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v/vlib/net/tcp.v

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module net
import time
import io
import strings
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
is_blocking bool
}
pub fn dial_tcp(address string) !&TcpConn {
addrs := resolve_addrs_fuzzy(address, .tcp) or {
return error('$err.msg(); could not resolve address $address in dial_tcp')
}
// Keep track of dialing errors that take place
mut errs := []IError{}
// Very simple dialer
for addr in addrs {
mut s := new_tcp_socket(addr.family()) or {
return error('$err.msg(); could not create new tcp socket in dial_tcp')
}
s.connect(addr) or {
errs << err
// 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
}
}
// Once we've failed now try and explain why we failed to connect
// to any of these addresses
mut err_builder := strings.new_builder(1024)
err_builder.write_string('dial_tcp failed for address $address\n')
err_builder.write_string('tried addrs:\n')
for i := 0; i < errs.len; i++ {
addr := addrs[i]
why := errs[i]
err_builder.write_string('\t$addr: $why\n')
}
// failed
return error(err_builder.str())
}
// bind local address and dial.
pub fn dial_tcp_with_bind(saddr string, laddr string) !&TcpConn {
addrs := resolve_addrs_fuzzy(saddr, .tcp) or {
return error('$err.msg(); could not resolve address $saddr in dial_tcp_with_bind')
}
// Very simple dialer
for addr in addrs {
mut s := new_tcp_socket(addr.family()) or {
return error('$err.msg(); could not create new tcp socket in dial_tcp_with_bind')
}
s.bind(laddr) or {
s.close() or { continue }
continue
}
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_with_bind failed for address $saddr')
}
pub fn (mut c TcpConn) close() ! {
$if trace_tcp ? {
eprintln(' TcpConn.close | c.sock.handle: ${c.sock.handle:6}')
}
c.sock.close()!
}
pub fn (c TcpConn) read_ptr(buf_ptr &u8, 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 {
$if trace_tcp_data_read ? {
eprintln('<<< TcpConn.read_ptr | 1 data.len: ${res:6} | data: ' +
unsafe { buf_ptr.vstring_with_len(res) })
}
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')
}
$if trace_tcp_data_read ? {
if res > 0 {
eprintln('<<< TcpConn.read_ptr | 2 data.len: ${res:6} | data: ' +
unsafe { buf_ptr.vstring_with_len(res) })
}
}
return socket_error(res)
} else {
wrap_error(code)!
}
return error('none')
}
pub fn (c TcpConn) read(mut buf []u8) !int {
return c.read_ptr(buf.data, buf.len) or {
return IError(io.NotExpected{
cause: 'unexpected error in `read_ptr` function'
code: -1
})
}
}
pub fn (mut c TcpConn) read_deadline() !time.Time {
if c.read_deadline.unix == 0 {
return c.read_deadline
}
return error('none')
}
// write_ptr blocks and attempts to write all data
pub fn (mut c TcpConn) write_ptr(b &u8, 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) })
}
$if trace_tcp_data_write ? {
eprintln('>>> TcpConn.write_ptr | data.len: ${len:6} | data: ' +
unsafe { b.vstring_with_len(len) })
}
unsafe {
mut ptr_base := &u8(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 trace_tcp_data_write ? {
eprintln('>>> TcpConn.write_ptr | data chunk, total_sent: ${total_sent:6}, chunk_size: ${chunk_size:6}, sent: ${sent:6}, ptr: ${ptr_str(ptr)}')
}
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 []u8) !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) 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 error('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 (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_message(C.getpeername(c.sock.handle, voidptr(&addr), &size), 'peer_addr failed')!
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: $s }'
}
pub struct TcpListener {
pub mut:
sock TcpSocket
mut:
accept_timeout time.Duration
accept_deadline time.Time
}
pub fn listen_tcp(family AddrFamily, saddr string) !&TcpListener {
s := new_tcp_socket(family) or { return error('$err.msg(); could not create new socket') }
addrs := resolve_addrs(saddr, family, .tcp) or {
return error('$err.msg(); could not resolve address $saddr')
}
// TODO(logic to pick here)
addr := addrs[0]
// cast to the correct type
alen := addr.len()
socket_error_message(C.bind(s.handle, voidptr(&addr), alen), 'binding to $saddr failed')!
socket_error_message(C.listen(s.handle, 128), 'listening on $saddr failed')!
return &TcpListener{
sock: s
accept_deadline: no_deadline
accept_timeout: infinite_timeout
}
}
pub fn (mut l TcpListener) accept() !&TcpConn {
$if trace_tcp ? {
eprintln(' TcpListener.accept | l.sock.handle: ${l.sock.handle:6}')
}
mut new_handle := C.accept(l.sock.handle, 0, 0)
if new_handle <= 0 {
l.wait_for_accept()!
new_handle = C.accept(l.sock.handle, 0, 0)
if new_handle == -1 || new_handle == 0 {
return error('accept failed')
}
}
new_sock := tcp_socket_from_handle(new_handle)!
$if trace_tcp ? {
eprintln(' TcpListener.accept | << new_sock.handle: ${new_sock.handle:6}')
}
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 {
Socket
}
fn new_tcp_socket(family AddrFamily) !TcpSocket {
handle := socket_error(C.socket(family, SocketType.tcp, 0))!
mut s := TcpSocket{
handle: handle
}
$if trace_tcp ? {
eprintln(' new_tcp_socket | s.handle: ${s.handle:6}')
}
// 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 !net_blocking_sockets ? {
$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
}
$if trace_tcp ? {
eprintln(' tcp_socket_from_handle | s.handle: ${s.handle:6}')
}
// 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 !net_blocking_sockets ? {
$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
}
// tcp_socket_from_handle_raw is similar to tcp_socket_from_handle, but it does not modify any socket options
pub fn tcp_socket_from_handle_raw(sockfd int) TcpSocket {
mut s := TcpSocket{
handle: sockfd
}
$if trace_tcp ? {
eprintln(' tcp_socket_from_handle_raw | s.handle: ${s.handle:6}')
}
return s
}
pub fn (mut s TcpSocket) set_option_bool(opt SocketOption, value bool) ! {
// TODO reenable when this `in` operation works again
// if opt !in opts_can_set {
// return err_option_not_settable
// }
// if opt !in opts_bool {
// return err_option_wrong_type
// }
x := int(value)
socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &x, sizeof(int)))!
}
pub fn (mut s TcpSocket) set_dualstack(on bool) ! {
x := int(!on)
socket_error(C.setsockopt(s.handle, C.IPPROTO_IPV6, int(SocketOption.ipv6_only), &x,
sizeof(int)))!
}
pub fn (mut s TcpSocket) set_option_int(opt SocketOption, value int) ! {
socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &value, sizeof(int)))!
}
// bind a local rddress for TcpSocket
pub fn (mut s TcpSocket) bind(addr string) ! {
addrs := resolve_addrs(addr, AddrFamily.ip, .tcp) or {
return error('$err.msg(); could not resolve address $addr')
}
// TODO(logic to pick here)
a := addrs[0]
// cast to the correct type
alen := a.len()
socket_error_message(C.bind(s.handle, voidptr(&a), alen), 'binding to $addr failed') or {
return err
}
}
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) ! {
$if !net_blocking_sockets ? {
res := C.connect(s.handle, voidptr(&a), a.len())
if res == 0 {
return
}
ecode := error_code()
// On nix non-blocking sockets we expect einprogress
// On windows we expect res == -1 && error_code() == ewouldblock
if (is_windows && ecode == int(error_ewouldblock))
|| (!is_windows && res == -1 && ecode == int(error_einprogress)) {
// 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)!
err := 0
len := sizeof(err)
xyz := C.getsockopt(s.handle, C.SOL_SOCKET, C.SO_ERROR, &err, &len)
if xyz == 0 && err == 0 {
return
}
if write_result {
if xyz == 0 {
wrap_error(err)!
return
}
return
}
return err_timed_out
}
wrap_error(ecode)!
return
} $else {
x := C.connect(s.handle, voidptr(&a), a.len())
socket_error(x)!
}
}