net: socket error handling
parent
2291e9fcfe
commit
d72c859bf9
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@ -24,7 +24,6 @@ import const (
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SD_BOTH
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)
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// used for WinSock init
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struct C.WSAData {
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mut:
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wVersion u16
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@ -36,6 +35,14 @@ mut:
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lpVendorInfo byteptr
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}
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const (
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WSA_V1 = 0x100 // C.MAKEWORD(1, 0)
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WSA_V11 = 0x101 // C.MAKEWORD(1, 1)
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WSA_V2 = 0x200 // C.MAKEWORD(2, 0)
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WSA_V21 = 0x201 // C.MAKEWORD(2, 1)
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WSA_V22 = 0x202 // C.MAKEWORD(2, 2)
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)
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struct C.in_addr {
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mut:
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s_addr int
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@ -62,14 +69,19 @@ mut:
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struct C.sockaddr_storage {}
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// create socket
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pub fn socket(family int, _type int, proto int) Socket {
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pub fn socket(family int, _type int, proto int) ?Socket {
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$if windows {
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mut wsadata := C.WSAData{}
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res := C.WSAStartup(0x202, &wsadata)
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// TODO: throw error if WSAStartup fails
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res := C.WSAStartup(WSA_V22, &wsadata)
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if res != 0 {
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return error('socket: WSAStartup failed')
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}
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}
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sockfd := C.socket(family, _type, proto)
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if sockfd == 0 {
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return error('socket: init failed')
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}
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s := Socket {
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sockfd: sockfd
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family: family
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@ -80,66 +92,72 @@ pub fn socket(family int, _type int, proto int) Socket {
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}
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// set socket options
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pub fn (s Socket) setsockopt(level int, optname int, optvalue *int) int {
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pub fn (s Socket) setsockopt(level int, optname int, optvalue *int) ?int {
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res := C.setsockopt(s.sockfd, level, optname, optvalue, C.sizeof(optvalue))
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return res
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if res < 0 {
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return error('socket: setsockopt failed')
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}
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return int(res)
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}
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// bind socket to port
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pub fn (s Socket) bind(port int) int {
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pub fn (s Socket) bind(port int) ?int {
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mut addr := C.sockaddr_in{}
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addr.sin_family = s.family
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addr.sin_port = C.htons(port)
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addr.sin_addr.s_addr = C.htonl(INADDR_ANY)
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size := 16 // sizeof(C.sockaddr_in)
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res := C.bind(s.sockfd, &addr, size)
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return res
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if res < 0 {
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return error('socket: bind failed')
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}
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return int(res)
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}
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// put socket into passive mode and wait to receive
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pub fn (s Socket) listen() int {
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pub fn (s Socket) listen() ?int {
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backlog := 128
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res := C.listen(s.sockfd, backlog)
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return res
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if res < 0 {
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return error('socket: listen failed')
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}
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return int(res)
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}
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// put socket into passive mode with user specified backlog and wait to receive
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pub fn (s Socket) listen_backlog(backlog int) int {
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pub fn (s Socket) listen_backlog(backlog int) ?int {
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mut n := 0
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if backlog > 0 {
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n = backlog
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}
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res := C.listen(s.sockfd, n)
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return res
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if res < 0 {
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return error('socket: listen_backlog failed')
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}
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return int(res)
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}
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// helper method to create, bind, and listen given port number
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pub fn listen(port int) Socket {
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s := socket(AF_INET, SOCK_STREAM, 0)
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if s.sockfd == 0 {
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println('socket: init socket failed')
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return s
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pub fn listen(port int) ?Socket {
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s := socket(AF_INET, SOCK_STREAM, 0) or {
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return error(err)
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}
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bind_res := s.bind(port)
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if bind_res < 0 {
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println('socket: bind failed')
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return s
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bind_res := s.bind(port) or {
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return error(err)
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}
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listen_res := s.listen()
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if listen_res < 0 {
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println('socket: listen failed')
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return s
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listen_res := s.listen() or {
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return error(err)
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}
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return s
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}
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// accept first connection request from socket queue
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pub fn (s Socket) accept() Socket {
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pub fn (s Socket) accept() ?Socket {
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addr := C.sockaddr_storage{}
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size := 128 // sizeof(sockaddr_storage)
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sockfd := C.accept(s.sockfd, &addr, &size)
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if sockfd < 0 {
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println('socket: accept failed')
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return error('socket: accept failed')
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}
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c := Socket {
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sockfd: sockfd
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@ -151,7 +169,7 @@ pub fn (s Socket) accept() Socket {
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}
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// connect to given addrress and port
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pub fn (s Socket) connect(address string, port int) int {
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pub fn (s Socket) connect(address string, port int) ?int {
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mut hints := C.addrinfo{}
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hints.ai_family = AF_UNSPEC
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hints.ai_socktype = SOCK_STREAM
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@ -161,20 +179,22 @@ pub fn (s Socket) connect(address string, port int) int {
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sport := '$port'
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info_res := C.getaddrinfo(address.str, sport.str, &hints, &info)
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if info_res != 0 {
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println('socket: getaddrinfo failed')
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return info_res
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return error('socket: connect failed')
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}
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res := C.connect(s.sockfd, info.ai_addr, info.ai_addrlen)
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return res
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if res < 0 {
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return error('socket: connect failed')
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}
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return int(res)
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}
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// helper method to create socket and connect
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pub fn dial(address string, port int) Socket {
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s := socket(AF_INET, SOCK_STREAM, 0)
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res := s.connect(address, port)
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if res < 0 {
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println('socket: failed to connect')
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pub fn dial(address string, port int) ?Socket {
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s := socket(AF_INET, SOCK_STREAM, 0) or {
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return error(err)
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}
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res := s.connect(address, port) or {
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return error(err)
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}
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return s
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}
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@ -182,9 +202,9 @@ pub fn dial(address string, port int) Socket {
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// send string data to socket
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pub fn (s Socket) send(buf byteptr, len int) int {
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res := C.send(s.sockfd, buf, len, 0)
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if res < 0 {
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println('socket: send failed')
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}
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// if res < 0 {
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// return error('socket: send failed')
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// }
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return res
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}
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@ -192,43 +212,41 @@ pub fn (s Socket) send(buf byteptr, len int) int {
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pub fn (s Socket) recv(bufsize int) byteptr {
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buf := malloc(bufsize)
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res := C.recv(s.sockfd, buf, bufsize, 0)
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if res < 0 {
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println('socket: recv failed')
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}
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// if res < 0 {
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// return error('socket: recv failed')
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// }
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return buf
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}
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// shutdown and close socket
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pub fn (s Socket) close() int {
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pub fn (s Socket) close() ?int {
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// WinSock
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$if windows {
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C.WSACleanup()
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}
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mut shutdown_res := 0
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$if windows {
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shutdown_res := C.shutdown(s.sockfd, SD_BOTH)
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if shutdown_res < 0 {
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println('socket: shutdown failed')
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}
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shutdown_res = C.shutdown(s.sockfd, SD_BOTH)
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}
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$else {
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shutdown_res := C.shutdown(s.sockfd, SHUT_RDWR)
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if shutdown_res < 0 {
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println('socket: shutdown failed')
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}
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shutdown_res = C.shutdown(s.sockfd, SHUT_RDWR)
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}
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// TODO: should shutdown throw an error? close will
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// continue even if shutdown failed
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// if shutdown_res < 0 {
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// return error('socket: shutdown failed')
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// }
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mut res := 0
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$if windows {
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res := C.closesocket(s.sockfd)
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if res < 0 {
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println('socket: close failed')
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}
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res = C.closesocket(s.sockfd)
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}
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$else {
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res := C.close(s.sockfd)
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if res < 0 {
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println('socket: close failed')
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res = C.close(s.sockfd)
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}
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if res < 0 {
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return error('socket: close failed')
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}
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return 0
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@ -1,20 +1,29 @@
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import net
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fn test_socket() {
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// server := net.listen(8080)
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// server := net.listen(8080) or {
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// println(err)
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// return
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// }
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// println(server)
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// client := net.dial('127.0.0.1', 8080)
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// client := net.dial('127.0.0.1', 8080) or {
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// println(err)
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// return
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// }
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// println(client)
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// socket := server.accept()
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// socket := server.accept() or {
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// println(err)
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// return
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// }
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// println(socket)
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//
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// message := 'Hello World'
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// socket.send(message.str, message.len)
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// println('Sent: ' + message)
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//
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// bytes := client.recv(1024)
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// println('Received: ' + tos(bytes, message.len))
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//
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// server.close()
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// client.close()
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// socket.close()
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@ -3,23 +3,3 @@ module net
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#flag -lws2_32
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#include <winsock2.h>
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#include <Ws2tcpip.h>
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-wsastartup
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const (
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WSA_V1 = 0x100 // C.MAKEWORD(1, 0)
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WSA_V11 = 0x101 // C.MAKEWORD(1, 1)
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WSA_V2 = 0x200 // C.MAKEWORD(2, 0)
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WSA_V21 = 0x201 // C.MAKEWORD(2, 1)
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WSA_V22 = 0x202 // C.MAKEWORD(2, 2)
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)
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pub fn socket(family int, stype int, prototype int) Socket {
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sockfd := C.socket(family, _type, proto)
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s := Socket {
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sockfd: sockfd
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family: family
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_type: _type
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proto: proto
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}
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return s
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}
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