github.com/nginxinc/kubernetes-ingress@v1.12.5/tests/test-servers/tcp/main.go (about)

     1  package main
     2  
     3  import (
     4  	"flag"
     5  	"fmt"
     6  	"log"
     7  	"net"
     8  )
     9  
    10  func main() {
    11  	port := flag.String("port", "3333", "Port")
    12  	flag.Parse()
    13  
    14  	l, err := net.Listen("tcp", fmt.Sprintf(":%v", *port))
    15  	if err != nil {
    16  		log.Panicln(err)
    17  	}
    18  	defer l.Close()
    19  	log.Printf("listening to tcp connections at: :%v\n", *port)
    20  
    21  	for {
    22  		conn, err := l.Accept()
    23  		if err != nil {
    24  			log.Panicln(err)
    25  		}
    26  
    27  		go handleRequest(conn)
    28  	}
    29  }
    30  
    31  func handleRequest(conn net.Conn) {
    32  	log.Println("accepted new connection")
    33  
    34  	buf := make([]byte, 1024)
    35  	n, err := conn.Read(buf)
    36  	if err != nil {
    37  		log.Println("Error reading:", err.Error())
    38  		conn.Close()
    39  		return
    40  	}
    41  	instruction := string(buf[:n])
    42  	log.Printf("instruction:%q\n", instruction)
    43  	if instruction != "hold" {
    44  		defer conn.Close()
    45  		defer log.Println("closed connection")
    46  	}
    47  
    48  	response := conn.LocalAddr().String()
    49  	if instruction == "health" {
    50  		response = "healthy"
    51  	}
    52  
    53  	log.Printf("write data to connection: %v\n", response)
    54  
    55  	_, err = conn.Write([]byte(response))
    56  	if err != nil {
    57  		log.Printf("error writing to connection: %v", err)
    58  		return
    59  	}
    60  }