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Deal with sticky tcp/socket packet in Golang

If you're dealing with a "sticky" TCP packet in Golang, there are a few steps you can take to resolve the issue. The first thing to do is to identify the source of the problem. Are you sending or receiving the sticky packet? Are you using the correct socket options?

Once you've identified the source of the problem, here are some steps you can take to resolve it:

Use the SetKeepAlive method on the net.TCPConn object to enable TCP keep-alives. This will allow the client and server to periodically check if the connection is still active, and will help prevent sticky packets from occurring.

Use the SetLinger method on the net.TCPConn object to specify the behavior of the socket when it is closed. This can help ensure that all pending data is sent and received before the socket is closed, which can help prevent sticky packets from occurring.

Use the SetNoDelay method on the net.TCPConn object to disable the Nagle algorithm. This algorithm can sometimes cause packets to be delayed, which can lead to sticky packets. Disabling the Nagle algorithm can help prevent this from happening.

Use the SetWriteBuffer and SetReadBuffer methods on the net.TCPConn object to increase the size of the socket's write and read buffers. This can help ensure that the socket has enough buffer space to handle the incoming and outgoing data, which can help prevent sticky packets from occurring.

If none of the above steps help, you may need to implement your own packet handling logic to ensure that sticky packets are properly handled. This can involve using a combination of the methods mentioned above, as well as implementing your own logic to handle sticky packets when they occur.

Here is an example of how to use SetKeepAlive() to deal with sticky TCP packets in Golang:

// Create a new TCP connection
conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
// handle error
}

// Enable keep-alive on the connection and set the probe interval to 5 seconds
err = conn.SetKeepAlive(true)
if err != nil {
// handle error
}

// Set the probe interval to 5 seconds
err = conn.SetKeepAlivePeriod(5 * time.Second)
if err != nil {
// handle error
}

// Send and receive data over the connection
// ...

// Close the connection when done
conn.Close()

In this example, we are using SetKeepAlivePeriod() to set the interval at which probes are sent to the remote host. This allows us to customize the behavior of the keep-alive option to suit our needs.

Another example of use packet encode:

import (
    "bufio"
    "encoding/binary"
    "io"
    "net"
)

func providerCallback(conn net.Conn) error {
    rdr := bufio.NewReader(conn)
    data := make([]byte, 0, 4*1024)
    for {
        n, err := io.ReadFull(rdr, data[:4])
        data = data[:n]
        if err != nil {
            if err == io.EOF {
                break
            }
            return err
        }
        dataLen := binary.BigEndian.Uint32(data)
        if uint64(dataLen) > uint64(cap(data)) {
            data = make([]byte, 0, dataLen)
        }
        n, err = io.ReadFull(rdr, data[:dataLen])
        data = data[:n]
        if err != nil {
            return err
        }

        process(data)
    }
    return nil
}

func process([]byte) {}

func Encode(message string) ([]byte, error) {
	var length = int32(len(message))
	var pkg = new(bytes.Buffer)

	err := binary.Write(pkg, binary.BigEndian, length)
	if err != nil {
		return nil, err
	}

	err = binary.Write(pkg, binary.BigEndian, []byte(message))
	if err != nil {
		return nil, err
	}
	return pkg.Bytes(), nil
}
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Discussion (1)

GolangWebDev
admin Dec 15, 2022 11:32 UTC

Here is a simple solution if you want to read all received data.

    connbuf := bufio.NewReader(c.m_socket)
    // Read the first byte and set the underlying buffer
    b, _ := connbuf.ReadByte() 
    if connbuf.Buffered() > 0 {
        var msgData []byte
        msgData = append(msgData, b)
        for connbuf.Buffered() > 0 {
            // read byte by byte until the buffered data is not empty
            b, err := connbuf.ReadByte()
            if err == nil {
                msgData = append(msgData, b)
            } else {
                log.Println("-------> unreadable caracter...", b)
            }
        }
        // msgData now contain the buffered data...
    }
``
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