/*************************************************************************/ /* webrtc_data_channel_js.cpp */ /*************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /*************************************************************************/ /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */ /* Copyright (c) 2014-2020 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" { EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_error(void *obj) { WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj); peer->_on_error(); } EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_open(void *obj) { WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj); peer->_on_open(); } EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_close(void *obj) { WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj); peer->_on_close(); } EMSCRIPTEN_KEEPALIVE void _emrtc_on_ch_message(void *obj, uint8_t *p_data, uint32_t p_size, bool p_is_string) { WebRTCDataChannelJS *peer = static_cast<WebRTCDataChannelJS *>(obj); peer->_on_message(p_data, p_size, p_is_string); } } void WebRTCDataChannelJS::_on_open() { in_buffer.resize(_in_buffer_shift); } void WebRTCDataChannelJS::_on_close() { close(); } void WebRTCDataChannelJS::_on_error() { close(); } void WebRTCDataChannelJS::_on_message(uint8_t *p_data, uint32_t p_size, bool p_is_string) { 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); queue_count++; } void WebRTCDataChannelJS::close() { in_buffer.resize(0); queue_count = 0; _was_string = false; /* clang-format off */ EM_ASM({ var dict = Module.IDHandler.get($0); if (!dict) return; var channel = dict["channel"]; channel.onopen = null; channel.onclose = null; channel.onerror = null; channel.onmessage = null; channel.close(); }, _js_id); /* clang-format on */ } Error WebRTCDataChannelJS::poll() { return OK; } WebRTCDataChannelJS::ChannelState WebRTCDataChannelJS::get_ready_state() const { /* clang-format off */ return (ChannelState) EM_ASM_INT({ var dict = Module.IDHandler.get($0); if (!dict) return 3; // CLOSED var channel = dict["channel"]; switch(channel.readyState) { case "connecting": return 0; case "open": return 1; case "closing": return 2; case "closed": return 3; } return 3; // CLOSED }, _js_id); /* clang-format on */ } 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; /* clang-format off */ EM_ASM({ var dict = Module.IDHandler.get($0); var channel = dict["channel"]; var bytes_array = new Uint8Array($2); var i = 0; for(i=0; i<$2; i++) { bytes_array[i] = getValue($1+i, 'i8'); } if ($3) { channel.send(bytes_array.buffer); } else { var string = new TextDecoder("utf-8").decode(bytes_array); channel.send(string); } }, _js_id, p_buffer, p_buffer_size, is_bin); /* clang-format on */ 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; } /* clang-format off */ #define _JS_GET(PROP, DEF) \ EM_ASM_INT({ \ var dict = Module.IDHandler.get($0); \ if (!dict || !dict["channel"]) { \ return DEF; \ } \ var out = dict["channel"].PROP; \ return out === null ? DEF : out; \ }, _js_id) /* clang-format on */ bool WebRTCDataChannelJS::is_ordered() const { return _JS_GET(ordered, true); } int WebRTCDataChannelJS::get_id() const { return _JS_GET(id, 65535); } int WebRTCDataChannelJS::get_max_packet_life_time() const { // Can't use macro, webkit workaround. /* clang-format off */ return EM_ASM_INT({ var dict = Module.IDHandler.get($0); if (!dict || !dict["channel"]) { return 65535; } if (dict["channel"].maxRetransmitTime !== undefined) { // Guess someone didn't appreciate the standardization process. return dict["channel"].maxRetransmitTime; } var out = dict["channel"].maxPacketLifeTime; return out === null ? 65535 : out; }, _js_id); /* clang-format on */ } int WebRTCDataChannelJS::get_max_retransmits() const { return _JS_GET(maxRetransmits, 65535); } String WebRTCDataChannelJS::get_protocol() const { return _protocol; } bool WebRTCDataChannelJS::is_negotiated() const { return _JS_GET(negotiated, false); } 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; /* clang-format off */ EM_ASM({ var c_ptr = $0; var dict = Module.IDHandler.get($1); if (!dict) return; var channel = dict["channel"]; dict["ptr"] = c_ptr; channel.binaryType = "arraybuffer"; channel.onopen = function (evt) { ccall("_emrtc_on_ch_open", "void", ["number"], [c_ptr] ); }; channel.onclose = function (evt) { ccall("_emrtc_on_ch_close", "void", ["number"], [c_ptr] ); }; channel.onerror = function (evt) { ccall("_emrtc_on_ch_error", "void", ["number"], [c_ptr] ); }; channel.onmessage = function(event) { var buffer; var is_string = 0; if (event.data instanceof ArrayBuffer) { buffer = new Uint8Array(event.data); } else if (event.data instanceof Blob) { console.error("Blob type not supported"); return; } else if (typeof event.data === "string") { is_string = 1; var enc = new TextEncoder("utf-8"); buffer = new Uint8Array(enc.encode(event.data)); } else { console.error("Unknown message type"); return; } var len = buffer.length*buffer.BYTES_PER_ELEMENT; var out = _malloc(len); HEAPU8.set(buffer, out); ccall("_emrtc_on_ch_message", "void", ["number", "number", "number", "number"], [c_ptr, out, len, is_string] ); _free(out); } }, this, js_id); // Parse label char *str; str = (char *)EM_ASM_INT({ var dict = Module.IDHandler.get($0); if (!dict || !dict["channel"]) return 0; var str = dict["channel"].label; var len = lengthBytesUTF8(str)+1; var ptr = _malloc(str); stringToUTF8(str, ptr, len+1); return ptr; }, js_id); if(str != nullptr) { _label.parse_utf8(str); EM_ASM({ _free($0) }, str); } str = (char *)EM_ASM_INT({ var dict = Module.IDHandler.get($0); if (!dict || !dict["channel"]) return 0; var str = dict["channel"].protocol; var len = lengthBytesUTF8(str)+1; var ptr = _malloc(str); stringToUTF8(str, ptr, len+1); return ptr; }, js_id); if(str != nullptr) { _protocol.parse_utf8(str); EM_ASM({ _free($0) }, str); } /* clang-format on */ } WebRTCDataChannelJS::~WebRTCDataChannelJS() { close(); /* clang-format off */ EM_ASM({ Module.IDHandler.remove($0); }, _js_id); /* clang-format on */ }; #endif