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/*************************************************************************/
/* webrtc_data_channel_js.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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. */
/*************************************************************************/
#ifdef JAVASCRIPT_ENABLED
#include "webrtc_data_channel_js.h"
#include "emscripten.h"
extern "C" {
typedef void (*RTCChOnOpen)(void *p_obj);
typedef void (*RTCChOnMessage)(void *p_obj, const uint8_t *p_buffer, int p_size, int p_is_string);
typedef void (*RTCChOnClose)(void *p_obj);
typedef void (*RTCChOnError)(void *p_obj);
extern int godot_js_rtc_datachannel_ready_state_get(int p_id);
extern int godot_js_rtc_datachannel_send(int p_id, const uint8_t *p_buffer, int p_length, int p_raw);
extern int godot_js_rtc_datachannel_is_ordered(int p_id);
extern int godot_js_rtc_datachannel_id_get(int p_id);
extern int godot_js_rtc_datachannel_max_packet_lifetime_get(int p_id);
extern int godot_js_rtc_datachannel_max_retransmits_get(int p_id);
extern int godot_js_rtc_datachannel_is_negotiated(int p_id);
extern char *godot_js_rtc_datachannel_label_get(int p_id); // Must free the returned string.
extern char *godot_js_rtc_datachannel_protocol_get(int p_id); // Must free the returned string.
extern void godot_js_rtc_datachannel_destroy(int p_id);
extern void godot_js_rtc_datachannel_connect(int p_id, void *p_obj, RTCChOnOpen p_on_open, RTCChOnMessage p_on_message, RTCChOnError p_on_error, RTCChOnClose p_on_close);
extern void godot_js_rtc_datachannel_close(int p_id);
}
void WebRTCDataChannelJS::_on_open(void *p_obj) {
WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(p_obj);
peer->in_buffer.resize(peer->_in_buffer_shift);
}
void WebRTCDataChannelJS::_on_close(void *p_obj) {
WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(p_obj);
peer->close();
}
void WebRTCDataChannelJS::_on_error(void *p_obj) {
WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(p_obj);
peer->close();
}
void WebRTCDataChannelJS::_on_message(void *p_obj, const uint8_t *p_data, int p_size, int p_is_string) {
WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(p_obj);
RingBuffer<uint8_t> &in_buffer = peer->in_buffer;
ERR_FAIL_COND_MSG(in_buffer.space_left() < (int)(p_size + 5), "Buffer full! Dropping data.");
uint8_t is_string = p_is_string ? 1 : 0;
in_buffer.write((uint8_t *)&p_size, 4);
in_buffer.write((uint8_t *)&is_string, 1);
in_buffer.write(p_data, p_size);
peer->queue_count++;
}
void WebRTCDataChannelJS::close() {
in_buffer.resize(0);
queue_count = 0;
_was_string = false;
godot_js_rtc_datachannel_close(_js_id);
}
Error WebRTCDataChannelJS::poll() {
return OK;
}
WebRTCDataChannelJS::ChannelState WebRTCDataChannelJS::get_ready_state() const {
return (ChannelState)godot_js_rtc_datachannel_ready_state_get(_js_id);
}
int WebRTCDataChannelJS::get_available_packet_count() const {
return queue_count;
}
Error WebRTCDataChannelJS::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
ERR_FAIL_COND_V(get_ready_state() != STATE_OPEN, ERR_UNCONFIGURED);
if (queue_count == 0)
return ERR_UNAVAILABLE;
uint32_t to_read = 0;
uint32_t left = 0;
uint8_t is_string = 0;
r_buffer_size = 0;
in_buffer.read((uint8_t *)&to_read, 4);
--queue_count;
left = in_buffer.data_left();
if (left < to_read + 1) {
in_buffer.advance_read(left);
return FAILED;
}
in_buffer.read(&is_string, 1);
_was_string = is_string == 1;
in_buffer.read(packet_buffer, to_read);
*r_buffer = packet_buffer;
r_buffer_size = to_read;
return OK;
}
Error WebRTCDataChannelJS::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(get_ready_state() != STATE_OPEN, ERR_UNCONFIGURED);
int is_bin = _write_mode == WebRTCDataChannel::WRITE_MODE_BINARY ? 1 : 0;
godot_js_rtc_datachannel_send(_js_id, p_buffer, p_buffer_size, is_bin);
return OK;
}
int WebRTCDataChannelJS::get_max_packet_size() const {
return 1200;
}
void WebRTCDataChannelJS::set_write_mode(WriteMode p_mode) {
_write_mode = p_mode;
}
WebRTCDataChannel::WriteMode WebRTCDataChannelJS::get_write_mode() const {
return _write_mode;
}
bool WebRTCDataChannelJS::was_string_packet() const {
return _was_string;
}
String WebRTCDataChannelJS::get_label() const {
return _label;
}
bool WebRTCDataChannelJS::is_ordered() const {
return godot_js_rtc_datachannel_is_ordered(_js_id);
}
int WebRTCDataChannelJS::get_id() const {
return godot_js_rtc_datachannel_id_get(_js_id);
}
int WebRTCDataChannelJS::get_max_packet_life_time() const {
return godot_js_rtc_datachannel_max_packet_lifetime_get(_js_id);
}
int WebRTCDataChannelJS::get_max_retransmits() const {
return godot_js_rtc_datachannel_max_retransmits_get(_js_id);
}
String WebRTCDataChannelJS::get_protocol() const {
return _protocol;
}
bool WebRTCDataChannelJS::is_negotiated() const {
return godot_js_rtc_datachannel_is_negotiated(_js_id);
}
WebRTCDataChannelJS::WebRTCDataChannelJS() {
queue_count = 0;
_was_string = false;
_write_mode = WRITE_MODE_BINARY;
_js_id = 0;
}
WebRTCDataChannelJS::WebRTCDataChannelJS(int js_id) {
queue_count = 0;
_was_string = false;
_write_mode = WRITE_MODE_BINARY;
_js_id = js_id;
godot_js_rtc_datachannel_connect(js_id, this, &_on_open, &_on_message, &_on_error, &_on_close);
// Parse label
char *label = godot_js_rtc_datachannel_label_get(js_id);
if (label) {
_label.parse_utf8(label);
free(label);
}
char *protocol = godot_js_rtc_datachannel_protocol_get(js_id);
if (protocol) {
_protocol.parse_utf8(protocol);
free(protocol);
}
}
WebRTCDataChannelJS::~WebRTCDataChannelJS() {
close();
godot_js_rtc_datachannel_destroy(_js_id);
}
#endif
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