Created
March 2, 2018 08:52
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Golang实现自定义TCP协议
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```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) | |
} | |
} | |
``` |
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