Opening Multiple WebSocket Threads Using Ethereum

Introduction

In this article, we’ll look at how to open multiple WebSocket streams using the Ethereum blockchain API. As an example, we will use the Binance WebSocket API, but these principles can be applied to other exchanges and APIs.

Prerequisites

Before you start, make sure you have:

  • Basic understanding of WebSockets and the Ethereum blockchain.

  • Necessary permissions and access rights to the Binance API (Binance provides a free API key for personal use).

  • Getting to know the JavaScript programming language.

Getting Started with WebSocket Threads

To open multiple WebSocket threads, we’ll create an array of tracking tokens and then iterate over that array to establish new connections for each token.

Step 1: Determine Binance API URL

First, let’s define the Binance API URL:

const binanceApiUrl = '

Step 2: Get the character symbols

Next, we need to get a list of symbols available in the Binance API. This can be done using the GET /klines endpoint with a specific symbol (eg symbol=X). For our example, let’s assume that X is Ethereum:

const symbol = 'ETH';


const apiUrl = binanceApiUrl + '/' + symbol;

Step 3: Create the Character Matrix

Now we will create an array to store the tokens for which we want to establish WebSocket streams. We can use the for...in loop or the Array.prototype.forEach() method:

const symbols = Object.keys(getSymbol());


const apiUrls = symbols.map(symbol => ${apiUrl}/${symbol});

Step 4: Setting Up WebSocket Threads

To open a WebSocket stream for each token, we’ll create an array of WebSocket connections using a WebSocket object. We will use the setInterval() method to establish new connections:

const wsConnections = apiUrls.map(apiUrl => {


    const socket = new WebSocket(apiUrl);


    return () => socket.onmessage = (event) => console.log(event.data);


});

Step 5: Loop through symbols and make connections

Ethereum: How can I open multiple WebSocket streams

Now we will go through the symbol matrix and establish the connections for each symbol:

characters.forEach(character => {


    wsConnections[char]((data) => {


        if (data[0].d > 0.0001) { // Ignore empty data points


            console.log(data[0].d);


            // Process the received data here


            // For example, let's model an event handler:


            // process event(data[0].d); // Replace with actual event handling code


        }


    });


});

Example Code

Here’s the full code snippet:

function getSymbol() {


    return ['ETH', 'BNB']; // Examples of symbols


}




if ("WebSocket" in window) {


    const binanceApiUrl = '


    const symbol = 'ETH';


    const apiUrls = Object.keys(getSymbol());


    const wsConnections = apiUrls.map(apiUrl => {


        const socket = new WebSocket(apiUrl);


        return () => socket.onmessage = (event) => console.log(event.data);


    });




    characters.forEach(character => {


        wsConnections[char]((data) => {


            if (data[0].d > 0.0001) { // Ignore empty data points


                console.log(data[0].d);


                handleEvent(data[0].d); // Replace with actual event handling code


            }


        });


    });




    setInterval(() => {}, 10000); // Establish new connections every second


}

Conclusion

In this article, we demonstrated how to open multiple WebSocket streams using the Ethereum blockchain API. Following these steps and adapting them to your case. In a specific use case, you can create a reliable and scalable system to transfer data from Binance or other APIs.