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Opening Multiple WebSocket Streams with Ethereum
Introduction
In this article, we will explore how to open multiple WebSocket streams using the Ethereum blockchain API. We will use the Binance WebSocket API as an example, but the principles can be applied to other exchanges and APIs.
Prerequisites
Before starting, ensure that you have:
- A basic understanding of WebSockets and the Ethereum blockchain.
- The necessary permissions and access rights to the Binance API (Binance provides a free API key for personal use).
- Familiarity with JavaScript programming language.
Getting Started with WebSocket Streams
To open multiple WebSocket streams, we will create an array of symbols to watch and then iterate over this array to establish new connections for each symbol.
Step 1: Define the Binance API URL
First, let’s define the Binance API URL:
const binanceApiUrl = '
Step 2: Get the Symbol Symbols
Next, we need to get a list of available symbols on the Binance API. We can do this by using the GET /klines endpoint with a specific symbol (e.g., symbol=X). For our example, let’s assume X is Ethereum:
const symbol = 'ETH';
const apiUrl = binanceApiUrl + '/' + symbol;
Step 3: Create an Array of Symbols
Now, we’ll create an array to hold the symbols for which we want to establish WebSocket streams. We can use a for...in loop or the Array.prototype.forEach() method:
const symbols = Object.keys(getSymbol());
const apiUrls = symbols.map(symbol => ${apiUrl}/${symbol});
Step 4: Establish WebSocket Streams
To open a WebSocket stream for each symbol, we’ll create an array of WebSocket connections using the 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: Iterate Over Symbols and Establish Connections
Now, we’ll iterate over the array of symbols and establish connections for each symbol:
symbols.forEach(symbol => {
wsConnections[symbol]((data) => {
if (data[0].d > 0.0001) { // Ignore empty data points
console.log(data[0].d);
// Handle incoming data here
// For example, let's simulate some event handling:
// handleEvent(data[0].d); // Replace with your actual event handling code
}
});
});
Example Code
Here is the complete code snippet:
function getSymbol() {
return ['ETH', 'BNB']; // Example 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);
});
symbols.forEach(symbol => {
wsConnections[symbol]((data) => {
if (data[0].d > 0.0001) { // Ignore empty data points
console.log(data[0].d);
handleEvent(data[0].d); // Replace with your actual event handling code
}
});
});
setInterval(() => {}, 10000); // Establish new connections every second
}
Conclusion
In this article, we have demonstrated how to open multiple WebSocket streams using the Ethereum blockchain API. By following these steps and adapting them to your specific use case, you can create a robust and scalable system for streaming data from Binance or other APIs.