GO語(yǔ)言如何手動(dòng)處理TCP粘包詳解

package server
import (
 "net"
 "bufio"
 "ftj-data-synchro/protocol"
 "golang.org/x/text/transform"
 "golang.org/x/text/encoding/simplifiedchinese"
 "io/ioutil"
 "bytes"
 "ftj-data-synchro/logic"
 "fmt"
 "strconv"
)
/*
 客戶(hù)端結(jié)構(gòu)體
 */
type Client struct {
 DeviceID string  //客戶(hù)端連接的唯標(biāo)志
 Conn  net.Conn  //連接
 reader *bufio.Reader //讀取
 writer *bufio.Writer //輸出
 Data  []byte  //接收數(shù)據(jù)
}
func NewClient(conn *net.TCPConn) *Client {
 reader := bufio.NewReaderSize(conn, 10240)
 writer := bufio.NewWriter(conn)
 c := Client{Conn:conn, reader:reader, writer:writer}
 return c
}
/**
 數(shù)據(jù)讀?。ㄕ嘲幚恚?
 */
func (this *Client)read() {
 for {
  var data []byte
  var err error
  //讀取指令頭 返回輸入流的前4個(gè)字節(jié)，不會(huì)移動(dòng)讀取位置
  data, err = this.reader.Peek(4)
  if len(data) == 0 || err != nil {
   continue
  }
  //返回緩沖中現(xiàn)有的可讀取的字節(jié)數(shù)
  var byteSize = this.reader.Buffered()
  fmt.Printf("讀取字節(jié)長(zhǎng)度：%d\n", byteSize)
  //生成一個(gè)字節(jié)數(shù)組，大小為緩沖中可讀字節(jié)數(shù)
  data = make([]byte, byteSize)
  //讀取緩沖中的數(shù)據(jù)
  this.reader.Read(data)
  fmt.Printf("讀取字節(jié)：%d\n", data)
  //保存到新的緩沖區(qū)
  for _, v := range data {
   this.Data = append(this.Data, v)
  }
  if len(this.Data)  4 {
   //數(shù)據(jù)包緩沖區(qū)清空
   this.Data = []byte{}
   fmt.Printf("非法數(shù)據(jù)，無(wú)指令頭...\n")
   continue
  }
  data, err = protocol.HexBytesToBytes(this.Data[:4])
  instructHead, _ := strconv.ParseUint(string(data), 16, 16)
  //指令頭效驗(yàn)
  if uint16(instructHead) != 42330 {
   fmt.Printf("非法數(shù)據(jù)\n")
   //數(shù)據(jù)包緩沖區(qū)清空
   this.Data = []byte{}
   continue
  }
  data = this.Data[:protocol.HEADER_SIZE]
  var p = protocol.Decode(data)
  fmt.Printf("消息體長(zhǎng)度：%d\n", p.Len)
  var bodyLength = len(this.Data)  
  /**
   判斷數(shù)據(jù)包緩沖區(qū)的大小是否小于協(xié)議請(qǐng)求頭中數(shù)據(jù)包大小
   如果小于，等待讀取下一個(gè)客戶(hù)端數(shù)據(jù)包，否則對(duì)數(shù)據(jù)包解碼進(jìn)行業(yè)務(wù)邏輯處理
   */
  if int(p.Len) > len(this.Data) - protocol.HEADER_SIZE {
   fmt.Printf("body體長(zhǎng)度：%d,讀取的body體長(zhǎng)度：%d\n", p.Len, bodyLength)
   continue
  }
  fmt.Printf("實(shí)際處理字節(jié)：%v\n", this.Data)
  p = protocol.Decode(this.Data)
  //邏輯處理
  go this.logicHandler(p)
  //數(shù)據(jù)包緩沖區(qū)清空
  this.Data = []byte{}
 }
}

type Client struct {
 DeviceID string  //客戶(hù)端連接的唯標(biāo)志
 Conn  net.Conn  //連接
 reader *bufio.Reader //讀取
 writer *bufio.Writer //輸出
 Data  []byte  //接收數(shù)據(jù)
}