慢开始:
拥塞避免:
\n
。demo/unpack/unpack.go
:
package unpack
import (
"encoding/binary"
"errors"
"io"
)
const Msg_Header = "12345678"
// Encode 消息编码
func Encode(bytesBuffer io.Writer, content string) error {
// 消息格式:msg_header + content_length + content
// 8+4+content_length
// 写入头部 Header
if err := binary.Write(bytesBuffer, binary.BigEndian, []byte(Msg_Header)); err != nil {
return err
}
// 写入内容长度
clen := int32(len([]byte(content)))
if err := binary.Write(bytesBuffer, binary.BigEndian, clen); err != nil {
return err
}
// 写入内容
if err := binary.Write(bytesBuffer, binary.BigEndian, []byte(content)); err != nil {
return err
}
return nil
}
// Decode 消息解码
func Decode(bytesBuffer io.Reader) (bodyBuf []byte, err error) {
// 读取头部
magicBuf := make([]byte, len(Msg_Header))
if _, err := io.ReadFull(bytesBuffer, magicBuf); err != nil {
return nil, err
}
if string(magicBuf) != Msg_Header {
return nil, errors.New("msg_header error")
}
// 读取内容长度
lengthBuf := make([]byte, 4)
if _, err := io.ReadFull(bytesBuffer, lengthBuf); err != nil {
return nil, err
}
// 读取内容
length := binary.BigEndian.Uint32(lengthBuf)
bodyBuf = make([]byte, length)
if _, err := io.ReadFull(bytesBuffer, bodyBuf); err != nil {
return nil, err
}
return bodyBuf, nil
}
demo/tcp_client/main.go
:
package main
import (
"fmt"
"gateway-demo/unpack/unpack"
"net"
)
func main() {
conn, err := net.Dial("tcp", "localhost:9090")
defer conn.Close()
if err != nil {
fmt.Printf("connect failed, err: %v\n", err)
return
}
unpack.Encode(conn, "hello world 0!!!")
}
demo/tcp_server/main.go
:
package main
import (
"fmt"
"gateway-demo/unpack/unpack"
"net"
)
func main() {
// simple tcp server
// 1. listen ip+port
listener, err := net.Listen("tcp", "0.0.0.0:9090")
if err != nil {
fmt.Printf("listen failed, err: %v\n", err)
return
}
// 2. accept client request
// 3. create goroutine for each request
for {
conn, err := listener.Accept()
if err != nil {
fmt.Printf("accept failed, err: %v\n", err)
continue
}
// create goroutine for each request
go process(conn)
}
}
func process(conn net.Conn) {
defer conn.Close()
for {
bt, err := unpack.Decode(conn)
if err != nil {
fmt.Printf("read from connect failed, err: %v\n", err)
break
}
str := string(bt)
fmt.Printf("receive from client, data: %v\n", str)
}
}
demo/udp_client/main.go
:
package main
import (
"fmt"
"net"
)
func main() {
// 1. 连接服务器
conn, err := net.DialUDP("udp", nil, &net.UDPAddr{
IP: net.IPv4(127, 0, 0, 1),
Port: 9090,
})
if err != nil {
fmt.Printf("connect failed, err: %v\n", err)
return
}
for i := 0; i < 100; i++ {
// 2. 发送数据
_, err := conn.Write([]byte("hello server!"))
if err != nil {
fmt.Printf("send data failed, err: %v\n", err)
return
}
// 3. 接收数据
result := make([]byte, 1024)
n, remoteAddr, err := conn.ReadFromUDP(result)
if err != nil {
fmt.Printf("receive data failed, err: %v\n", err)
return
}
fmt.Printf("receive from addr: %v, data: %v\n", remoteAddr, string(result[:n]))
}
}
demo/udp_server/main.go
:
package main
import (
"fmt"
"net"
)
func main() {
// 1. 监听服务器
listen, err := net.ListenUDP("udp", &net.UDPAddr{
IP: net.IPv4(0, 0, 0, 0),
Port: 9090,
})
if err != nil {
fmt.Printf("listen failed, err: %v\n", err)
return
}
// 2. 循环读取消息内容
for {
var data [1024]byte
n, addr, err := listen.ReadFromUDP(data[:])
if err != nil {
fmt.Printf("read udp failed from addr: %v, err: %v\n", addr, err)
break
}
go func() {
// todo sth
// 3 . 回复数据
fmt.Printf("addr: %v, data: %v, count: %v\n", addr, string(data[:n]), n)
_, err := listen.WriteToUDP([]byte("received success!"), addr)
if err != nil {
fmt.Printf("write udp failed, err: %v\n", err)
}
}()
}
}
demo/tcp_client/main.go
:
package main
import (
"bufio"
"fmt"
"net"
"os"
"strings"
)
func main() {
// 1. 连接服务器
conn, err := net.Dial("tcp", "localhost:9090")
if err != nil {
fmt.Printf("connect failed, err: %v\n", err)
}
defer conn.Close()
// 2. 读取命令行输入
inputReader := bufio.NewReader(os.Stdin)
for {
// 3. 一直读取直到读到 \n
input, err := inputReader.ReadString('\n')
if err != nil {
fmt.Printf("read from console failed, err: %v\n", err)
break
}
// 4. 读取Q时停止
trimmedInput := strings.TrimSpace(input)
if trimmedInput == "Q" {
break
}
// 5. 回复服务器信息
_, err = conn.Write([]byte(trimmedInput))
if err != nil {
fmt.Printf("send data failed, err: %v\n", err)
break
}
}
}
demo/tcp_server/main.go
:
package main
import (
"fmt"
"net"
)
func main() {
// 1. 监听端口
listener, err := net.Listen("tcp", "0.0.0.0:9090")
if err != nil {
fmt.Printf("listen failed, err: %v\n", err)
return
}
// 2. 建立套接字连接
for {
conn, err := listener.Accept()
if err != nil {
fmt.Printf("accept failed, err: %v\n", err)
continue
}
// 3. 创建处理协程
go process(conn)
}
}
func process(conn net.Conn) {
defer conn.Close()
for {
buf := make([]byte, 128)
n, err := conn.Read(buf)
if err != nil {
fmt.Printf("read from connect failed, err: %v\n", err)
break
}
fmt.Printf("receive from client, data: %v\n", string(buf[:n]))
}
}
demo/http_server/main.go
:
package main
import (
"log"
"net/http"
"time"
)
var (
Addr = ":1210"
)
func main() {
// 创建路由去
mux := http.NewServeMux()
// 设置路由规则
mux.HandleFunc("/bye", sayBye)
// 创建服务器
server := &http.Server{
Addr: Addr,
WriteTimeout: time.Second * 3,
Handler: mux,
}
// 监听端口并提供服务
log.Println("Starting httpserver at " + Addr)
log.Fatal(server.ListenAndServe())
}
func sayBye(w http.ResponseWriter, r *http.Request) {
time.Sleep(1 * time.Second)
w.Write([]byte("bye bye, this is httpserver"))
}
demo/http_client/main.go
:
package main
import (
"fmt"
"io"
"net"
"net/http"
"time"
)
func main() {
// 创建连接池
transport := &http.Transport{
DialContext: (&net.Dialer{
Timeout: 30 * time.Second, // 连接超时
KeepAlive: 30 * time.Second, // 长连接超时时间
}).DialContext,
MaxIdleConns: 100, // 最大空闲连接数
IdleConnTimeout: 90 * time.Second, // 空闲连接超时时间
TLSHandshakeTimeout: 10 * time.Second, // tls握手超时时间
ExpectContinueTimeout: 1 * time.Second, // 100-continue状态码超时时间
}
// 创建客户端
client := &http.Client{
Timeout: time.Second * 30, // 请求超时时间
Transport: transport,
}
// 请求数据
rsp, err := client.Get("http://127.0.0.1:1210/bye")
if err != nil {
panic(err)
}
defer rsp.Body.Close()
// 读取数据
b, err := io.ReadAll(rsp.Body)
if err != nil {
panic(err)
}
fmt.Println(string(b))
}
分段超时时间预览图: