a7f49ac9a1
Happy new year to the wonderful Godot community! We're starting a new decade with a well-established, non-profit, free and open source game engine, and tons of further improvements in the pipeline from hundreds of contributors. Godot will keep getting better, and we're looking forward to all the games that the community will keep developing and releasing with it.
366 lines
9.8 KiB
C++
366 lines
9.8 KiB
C++
/*************************************************************************/
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/* webrtc_data_channel_js.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifdef JAVASCRIPT_ENABLED
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#include "webrtc_data_channel_js.h"
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#include "emscripten.h"
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extern "C" {
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EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_error(void *obj) {
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WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj);
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peer->_on_error();
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}
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EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_open(void *obj) {
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WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj);
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peer->_on_open();
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}
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EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_close(void *obj) {
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WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj);
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peer->_on_close();
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}
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EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_message(void *obj, uint8_t *p_data, uint32_t p_size, bool p_is_string) {
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WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj);
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peer->_on_message(p_data, p_size, p_is_string);
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}
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}
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void WebRTCDataChannelJS::_on_open() {
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in_buffer.resize(_in_buffer_shift);
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}
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void WebRTCDataChannelJS::_on_close() {
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close();
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}
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void WebRTCDataChannelJS::_on_error() {
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close();
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}
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void WebRTCDataChannelJS::_on_message(uint8_t *p_data, uint32_t p_size, bool p_is_string) {
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ERR_FAIL_COND_MSG(in_buffer.space_left() < (int)(p_size + 5), "Buffer full! Dropping data.");
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uint8_t is_string = p_is_string ? 1 : 0;
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in_buffer.write((uint8_t *)&p_size, 4);
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in_buffer.write((uint8_t *)&is_string, 1);
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in_buffer.write(p_data, p_size);
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queue_count++;
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}
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void WebRTCDataChannelJS::close() {
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in_buffer.resize(0);
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queue_count = 0;
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_was_string = false;
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/* clang-format off */
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EM_ASM({
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var dict = Module.IDHandler.get($0);
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if (!dict) return;
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var channel = dict["channel"];
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channel.onopen = null;
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channel.onclose = null;
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channel.onerror = null;
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channel.onmessage = null;
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channel.close();
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}, _js_id);
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/* clang-format on */
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}
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Error WebRTCDataChannelJS::poll() {
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return OK;
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}
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WebRTCDataChannelJS::ChannelState WebRTCDataChannelJS::get_ready_state() const {
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/* clang-format off */
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return (ChannelState) EM_ASM_INT({
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var dict = Module.IDHandler.get($0);
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if (!dict) return 3; // CLOSED
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var channel = dict["channel"];
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switch(channel.readyState) {
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case "connecting":
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return 0;
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case "open":
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return 1;
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case "closing":
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return 2;
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case "closed":
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return 3;
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}
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return 3; // CLOSED
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}, _js_id);
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/* clang-format on */
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}
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int WebRTCDataChannelJS::get_available_packet_count() const {
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return queue_count;
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}
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Error WebRTCDataChannelJS::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
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ERR_FAIL_COND_V(get_ready_state() != STATE_OPEN, ERR_UNCONFIGURED);
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if (queue_count == 0)
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return ERR_UNAVAILABLE;
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uint32_t to_read = 0;
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uint32_t left = 0;
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uint8_t is_string = 0;
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r_buffer_size = 0;
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in_buffer.read((uint8_t *)&to_read, 4);
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--queue_count;
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left = in_buffer.data_left();
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if (left < to_read + 1) {
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in_buffer.advance_read(left);
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return FAILED;
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}
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in_buffer.read(&is_string, 1);
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_was_string = is_string == 1;
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in_buffer.read(packet_buffer, to_read);
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*r_buffer = packet_buffer;
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r_buffer_size = to_read;
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return OK;
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}
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Error WebRTCDataChannelJS::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
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ERR_FAIL_COND_V(get_ready_state() != STATE_OPEN, ERR_UNCONFIGURED);
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int is_bin = _write_mode == WebRTCDataChannel::WRITE_MODE_BINARY ? 1 : 0;
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/* clang-format off */
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EM_ASM({
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var dict = Module.IDHandler.get($0);
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var channel = dict["channel"];
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var bytes_array = new Uint8Array($2);
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var i = 0;
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for(i=0; i<$2; i++) {
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bytes_array[i] = getValue($1+i, 'i8');
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}
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if ($3) {
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channel.send(bytes_array.buffer);
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} else {
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var string = new TextDecoder("utf-8").decode(bytes_array);
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channel.send(string);
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}
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}, _js_id, p_buffer, p_buffer_size, is_bin);
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/* clang-format on */
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return OK;
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}
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int WebRTCDataChannelJS::get_max_packet_size() const {
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return 1200;
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}
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void WebRTCDataChannelJS::set_write_mode(WriteMode p_mode) {
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_write_mode = p_mode;
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}
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WebRTCDataChannel::WriteMode WebRTCDataChannelJS::get_write_mode() const {
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return _write_mode;
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}
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bool WebRTCDataChannelJS::was_string_packet() const {
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return _was_string;
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}
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String WebRTCDataChannelJS::get_label() const {
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return _label;
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}
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/* clang-format off */
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#define _JS_GET(PROP, DEF) \
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EM_ASM_INT({ \
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var dict = Module.IDHandler.get($0); \
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if (!dict || !dict["channel"]) { \
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return DEF; \
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} \
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var out = dict["channel"].PROP; \
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return out === null ? DEF : out; \
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}, _js_id)
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/* clang-format on */
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bool WebRTCDataChannelJS::is_ordered() const {
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return _JS_GET(ordered, true);
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}
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int WebRTCDataChannelJS::get_id() const {
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return _JS_GET(id, 65535);
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}
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int WebRTCDataChannelJS::get_max_packet_life_time() const {
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// Can't use macro, webkit workaround.
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/* clang-format off */
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return EM_ASM_INT({
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var dict = Module.IDHandler.get($0);
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if (!dict || !dict["channel"]) {
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return 65535;
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}
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if (dict["channel"].maxRetransmitTime !== undefined) {
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// Guess someone didn't appreciate the standardization process.
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return dict["channel"].maxRetransmitTime;
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}
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var out = dict["channel"].maxPacketLifeTime;
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return out === null ? 65535 : out;
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}, _js_id);
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/* clang-format on */
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}
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int WebRTCDataChannelJS::get_max_retransmits() const {
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return _JS_GET(maxRetransmits, 65535);
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}
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String WebRTCDataChannelJS::get_protocol() const {
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return _protocol;
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}
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bool WebRTCDataChannelJS::is_negotiated() const {
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return _JS_GET(negotiated, false);
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}
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WebRTCDataChannelJS::WebRTCDataChannelJS() {
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queue_count = 0;
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_was_string = false;
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_write_mode = WRITE_MODE_BINARY;
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_js_id = 0;
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}
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WebRTCDataChannelJS::WebRTCDataChannelJS(int js_id) {
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queue_count = 0;
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_was_string = false;
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_write_mode = WRITE_MODE_BINARY;
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_js_id = js_id;
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/* clang-format off */
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EM_ASM({
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var c_ptr = $0;
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var dict = Module.IDHandler.get($1);
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if (!dict) return;
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var channel = dict["channel"];
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dict["ptr"] = c_ptr;
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channel.binaryType = "arraybuffer";
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channel.onopen = function (evt) {
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ccall("_emrtc_on_ch_open",
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"void",
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["number"],
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[c_ptr]
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);
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};
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channel.onclose = function (evt) {
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ccall("_emrtc_on_ch_close",
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"void",
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["number"],
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[c_ptr]
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);
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};
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channel.onerror = function (evt) {
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ccall("_emrtc_on_ch_error",
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"void",
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["number"],
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[c_ptr]
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);
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};
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channel.onmessage = function(event) {
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var buffer;
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var is_string = 0;
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if (event.data instanceof ArrayBuffer) {
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buffer = new Uint8Array(event.data);
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} else if (event.data instanceof Blob) {
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console.error("Blob type not supported");
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return;
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} else if (typeof event.data === "string") {
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is_string = 1;
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var enc = new TextEncoder("utf-8");
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buffer = new Uint8Array(enc.encode(event.data));
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} else {
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console.error("Unknown message type");
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return;
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}
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var len = buffer.length*buffer.BYTES_PER_ELEMENT;
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var out = Module._malloc(len);
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Module.HEAPU8.set(buffer, out);
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ccall("_emrtc_on_ch_message",
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"void",
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["number", "number", "number", "number"],
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[c_ptr, out, len, is_string]
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);
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Module._free(out);
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}
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}, this, js_id);
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// Parse label
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char *str;
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str = (char *)EM_ASM_INT({
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var dict = Module.IDHandler.get($0);
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if (!dict || !dict["channel"]) return 0;
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var str = dict["channel"].label;
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var len = lengthBytesUTF8(str)+1;
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var ptr = _malloc(str);
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stringToUTF8(str, ptr, len+1);
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return ptr;
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}, js_id);
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if(str != NULL) {
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_label.parse_utf8(str);
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EM_ASM({ _free($0) }, str);
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}
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str = (char *)EM_ASM_INT({
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var dict = Module.IDHandler.get($0);
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if (!dict || !dict["channel"]) return 0;
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var str = dict["channel"].protocol;
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var len = lengthBytesUTF8(str)+1;
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var ptr = _malloc(str);
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stringToUTF8(str, ptr, len+1);
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return ptr;
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}, js_id);
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if(str != NULL) {
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_protocol.parse_utf8(str);
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EM_ASM({ _free($0) }, str);
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}
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/* clang-format on */
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}
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WebRTCDataChannelJS::~WebRTCDataChannelJS() {
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close();
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/* clang-format off */
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EM_ASM({
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Module.IDHandler.remove($0);
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}, _js_id);
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/* clang-format on */
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};
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#endif
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