send a binary json message to a tcp server in go

To send a binary JSON message to a TCP server in Go, you can use the encoding/json package to marshal your JSON data into a binary format, and then use the net package to establish a connection to the server and send the message.

Here's an example code snippet that demonstrates the process:

main.go
package main

import (
    "encoding/binary"
    "encoding/json"
    "net"
)

type MyMessage struct {
    SomeField string
    AnotherField int
}

func main() {
    // Create a new instance of the message you want to send
    myMessage := MyMessage{"hello", 123}

    // Marshal the message into binary format
    binaryData, err := json.Marshal(myMessage)
    if err != nil {
        panic(err)
    }

    // Establish a connection to the TCP server
    conn, err := net.Dial("tcp", "SERVER_ADDRESS:PORT")
    if err != nil {
        panic(err)
    }
    defer conn.Close()

    // Send the binary data to the server
    err = binary.Write(conn, binary.LittleEndian, uint32(len(binaryData)))
    if err != nil {
        panic(err)
    }
    _, err = conn.Write(binaryData)
    if err != nil {
        panic(err)
    }

    // Wait for the server to respond (optional)
    response := make([]byte, 1024)
    n, err := conn.Read(response)
    if err != nil {
        panic(err)
    }
    println(string(response[:n]))
}
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In this code, we first define a struct MyMessage that represents the JSON data we want to send. We then create an instance of that struct with some dummy data.

Next, we marshal that data into binary format using the json.Marshal function. This gives us a byte slice that we can send over the wire.

We then establish a connection to the server using the net.Dial function. We use the binary.Write function to send the length of the binary data as a 4-byte unsigned integer in little-endian byte order, followed by the binary data itself.

Note that the server will need to know the format of the binary message so it can properly decode it. You should consult the server's documentation to determine the correct format.

Finally, we wait for a response from the server (optional) by reading from the connection and printing the response to the console.