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05_echo_server.go
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05_echo_server.go
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package main
import (
"fmt"
"net"
)
func startServer(port string) {
// Listen function creates servers,
// listening for incoming connections.
ln, err := net.Listen("tcp", port)
if err != nil {
panic(err)
}
defer ln.Close()
fmt.Println("Listening on", port)
for {
// Listen for an incoming connection.
conn, err := ln.Accept()
if err != nil {
panic(err)
}
go handleRequests(conn)
}
}
// Handles incoming requests.
func handleRequests(conn net.Conn) {
fmt.Printf("Received from %s → %s\n", conn.RemoteAddr(), conn.LocalAddr())
buf := make([]byte, 5) // read max 5 characters
if _, err := conn.Read(buf); err != nil {
panic(err)
}
conn.Write([]byte("received message: " + string(buf) + "\n"))
conn.Close()
}
func main() {
const port = ":8080"
startServer(port)
}
/*
$ echo "Hello server" | nc localhost 8080
Received from 127.0.0.1:58405 → 127.0.0.1:8080
Received from 127.0.0.1:58406 → 127.0.0.1:8080
Received from 127.0.0.1:58407 → 127.0.0.1:8080
Received from 127.0.0.1:58408 → 127.0.0.1:8080
Received from 127.0.0.1:58409 → 127.0.0.1:8080
...
*/