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v/vlib/net/udp.v

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module net
import time
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const (
udp_default_read_timeout = time.second / 10
udp_default_write_timeout = time.second / 10
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)
struct UdpSocket {
handle int
l Addr
// TODO(emily): replace with option again
// when i figure out how to coerce it properly
mut:
has_r bool
r Addr
}
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pub struct UdpConn {
pub mut:
sock UdpSocket
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mut:
write_deadline time.Time
read_deadline time.Time
read_timeout time.Duration
write_timeout time.Duration
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}
pub fn dial_udp(raddr string) ?&UdpConn {
addrs := resolve_addrs_fuzzy(raddr, .udp) ?
for addr in addrs {
// create a local socket for this
// bind to any port (or file) (we dont care in this
// case because we only care about the remote)
if sock := new_udp_socket_for_remote(addr) {
return &UdpConn{
sock: sock
read_timeout: net.udp_default_read_timeout
write_timeout: net.udp_default_write_timeout
}
}
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}
return none
}
// pub fn dial_udp(laddr string, raddr string) ?&UdpConn {
// local := resolve_addr(laddr, .inet, .udp) ?
// sbase := new_udp_socket() ?
// sock := UdpSocket{
// handle: sbase.handle
// l: local
// r: resolve_wrapper(raddr)
// }
// }
pub fn (mut c UdpConn) write_ptr(b &byte, len int) ?int {
remote := c.sock.remote() or { return err_no_udp_remote }
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return c.write_to_ptr(remote, b, len)
}
pub fn (mut c UdpConn) write(buf []byte) ?int {
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return c.write_ptr(buf.data, buf.len)
}
pub fn (mut c UdpConn) write_string(s string) ?int {
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return c.write_ptr(s.str, s.len)
}
pub fn (mut c UdpConn) write_to_ptr(addr Addr, b &byte, len int) ?int {
res := C.sendto(c.sock.handle, b, len, 0, voidptr(&addr), addr.len())
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if res >= 0 {
return res
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}
code := error_code()
if code == int(error_ewouldblock) {
c.wait_for_write() ?
socket_error(C.sendto(c.sock.handle, b, len, 0, voidptr(&addr), addr.len())) ?
} else {
wrap_error(code) ?
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}
return none
}
// write_to blocks and writes the buf to the remote addr specified
pub fn (mut c UdpConn) write_to(addr Addr, buf []byte) ?int {
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return c.write_to_ptr(addr, buf.data, buf.len)
}
// write_to_string blocks and writes the buf to the remote addr specified
pub fn (mut c UdpConn) write_to_string(addr Addr, s string) ?int {
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return c.write_to_ptr(addr, s.str, s.len)
}
// read reads from the socket into buf up to buf.len returning the number of bytes read
pub fn (mut c UdpConn) read(mut buf []byte) ?(int, Addr) {
mut addr := Addr{
addr: AddrData{
Ip6: Ip6{}
}
}
len := sizeof(Addr)
mut res := wrap_read_result(C.recvfrom(c.sock.handle, voidptr(buf.data), buf.len,
0, voidptr(&addr), &len)) ?
if res > 0 {
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return res, addr
}
code := error_code()
if code == int(error_ewouldblock) {
c.wait_for_read() ?
// same setup as in tcp
res = wrap_read_result(C.recvfrom(c.sock.handle, voidptr(buf.data), buf.len, 0,
voidptr(&addr), &len)) ?
res2 := socket_error(res) ?
return res2, addr
} else {
wrap_error(code) ?
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}
return none
}
pub fn (c &UdpConn) read_deadline() ?time.Time {
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if c.read_deadline.unix == 0 {
return c.read_deadline
}
return none
}
pub fn (mut c UdpConn) set_read_deadline(deadline time.Time) {
c.read_deadline = deadline
}
pub fn (c &UdpConn) write_deadline() ?time.Time {
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if c.write_deadline.unix == 0 {
return c.write_deadline
}
return none
}
pub fn (mut c UdpConn) set_write_deadline(deadline time.Time) {
c.write_deadline = deadline
}
pub fn (c &UdpConn) read_timeout() time.Duration {
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return c.read_timeout
}
pub fn (mut c UdpConn) set_read_timeout(t time.Duration) {
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c.read_timeout = t
}
pub fn (c &UdpConn) write_timeout() time.Duration {
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return c.write_timeout
}
pub fn (mut c UdpConn) set_write_timeout(t time.Duration) {
c.write_timeout = t
}
[inline]
pub fn (mut c UdpConn) wait_for_read() ? {
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return wait_for_read(c.sock.handle, c.read_deadline, c.read_timeout)
}
[inline]
pub fn (mut c UdpConn) wait_for_write() ? {
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return wait_for_write(c.sock.handle, c.write_deadline, c.write_timeout)
}
pub fn (c &UdpConn) str() string {
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// TODO
return 'UdpConn'
}
pub fn (mut c UdpConn) close() ? {
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return c.sock.close()
}
pub fn listen_udp(laddr string) ?&UdpConn {
addrs := resolve_addrs_fuzzy(laddr, .udp) ?
// TODO(emily):
// here we are binding to the first address
// and that is probably not ideal
addr := addrs[0]
return &UdpConn{
sock: new_udp_socket(addr) ?
read_timeout: net.udp_default_read_timeout
write_timeout: net.udp_default_write_timeout
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}
}
fn new_udp_socket(local_addr Addr) ?&UdpSocket {
family := local_addr.family()
sockfd := socket_error(C.socket(family, SocketType.udp, 0)) ?
mut s := &UdpSocket{
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handle: sockfd
l: local_addr
r: Addr{
addr: AddrData{
Ip6: Ip6{}
}
}
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}
s.set_option_bool(.reuse_addr, true) ?
if family == .ip6 {
s.set_dualstack(true) ?
}
// NOTE: refer to comments in tcp.v
$if windows {
t := u32(1) // true
socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
} $else {
socket_error(C.fcntl(sockfd, C.F_SETFD, C.O_NONBLOCK)) ?
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}
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// cast to the correct type
socket_error(C.bind(s.handle, voidptr(&local_addr), local_addr.len())) ?
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return s
}
fn new_udp_socket_for_remote(raddr Addr) ?&UdpSocket {
// Invent a sutible local address for this remote addr
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// Appease compiler
mut addr := Addr{
addr: AddrData{
Ip6: Ip6{}
}
}
match raddr.family() {
.ip, .ip6 {
// Use ip6 dualstack
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addr = new_ip6(0, addr_ip6_any)
}
.unix {
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addr = temp_unix() ?
}
else {
panic('Invalid family')
}
}
mut sock := new_udp_socket(addr) ?
sock.has_r = true
sock.r = raddr
return sock
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}
pub fn (mut s UdpSocket) set_option_bool(opt SocketOption, value bool) ? {
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// 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 UdpSocket) set_dualstack(on bool) ? {
x := int(!on)
socket_error(C.setsockopt(s.handle, C.IPPROTO_IPV6, int(SocketOption.ipv6_only), &x,
sizeof(int))) ?
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}
fn (mut s UdpSocket) close() ? {
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return shutdown(s.handle)
}
fn (mut s UdpSocket) @select(test Select, timeout time.Duration) ?bool {
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return @select(s.handle, test, timeout)
}
fn (s &UdpSocket) remote() ?Addr {
if s.has_r {
return s.r
}
return none
}