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 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 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 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))? } $else { socket_error(C.fcntl(sockfd, C.F_SETFL, C.fcntl(sockfd, C.F_GETFL) | C.O_NONBLOCK))? } } return s } pub fn (mut s TcpSocket) set_option_bool(opt SocketOption, value bool) ? { // TODO reenable when this `in` operation works again // if opt !in opts_can_set { // return err_option_not_settable // } // if opt !in opts_bool { // return err_option_wrong_type // } x := int(value) socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &x, sizeof(int)))? } pub fn (mut s TcpSocket) set_dualstack(on bool) ? { x := int(!on) socket_error(C.setsockopt(s.handle, C.IPPROTO_IPV6, int(SocketOption.ipv6_only), &x, sizeof(int)))? } pub fn (mut s TcpSocket) set_option_int(opt SocketOption, value int) ? { socket_error(C.setsockopt(s.handle, C.SOL_SOCKET, int(opt), &value, sizeof(int)))? } // bind a local rddress for TcpSocket pub fn (mut s TcpSocket) bind(addr string) ? { addrs := resolve_addrs(addr, AddrFamily.ip, .tcp) or { return error('$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)? } }