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/*
* Copyright (c) 2020 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "util.h"
#endif
#ifdef JANET_NET
#include <math.h>
#ifdef JANET_WINDOWS
#include <winsock2.h>
#include <windows.h>
#include <ws2tcpip.h>
#include <mswsock.h>
#pragma comment (lib, "Ws2_32.lib")
#pragma comment (lib, "Mswsock.lib")
#pragma comment (lib, "Advapi32.lib")
#else
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <fcntl.h>
#endif
const JanetAbstractType janet_address_type = {
"core/socket-address",
JANET_ATEND_NAME
};
#ifdef JANET_WINDOWS
#define JSOCKCLOSE(x) closesocket((SOCKET) x)
#define JSOCKDEFAULT INVALID_SOCKET
#define JSOCKVALID(x) ((x) != INVALID_SOCKET)
#define JSock SOCKET
#define JSOCKFLAGS 0
#else
#define JSOCKCLOSE(x) close(x)
#define JSOCKDEFAULT 0
#define JSOCKVALID(x) ((x) >= 0)
#define JSock int
#ifdef SOCK_CLOEXEC
#define JSOCKFLAGS SOCK_CLOEXEC
#else
#define JSOCKFLAGS 0
#endif
#endif
static JanetStream *make_stream(JSock handle, uint32_t flags);
/* We pass this flag to all send calls to prevent sigpipe */
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
static void nosigpipe(JSock s) {
#ifdef SO_NOSIGPIPE
int enable = 1;
if (setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &enable, sizeof(int)) < 0) {
JSOCKCLOSE(s);
janet_panic("setsockopt(SO_NOSIGPIPE) failed");
}
#else
(void) s;
#endif
}
/* State machine for accepting connections. */
#ifdef JANET_WINDOWS
typedef struct {
JanetListenerState head;
WSAOVERLAPPED overlapped;
JanetFunction *function;
JanetStream *lstream;
JanetStream *astream;
char buf[1024];
} NetStateAccept;
static int net_sched_accept_impl(NetStateAccept *state, Janet *err);
JanetAsyncStatus net_machine_accept(JanetListenerState *s, JanetAsyncEvent event) {
NetStateAccept *state = (NetStateAccept *)s;
switch (event) {
default:
break;
case JANET_ASYNC_EVENT_MARK: {
if (state->lstream) janet_mark(janet_wrap_abstract(state->lstream));
if (state->astream) janet_mark(janet_wrap_abstract(state->astream));
if (state->function) janet_mark(janet_wrap_abstract(state->function));
break;
}
case JANET_ASYNC_EVENT_CLOSE:
janet_schedule(s->fiber, janet_wrap_nil());
return JANET_ASYNC_STATUS_DONE;
case JANET_ASYNC_EVENT_COMPLETE: {
int seconds;
int bytes = sizeof(seconds);
if (NO_ERROR != getsockopt((SOCKET) state->astream->handle, SOL_SOCKET, SO_CONNECT_TIME,
(char *)&seconds, &bytes)) {
janet_cancel(s->fiber, janet_cstringv("failed to accept connection"));
return JANET_ASYNC_STATUS_DONE;
}
if (NO_ERROR != setsockopt((SOCKET) state->astream->handle, SOL_SOCKET, SO_UPDATE_ACCEPT_CONTEXT,
(char *) & (state->lstream->handle), sizeof(SOCKET))) {
janet_cancel(s->fiber, janet_cstringv("failed to accept connection"));
return JANET_ASYNC_STATUS_DONE;
}
Janet streamv = janet_wrap_abstract(state->astream);
if (state->function) {
/* Schedule worker */
JanetFiber *fiber = janet_fiber(state->function, 64, 1, &streamv);
janet_schedule(fiber, janet_wrap_nil());
/* Now listen again for next connection */
Janet err;
if (net_sched_accept_impl(state, &err)) {
janet_cancel(s->fiber, err);
return JANET_ASYNC_STATUS_DONE;
}
} else {
janet_schedule(s->fiber, streamv);
return JANET_ASYNC_STATUS_DONE;
}
}
}
return JANET_ASYNC_STATUS_NOT_DONE;
}
JANET_NO_RETURN static void janet_sched_accept(JanetStream *stream, JanetFunction *fun) {
Janet err;
SOCKET lsock = (SOCKET) stream->handle;
JanetListenerState *s = janet_listen(stream, net_machine_accept, JANET_ASYNC_LISTEN_READ, sizeof(NetStateAccept), NULL);
NetStateAccept *state = (NetStateAccept *)s;
memset(&state->overlapped, 0, sizeof(WSAOVERLAPPED));
memset(&state->buf, 0, 1024);
state->function = fun;
state->lstream = stream;
s->tag = &state->overlapped;
if (net_sched_accept_impl(state, &err)) janet_panicv(err);
janet_await();
}
static int net_sched_accept_impl(NetStateAccept *state, Janet *err) {
SOCKET lsock = (SOCKET) state->lstream->handle;
SOCKET asock = WSASocketW(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);
if (asock == INVALID_SOCKET) {
*err = janet_ev_lasterr();
return 1;
}
JanetStream *astream = make_stream(asock, JANET_STREAM_READABLE | JANET_STREAM_WRITABLE);
state->astream = astream;
int socksize = sizeof(SOCKADDR_STORAGE) + 16;
if (FALSE == AcceptEx(lsock, asock, state->buf, 0, socksize, socksize, NULL, &state->overlapped)) {
int code = WSAGetLastError();
if (code == WSA_IO_PENDING) return 0; /* indicates io is happening async */
*err = janet_ev_lasterr();
return 1;
}
return 0;
}
#else
typedef struct {
JanetListenerState head;
JanetFunction *function;
} NetStateAccept;
JanetAsyncStatus net_machine_accept(JanetListenerState *s, JanetAsyncEvent event) {
NetStateAccept *state = (NetStateAccept *)s;
switch (event) {
default:
break;
case JANET_ASYNC_EVENT_MARK: {
if (state->function) janet_mark(janet_wrap_function(state->function));
break;
}
case JANET_ASYNC_EVENT_CLOSE:
janet_schedule(s->fiber, janet_wrap_nil());
return JANET_ASYNC_STATUS_DONE;
case JANET_ASYNC_EVENT_READ: {
JSock connfd = accept(s->stream->handle, NULL, NULL);
if (JSOCKVALID(connfd)) {
nosigpipe(connfd);
JanetStream *stream = make_stream(connfd, JANET_STREAM_READABLE | JANET_STREAM_WRITABLE);
Janet streamv = janet_wrap_abstract(stream);
if (state->function) {
JanetFiber *fiber = janet_fiber(state->function, 64, 1, &streamv);
janet_schedule(fiber, janet_wrap_nil());
} else {
janet_schedule(s->fiber, streamv);
return JANET_ASYNC_STATUS_DONE;
}
}
break;
}
}
return JANET_ASYNC_STATUS_NOT_DONE;
}
JANET_NO_RETURN static void janet_sched_accept(JanetStream *stream, JanetFunction *fun) {
NetStateAccept *state = (NetStateAccept *) janet_listen(stream, net_machine_accept, JANET_ASYNC_LISTEN_READ, sizeof(NetStateAccept), NULL);
state->function = fun;
janet_await();
}
#endif
/* Adress info */
static int janet_get_sockettype(Janet *argv, int32_t argc, int32_t n) {
JanetKeyword stype = janet_optkeyword(argv, argc, n, NULL);
int socktype = SOCK_DGRAM;
if ((NULL == stype) || !janet_cstrcmp(stype, "stream")) {
socktype = SOCK_STREAM;
} else if (janet_cstrcmp(stype, "datagram")) {
janet_panicf("expected socket type as :stream or :datagram, got %v", argv[n]);
}
return socktype;
}
/* Needs argc >= offset + 2 */
/* For unix paths, just rertuns a single sockaddr and sets *is_unix to 1, otherwise 0 */
static struct addrinfo *janet_get_addrinfo(Janet *argv, int32_t offset, int socktype, int passive, int *is_unix) {
/* Unix socket support - not yet supported on windows. */
#ifndef JANET_WINDOWS
if (janet_keyeq(argv[offset], "unix")) {
const char *path = janet_getcstring(argv, offset + 1);
struct sockaddr_un *saddr = malloc(sizeof(struct sockaddr_un));
if (saddr == NULL) {
JANET_OUT_OF_MEMORY;
}
saddr->sun_family = AF_UNIX;
memset(&saddr->sun_path, 0, 108);
#ifdef JANET_LINUX
if (path[0] == '@') {
saddr->sun_path[0] = '\0';
snprintf(saddr->sun_path + 1, 107, "%s", path + 1);
} else
#endif
{
snprintf(saddr->sun_path, 108, "%s", path);
}
*is_unix = 1;
return (struct addrinfo *) saddr;
}
#endif
/* Get host and port */
const char *host = janet_getcstring(argv, offset);
const char *port;
if (janet_checkint(argv[offset + 1])) {
port = (const char *)janet_to_string(argv[offset + 1]);
} else {
port = janet_optcstring(argv, offset + 2, offset + 1, NULL);
}
/* getaddrinfo */
struct addrinfo *ai = NULL;
struct addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = socktype;
hints.ai_flags = passive ? AI_PASSIVE : 0;
int status = getaddrinfo(host, port, &hints, &ai);
if (status) {
janet_panicf("could not get address info: %s", gai_strerror(status));
}
*is_unix = 0;
return ai;
}
/*
* C Funs
*/
static Janet cfun_net_sockaddr(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 4);
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
int make_arr = (argc >= 3 && janet_truthy(argv[3]));
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix);
#ifndef JANET_WINDOWS
/* no unix domain socket support on windows yet */
if (is_unix) {
void *abst = janet_abstract(&janet_address_type, sizeof(struct sockaddr_un));
memcpy(abst, ai, sizeof(struct sockaddr_un));
Janet ret = janet_wrap_abstract(abst);
return make_arr ? janet_wrap_array(janet_array_n(&ret, 1)) : ret;
}
#endif
if (make_arr) {
/* Select all */
JanetArray *arr = janet_array(10);
struct addrinfo *iter = ai;
while (NULL != iter) {
void *abst = janet_abstract(&janet_address_type, iter->ai_addrlen);
memcpy(abst, iter->ai_addr, iter->ai_addrlen);
janet_array_push(arr, janet_wrap_abstract(abst));
iter = iter->ai_next;
}
freeaddrinfo(ai);
return janet_wrap_array(arr);
} else {
/* Select first */
if (NULL == ai) {
janet_panic("no data for given address");
}
void *abst = janet_abstract(&janet_address_type, ai->ai_addrlen);
memcpy(abst, ai->ai_addr, ai->ai_addrlen);
freeaddrinfo(ai);
return janet_wrap_abstract(abst);
}
}
static Janet cfun_net_connect(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 3);
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 0, &is_unix);
/* Create socket */
JSock sock = JSOCKDEFAULT;
void *addr = NULL;
socklen_t addrlen;
#ifndef JANET_WINDOWS
if (is_unix) {
sock = socket(AF_UNIX, socktype | JSOCKFLAGS, 0);
if (!JSOCKVALID(sock)) {
janet_panic("could not create socket");
}
addr = (void *) ai;
addrlen = sizeof(struct sockaddr_un);
} else
#endif
{
struct addrinfo *rp = NULL;
for (rp = ai; rp != NULL; rp = rp->ai_next) {
#ifdef JANET_WINDOWS
sock = WSASocketW(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol, NULL, 0, WSA_FLAG_OVERLAPPED);
#else
sock = socket(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol);
#endif
if (JSOCKVALID(sock)) {
addr = rp->ai_addr;
addrlen = (socklen_t) rp->ai_addrlen;
break;
}
}
if (NULL == addr) {
freeaddrinfo(ai);
janet_panic("could not create socket");
}
}
/* Connect to socket */
int status = connect(sock, addr, addrlen);
if (is_unix) {
free(ai);
} else {
freeaddrinfo(ai);
}
if (status == -1) {
JSOCKCLOSE(sock);
janet_panic("could not connect to socket");
}
nosigpipe(sock);
/* Wrap socket in abstract type JanetStream */
JanetStream *stream = make_stream(sock, JANET_STREAM_READABLE | JANET_STREAM_WRITABLE);
return janet_wrap_abstract(stream);
}
static const char *serverify_socket(JSock sfd) {
/* Set various socket options */
int enable = 1;
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char *) &enable, sizeof(int)) < 0) {
return "setsockopt(SO_REUSEADDR) failed";
}
#ifdef SO_REUSEPORT
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEPORT, &enable, sizeof(int)) < 0) {
return "setsockopt(SO_REUSEPORT) failed";
}
#endif
return NULL;
}
static Janet cfun_net_listen(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 3);
/* Get host, port, and handler*/
int socktype = janet_get_sockettype(argv, argc, 2);
int is_unix = 0;
struct addrinfo *ai = janet_get_addrinfo(argv, 0, socktype, 1, &is_unix);
JSock sfd = JSOCKDEFAULT;
#ifndef JANET_WINDOWS
if (is_unix) {
sfd = socket(AF_UNIX, socktype | JSOCKFLAGS, 0);
if (!JSOCKVALID(sfd)) {
free(ai);
janet_panic("could not create socket");
}
const char *err = serverify_socket(sfd);
if (NULL != err || bind(sfd, (struct sockaddr *)ai, sizeof(struct sockaddr_un))) {
JSOCKCLOSE(sfd);
free(ai);
janet_panic(err ? err : "could not bind socket");
}
free(ai);
} else
#endif
{
/* Check all addrinfos in a loop for the first that we can bind to. */
struct addrinfo *rp = NULL;
for (rp = ai; rp != NULL; rp = rp->ai_next) {
#ifdef JANET_WINDOWS
sfd = WSASocketW(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol, NULL, 0, WSA_FLAG_OVERLAPPED);
#else
sfd = socket(rp->ai_family, rp->ai_socktype | JSOCKFLAGS, rp->ai_protocol);
#endif
if (!JSOCKVALID(sfd)) continue;
const char *err = serverify_socket(sfd);
if (NULL != err) {
JSOCKCLOSE(sfd);
continue;
}
/* Bind */
if (bind(sfd, rp->ai_addr, (int) rp->ai_addrlen) == 0) break;
JSOCKCLOSE(sfd);
}
freeaddrinfo(ai);
if (NULL == rp) {
janet_panic("could not bind to any sockets");
}
}
nosigpipe(sfd);
if (socktype == SOCK_DGRAM) {
/* Datagram server (UDP) */
JanetStream *stream = make_stream(sfd, JANET_STREAM_UDPSERVER | JANET_STREAM_READABLE);
return janet_wrap_abstract(stream);
} else {
/* Stream server (TCP) */
/* listen */
int status = listen(sfd, 1024);
if (status) {
JSOCKCLOSE(sfd);
janet_panic("could not listen on file descriptor");
}
/* Put sfd on our loop */
JanetStream *stream = make_stream(sfd, JANET_STREAM_ACCEPTABLE);
return janet_wrap_abstract(stream);
}
}
static Janet cfun_stream_accept_loop(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_ACCEPTABLE | JANET_STREAM_SOCKET);
JanetFunction *fun = janet_getfunction(argv, 1);
janet_sched_accept(stream, fun);
}
static Janet cfun_stream_accept(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 2);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_ACCEPTABLE | JANET_STREAM_SOCKET);
double to = janet_optnumber(argv, argc, 1, INFINITY);
if (to != INFINITY) janet_addtimeout(to);
janet_sched_accept(stream, NULL);
}
static Janet cfun_stream_read(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 4);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_READABLE | JANET_STREAM_SOCKET);
JanetBuffer *buffer = janet_optbuffer(argv, argc, 2, 10);
double to = janet_optnumber(argv, argc, 3, INFINITY);
if (janet_keyeq(argv[1], "all")) {
if (to != INFINITY) janet_addtimeout(to);
janet_ev_recvchunk(stream, buffer, -1, MSG_NOSIGNAL);
} else {
int32_t n = janet_getnat(argv, 1);
if (to != INFINITY) janet_addtimeout(to);
janet_ev_recv(stream, buffer, n, MSG_NOSIGNAL);
}
janet_await();
}
static Janet cfun_stream_chunk(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 4);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_READABLE | JANET_STREAM_SOCKET);
int32_t n = janet_getnat(argv, 1);
JanetBuffer *buffer = janet_optbuffer(argv, argc, 2, 10);
double to = janet_optnumber(argv, argc, 3, INFINITY);
if (to != INFINITY) janet_addtimeout(to);
janet_ev_recvchunk(stream, buffer, n, MSG_NOSIGNAL);
janet_await();
}
static Janet cfun_stream_recv_from(int32_t argc, Janet *argv) {
janet_arity(argc, 3, 4);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_UDPSERVER | JANET_STREAM_SOCKET);
int32_t n = janet_getnat(argv, 1);
JanetBuffer *buffer = janet_getbuffer(argv, 2);
double to = janet_optnumber(argv, argc, 3, INFINITY);
if (to != INFINITY) janet_addtimeout(to);
janet_ev_recvfrom(stream, buffer, n, MSG_NOSIGNAL);
janet_await();
}
static Janet cfun_stream_write(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 3);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_WRITABLE | JANET_STREAM_SOCKET);
double to = janet_optnumber(argv, argc, 2, INFINITY);
if (janet_checktype(argv[1], JANET_BUFFER)) {
if (to != INFINITY) janet_addtimeout(to);
janet_ev_send_buffer(stream, janet_getbuffer(argv, 1), MSG_NOSIGNAL);
} else {
JanetByteView bytes = janet_getbytes(argv, 1);
if (to != INFINITY) janet_addtimeout(to);
janet_ev_send_string(stream, bytes.bytes, MSG_NOSIGNAL);
}
janet_await();
}
static Janet cfun_stream_send_to(int32_t argc, Janet *argv) {
janet_arity(argc, 3, 4);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_UDPSERVER | JANET_STREAM_SOCKET);
void *dest = janet_getabstract(argv, 1, &janet_address_type);
double to = janet_optnumber(argv, argc, 3, INFINITY);
if (janet_checktype(argv[2], JANET_BUFFER)) {
if (to != INFINITY) janet_addtimeout(to);
janet_ev_sendto_buffer(stream, janet_getbuffer(argv, 2), dest, MSG_NOSIGNAL);
} else {
JanetByteView bytes = janet_getbytes(argv, 2);
if (to != INFINITY) janet_addtimeout(to);
janet_ev_sendto_string(stream, bytes.bytes, dest, MSG_NOSIGNAL);
}
janet_await();
}
static Janet cfun_stream_flush(int32_t argc, Janet *argv) {
janet_fixarity(argc, 2);
JanetStream *stream = janet_getabstract(argv, 0, &janet_stream_type);
janet_stream_flags(stream, JANET_STREAM_WRITABLE | JANET_STREAM_SOCKET);
/* Toggle no delay flag */
int flag = 1;
setsockopt((JSock) stream->handle, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int));
flag = 0;
setsockopt((JSock) stream->handle, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int));
return argv[0];
}
static const JanetMethod net_stream_methods[] = {
{"chunk", cfun_stream_chunk},
{"close", janet_cfun_stream_close},
{"read", cfun_stream_read},
{"write", cfun_stream_write},
{"flush", cfun_stream_flush},
{"accept", cfun_stream_accept},
{"accept-loop", cfun_stream_accept_loop},
{"send-to", cfun_stream_send_to},
{"recv-from", cfun_stream_recv_from},
{"recv-from", cfun_stream_recv_from},
{"evread", janet_cfun_stream_read},
{"evchunk", janet_cfun_stream_chunk},
{"evwrite", janet_cfun_stream_write},
{NULL, NULL}
};
static JanetStream *make_stream(JSock handle, uint32_t flags) {
return janet_stream((JanetHandle) handle, flags | JANET_STREAM_SOCKET, net_stream_methods);
}
static const JanetReg net_cfuns[] = {
{
"net/address", cfun_net_sockaddr,
JDOC("(net/address host port &opt type)\n\n"
"Look up the connection information for a given hostname, port, and connection type. Returns "
"a handle that can be used to send datagrams over network without establishing a connection. "
"On Posix platforms, you can use :unix for host to connect to a unix domain socket, where the name is "
"given in the port argument. On Linux, abstract "
"unix domain sockets are specified with a leading '@' character in port.")
},
{
"net/listen", cfun_net_listen,
JDOC("(net/listen host port &opt type)\n\n"
"Creates a server. Returns a new stream that is neither readable nor "
"writeable. Use net/accept or net/accept-loop be to handle connections and start the server. "
"The type parameter specifies the type of network connection, either "
"a :stream (usually tcp), or :datagram (usually udp). If not specified, the default is "
":stream. The host and port arguments are the same as in net/address.")
},
{
"net/accept", cfun_stream_accept,
JDOC("(net/accept stream &opt timeout)\n\n"
"Get the next connection on a server stream. This would usually be called in a loop in a dedicated fiber. "
"Takes an optional timeout in seconds, after which will return nil. "
"Returns a new duplex stream which represents a connection to the client.")
},
{
"net/accept-loop", cfun_stream_accept_loop,
JDOC("(net/accept-loop stream handler)\n\n"
"Shorthand for running a server stream that will continuously accept new connections."
"Blocks the current fiber until the stream is closed, and will return the stream.")
},
{
"net/read", cfun_stream_read,
JDOC("(net/read stream nbytes &opt buf timeout)\n\n"
"Read up to n bytes from a stream, suspending the current fiber until the bytes are available. "
"`n` can also be the keyword `:all` to read into the buffer until end of stream. "
"If less than n bytes are available (and more than 0), will push those bytes and return early. "
"Takes an optional timeout in seconds, after which will return nil. "
"Returns a buffer with up to n more bytes in it, or raises an error if the read failed.")
},
{
"net/chunk", cfun_stream_chunk,
JDOC("(net/chunk stream nbytes &opt buf timeout)\n\n"
"Same a net/read, but will wait for all n bytes to arrive rather than return early. "
"Takes an optional timeout in seconds, after which will return nil.")
},
{
"net/write", cfun_stream_write,
JDOC("(net/write stream data &opt timeout)\n\n"
"Write data to a stream, suspending the current fiber until the write "
"completes. Takes an optional timeout in seconds, after which will return nil. "
"Returns nil, or raises an error if the write failed.")
},
{
"net/send-to", cfun_stream_send_to,
JDOC("(net/send-to stream dest data &opt timeout)\n\n"
"Writes a datagram to a server stream. dest is a the destination address of the packet. "
"Takes an optional timeout in seconds, after which will return nil. "
"Returns stream.")
},
{
"net/recv-from", cfun_stream_recv_from,
JDOC("(net/recv-from stream nbytes buf &opt timoeut)\n\n"
"Receives data from a server stream and puts it into a buffer. Returns the socket-address the "
"packet came from. Takes an optional timeout in seconds, after which will return nil.")
},
{
"net/flush", cfun_stream_flush,
JDOC("(net/flush stream)\n\n"
"Make sure that a stream is not buffering any data. This temporarily disables Nagle's algorithm. "
"Use this to make sure data is sent without delay. Returns stream.")
},
{
"net/connect", cfun_net_connect,
JDOC("(net/connect host port &opt type)\n\n"
"Open a connection to communicate with a server. Returns a duplex stream "
"that can be used to communicate with the server. Type is an optional keyword "
"to specify a connection type, either :stream or :datagram. The default is :stream. ")
},
{NULL, NULL, NULL}
};
void janet_lib_net(JanetTable *env) {
janet_core_cfuns(env, NULL, net_cfuns);
}
void janet_net_init(void) {
#ifdef JANET_WINDOWS
WSADATA wsaData;
janet_assert(!WSAStartup(MAKEWORD(2, 2), &wsaData), "could not start winsock");
#endif
}
void janet_net_deinit(void) {
#ifdef JANET_WINDOWS
WSACleanup();
#endif
}
#endif
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