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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 = 30 * time.second
udp_default_write_timeout = 30 * time.second
)
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pub struct UdpConn {
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(laddr string, raddr string) ?UdpConn {
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// Dont have to do this when its fixed
// this just allows us to store this `none` optional in a struct
resolve_wrapper := fn (raddr string) ?Addr {
x := resolve_addr(raddr, .inet, .udp) or { return none }
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return x
}
local := resolve_addr(laddr, .inet, .udp) ?
sbase := new_udp_socket(local.port) ?
sock := UdpSocket{
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handle: sbase.handle
l: local
r: resolve_wrapper(raddr)
}
return UdpConn{
sock: sock
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read_timeout: udp_default_read_timeout
write_timeout: udp_default_write_timeout
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}
}
pub fn (c UdpConn) write_ptr(b byteptr, len 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 (c UdpConn) write(buf []byte) ? {
return c.write_ptr(buf.data, buf.len)
}
pub fn (c UdpConn) write_str(s string) ? {
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return c.write_ptr(s.str, s.len)
}
pub fn (c UdpConn) write_to_ptr(addr Addr, b byteptr, len int) ? {
res := C.sendto(c.sock.handle, b, len, 0, &addr.addr, addr.len)
if res >= 0 {
return none
}
code := error_code()
if code == int(error_ewouldblock) {
c.wait_for_write() ?
socket_error(C.sendto(c.sock.handle, b, len, 0, &addr.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 (c UdpConn) write_to(addr Addr, buf []byte) ? {
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 (c UdpConn) write_to_string(addr Addr, s string) ? {
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 (c UdpConn) read(mut buf []byte) ?(int, Addr) {
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mut addr_from := C.sockaddr{}
len := sizeof(C.sockaddr)
mut res := wrap_read_result(C.recvfrom(c.sock.handle, buf.data, buf.len, 0, &addr_from,
&len)) ?
if res > 0 {
addr := new_addr(addr_from) ?
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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, buf.data, buf.len, 0, &addr_from,
&len)) ?
res2 := socket_error(res) ?
addr := new_addr(addr_from) ?
return res2, addr
} else {
wrap_error(code) ?
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}
return none
}
pub fn (c UdpConn) read_deadline() ?time.Time {
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 {
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 {
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 {
return c.write_timeout
}
pub fn (mut c UdpConn) set_write_timeout(t time.Duration) {
c.write_timeout = t
}
[inline]
pub fn (c UdpConn) wait_for_read() ? {
return wait_for_read(c.sock.handle, c.read_deadline, c.read_timeout)
}
[inline]
pub fn (c UdpConn) wait_for_write() ? {
return wait_for_write(c.sock.handle, c.write_deadline, c.write_timeout)
}
pub fn (c UdpConn) str() string {
// TODO
return 'UdpConn'
}
pub fn (c UdpConn) close() ? {
return c.sock.close()
}
pub fn listen_udp(port int) ?UdpConn {
s := new_udp_socket(port) ?
return UdpConn{
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sock: s
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read_timeout: udp_default_read_timeout
write_timeout: udp_default_write_timeout
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}
}
struct UdpSocket {
handle int
l Addr
r ?Addr
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}
fn new_udp_socket(local_port int) ?UdpSocket {
sockfd := socket_error(C.socket(SocketFamily.inet, SocketType.udp, 0)) ?
s := UdpSocket{
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handle: sockfd
}
s.set_option_bool(.reuse_addr, true) ?
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$if windows {
t := true
socket_error(C.ioctlsocket(sockfd, fionbio, &t)) ?
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} $else {
socket_error(C.fcntl(sockfd, C.F_SETFD, C.O_NONBLOCK))
}
// In UDP we always have to bind to a port
validate_port(local_port) ?
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mut addr := C.sockaddr_in{}
addr.sin_family = int(SocketFamily.inet)
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addr.sin_port = C.htons(local_port)
addr.sin_addr.s_addr = C.htonl(C.INADDR_ANY)
size := sizeof(C.sockaddr_in)
// cast to the correct type
sockaddr := unsafe { &C.sockaddr(&addr) }
socket_error(C.bind(s.handle, sockaddr, size)) ?
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return s
}
pub fn (s UdpSocket) remote() ?Addr {
return s.r
}
pub fn (s UdpSocket) 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
// }
socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &value, sizeof(bool))) ?
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return none
}
fn (s UdpSocket) close() ? {
return shutdown(s.handle)
}
fn (s UdpSocket) @select(test Select, timeout time.Duration) ?bool {
return @select(s.handle, test, timeout)
}