2017-07-07 12:34:15 -07:00
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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2017-07-08 06:24:47 -07:00
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#include <atomic>
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#include <mutex>
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#include <thread>
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2017-07-07 12:34:15 -07:00
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#include "common/assert.h"
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#include "enet/enet.h"
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2017-07-08 09:31:35 -07:00
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#include "network/packet.h"
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2017-07-07 12:34:15 -07:00
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#include "network/room_member.h"
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namespace Network {
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constexpr u32 ConnectionTimeoutMs = 5000;
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class RoomMember::RoomMemberImpl {
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public:
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ENetHost* client = nullptr; ///< ENet network interface.
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ENetPeer* server = nullptr; ///< The server peer the client is connected to
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/// Information about the clients connected to the same room as us.
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MemberList member_information;
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/// Information about the room we're connected to.
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RoomInformation room_information;
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std::atomic<State> state{State::Idle}; ///< Current state of the RoomMember.
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void SetState(const State new_state);
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bool IsConnected() const;
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std::string nickname; ///< The nickname of this member.
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MacAddress mac_address; ///< The mac_address of this member.
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std::mutex network_mutex; ///< Mutex that controls access to the `client` variable.
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/// Thread that receives and dispatches network packets
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std::unique_ptr<std::thread> receive_thread;
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void ReceiveLoop();
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void StartLoop();
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/**
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* Sends data to the room. It will be send on channel 0 with flag RELIABLE
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* @param packet The data to send
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*/
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void Send(Packet& packet);
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/**
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* Sends a request to the server, asking for permission to join a room with the specified
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* nickname and preferred mac.
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* @params nickname The desired nickname.
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* @params preferred_mac The preferred MAC address to use in the room, the NoPreferredMac tells
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* the server to assign one for us.
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*/
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void SendJoinRequest(const std::string& nickname,
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const MacAddress& preferred_mac = NoPreferredMac);
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/**
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* Extracts a MAC Address from a received ENet packet.
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* @param event The ENet event that was received.
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*/
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void HandleJoinPacket(const ENetEvent* event);
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/**
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* Extracts RoomInformation and MemberInformation from a received RakNet packet.
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* @param event The ENet event that was received.
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*/
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void HandleRoomInformationPacket(const ENetEvent* event);
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/**
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* Extracts a WifiPacket from a received ENet packet.
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* @param event The ENet event that was received.
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*/
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void HandleWifiPackets(const ENetEvent* event);
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};
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2017-07-08 06:24:47 -07:00
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// RoomMemberImpl
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void RoomMember::RoomMemberImpl::SetState(const State new_state) {
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state = new_state;
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// TODO(B3N30): Invoke the callback functions
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}
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bool RoomMember::RoomMemberImpl::IsConnected() const {
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return state == State::Joining || state == State::Joined;
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}
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void RoomMember::RoomMemberImpl::ReceiveLoop() {
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// Receive packets while the connection is open
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while (IsConnected()) {
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std::lock_guard<std::mutex> lock(network_mutex);
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ENetEvent event;
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if (enet_host_service(client, &event, 1000) > 0) {
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if (event.type == ENET_EVENT_TYPE_RECEIVE) {
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switch (event.packet->data[0]) {
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// TODO(B3N30): Handle the other message types
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case IdRoomInformation:
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HandleRoomInformationPacket(&event);
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break;
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case IdJoinSuccess:
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// The join request was successful, we are now in the room.
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// If we joined successfully, there must be at least one client in the room: us.
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ASSERT_MSG(member_information.size() > 0,
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"We have not yet received member information.");
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HandleJoinPacket(&event); // Get the MAC Address for the client
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SetState(State::Joined);
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break;
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case IdNameCollision:
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SetState(State::NameCollision);
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enet_packet_destroy(event.packet);
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enet_peer_disconnect(server, 0);
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enet_peer_reset(server);
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return;
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break;
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case IdMacCollision:
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SetState(State::MacCollision);
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enet_packet_destroy(event.packet);
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enet_peer_disconnect(server, 0);
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enet_peer_reset(server);
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return;
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break;
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default:
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break;
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}
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enet_packet_destroy(event.packet);
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}
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}
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}
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};
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void RoomMember::RoomMemberImpl::StartLoop() {
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receive_thread = std::make_unique<std::thread>(&RoomMember::RoomMemberImpl::ReceiveLoop, this);
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}
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void RoomMember::RoomMemberImpl::Send(Packet& packet) {
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ENetPacket* enetPacket =
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enet_packet_create(packet.GetData(), packet.GetDataSize(), ENET_PACKET_FLAG_RELIABLE);
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enet_peer_send(server, 0, enetPacket);
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enet_host_flush(client);
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}
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void RoomMember::RoomMemberImpl::SendJoinRequest(const std::string& nickname,
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const MacAddress& preferred_mac) {
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Packet packet;
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packet << static_cast<MessageID>(IdJoinRequest);
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packet << nickname;
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packet << preferred_mac;
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Send(packet);
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}
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void RoomMember::RoomMemberImpl::HandleRoomInformationPacket(const ENetEvent* event) {
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Packet packet;
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packet.Append(event->packet->data, event->packet->dataLength);
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// Ignore the first byte, which is the message id.
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packet.IgnoreBytes(sizeof(MessageID));
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RoomInformation info{};
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packet >> info.name;
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packet >> info.member_slots;
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room_information.name = info.name;
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room_information.member_slots = info.member_slots;
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uint32_t num_members;
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packet >> num_members;
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member_information.resize(num_members);
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for (auto& member : member_information) {
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packet >> member.nickname;
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packet >> member.mac_address;
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packet >> member.game_name;
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}
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// TODO(B3N30): Invoke callbacks
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}
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void RoomMember::RoomMemberImpl::HandleJoinPacket(const ENetEvent* event) {
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Packet packet;
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packet.Append(event->packet->data, event->packet->dataLength);
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// Ignore the first byte, which is the message id.
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packet.IgnoreBytes(sizeof(MessageID));
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// Parse the MAC Address from the BitStream
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packet >> mac_address;
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// TODO(B3N30): Invoke callbacks
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}
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2017-07-09 01:40:11 -07:00
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void RoomMember::RoomMemberImpl::HandleWifiPackets(const ENetEvent* event) {
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WifiPacket wifi_packet{};
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Packet packet;
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packet.Append(event->packet->data, event->packet->dataLength);
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// Ignore the first byte, which is the message id.
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packet.IgnoreBytes(sizeof(MessageID));
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// Parse the WifiPacket from the BitStream
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uint8_t frame_type;
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packet >> frame_type;
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WifiPacket::PacketType type = static_cast<WifiPacket::PacketType>(frame_type);
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wifi_packet.type = type;
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packet >> wifi_packet.channel;
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packet >> wifi_packet.transmitter_address;
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packet >> wifi_packet.destination_address;
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uint32_t data_length;
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packet >> data_length;
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std::vector<uint8_t> data(data_length);
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packet >> data;
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wifi_packet.data = std::move(data);
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// TODO(B3N30): Invoke callbacks
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}
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// RoomMember
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RoomMember::RoomMember() : room_member_impl{std::make_unique<RoomMemberImpl>()} {
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room_member_impl->client = enet_host_create(nullptr, 1, NumChannels, 0, 0);
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ASSERT_MSG(room_member_impl->client != nullptr, "Could not create client");
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}
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RoomMember::~RoomMember() {
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ASSERT_MSG(!IsConnected(), "RoomMember is being destroyed while connected");
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enet_host_destroy(room_member_impl->client);
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}
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RoomMember::State RoomMember::GetState() const {
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return room_member_impl->state;
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}
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const RoomMember::MemberList& RoomMember::GetMemberInformation() const {
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return room_member_impl->member_information;
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}
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RoomInformation RoomMember::GetRoomInformation() const {
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return room_member_impl->room_information;
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}
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void RoomMember::Join(const std::string& nick, const char* server_addr, u16 server_port,
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u16 client_port) {
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ENetAddress address{};
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enet_address_set_host(&address, server_addr);
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address.port = server_port;
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room_member_impl->server =
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enet_host_connect(room_member_impl->client, &address, NumChannels, 0);
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if (!room_member_impl->server) {
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room_member_impl->SetState(State::Error);
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return;
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}
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ENetEvent event{};
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int net = enet_host_service(room_member_impl->client, &event, ConnectionTimeoutMs);
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if (net > 0 && event.type == ENET_EVENT_TYPE_CONNECT) {
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room_member_impl->nickname = nick;
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room_member_impl->SetState(State::Joining);
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room_member_impl->StartLoop();
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room_member_impl->SendJoinRequest(nick);
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} else {
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room_member_impl->SetState(State::CouldNotConnect);
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}
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}
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bool RoomMember::IsConnected() const {
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return room_member_impl->IsConnected();
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}
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void RoomMember::SendWifiPacket(const WifiPacket& wifi_packet) {
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Packet packet;
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packet << static_cast<MessageID>(IdWifiPacket);
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packet << static_cast<uint8_t>(wifi_packet.type);
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packet << wifi_packet.channel;
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packet << wifi_packet.transmitter_address;
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packet << wifi_packet.destination_address;
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packet << static_cast<uint32_t>(wifi_packet.data.size());
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packet << wifi_packet.data;
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room_member_impl->Send(packet);
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}
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void RoomMember::Leave() {
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ASSERT_MSG(room_member_impl->receive_thread != nullptr, "Must be in a room to leave it.");
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{
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std::lock_guard<std::mutex> lock(room_member_impl->network_mutex);
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enet_peer_disconnect(room_member_impl->server, 0);
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room_member_impl->SetState(State::Idle);
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}
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room_member_impl->receive_thread->join();
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room_member_impl->receive_thread.reset();
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enet_peer_reset(room_member_impl->server);
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}
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} // namespace Network
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