import net const ( test_port = 45123 ) fn handle_conn(mut c net.TcpConn) { for { mut buf := []byte{len: 100, init: 0} read := c.read(mut buf) or { println('Server: connection dropped') return } c.write(buf[..read]) or { println('Server: connection dropped') return } } } fn echo_server(mut l net.TcpListener) ? { for { mut new_conn := l.accept() or { continue } go handle_conn(mut new_conn) } return none } fn echo() ? { mut c := net.dial_tcp('127.0.0.1:$test_port') ? defer { c.close() or { } } data := 'Hello from vlib/net!' c.write_string(data) ? mut buf := []byte{len: 4096} read := c.read(mut buf) ? assert read == data.len for i := 0; i < read; i++ { assert buf[i] == data[i] } println('Got "$buf.bytestr()"') return none } fn test_tcp() { mut l := net.listen_tcp(test_port) or { panic(err) } go echo_server(mut l) echo() or { panic(err) } l.close() or { } }