diff options
Diffstat (limited to 'modules/webrtc/webrtc_data_channel_js.cpp')
| -rw-r--r-- | modules/webrtc/webrtc_data_channel_js.cpp | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/modules/webrtc/webrtc_data_channel_js.cpp b/modules/webrtc/webrtc_data_channel_js.cpp new file mode 100644 index 0000000000..2e7c64aa72 --- /dev/null +++ b/modules/webrtc/webrtc_data_channel_js.cpp @@ -0,0 +1,352 @@ +/*************************************************************************/ +/* webrtc_data_channel_js.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2019 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(16); +} + +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) { + if (in_buffer.space_left() < p_size + 5) { + ERR_EXPLAIN("Buffer full! Dropping data"); + ERR_FAIL(); + } + + 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) \ +EM_ASM_INT({ \ + var dict = Module.IDHandler.get($0); \ + if (!dict || !dict["channel"]) { \ + return 0; \ + }; \ + return dict["channel"].PROP; \ +}, _js_id) +/* clang-format on */ + +bool WebRTCDataChannelJS::is_ordered() const { + return _JS_GET(ordered); +} + +int WebRTCDataChannelJS::get_id() const { + return _JS_GET(id); +} + +int WebRTCDataChannelJS::get_max_packet_life_time() const { + return _JS_GET(maxPacketLifeTime); +} + +int WebRTCDataChannelJS::get_max_retransmits() const { + return _JS_GET(maxRetransmits); +} + +String WebRTCDataChannelJS::get_protocol() const { + return _protocol; +} + +bool WebRTCDataChannelJS::is_negotiated() const { + return _JS_GET(negotiated); +} + +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 = Module._malloc(len); + Module.HEAPU8.set(buffer, out); + ccall("_emrtc_on_ch_message", + "void", + ["number", "number", "number", "number"], + [c_ptr, out, len, is_string] + ); + Module._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 != NULL) { + _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 != NULL) { + _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 |