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package netProgram
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import (
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"encoding/gob"
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"errors"
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"fmt"
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"io"
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"log"
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"math/rand"
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"net"
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"os"
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"sync"
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"time"
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)
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// 客户端
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func TcpClient() {
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// tcp服务端地址
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//serverAddress := "127.0.0.1:5678"
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// tcp协议类型
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serverAddress := "[::1]:5678" // IPv6
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//serverAddress := "127.0.0.1:5678" // IPv4
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// 模拟多客户端
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// 并发的客户端请求
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num := 10
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wg := sync.WaitGroup{}
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wg.Add(num)
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for i := 0; i < num; i++ {
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// 并发请求
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go func(wg *sync.WaitGroup) {
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defer wg.Done()
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// A. 建立连接
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conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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}(&wg)
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}
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wg.Wait()
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}
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func TcpTimeoutClient() {
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// tcp服务端地址
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serverAddress := "192.168.110.123:5678" // IPv6 4
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// 模拟多客户端
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// 并发的客户端请求
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num := 10
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wg := sync.WaitGroup{}
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wg.Add(num)
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for i := 0; i < num; i++ {
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// 并发请求
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go func(wg *sync.WaitGroup) {
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defer wg.Done()
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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}(&wg)
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}
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wg.Wait()
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}
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func TcpBacklogClient() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// 模拟多客户端
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// 并发的客户端请求
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num := 256
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wg := sync.WaitGroup{}
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wg.Add(num)
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for i := 0; i < num; i++ {
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// 并发请求
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go func(wg *sync.WaitGroup, no int) {
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defer wg.Done()
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("%d: connection is establish, client addr is %s\n", no, conn.LocalAddr())
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}(&wg, i)
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time.Sleep(30 * time.Millisecond)
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}
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wg.Wait()
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}
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func TcpClientRW() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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// B.从服务端接收数据，SerRead
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buf := make([]byte, 1024)
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rn, err := conn.Read(buf)
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if err != nil {
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log.Println(err)
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}
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log.Println("received from server data is:", string(buf[:rn]))
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// C.向服务器端发送数据，SerWrite
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wn, err := conn.Write([]byte("send some data from client" + "\n"))
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if err != nil {
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log.Println(err)
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}
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log.Printf("client write len is %d\n", wn)
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}
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func TcpWClient() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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//
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//select {}
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// 1. 阻塞Read
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//buf := make([]byte, 1024)
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//rn, err := conn.SerRead(buf)
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//if err != nil {
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// log.Println(err)
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//}
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//log.Println("received from server data is:", string(buf[:rn]))
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// 2. 循环读
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conn.SetReadDeadline(time.Now().Add(10 * time.Second))
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for {
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buf := make([]byte, 10)
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rn, err := conn.Read(buf)
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if err != nil {
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log.Println(err)
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break
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}
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log.Println("received from server data is:", string(buf[:rn]))
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}
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}
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func TcpClientRWConcurrency() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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wg := sync.WaitGroup{}
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// 并发的写
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wg.Add(1)
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go CliWrite(conn, &wg)
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// 并发的读
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wg.Add(1)
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go CliRead(conn, &wg)
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wg.Wait()
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}
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func CliWrite(conn net.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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for {
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// B.向客户端发送数据，SerWrite
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wn, err := conn.Write([]byte("send some data from client" + "\n"))
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if err != nil {
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log.Println(err)
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}
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log.Printf("client write len is %d\n", wn)
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time.Sleep(3 * time.Second)
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}
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}
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func CliRead(conn net.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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for {
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// C.从客户端接收数据，SerRead
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buf := make([]byte, 1024)
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rn, err := conn.Read(buf)
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if err != nil {
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log.Println(err)
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}
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log.Println("received from server data is:", string(buf[:rn]))
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}
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}
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func TcpClientFormat() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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//conn, err := net.Dial(tcp, serverAddress)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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wg := sync.WaitGroup{}
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// 接收端
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wg.Add(1)
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go CliReadFormat(conn, &wg)
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wg.Wait()
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}
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func CliReadFormat(conn net.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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for {
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// 从客户端接收数据
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// 接收到数据后，先解码
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// 传递的消息类型
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type Message struct {
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ID uint `json:"id,omitempty"`
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Code string `json:"code,omitempty"`
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Content string `json:"content,omitempty"`
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}
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message := Message{}
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// 1, JSON解码
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//// 创建解码器
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//decoder := json.NewDecoder(conn)
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//// 利用解码器进行解码
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//// 解码操作，从conn中读取内容，成功会将解码后的结果，赋值到message变量
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//if err := decoder.Decode(&message); err != nil {
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// log.Println(err)
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// continue
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//}
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//log.Println(message)
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// 2, GOB解码
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// 创建解码器
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decoder := gob.NewDecoder(conn)
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// 利用解码器进行解码
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// 解码操作，从conn中读取内容，成功会将解码后的结果，赋值到message变量
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if err := decoder.Decode(&message); err != nil {
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log.Println(err)
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continue
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}
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log.Println(message)
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}
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}
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// 短连接示例
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func TcpClientSort() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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wg := sync.WaitGroup{}
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// 接收端
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wg.Add(1)
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go CliReadSort(conn, &wg)
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wg.Wait()
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}
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func CliReadSort(conn net.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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// 传递的消息类型
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type Message struct {
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ID uint `json:"id,omitempty"`
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Code string `json:"code,omitempty"`
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Content string `json:"content,omitempty"`
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}
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message := Message{}
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for {
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// 从客户端接收数据
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// 接收到数据后，先解码
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// GOB解码
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// 创建解码器
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decoder := gob.NewDecoder(conn)
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// 利用解码器进行解码
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// 解码操作，从conn中读取内容，成功会将解码后的结果，赋值到message变量
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err := decoder.Decode(&message)
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// 错误 io.EOF 时，表示连接被给关闭
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if err != nil && errors.Is(err, io.EOF) {
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log.Println(err)
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log.Println("link was closed")
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break
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}
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log.Println(message)
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}
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}
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// 响应服务端的心跳检测
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func TcpClientHB() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A. 建立连接
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conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
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if err != nil {
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log.Println(err)
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return
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}
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// 保证关闭
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defer conn.Close()
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log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
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wg := sync.WaitGroup{}
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// 接收端
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wg.Add(1)
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go CliReadPing(conn, &wg)
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wg.Wait()
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}
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// 传递的消息类型
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type MessageHB struct {
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ID uint `json:"id,omitempty"`
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Code string `json:"code,omitempty"`
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Content string `json:"content,omitempty"`
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Time time.Time `json:"time,omitempty"`
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}
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func CliReadPing(conn net.Conn, wg *sync.WaitGroup) {
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defer wg.Done()
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// 传递的消息类型
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message := MessageHB{}
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for {
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// GOB解码
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decoder := gob.NewDecoder(conn)
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// 解码操作，从conn中读取内容，成功会将解码后的结果，赋值到message变量
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err := decoder.Decode(&message)
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// 错误 io.EOF 时，表示连接被给关闭
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if err != nil && errors.Is(err, io.EOF) {
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log.Println(err)
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break
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}
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// 判断是为为 ping 类型消息
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if message.Code == "PING-SERVER" {
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log.Println("receive ping from", conn.RemoteAddr())
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CliWritePong(conn, message)
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}
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}
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}
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func CliWritePong(conn net.Conn, pingMsg MessageHB) {
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pongMsg := MessageHB{
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ID: uint(rand.Int()),
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Code: "PONG-CLIENT",
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Content: fmt.Sprintf("pingID:%d", pingMsg.ID),
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Time: time.Now(),
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}
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// GOB, 二进制编码
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// 创建编码器
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encoder := gob.NewEncoder(conn)
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// 利用编码器进行编码
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// encode 成功后，会写入到conn，已经完成了conn.Write()
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if err := encoder.Encode(pongMsg); err != nil {
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log.Println(err)
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return
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}
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log.Println("pong was send to", conn.RemoteAddr())
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return
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}
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// 连接池使用
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func TcpClientPool() {
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// tcp服务端地址
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serverAddress := "127.0.0.1:5678" // IPv6 4
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// A，建立连接池
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pool, err := NewTcpPool(serverAddress, PoolConfig{
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Factory: &TcpConnFactory{},
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InitConnNum: 4,
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})
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if err != nil {
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log.Fatalln(err)
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}
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log.Println(pool, pool.Len())
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wg := sync.WaitGroup{}
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clientNum := 50
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wg.Add(clientNum)
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// B, 复用连接池中的连接
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for i := 0; i < clientNum; i++ {
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// goroutine 模拟独立的客户端
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go func(wg *sync.WaitGroup) {
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defer wg.Done()
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// 获取连接
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conn, err := pool.Get()
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if err != nil {
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log.Println(err)
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return
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}
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//log.Println(conn)
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// 回收连接
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|
pool.Put(conn)
|
|
|
}(&wg)
|
|
|
}
|
|
|
wg.Wait()
|
|
|
|
|
|
// 释放连接池
|
|
|
pool.Release()
|
|
|
log.Println(pool, pool.idleList, pool.Len())
|
|
|
}
|
|
|
|
|
|
// 粘包
|
|
|
func TcpClientSticky() {
|
|
|
// tcp服务端地址
|
|
|
serverAddress := "127.0.0.1:5678" // IPv6 4
|
|
|
|
|
|
// A. 建立连接
|
|
|
conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
|
|
|
//conn, err := net.Dial(tcp, serverAddress)
|
|
|
if err != nil {
|
|
|
log.Println(err)
|
|
|
return
|
|
|
}
|
|
|
// 保证关闭
|
|
|
defer conn.Close()
|
|
|
log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
|
|
|
|
|
|
// 从服务端接收数据，SerRead
|
|
|
buf := make([]byte, 1024)
|
|
|
for {
|
|
|
rn, err := conn.Read(buf)
|
|
|
if err != nil {
|
|
|
log.Println(err)
|
|
|
break
|
|
|
}
|
|
|
log.Println("received data:", string(buf[:rn]))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// 粘包,编解码器解决
|
|
|
func TcpClientCoder() {
|
|
|
// tcp服务端地址
|
|
|
serverAddress := "127.0.0.1:5678" // IPv6 4
|
|
|
|
|
|
// A. 建立连接
|
|
|
conn, err := net.DialTimeout(tcp, serverAddress, time.Second)
|
|
|
//conn, err := net.Dial(tcp, serverAddress)
|
|
|
if err != nil {
|
|
|
log.Println(err)
|
|
|
return
|
|
|
}
|
|
|
// 保证关闭
|
|
|
defer conn.Close()
|
|
|
log.Printf("connection is establish, client addr is %s\n", conn.LocalAddr())
|
|
|
|
|
|
// 从服务端接收数据，SerRead
|
|
|
// 创建解码器
|
|
|
decoder := NewDecoder(conn)
|
|
|
data := ""
|
|
|
i := 0
|
|
|
for {
|
|
|
// 错误 io.EOF 时，表示连接被给关闭
|
|
|
if err := decoder.Decode(&data); err != nil {
|
|
|
log.Println(err)
|
|
|
break
|
|
|
}
|
|
|
|
|
|
log.Println(i, "received data:", data)
|
|
|
i++
|
|
|
}
|
|
|
}
|
|
|
|
|
|
func TcpClientSpecial() {
|
|
|
// 1建立连接
|
|
|
// raddr remote addr，服务端的地址
|
|
|
raddr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:5678")
|
|
|
if err != nil {
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
// laddr, local addr, 客户端的地址，可以用于设置客户端的端口
|
|
|
tcpConn, err := net.DialTCP("tcp", nil, raddr)
|
|
|
if err != nil {
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
// 保证关闭
|
|
|
defer tcpConn.Close()
|
|
|
log.Printf("connection is establish, client addr is %s\n", tcpConn.LocalAddr())
|
|
|
|
|
|
// 2读写数据
|
|
|
buf := make([]byte, 1024)
|
|
|
for {
|
|
|
n, err := tcpConn.Read(buf)
|
|
|
if err != nil {
|
|
|
log.Println(err)
|
|
|
return
|
|
|
}
|
|
|
log.Println("receive len:", n)
|
|
|
log.Println("receive data:", string(buf[:n]))
|
|
|
}
|
|
|
}
|
|
|
|
|
|
func TcpFileClient() {
|
|
|
// 1建立连接
|
|
|
tcpConn, err := net.Dial("tcp", "192.168.50.131:5678")
|
|
|
if err != nil {
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
// 保证关闭
|
|
|
defer tcpConn.Close()
|
|
|
log.Printf("connection is establish, client addr is %s\n", tcpConn.LocalAddr())
|
|
|
|
|
|
// 1.获取文件信息
|
|
|
filename := "./data/Beyond.mp3"
|
|
|
// 打开文件
|
|
|
file, err := os.Open(filename)
|
|
|
if err != nil {
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
// 关闭文件
|
|
|
defer file.Close()
|
|
|
|
|
|
buf := make([]byte, 1024)
|
|
|
for {
|
|
|
// 读取文件内容
|
|
|
rn, err := file.Read(buf)
|
|
|
if err != nil {
|
|
|
// io.EOF 错误表示文件读取完毕
|
|
|
if err == io.EOF {
|
|
|
break
|
|
|
}
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
|
|
|
// 发送到服务端
|
|
|
if _, err := tcpConn.Write(buf[:rn]); err != nil {
|
|
|
log.Fatalln(err)
|
|
|
}
|
|
|
}
|
|
|
|
|
|
log.Println("file send complete.")
|
|
|
}
|
