godot/core/io/packet_peer.cpp
2021-06-17 19:10:26 -04:00

299 lines
10 KiB
C++

/*************************************************************************/
/* packet_peer.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. */
/*************************************************************************/
#include "packet_peer.h"
#include "core/config/project_settings.h"
#include "core/io/marshalls.h"
/* helpers / binders */
void PacketPeer::set_encode_buffer_max_size(int p_max_size) {
ERR_FAIL_COND_MSG(p_max_size < 1024, "Max encode buffer must be at least 1024 bytes");
ERR_FAIL_COND_MSG(p_max_size > 256 * 1024 * 1024, "Max encode buffer cannot exceed 256 MiB");
encode_buffer_max_size = next_power_of_2(p_max_size);
encode_buffer.resize(0);
}
int PacketPeer::get_encode_buffer_max_size() const {
return encode_buffer_max_size;
}
Error PacketPeer::get_packet_buffer(Vector<uint8_t> &r_buffer) {
const uint8_t *buffer;
int buffer_size;
Error err = get_packet(&buffer, buffer_size);
if (err) {
return err;
}
r_buffer.resize(buffer_size);
if (buffer_size == 0) {
return OK;
}
uint8_t *w = r_buffer.ptrw();
for (int i = 0; i < buffer_size; i++) {
w[i] = buffer[i];
}
return OK;
}
Error PacketPeer::put_packet_buffer(const Vector<uint8_t> &p_buffer) {
int len = p_buffer.size();
if (len == 0) {
return OK;
}
const uint8_t *r = p_buffer.ptr();
return put_packet(&r[0], len);
}
Error PacketPeer::get_var(Variant &r_variant, bool p_allow_objects) {
const uint8_t *buffer;
int buffer_size;
Error err = get_packet(&buffer, buffer_size);
if (err) {
return err;
}
return decode_variant(r_variant, buffer, buffer_size, nullptr, p_allow_objects);
}
Error PacketPeer::put_var(const Variant &p_packet, bool p_full_objects) {
int len;
Error err = encode_variant(p_packet, nullptr, len, p_full_objects); // compute len first
if (err) {
return err;
}
if (len == 0) {
return OK;
}
ERR_FAIL_COND_V_MSG(len > encode_buffer_max_size, ERR_OUT_OF_MEMORY, "Failed to encode variant, encode size is bigger then encode_buffer_max_size. Consider raising it via 'set_encode_buffer_max_size'.");
if (unlikely(encode_buffer.size() < len)) {
encode_buffer.resize(0); // Avoid realloc
encode_buffer.resize(next_power_of_2(len));
}
uint8_t *w = encode_buffer.ptrw();
err = encode_variant(p_packet, w, len, p_full_objects);
ERR_FAIL_COND_V_MSG(err != OK, err, "Error when trying to encode Variant.");
return put_packet(w, len);
}
Variant PacketPeer::_bnd_get_var(bool p_allow_objects) {
Variant var;
Error err = get_var(var, p_allow_objects);
ERR_FAIL_COND_V(err != OK, Variant());
return var;
}
Error PacketPeer::_put_packet(const Vector<uint8_t> &p_buffer) {
return put_packet_buffer(p_buffer);
}
Vector<uint8_t> PacketPeer::_get_packet() {
Vector<uint8_t> raw;
last_get_error = get_packet_buffer(raw);
return raw;
}
Error PacketPeer::_get_packet_error() const {
return last_get_error;
}
void PacketPeer::_bind_methods() {
ClassDB::bind_method(D_METHOD("get_var", "allow_objects"), &PacketPeer::_bnd_get_var, DEFVAL(false));
ClassDB::bind_method(D_METHOD("put_var", "var", "full_objects"), &PacketPeer::put_var, DEFVAL(false));
ClassDB::bind_method(D_METHOD("get_packet"), &PacketPeer::_get_packet);
ClassDB::bind_method(D_METHOD("put_packet", "buffer"), &PacketPeer::_put_packet);
ClassDB::bind_method(D_METHOD("get_packet_error"), &PacketPeer::_get_packet_error);
ClassDB::bind_method(D_METHOD("get_available_packet_count"), &PacketPeer::get_available_packet_count);
ClassDB::bind_method(D_METHOD("get_encode_buffer_max_size"), &PacketPeer::get_encode_buffer_max_size);
ClassDB::bind_method(D_METHOD("set_encode_buffer_max_size", "max_size"), &PacketPeer::set_encode_buffer_max_size);
ADD_PROPERTY(PropertyInfo(Variant::INT, "encode_buffer_max_size"), "set_encode_buffer_max_size", "get_encode_buffer_max_size");
}
/***************/
void PacketPeerStream::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_stream_peer", "peer"), &PacketPeerStream::set_stream_peer);
ClassDB::bind_method(D_METHOD("get_stream_peer"), &PacketPeerStream::get_stream_peer);
ClassDB::bind_method(D_METHOD("set_input_buffer_max_size", "max_size_bytes"), &PacketPeerStream::set_input_buffer_max_size);
ClassDB::bind_method(D_METHOD("set_output_buffer_max_size", "max_size_bytes"), &PacketPeerStream::set_output_buffer_max_size);
ClassDB::bind_method(D_METHOD("get_input_buffer_max_size"), &PacketPeerStream::get_input_buffer_max_size);
ClassDB::bind_method(D_METHOD("get_output_buffer_max_size"), &PacketPeerStream::get_output_buffer_max_size);
ADD_PROPERTY(PropertyInfo(Variant::INT, "input_buffer_max_size"), "set_input_buffer_max_size", "get_input_buffer_max_size");
ADD_PROPERTY(PropertyInfo(Variant::INT, "output_buffer_max_size"), "set_output_buffer_max_size", "get_output_buffer_max_size");
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "stream_peer", PROPERTY_HINT_RESOURCE_TYPE, "StreamPeer", PROPERTY_USAGE_NONE), "set_stream_peer", "get_stream_peer");
}
Error PacketPeerStream::_poll_buffer() const {
ERR_FAIL_COND_V(peer.is_null(), ERR_UNCONFIGURED);
int read = 0;
ERR_FAIL_COND_V(input_buffer.size() < ring_buffer.space_left(), ERR_UNAVAILABLE);
Error err = peer->get_partial_data(input_buffer.ptrw(), ring_buffer.space_left(), read);
if (err) {
return err;
}
if (read == 0) {
return OK;
}
int w = ring_buffer.write(&input_buffer[0], read);
ERR_FAIL_COND_V(w != read, ERR_BUG);
return OK;
}
int PacketPeerStream::get_available_packet_count() const {
_poll_buffer();
uint32_t remaining = ring_buffer.data_left();
int ofs = 0;
int count = 0;
while (remaining >= 4) {
uint8_t lbuf[4];
ring_buffer.copy(lbuf, ofs, 4);
uint32_t len = decode_uint32(lbuf);
remaining -= 4;
ofs += 4;
if (len > remaining) {
break;
}
remaining -= len;
ofs += len;
count++;
}
return count;
}
Error PacketPeerStream::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
ERR_FAIL_COND_V(peer.is_null(), ERR_UNCONFIGURED);
_poll_buffer();
int remaining = ring_buffer.data_left();
ERR_FAIL_COND_V(remaining < 4, ERR_UNAVAILABLE);
uint8_t lbuf[4];
ring_buffer.copy(lbuf, 0, 4);
remaining -= 4;
uint32_t len = decode_uint32(lbuf);
ERR_FAIL_COND_V(remaining < (int)len, ERR_UNAVAILABLE);
ERR_FAIL_COND_V(input_buffer.size() < (int)len, ERR_UNAVAILABLE);
ring_buffer.read(lbuf, 4); //get rid of first 4 bytes
ring_buffer.read(input_buffer.ptrw(), len); // read packet
*r_buffer = &input_buffer[0];
r_buffer_size = len;
return OK;
}
Error PacketPeerStream::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(peer.is_null(), ERR_UNCONFIGURED);
Error err = _poll_buffer(); //won't hurt to poll here too
if (err) {
return err;
}
if (p_buffer_size == 0) {
return OK;
}
ERR_FAIL_COND_V(p_buffer_size < 0, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(p_buffer_size + 4 > output_buffer.size(), ERR_INVALID_PARAMETER);
encode_uint32(p_buffer_size, output_buffer.ptrw());
uint8_t *dst = &output_buffer.write[4];
for (int i = 0; i < p_buffer_size; i++) {
dst[i] = p_buffer[i];
}
return peer->put_data(&output_buffer[0], p_buffer_size + 4);
}
int PacketPeerStream::get_max_packet_size() const {
return output_buffer.size();
}
void PacketPeerStream::set_stream_peer(const Ref<StreamPeer> &p_peer) {
if (p_peer.ptr() != peer.ptr()) {
ring_buffer.advance_read(ring_buffer.data_left()); // Reset the ring buffer.
}
peer = p_peer;
}
Ref<StreamPeer> PacketPeerStream::get_stream_peer() const {
return peer;
}
void PacketPeerStream::set_input_buffer_max_size(int p_max_size) {
ERR_FAIL_COND_MSG(p_max_size < 0, "Max size of input buffer size cannot be smaller than 0.");
//warning may lose packets
ERR_FAIL_COND_MSG(ring_buffer.data_left(), "Buffer in use, resizing would cause loss of data.");
ring_buffer.resize(nearest_shift(next_power_of_2(p_max_size + 4)) - 1);
input_buffer.resize(next_power_of_2(p_max_size + 4));
}
int PacketPeerStream::get_input_buffer_max_size() const {
return input_buffer.size() - 4;
}
void PacketPeerStream::set_output_buffer_max_size(int p_max_size) {
output_buffer.resize(next_power_of_2(p_max_size + 4));
}
int PacketPeerStream::get_output_buffer_max_size() const {
return output_buffer.size() - 4;
}
PacketPeerStream::PacketPeerStream() {
int rbsize = GLOBAL_GET("network/limits/packet_peer_stream/max_buffer_po2");
ring_buffer.resize(rbsize);
input_buffer.resize(1 << rbsize);
output_buffer.resize(1 << rbsize);
}