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v/examples/tcp_echo_server.v

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import net
// This file shows how a basic TCP echo server can be implemented using
// the `net` module. You can connect to the server by using netcat
// or telnet, in separate shells, for example:
// `nc 127.0.0.1 12345`
// `telnet 127.0.0.1 12345`
fn handle_connection(con net.Socket) {
peer_ip := con.peer_ip() or {
'0.0.0.0'
}
eprintln('${peer_ip:16} | new client connected')
defer {
eprintln('${peer_ip:16} | closing connection...')
con.close() or { }
}
con.send_string("Welcome to V's TCP Echo server.\n") or {
return
}
for {
line := con.read_line()
if line.len == 0 {
return
}
eprintln('${peer_ip:16} | received line: ' + line.trim_space())
con.send_string(line) or {
return
}
}
}
fn main() {
server_port := 12345
eprintln('Starting an echo server, listening on port: $server_port')
server := net.listen(server_port) or {
panic(err)
}
for {
con := server.accept() or {
server.close() or { }
panic(err)
}
go handle_connection(con)
}
}