110 lines
2.9 KiB
C++
110 lines
2.9 KiB
C++
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#include "sockets.h"
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#include <array>
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#include <memory>
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#include <mutex>
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constexpr auto max_buffer = 1024;
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decltype(net::message_queue) net::message_queue{};
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auto net::recv(const SOCKET socket) noexcept -> std::string
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{
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static std::recursive_mutex mutex{}; //allows for multiple thread access to our recv.
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std::unique_lock<std::recursive_mutex> lock(mutex);
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try
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{
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auto& my_queue = message_queue[socket];
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if (!my_queue.empty())
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{
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std::string message = my_queue.front(); // ReSharper disable All Just shut up resharper. I would use auto here normally, but the linter wants to make message a reference.....even though it won't be valid next line.
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my_queue.pop();
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lock.unlock();
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return message;
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}
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lock.unlock(); //release lock so as to not deadlock on recv.
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std::string data;
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auto length = max_buffer;
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while (length == max_buffer) /* queue all future messages from the stream */
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{
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char message_buffer[max_buffer] = { 0 };
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length = ::recv(socket, message_buffer, max_buffer, 0);
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if (length < 0)
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throw std::runtime_error("Closed Socket");
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for (auto i = 0; i < length; ++i)
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if (message_buffer[i]) /*append until null. [free message framing ;)]*/
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{
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data += message_buffer[i];
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}
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else
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{
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lock.lock();
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my_queue.push(data);
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data.clear();
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lock.unlock();
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}
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}
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if(!data.empty()) //improperly terminated message, don't drop it!
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{
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lock.lock();
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my_queue.push(data);
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data.clear();
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lock.unlock();
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}
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if (my_queue.empty()) /* empty response */
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{
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return "";
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}
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return recv(socket); //recurse.
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}catch(std::exception& err) /* shouldn't happen. */
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{
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return {}; //empty
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}
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}
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auto net::system(const std::string& command) noexcept -> std::string
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{
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try
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{
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std::array<char, max_buffer> output{ 0 }; //size is arbitrary
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std::string data{};
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const popen_up pipe(popen(command.c_str(), "r"));
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if (!pipe)
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return "";
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while (fgets(output.data(), output.size(), pipe.get()) != nullptr)
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data += output.data();
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return data;
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}catch(std::exception&)
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{
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return "";
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}
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}
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#if WIN32
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auto net::closesocket(const SOCKET socket) noexcept -> unsigned
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{
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message_queue.erase(socket);
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return ::closesocket(socket);
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}
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auto net::prologue() noexcept -> void
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{
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WSADATA wsa_data;
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const auto result = WSAStartup(win_sock_ver, &wsa_data);
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if (result)
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{
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std::cout << "FATAL ERROR IN PROLOGUE " << result << std::endl;
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exit(-1);
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}
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}
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auto net::epilogue() noexcept -> void { WSACleanup(); }
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#else
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auto net::closesocket(const SOCKET socket) noexcept -> unsigned
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{
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message_queue.erase(socket);
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return close(socket);
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}
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auto net::prologue() noexcept -> void {} //not required on Linux.
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auto net::epilogue() noexcept -> void {} //not required on Linux.
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#endif
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