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main.go
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main.go
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package main
import (
"encoding/binary"
"encoding/json"
"fmt"
"gopkg.in/yaml.v2"
)
func main() {
var messageID = 1
var header = map[string]interface{}{
"auth": "abc",
}
var payload = struct {
Username string `yaml:"user_name"`
}{Username: "tcpx"}
var e error
var lengthBuf = make([]byte, 4)
var messageIDBuf = make([]byte, 4)
binary.BigEndian.PutUint32(messageIDBuf, uint32(messageID))
var headerLengthBuf = make([]byte, 4)
var bodyLengthBuf = make([]byte, 4)
var headerBuf []byte
var bodyBuf []byte
headerBuf, e = json.Marshal(header)
if e != nil {
panic(e)
}
binary.BigEndian.PutUint32(headerLengthBuf, uint32(len(headerBuf)))
bodyBuf, e = yaml.Marshal(payload)
if e != nil {
panic(e)
}
binary.BigEndian.PutUint32(bodyLengthBuf, uint32(len(bodyBuf)))
var content = make([]byte, 0, 1024)
content = append(content, messageIDBuf...)
content = append(content, headerLengthBuf...)
content = append(content, bodyLengthBuf...)
content = append(content, headerBuf...)
content = append(content, bodyBuf...)
binary.BigEndian.PutUint32(lengthBuf, uint32(len(content)))
var packet = make([]byte, 0, 1024)
packet = append(packet, lengthBuf...)
packet = append(packet, content...)
fmt.Println(packet)
//[0 0 0 42 0 0 0 1 0 0 0 14 0 0 0 16 123 34 97 117 116 104 34 58 34 97 98 99 34 125 117 115 101 114 95 110 97 109 101 58 32 116 99 112 120 10]
}