
onmessage
onmessage
onmessage
onclose

This is all handled automatically for you by the library.

Parameters

var socket = new ReconnectingWebSocket(url, protocols, options);

url

  • The URL you are connecting to.
  • https://html.spec.whatwg.org/multipage/comms.html#network

protocols

  • Optional string or array of protocols per the WebSocket spec.
  • https://tools.ietf.org/html/rfc6455

options

  • Options (see below)

Options

Options can either be passed as the 3rd parameter upon instantiation or set directly on the object after instantiation:

var socket = new ReconnectingWebSocket(url, null, {reconnectInterval: 3000});

reconnectInterval

  • The number of milliseconds to delay before attempting to reconnect.
  • Accepts integer
  • Default: 1000

maxReconnectInterval

  • The maximum number of milliseconds to delay a reconnection attempt.
  • Accepts integer
  • Default: 30000

reconnectDecay

  • The rate of increase of the reconnect delay. Allows reconnect attempts to back off when problems persist.
  • Accepts integer or float
  • Default: 1.5

timeoutInterval

  • The maximum time in milliseconds to wait for a connection to succeed before closing and retrying.
  • Accepts integer
  • Default: 2000

maxReconnectAttempts

  • The maximum number of reconnection attempts that will be made before giving up. If null, reconnection attempts will be continue to be made forever.
  • Accepts integer or null.
  • Default: null

origin

  • Preserve deprecated backwards compatibility for the origin option

headers

  • Specifying origin as a WebSocket connection option is deprecated. Include it under headers instead
  • Accepts origin and Cookie
  • Example:
    WebSocket(url, '', { headers: { Cookie: 'key=value', origin: "https://secret-host.com" } });

Methods

ws.close(code?: number, reason?: string)

ws.send(data: string | ArrayBuffer | ArrayBufferView | Blob)

  • Transmits data to the server over the WebSocket connection.
  • Accepts @param data a text string, ArrayBuffer, ArrayBufferView or Blob

ws.ping()

  • Sending websocket ping/pong frame.
  • Some servers do not support it and need to be implemented manually, like How to add heartbeat?

ws.reconnect()

  • Additional public API method to refresh the connection if still open (close, re-open).
  • For example, if the app suspects bad data / missed heart beats, it can try to refresh.

See the more detail in [react-native/WebSocket.js@3982a2c6]

For example: How to add heartbeat?

  1. usual
import ReconnectingWebSocket from 'react-native-reconnecting-websocket'

const ws = new ReconnectingWebSocket("ws://...");

// ws listeners
ws.onopen = (e) => {
    console.log("onopen",e)
};
ws.onmessage = (evt) => {
    console.log("onmessage",JSON.parse(evt.data))
};
ws.onclose = (e) => {
    console.log("onclose",e)
};
ws.onerror = (e) => {
    console.log("onerror",e)
};

/*
 * listen reconnecting event (Powered by ReconnectingWebSocket)
 * @params reconnectAttempts 尝试重连的次数
 */
ws.onconnecting = (reconnectAttempts) => {
    console.log("onconnecting", reconnectAttempts)
}
  1. add heartbeat
ws.onopen = (e) => {
    // execute immediately!
    ws.send("heartbeat string");
    
    heartCheck.reset().start()
};

ws.onmessage = (evt) => {
    heartCheck.reset().start()
};

ws.onclose = () => {
    if(logout){//如果前端主动关闭(如退出登陆),不做处理

    }else {//如果服务器主动关闭,前端也需要重连时使用
        heartCheck.reset().start() 
    }
};

var heartCheck = {
    timeout: 10000,//default 10s
    timeoutObj: null,
    serverTimeoutObj: null,
    reset:function(){
        clearTimeout(this.timeoutObj);
        clearTimeout(this.serverTimeoutObj);
        return this;
    },
    start:function(){
        let self = this;
        this.timeoutObj = setTimeout(function(){
            if(ws.readyState === ws.OPEN){
              ws.send("heartbeat string");
            }
            self.serverTimeoutObj = setTimeout(function(){
                ws.reconnect();//本库提供
            }, self.timeout)
        }, this.timeout)
    }
}