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Ethereum WebSocket Connection Issues with Binance
As a developer building applications on the Ethereum blockchain, it is crucial to understand how to establish connections to external services, such as APIs. In this article, we will examine an issue that can occur when connecting to the Binance WebSocket endpoint using « gorilla/websocket » and identify potential causes.
Issue: Binance WebSocket Connection Not Responding
When setting up a connection with the Binance WebSocket endpoint, it appears to be working as expected, thanks to the following lines of code:
`go
WS, Err:= WebSocket.newWebSocket("wss://apis.binance.com/1/ws", 443)
if it fails! = zero {
log.fatal (error)
}
When writing a ping control message and waiting for a response using the "Pongandler" method, the connection does not respond:
gofunc main() {
// Configure the Binance WebSocket endpoint
WS, Err:= WebSocket.newWebSocket("wss://apis.binance.com/1/ws", 443)
if it fails! = zero {
log.fatal (error)
}
// Configure the Pong handler to respond to ping messages
ws.pongHandler = func (w, msg, r *websocket.message) crcy {
fmt.printf ("ping received from %s \ n", ws.url)
return websocket.Response (w and websocket.response {} {type: "pings", messageId: 1})
}
// Connect to the WebSocket endpoint
err:=ws.connect()
if error! = zero {
log.fatal (error)
}
// Send a ping control message and wait for a response
merge func() {
MSG:=&WebSocket.Message {}
msg.type = "ping"
Ws.send (MSG)
Select {
Case or case, OK: = <-ws.pingHandLermsgs:
if! Okay {
Panic ("Connection failed")
}
// log the received message
fmt.printf ("ping received from %s\n", resp.url)
Case Err: = <-wserrchan:
log.println(error)
}
} ()
}
After analyzing the code, we can identify several potential problems:
- Timeout: The connect()
function does not return immediately after establishing a connection, which can cause a timeout if there is a problem with the handshake or the initial connection.
- Lack of connection monitoring: After configuring the Pong handler and connecting to the WebSocket endpoint, we do not regularly monitor the connection status. This can lead to a "connection failed" error when trying to send ping control messages without error checking.
Troubleshooting Steps
To resolve this issue, try the following steps:
- Check the connection status: Add aselect
command after connecting to the WebSocket endpoint and check if it returns any error messages.
- Check the ping handling method: Make sure thePongandler` method is configured correctly and is handling 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 the issue with your Binance WebSocket connection not responding.