From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/old/vlib/net/tcp.v | 381 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 381 insertions(+)
 create mode 100644 v_windows/v/old/vlib/net/tcp.v

(limited to 'v_windows/v/old/vlib/net/tcp.v')

diff --git a/v_windows/v/old/vlib/net/tcp.v b/v_windows/v/old/vlib/net/tcp.v
new file mode 100644
index 0000000..9a11db9
--- /dev/null
+++ b/v_windows/v/old/vlib/net/tcp.v
@@ -0,0 +1,381 @@
+module net
+
+import time
+
+const (
+	tcp_default_read_timeout  = 30 * time.second
+	tcp_default_write_timeout = 30 * time.second
+)
+
+[heap]
+pub struct TcpConn {
+pub mut:
+	sock TcpSocket
+mut:
+	write_deadline time.Time
+	read_deadline  time.Time
+	read_timeout   time.Duration
+	write_timeout  time.Duration
+}
+
+pub fn dial_tcp(address string) ?&TcpConn {
+	addrs := resolve_addrs_fuzzy(address, .tcp) ?
+
+	// Very simple dialer
+	for addr in addrs {
+		mut s := new_tcp_socket(addr.family()) ?
+		s.connect(addr) or {
+			// Connection failed
+			s.close() or { continue }
+			continue
+		}
+
+		return &TcpConn{
+			sock: s
+			read_timeout: net.tcp_default_read_timeout
+			write_timeout: net.tcp_default_write_timeout
+		}
+	}
+	// failed
+	return error('dial_tcp failed')
+}
+
+pub fn (mut c TcpConn) close() ? {
+	c.sock.close() ?
+}
+
+// write_ptr blocks and attempts to write all data
+pub fn (mut c TcpConn) write_ptr(b &byte, len int) ?int {
+	$if trace_tcp ? {
+		eprintln(
+			'>>> TcpConn.write_ptr | c.sock.handle: $c.sock.handle | b: ${ptr_str(b)} len: $len |\n' +
+			unsafe { b.vstring_with_len(len) })
+	}
+	unsafe {
+		mut ptr_base := &byte(b)
+		mut total_sent := 0
+		for total_sent < len {
+			ptr := ptr_base + total_sent
+			remaining := len - total_sent
+			mut sent := C.send(c.sock.handle, ptr, remaining, msg_nosignal)
+			if sent < 0 {
+				code := error_code()
+				if code == int(error_ewouldblock) {
+					c.wait_for_write() ?
+					continue
+				} else {
+					wrap_error(code) ?
+				}
+			}
+			total_sent += sent
+		}
+		return total_sent
+	}
+}
+
+// write blocks and attempts to write all data
+pub fn (mut c TcpConn) write(bytes []byte) ?int {
+	return c.write_ptr(bytes.data, bytes.len)
+}
+
+// write_string blocks and attempts to write all data
+pub fn (mut c TcpConn) write_string(s string) ?int {
+	return c.write_ptr(s.str, s.len)
+}
+
+pub fn (mut c TcpConn) read_ptr(buf_ptr &byte, len int) ?int {
+	mut res := wrap_read_result(C.recv(c.sock.handle, voidptr(buf_ptr), len, 0)) ?
+	$if trace_tcp ? {
+		eprintln('<<< TcpConn.read_ptr  | c.sock.handle: $c.sock.handle | buf_ptr: ${ptr_str(buf_ptr)} len: $len | res: $res')
+	}
+	if res > 0 {
+		return res
+	}
+	code := error_code()
+	if code == int(error_ewouldblock) {
+		c.wait_for_read() ?
+		res = wrap_read_result(C.recv(c.sock.handle, voidptr(buf_ptr), len, 0)) ?
+		$if trace_tcp ? {
+			eprintln('<<< TcpConn.read_ptr  | c.sock.handle: $c.sock.handle | buf_ptr: ${ptr_str(buf_ptr)} len: $len | res: $res')
+		}
+		return socket_error(res)
+	} else {
+		wrap_error(code) ?
+	}
+	return none
+}
+
+pub fn (mut c TcpConn) read(mut buf []byte) ?int {
+	return c.read_ptr(buf.data, buf.len)
+}
+
+pub fn (mut c TcpConn) read_deadline() ?time.Time {
+	if c.read_deadline.unix == 0 {
+		return c.read_deadline
+	}
+	return none
+}
+
+pub fn (mut c TcpConn) set_read_deadline(deadline time.Time) {
+	c.read_deadline = deadline
+}
+
+pub fn (mut c TcpConn) write_deadline() ?time.Time {
+	if c.write_deadline.unix == 0 {
+		return c.write_deadline
+	}
+	return none
+}
+
+pub fn (mut c TcpConn) set_write_deadline(deadline time.Time) {
+	c.write_deadline = deadline
+}
+
+pub fn (c &TcpConn) read_timeout() time.Duration {
+	return c.read_timeout
+}
+
+pub fn (mut c TcpConn) set_read_timeout(t time.Duration) {
+	c.read_timeout = t
+}
+
+pub fn (c &TcpConn) write_timeout() time.Duration {
+	return c.write_timeout
+}
+
+pub fn (mut c TcpConn) set_write_timeout(t time.Duration) {
+	c.write_timeout = t
+}
+
+[inline]
+pub fn (mut c TcpConn) wait_for_read() ? {
+	return wait_for_read(c.sock.handle, c.read_deadline, c.read_timeout)
+}
+
+[inline]
+pub fn (mut c TcpConn) wait_for_write() ? {
+	return wait_for_write(c.sock.handle, c.write_deadline, c.write_timeout)
+}
+
+pub fn (c &TcpConn) peer_addr() ?Addr {
+	mut addr := Addr{
+		addr: AddrData{
+			Ip6: Ip6{}
+		}
+	}
+	mut size := sizeof(Addr)
+	socket_error(C.getpeername(c.sock.handle, voidptr(&addr), &size)) ?
+	return addr
+}
+
+pub fn (c &TcpConn) peer_ip() ?string {
+	return c.peer_addr() ?.str()
+}
+
+pub fn (c &TcpConn) addr() ?Addr {
+	return c.sock.address()
+}
+
+pub fn (c TcpConn) str() string {
+	s := c.sock.str().replace('\n', ' ').replace('  ', ' ')
+	return 'TcpConn{ write_deadline: $c.write_deadline, read_deadline: $c.read_deadline, read_timeout: $c.read_timeout, write_timeout: $c.write_timeout, sock: $s }'
+}
+
+pub struct TcpListener {
+pub mut:
+	sock TcpSocket
+mut:
+	accept_timeout  time.Duration
+	accept_deadline time.Time
+}
+
+pub fn listen_tcp(family AddrFamily, saddr string) ?&TcpListener {
+	s := new_tcp_socket(family) ?
+
+	addrs := resolve_addrs(saddr, family, .tcp) ?
+
+	// TODO(logic to pick here)
+	addr := addrs[0]
+
+	// cast to the correct type
+	alen := addr.len()
+	bindres := C.bind(s.handle, voidptr(&addr), alen)
+	socket_error(bindres) ?
+	socket_error(C.listen(s.handle, 128)) ?
+	return &TcpListener{
+		sock: s
+		accept_deadline: no_deadline
+		accept_timeout: infinite_timeout
+	}
+}
+
+pub fn (mut l TcpListener) accept() ?&TcpConn {
+	addr := Addr{
+		addr: AddrData{
+			Ip6: Ip6{}
+		}
+	}
+	size := sizeof(Addr)
+	mut new_handle := C.accept(l.sock.handle, voidptr(&addr), &size)
+	if new_handle <= 0 {
+		l.wait_for_accept() ?
+		new_handle = C.accept(l.sock.handle, voidptr(&addr), &size)
+		if new_handle == -1 || new_handle == 0 {
+			return error('accept failed')
+		}
+	}
+	new_sock := tcp_socket_from_handle(new_handle) ?
+	return &TcpConn{
+		sock: new_sock
+		read_timeout: net.tcp_default_read_timeout
+		write_timeout: net.tcp_default_write_timeout
+	}
+}
+
+pub fn (c &TcpListener) accept_deadline() ?time.Time {
+	if c.accept_deadline.unix != 0 {
+		return c.accept_deadline
+	}
+	return error('invalid deadline')
+}
+
+pub fn (mut c TcpListener) set_accept_deadline(deadline time.Time) {
+	c.accept_deadline = deadline
+}
+
+pub fn (c &TcpListener) accept_timeout() time.Duration {
+	return c.accept_timeout
+}
+
+pub fn (mut c TcpListener) set_accept_timeout(t time.Duration) {
+	c.accept_timeout = t
+}
+
+pub fn (mut c TcpListener) wait_for_accept() ? {
+	return wait_for_read(c.sock.handle, c.accept_deadline, c.accept_timeout)
+}
+
+pub fn (mut c TcpListener) close() ? {
+	c.sock.close() ?
+}
+
+pub fn (c &TcpListener) addr() ?Addr {
+	return c.sock.address()
+}
+
+struct TcpSocket {
+pub:
+	handle int
+}
+
+fn new_tcp_socket(family AddrFamily) ?TcpSocket {
+	handle := socket_error(C.socket(family, SocketType.tcp, 0)) ?
+	mut s := TcpSocket{
+		handle: handle
+	}
+	// TODO(emily):
+	// we shouldnt be using ioctlsocket in the 21st century
+	// use the non-blocking socket option instead please :)
+
+	// TODO(emily):
+	// Move this to its own function on the socket
+	s.set_option_int(.reuse_addr, 1) ?
+	$if windows {
+		t := u32(1) // true
+		socket_error(C.ioctlsocket(handle, fionbio, &t)) ?
+	} $else {
+		socket_error(C.fcntl(handle, C.F_SETFL, C.fcntl(handle, C.F_GETFL) | C.O_NONBLOCK)) ?
+	}
+	return s
+}
+
+fn tcp_socket_from_handle(sockfd int) ?TcpSocket {
+	mut s := TcpSocket{
+		handle: sockfd
+	}
+	// s.set_option_bool(.reuse_addr, true)?
+	s.set_option_int(.reuse_addr, 1) ?
+	s.set_dualstack(true) or {
+		// Not ipv6, we dont care
+	}
+	$if windows {
+		t := u32(1) // true
+		socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
+	} $else {
+		socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK)) ?
+	}
+	return s
+}
+
+pub fn (mut s TcpSocket) set_option_bool(opt SocketOption, value bool) ? {
+	// TODO reenable when this `in` operation works again
+	// if opt !in opts_can_set {
+	// 	return err_option_not_settable
+	// }
+	// if opt !in opts_bool {
+	// 	return err_option_wrong_type
+	// }
+	x := int(value)
+	socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &x, sizeof(int))) ?
+}
+
+pub fn (mut s TcpSocket) set_dualstack(on bool) ? {
+	x := int(!on)
+	socket_error(C.setsockopt(s.handle, C.IPPROTO_IPV6, int(SocketOption.ipv6_only), &x,
+		sizeof(int))) ?
+}
+
+pub fn (mut s TcpSocket) set_option_int(opt SocketOption, value int) ? {
+	socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &value, sizeof(int))) ?
+}
+
+fn (mut s TcpSocket) close() ? {
+	return shutdown(s.handle)
+}
+
+fn (mut s TcpSocket) @select(test Select, timeout time.Duration) ?bool {
+	return @select(s.handle, test, timeout)
+}
+
+const (
+	connect_timeout = 5 * time.second
+)
+
+fn (mut s TcpSocket) connect(a Addr) ? {
+	res := C.connect(s.handle, voidptr(&a), a.len())
+	if res == 0 {
+		return
+	}
+
+	// The  socket  is  nonblocking and the connection cannot be completed
+	// immediately.  (UNIX domain sockets failed with EAGAIN instead.)
+	// It is possible to select(2) or poll(2) for completion by selecting
+	// the socket for  writing.   After  select(2) indicates  writability,
+	// use getsockopt(2) to read the SO_ERROR option at level SOL_SOCKET to
+	// determine whether connect() completed successfully (SO_ERROR is zero) or
+	// unsuccessfully (SO_ERROR is one of the usual error codes  listed  here,
+	// ex‐ plaining the reason for the failure).
+	write_result := s.@select(.write, net.connect_timeout) ?
+	if write_result {
+		err := 0
+		len := sizeof(err)
+		socket_error(C.getsockopt(s.handle, C.SOL_SOCKET, C.SO_ERROR, &err, &len)) ?
+
+		if err != 0 {
+			return wrap_error(err)
+		}
+		// Succeeded
+		return
+	}
+
+	// Get the error
+	socket_error(C.connect(s.handle, voidptr(&a), a.len())) ?
+
+	// otherwise we timed out
+	return err_connect_timed_out
+}
+
+// address gets the address of a socket
+pub fn (s &TcpSocket) address() ?Addr {
+	return addr_from_socket_handle(s.handle)
+}
-- 
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