-
-
Save JoshuaChi/6f888f2edf51df459805c525ce65037c to your computer and use it in GitHub Desktop.
Golang实现自定义TCP协议
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
```go | |
package main | |
import ( | |
"bufio" | |
"bytes" | |
"encoding/binary" | |
"fmt" | |
"io" | |
) | |
type Package struct { | |
Version [2]int8 | |
Length int16 | |
Data []byte | |
} | |
func (p *Package) String() string { | |
return fmt.Sprintf("Version:%d Length:%d Data:%s", p.Version, p.Length, p.Data) | |
} | |
// 打包 | |
func (p *Package) Pack(writer io.Writer) { | |
binary.Write(writer, binary.BigEndian, p.Version) | |
binary.Write(writer, binary.BigEndian, p.Length) | |
binary.Write(writer, binary.BigEndian, p.Data) | |
} | |
// 解包 | |
func (p *Package) Unpack(r io.Reader) { | |
binary.Read(r, binary.BigEndian, &p.Version) | |
binary.Read(r, binary.BigEndian, &p.Length) | |
if p.Length > 0 { | |
p.Data = make([]byte, p.Length) | |
} | |
binary.Read(r, binary.BigEndian, &p.Data) | |
} | |
func main() { | |
pkg := &Package{ | |
Version: [2]int8{'V', 1}, | |
Data: []byte("ABCDEFGHIJK"), | |
} | |
pkg.Length = int16(len(pkg.Data)) | |
buf := new(bytes.Buffer) | |
pkg.Pack(buf) | |
pkg.Pack(buf) | |
pkg.Pack(buf) | |
// scanner | |
scanner := bufio.NewScanner(buf) | |
scanner.Split(func(data []byte, atEOF bool) (advance int, token []byte, err error) { | |
if !atEOF && data[0] == 'V' { | |
if len(data) > 4 { // 2字节版本号+2字节数据长度,最少4字节 | |
length := int16(0) // 数据包长度 | |
binary.Read(bytes.NewReader(data[2:4]), binary.BigEndian, &length) // 第3-4字节为数据包长度 | |
if int(length)+4 <= len(data) { // 数据已经读完了,但是产生了粘包现象 | |
return int(length) + 4, data[:int(length)+4], nil | |
} | |
} | |
} | |
return | |
}) | |
for scanner.Scan() { | |
pack := new(Package) | |
pack.Unpack(bytes.NewReader(scanner.Bytes())) | |
fmt.Println(pkg) | |
} | |
if err := scanner.Err(); err != nil { | |
fmt.Printf("error:%s", err) | |
} | |
} | |
``` |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment