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server.go
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server.go
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package main
import (
"flag"
"fmt"
"log"
"net"
)
var bindHost string
var bindPort string
// EchoServer will return a fixed size message(5 bytes) sent by the client
type EchoServer struct {
bindHost string
bindPort string
}
func newEchoServer(bindHost, bindPort string) *EchoServer {
return &EchoServer{
bindHost: bindHost,
bindPort: bindPort,
}
}
func (s *EchoServer) start() {
listener, err := net.Listen("tcp", fmt.Sprintf("%s:%s", bindHost, bindPort))
if err != nil {
log.Fatalln(err)
}
defer listener.Close()
log.Println("Start serving on", fmt.Sprintf("%s:%s", bindHost, bindPort))
for {
conn, err := listener.Accept()
if err != nil {
log.Println("Error accept", err)
} else {
go s.handleConnection(conn)
}
}
}
func (s *EchoServer) handleConnection(conn net.Conn) {
for {
readBuff := make([]byte, 5)
n, err := conn.Read(readBuff)
if err != nil {
log.Println(err)
return
}
// len("hello") == 5
if n != 5 {
log.Println("Recv", n, "bytes")
return
}
conn.Write(readBuff)
}
}
func main() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
flag.Parse()
server := newEchoServer(bindHost, bindPort)
server.start()
}
func init() {
flag.StringVar(&bindHost, "host", "127.0.0.1", "host")
flag.StringVar(&bindPort, "port", "4567", "port")
}