external/vulkancts/vkscserver/vksNetwork.cpp

/*-------------------------------------------------------------------------
 * Vulkan CTS Framework
 * --------------------
 *
 * Copyright (c) 2021 The Khronos Group Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *-------------------------------------------------------------------------*/

#include "vksNetwork.hpp"
#include "vksSerializer.hpp"

#include <sstream>

#include "deSocket.hpp"

namespace vksc_server
{

void StringToAddress(const string &str, string &host, int &port)
{
    auto pos = str.find_last_of(':');
    if (pos == string::npos)
    {
        host = str.c_str();
        port = DefaultPort;
    }
    else
    {
        host = str.substr(0, pos);
        std::stringstream{str.substr(pos + 1)} >> port;
    }
}

bool ProccessNetworkData(vector<u8> &buffer, const std::function<void(u32, vector<u8>)> &packetInterpreter)
{
    constexpr msize headerSize = 8;

    if (buffer.size() >= headerSize)
    {
        u32 classHash;
        u32 packetSize;

        Serializer<ToRead>{buffer}.Serialize(classHash, packetSize);

        if (buffer.size() >= packetSize + headerSize)
        {
            auto itbeging = buffer.begin() + headerSize;
            auto itend    = itbeging + packetSize;
            packetInterpreter(classHash, vector<u8>(itbeging, itend));
            buffer.erase(buffer.begin(), itend);
            return buffer.size() >= headerSize; // Try again?
        }
    }

    return false;
}

void Send(de::Socket *socket, const vector<u8> &buffer)
{
    msize sent_total{};
    do
    {
        msize sent{};
        auto result = socket->send(buffer.data() + sent_total, buffer.size() - sent_total, &sent);
        if (result != DE_SOCKETRESULT_SUCCESS)
            throw std::runtime_error("Can't send data to socket");
        sent_total += sent;
    } while (sent_total < buffer.size());
}

void RecvSome(de::Socket *socket, vector<u8> &recvb)
{
    msize received;
    u8 data[8 * 1024];
    auto result = socket->receive(data, sizeof(data), &received);
    if (result != DE_SOCKETRESULT_SUCCESS)
        throw std::runtime_error("Can't receive data from socket");
    recvb.insert(recvb.end(), data, data + received);
}

void SendPayloadWithHeader(de::Socket *socket, u32 type, const std::vector<u8> &payload)
{
    u32 size = static_cast<u32>(payload.size());

    vector<u8> header;
    Serializer<ToWrite> header_serializer(header);
    header_serializer.Serialize(type, size);

    Send(socket, header);
    Send(socket, payload);
}

vector<u8> RecvPacket(de::Socket *socket, vector<u8> &recvb, u32 type)
{
    bool result = false;
    vector<u8> packet;

    while (socket->isConnected() && !result)
    {
        RecvSome(socket, recvb);

        auto interpret = [&](u32 classHash, vector<u8> bufferData)
        {
            if (classHash != type)
                throw std::runtime_error("Unexpected packet type received");
            packet = std::move(bufferData);
            result = true;
        };

        ProccessNetworkData(recvb, interpret);
    }

    if (!result)
        throw std::runtime_error("connection lost before we could get data");

    return packet;
}

}; // namespace vksc_server