void h2o_websocket_proceed(h2o_websocket_conn_t *conn)
{
int handled;
/* run the loop until getting to a point where no more progress can be achieved */
do {
handled = 0;
if (!h2o_socket_is_writing(conn->sock) && wslay_event_want_write(conn->ws_ctx)) {
if (wslay_event_send(conn->ws_ctx) != 0) {
goto Close;
}
handled = 1;
}
if (conn->sock->input->size != 0 && wslay_event_want_read(conn->ws_ctx)) {
if (wslay_event_recv(conn->ws_ctx) != 0) {
goto Close;
}
handled = 1;
}
} while (handled);
if (wslay_event_want_read(conn->ws_ctx)) {
h2o_socket_read_start(conn->sock, on_recv);
} else if (h2o_socket_is_writing(conn->sock) || wslay_event_want_write(conn->ws_ctx)) {
h2o_socket_read_stop(conn->sock);
} else {
/* nothing is going on... close the socket */
goto Close;
}
return;
Close:
on_close(conn);
}
void h2o_websocket_proceed(h2o_websocket_conn_t *conn)
{
int handled;
/* run the loop until getting to a point where no more progress can be achieved */
do {
handled = 0;
if (!h2o_socket_is_writing(conn->sock) && wslay_event_want_write(conn->ws_ctx)) {
if (wslay_event_send(conn->ws_ctx) != 0) {
goto Close;
}
/* avoid infinite loop when user want send more bufers count than ours in on_msg_callback() */
if (conn->_write_buf.cnt < sizeof(conn->_write_buf.bufs) / sizeof(conn->_write_buf.bufs[0])) {
handled = 1;
}
}
if (conn->sock->input->size != 0 && wslay_event_want_read(conn->ws_ctx)) {
if (wslay_event_recv(conn->ws_ctx) != 0) {
goto Close;
}
handled = 1;
}
} while (handled);
if (!h2o_socket_is_writing(conn->sock) && conn->_write_buf.cnt > 0) {
/* write */
h2o_socket_write(conn->sock, conn->_write_buf.bufs, conn->_write_buf.cnt, on_write_complete);
}
if (wslay_event_want_read(conn->ws_ctx)) {
h2o_socket_read_start(conn->sock, on_recv);
} else if (h2o_socket_is_writing(conn->sock) || wslay_event_want_write(conn->ws_ctx)) {
h2o_socket_read_stop(conn->sock);
} else {
/* nothing is going on... close the socket */
goto Close;
}
return;
Close:
on_close(conn);
}
HIDDEN void ws_output(struct transaction_t *txn)
{
struct ws_context *ctx = (struct ws_context *) txn->ws_ctx;
wslay_event_context_ptr ev = ctx->event;
int want_write = wslay_event_want_write(ev);
syslog(LOG_DEBUG, "ws_output() eof: %d, want write: %d",
txn->conn->pin->eof, want_write);
if (want_write) {
/* Send queued frame(s) */
int r = wslay_event_send(ev);
if (r) {
syslog(LOG_ERR, "wslay_event_send: %s", wslay_strerror(r));
txn->flags.conn = CONN_CLOSE;
}
}
}
int websocket_handler(websocket_t *websocket)
{
int r;
int fd = websocket->fd;
int timeout = 0;
fd_set read_fds;
fd_set write_fds;
wslay_event_context_ptr ctx = (wslay_event_context_ptr) websocket->ctx;
struct timeval tv;
while (websocket->state != WEBSOCKET_STOP) {
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
if (wslay_event_want_read(ctx)) {
FD_SET(fd, &read_fds);
}
if (wslay_event_want_write(ctx)) {
FD_SET(fd, &write_fds);
}
tv.tv_sec = (WEBSOCKET_HANDLER_TIMEOUT / 1000);
tv.tv_usec = ((WEBSOCKET_HANDLER_TIMEOUT % 1000) * 1000);
r = select(fd + 1, &read_fds, &write_fds, NULL, &tv);
if (r < 0) {
if (errno == EAGAIN || errno == EBUSY || errno == EINTR) {
continue;
}
WEBSOCKET_DEBUG("select function returned errno == %d\n", errno);
return WEBSOCKET_SOCKET_ERROR;
} else if (r == 0) {
if (WEBSOCKET_HANDLER_TIMEOUT != 0) {
timeout++;
if ((WEBSOCKET_HANDLER_TIMEOUT * timeout) >= (WEBSOCKET_PING_INTERVAL * 10)) {
timeout = 0;
if (websocket_ping_counter(websocket) != WEBSOCKET_SUCCESS) {
return WEBSOCKET_SOCKET_ERROR;
}
}
}
continue;
} else {
timeout = 0;
if (FD_ISSET(fd, &read_fds)) {
r = wslay_event_recv(ctx);
if (r != WEBSOCKET_SUCCESS) {
WEBSOCKET_DEBUG("fail to process recv event, result : %d\n", r);
websocket_update_state(websocket, WEBSOCKET_ERROR);
return WEBSOCKET_SOCKET_ERROR;
}
}
if (FD_ISSET(fd, &write_fds)) {
r = wslay_event_send(ctx);
if (r != WEBSOCKET_SUCCESS) {
WEBSOCKET_DEBUG("fail to process send event, result : %d\n", r);
websocket_update_state(websocket, WEBSOCKET_ERROR);
return WEBSOCKET_SOCKET_ERROR;
}
}
}
}
return WEBSOCKET_SUCCESS;
}
/*
* Communicate with the client. This function performs HTTP handshake
* and WebSocket data transfer until close handshake is done or an
* error occurs. *fd* is the file descriptor of the connection to the
* client. This function returns 0 if it succeeds, or returns 0.
*/
int communicate(int fd)
{
wslay_event_context_ptr ctx;
struct wslay_event_callbacks callbacks = {
recv_callback,
send_callback,
NULL,
NULL,
NULL,
NULL,
on_msg_recv_callback
};
struct Session session = { fd };
int val = 1;
struct pollfd event;
int res = 0;
if(http_handshake(fd) == -1) {
return -1;
}
if(make_non_block(fd) == -1) {
return -1;
}
if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, (socklen_t)sizeof(val))
== -1) {
perror("setsockopt: TCP_NODELAY");
return -1;
}
memset(&event, 0, sizeof(struct pollfd));
event.fd = fd;
event.events = POLLIN;
wslay_event_context_server_init(&ctx, &callbacks, &session);
/*
* Event loop: basically loop until both wslay_event_want_read(ctx)
* and wslay_event_want_write(ctx) return 0.
*/
while(wslay_event_want_read(ctx) || wslay_event_want_write(ctx)) {
int r;
while((r = poll(&event, 1, -1)) == -1 && errno == EINTR);
if(r == -1) {
perror("poll");
res = -1;
break;
}
if(((event.revents & POLLIN) && wslay_event_recv(ctx) != 0) ||
((event.revents & POLLOUT) && wslay_event_send(ctx) != 0) ||
(event.revents & (POLLERR | POLLHUP | POLLNVAL))) {
/*
* If either wslay_event_recv() or wslay_event_send() return
* non-zero value, it means serious error which prevents wslay
* library from processing further data, so WebSocket connection
* must be closed.
*/
res = -1;
break;
}
event.events = 0;
if(wslay_event_want_read(ctx)) {
event.events |= POLLIN;
}
if(wslay_event_want_write(ctx)) {
event.events |= POLLOUT;
}
}
return res;
}
static mrb_value
mrb_wslay_event_want_write(mrb_state *mrb, mrb_value self)
{
return mrb_bool_value(wslay_event_want_write(((mrb_wslay_user_data *) DATA_PTR(self))->ctx));
}
bool want_write()
{
return wslay_event_want_write(ctx_);
}
/**
* \brief The function with WebSocket infinite loop
*/
void *vs_websocket_loop(void *arg)
{
/* The vContext is passed as *user_data* in callback functions. */
struct vContext *C = (struct vContext*)arg;
struct VS_CTX *vs_ctx = CTX_server_ctx(C);
struct IO_CTX *io_ctx = CTX_io_ctx(C);
struct VStreamConn *stream_conn = CTX_current_stream_conn(C);
struct VSession *vsession = CTX_current_session(C);
struct VMessage *r_message=NULL, *s_message=NULL;
wslay_event_context_ptr wslay_ctx;
fd_set read_set, write_set;
struct timeval tv;
int ret, flags;
unsigned int int_size;
struct wslay_event_callbacks callbacks = {
vs_recv_ws_callback_data,
vs_send_ws_callback_data,
NULL,
NULL,
NULL,
NULL,
vs_ws_recv_msg_callback
};
vsession->flags |= VRS_TP_WEBSOCKET;
/* Set socket non-blocking */
flags = fcntl(io_ctx->sockfd, F_GETFL, 0);
if( fcntl(io_ctx->sockfd, F_SETFL, flags | O_NONBLOCK) == -1) {
v_print_log(VRS_PRINT_ERROR, "fcntl(): %s\n", strerror(errno));
goto end;
}
/* Listen for HTTP request from web client and try to do
* WebSocket handshake */
if(http_handshake(io_ctx->sockfd) != 0 ) {
goto end;
}
/* Try to get size of TCP buffer */
int_size = sizeof(int_size);
if( getsockopt(io_ctx->sockfd, SOL_SOCKET, SO_RCVBUF,
(void *)&stream_conn->socket_buffer_size, &int_size) != 0)
{
v_print_log(VRS_PRINT_ERROR,
"Unable to get TCP buffer size of WebSocket connection.\n");
goto end;
}
r_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
s_message = (struct VMessage*)calloc(1, sizeof(struct VMessage));
if(r_message == NULL || s_message == NULL) {
v_print_log(VRS_PRINT_ERROR, "Out of memory\n");
goto end;
}
CTX_r_message_set(C, r_message);
CTX_s_message_set(C, s_message);
/* Try to initialize WebSocket server context */
if(wslay_event_context_server_init(&wslay_ctx, &callbacks, C) != 0) {
v_print_log(VRS_PRINT_ERROR,
"Unable to initialize WebSocket server context\n");
goto end;
}
/* Set initial state */
stream_conn->host_state = TCP_SERVER_STATE_RESPOND_METHODS;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG,
"Server WebSocket state: RESPOND_methods\n");
printf("%c[%dm", 27, 0);
}
/* "Never ending" loop */
while(vsession->stream_conn->host_state != TCP_SERVER_STATE_CLOSED &&
( wslay_event_want_read(wslay_ctx) == 1 ||
wslay_event_want_write(wslay_ctx) == 1) )
{
/* When server is going to stop, then close connection with WebSocket
* client */
if(vs_ctx->state != SERVER_STATE_READY) {
v_print_log(VRS_PRINT_DEBUG_MSG,
"Closing WebSocket connection: Server shutdown\n");
stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
/* Try to close connection with WebSocket client */
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_GOING_AWAY,
(uint8_t*)"Server shutdown", /* Close message */
15); /* The length of close message s*/
}
/* Initialize read set */
FD_ZERO(&read_set);
if(wslay_event_want_read(wslay_ctx) == 1) {
/*
v_print_log(VRS_PRINT_DEBUG_MSG,
"Waiting for WebSocket message ...\n");
*/
FD_SET(io_ctx->sockfd, &read_set);
}
/* Initialize write set */
FD_ZERO(&write_set);
if(wslay_event_want_write(wslay_ctx) == 1) {
#if DEBUG_WEB_SOCKET
v_print_log(VRS_PRINT_DEBUG_MSG,
"Going to write message to WebSocket ...\n");
#endif
FD_SET(io_ctx->sockfd, &write_set);
}
/* Set timeout for select() */
if(stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
/* Use negotiated FPS */
tv.tv_sec = 0;
tv.tv_usec = 1000000/vsession->fps_host;
} else {
/* User have to send something in 30 seconds */
tv.tv_sec = VRS_TIMEOUT;
tv.tv_usec = 0;
}
if( (ret = select(io_ctx->sockfd + 1,
&read_set,
&write_set,
NULL, /* Don't care about exception */
&tv)) == -1) {
v_print_log(VRS_PRINT_ERROR, "%s:%s():%d select(): %s\n",
__FILE__, __FUNCTION__, __LINE__, strerror(errno));
goto end;
/* Was event on the listen socket */
} else if(ret > 0) {
if(FD_ISSET(io_ctx->sockfd, &read_set)) {
if( wslay_event_recv(wslay_ctx) != 0 ) {
goto end;
}
}
if (FD_ISSET(io_ctx->sockfd, &write_set)) {
if( wslay_event_send(wslay_ctx) != 0 ) {
goto end;
}
}
} else if(ret == 0 && stream_conn->host_state != TCP_SERVER_STATE_STREAM_OPEN) {
/* When handshake is not finished during VRS_TIMEOT seconds, then
* close connection with WebSocket client. */
v_print_log(VRS_PRINT_DEBUG_MSG,
"Closing WebSocket connection: Handshake timed-out\n");
stream_conn->host_state = TCP_SERVER_STATE_CLOSING;
wslay_event_queue_close(wslay_ctx,
WSLAY_CODE_PROTOCOL_ERROR,
(uint8_t*)"Handshake timed-out", /* Close message */
19); /* The length of close message */
}
if(stream_conn->host_state == TCP_SERVER_STATE_STREAM_OPEN) {
/* Check if there is any command in outgoing queue
* and eventually pack these commands to buffer */
if((ret = v_STREAM_pack_message(C)) == 0 ) {
goto end;
}
/* When at least one command was packed to buffer, then
* queue this buffer to WebSocket layer */
if(ret == 1) {
struct wslay_event_msg msgarg;
msgarg.opcode = WSLAY_BINARY_FRAME;
msgarg.msg = (uint8_t*)io_ctx->buf;
msgarg.msg_length = io_ctx->buf_size;
wslay_event_queue_msg(wslay_ctx, &msgarg);
}
}
}
end:
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server WebSocket state: CLOSING\n");
printf("%c[%dm", 27, 0);
}
/* Set up TCP CLOSING state (non-blocking) */
vs_CLOSING(C);
/* Receive and Send messages are not necessary any more */
if(r_message != NULL) {
free(r_message);
r_message = NULL;
CTX_r_message_set(C, NULL);
}
if(s_message != NULL) {
free(s_message);
s_message = NULL;
CTX_s_message_set(C, NULL);
}
/* TCP connection is considered as CLOSED, but it is not possible to use
* this connection for other client */
stream_conn->host_state = TCP_SERVER_STATE_CLOSED;
/* NULL pointer at stream connection */
CTX_current_stream_conn_set(C, NULL);
/* Set TCP connection to CLOSED */
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server WebSocket state: CLOSED\n");
printf("%c[%dm", 27, 0);
}
pthread_mutex_lock(&vs_ctx->data.mutex);
/* Unsubscribe this session (this avatar) from all nodes */
vs_node_free_avatar_reference(vs_ctx, vsession);
/* Try to destroy avatar node */
vs_node_destroy_avatar_node(vs_ctx, vsession);
pthread_mutex_unlock(&vs_ctx->data.mutex);
/* This session could be used again for authentication */
stream_conn->host_state = TCP_SERVER_STATE_LISTEN;
/* Clear session flags */
vsession->flags = 0;
if(is_log_level(VRS_PRINT_DEBUG_MSG)) {
printf("%c[%d;%dm", 27, 1, 31);
v_print_log(VRS_PRINT_DEBUG_MSG, "Server WebSocket state: LISTEN\n");
printf("%c[%dm", 27, 0);
}
free(C);
C = NULL;
pthread_exit(NULL);
return NULL;
}
HIDDEN void ws_input(struct transaction_t *txn)
{
struct ws_context *ctx = (struct ws_context *) txn->ws_ctx;
wslay_event_context_ptr ev = ctx->event;
int want_read = wslay_event_want_read(ev);
int want_write = wslay_event_want_write(ev);
int goaway = txn->flags.conn & CONN_CLOSE;
syslog(LOG_DEBUG, "ws_input() eof: %d, want read: %d, want write: %d",
txn->conn->pin->eof, want_read, want_write);
if (want_read && !goaway) {
/* Read frame(s) */
if (txn->conn->sess_ctx) {
/* Data has been read into request body */
ctx->h2_pin = prot_readmap(buf_base(&txn->req_body.payload),
buf_len(&txn->req_body.payload));
}
int r = wslay_event_recv(ev);
if (txn->conn->sess_ctx) {
buf_reset(&txn->req_body.payload);
prot_free(ctx->h2_pin);
}
if (!r) {
/* Successfully received frames */
syslog(LOG_DEBUG, "ws_event_recv: success");
}
else if (r == WSLAY_ERR_NO_MORE_MSG) {
/* Client closed connection */
syslog(LOG_DEBUG, "client closed connection");
txn->flags.conn = CONN_CLOSE;
}
else {
/* Failure */
syslog(LOG_DEBUG, "ws_event_recv: %s (%s)",
wslay_strerror(r), prot_error(txn->conn->pin));
goaway = 1;
if (r == WSLAY_ERR_CALLBACK_FAILURE) {
/* Client timeout */
txn->error.desc = prot_error(txn->conn->pin);
}
else {
txn->error.desc = wslay_strerror(r);
}
}
}
else if (!want_write) {
/* Connection is done */
syslog(LOG_DEBUG, "connection closed");
txn->flags.conn = CONN_CLOSE;
}
if (goaway) {
/* Tell client we are closing session */
syslog(LOG_WARNING, "%s, closing connection", txn->error.desc);
syslog(LOG_DEBUG, "wslay_event_queue_close()");
int r = wslay_event_queue_close(ev, WSLAY_CODE_GOING_AWAY,
(uint8_t *) txn->error.desc,
strlen(txn->error.desc));
if (r) {
syslog(LOG_ERR,
"wslay_event_queue_close: %s", wslay_strerror(r));
}
txn->flags.conn = CONN_CLOSE;
}
/* Write frame(s) */
ws_output(txn);
return;
}