Ethereum: binance websocket not responding to ping

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Ethereum WebSocket Connection Issues with Binance

As a developer building applications on the Ethereum blockchain, it is essential to understand how to establish connections to external services such as APIs. In this article, we will explore an issue that can occur when connecting to a Binance WebSocket endpoint using gorilla/websocket and identify potential causes.

The problem: Binance WebSocket connection is not responding

When setting up the connection with the Binance WebSocket endpoint, it seems to work as expected, thanks to the following lines of code:

ws, err := websocket.NewWebSocket("wss://apis.binance.com/1/ws", 443)
if err != nil {
log.Fatal(err)
}

However, when writing a ping control message and waiting for a response using the pongHandler method, the connection does not respond:

func main() {
// Set up the Binance WebSocket endpoint
ws, err := websocket.NewWebSocket("wss://apis.binance.com/1/ws", 443)
if err != nil {
log.Fatal(err)
}
// Configure the pong handler to respond with a ping message
ws.PongHandler = func(w, msg, r *websocket.Message) error {
fmt.Printf("Ping received from %s\n", ws.URL)
return websocket.Response(w, &websocket.Response{}{Type: "pings", MessageId: 1})
}
// Connect to the WebSocket endpoint
err := ws.Connect()
if err != nil {
log.Fatal(err)
}
// Send a ping control message and wait for a response
go func() {
msg := &websocket.Message{}
msg.Type = "ping"
ws.Send(msg)
select {
case resp, ok := <-ws.PingHandlerMsgs:
if !ok {
panic("Connection failed")
}
// Log the received message
fmt.Printf("Received ping from %s\n", resp.URL)
case err := <-wsErrChan:
log.Println(err)
}
}()
}

After analyzing the code, we can identify a few potential issues:

• Timeout: The Connect() function does not return immediately after establishing the connection, which can cause the WebSocket to time out if there is a problem with the initial handshake or connection establishment.

• Lack of connection monitoring: After configuring the pong handler and establishing the connection to the WebSocket endpoint, we do not monitor the connection status regularly. This can result in a «Connection failed» error when trying to send ping control messages without checking for errors.

Debugging steps

To resolve this issue, try the following steps:

• Check connection status: Add a «select» statement after connecting to the WebSocket endpoint and check if it returns any error messages.

• Check ping handler method: Make sure the «pongHandler» method is configured correctly and handles ping control messages as expected.

• Monitor error channels: Add error channels to detect any unexpected errors that may occur during connection establishment or data transfer.

By following these steps, you should be able to identify and resolve your Binance WebSocket connection not responding issue.