Is there a method to monitor websocket? about go-agent

[willnewrelic]

Hi @ytkang

This library does not have instrumentation specific to gorilla websocket. Nonetheless, you can use this library to monitor your application: The API is designed to be flexible enough to instrument anything.

If you post a snippet example of how you are using gorilla websocket I would be happy to provide instrumentation direction.

[ytkang]

@willnewrelic
I used StartTransaction function for each request.
This is an example.

func readPump() {
	for {
		err := ReadLine(Conn)
		if err != nil {
			break
		}
	}
}

func ReadLine(conn *websocket.Conn) (err error) {
	var r io.Reader
	err = nil
	_, r, err = conn.NextReader()
	if err != nil {
		fmt.Println("reader error ", err.Error())
		return err
	}
	nr := bufio.NewReader(r)
	for err == nil {
		message, readErr := nr.ReadSlice('\n')

		err = readErr
		if message != nil {
			processMessage(message)
		}
	}

	if err == io.EOF {
		err = nil
	}

	return err
}

func processMessage(message []byte) {
	req := Request{}
	err := req.UnmarshalJSON(message)

	if err == nil {
		var txn newrelic.Transaction = nil

		if NewRelicApp != nil {
			txn = NewRelicApp.StartTransaction(req.Path, nil, nil)
			defer txn.End()
		}

		f := getHandler(req.Path)
		if f != nil{
			f(req.Path, message, c, txn)
		}
	}
}

[willnewrelic]

Hi @ytkang

That code looks reasonable to me! You might want to create the transaction in the readPump for loop so that you can time all the time spent in ReadLine.

If you have more questions about instrumentation, please don't hesitate to open a support ticket.

[ytkang]

@willnewrelic yes, you're right. but I needed to check time for each line. It will be case by case.