Network: Enable sending and receiving chat messages

src/network/room.cpp

@@ -106,6 +106,12 @@ public:
      */
     void HandleWifiPacket(const ENetEvent* event);
 
+    /**
+     * Extracts a chat entry from a received ENet packet and adds it to the chat queue.
+     * @param event The ENet event that was received.
+     */
+    void HandleChatPacket(const ENetEvent* event);
+
     /**
      * Removes the client from the members list if it was in it and announces the change
      * to all other clients.
@@ -128,6 +134,9 @@ void Room::RoomImpl::ServerLoop() {
                 case IdWifiPacket:
                     HandleWifiPacket(&event);
                     break;
+                case IdChatMessage:
+                    HandleChatPacket(&event);
+                    break;
                 }
                 enet_packet_destroy(event.packet);
                 break;
@@ -271,6 +280,35 @@ void Room::RoomImpl::HandleWifiPacket(const ENetEvent* event) {
     enet_host_flush(server);
 }
 
+void Room::RoomImpl::HandleChatPacket(const ENetEvent* event) {
+    Packet in_packet;
+    in_packet.Append(event->packet->data, event->packet->dataLength);
+
+    in_packet.IgnoreBytes(sizeof(MessageID));
+    std::string message;
+    in_packet >> message;
+    auto CompareNetworkAddress = [&](const Member member) -> bool {
+        return member.peer == event->peer;
+    };
+    const auto sending_member = std::find_if(members.begin(), members.end(), CompareNetworkAddress);
+    if (sending_member == members.end()) {
+        return; // Received a chat message from a unknown sender
+    }
+
+    Packet out_packet;
+    out_packet << static_cast<MessageID>(IdChatMessage);
+    out_packet << sending_member->nickname;
+    out_packet << message;
+
+    ENetPacket* enet_packet = enet_packet_create(out_packet.GetData(), out_packet.GetDataSize(),
+                                                 ENET_PACKET_FLAG_RELIABLE);
+    for (auto it = members.begin(); it != members.end(); ++it) {
+        if (it->peer != event->peer)
+            enet_peer_send(it->peer, 0, enet_packet);
+    }
+    enet_host_flush(server);
+}
+
 void Room::RoomImpl::HandleClientDisconnection(ENetPeer* client) {
     // Remove the client from the members list.
     members.erase(std::remove_if(members.begin(), members.end(),

src/network/room_member.cpp

@@ -68,6 +68,12 @@ public:
      * @param event The  ENet event that was received.
      */
     void HandleWifiPackets(const ENetEvent* event);
+
+    /**
+     * Extracts a chat entry from a received ENet packet and adds it to the chat queue.
+     * @param event The ENet event that was received.
+     */
+    void HandleChatPacket(const ENetEvent* event);
 };
 
 // RoomMemberImpl
@@ -89,6 +95,9 @@ void RoomMember::RoomMemberImpl::ReceiveLoop() {
             if (event.type == ENET_EVENT_TYPE_RECEIVE) {
                 switch (event.packet->data[0]) {
                 // TODO(B3N30): Handle the other message types
+                case IdChatMessage:
+                    HandleChatPacket(&event);
+                    break;
                 case IdRoomInformation:
                     HandleRoomInformationPacket(&event);
                     break;
@@ -208,6 +217,19 @@ void RoomMember::RoomMemberImpl::HandleWifiPackets(const ENetEvent* event) {
     // TODO(B3N30): Invoke callbacks
 }
 
+void RoomMember::RoomMemberImpl::HandleChatPacket(const ENetEvent* event) {
+    Packet packet;
+    packet.Append(event->packet->data, event->packet->dataLength);
+
+    // Ignore the first byte, which is the message id.
+    packet.IgnoreBytes(sizeof(MessageID));
+
+    ChatEntry chat_entry{};
+    packet >> chat_entry.nickname;
+    packet >> chat_entry.message;
+    // TODO(B3N30): Invoke callbacks
+}
+
 // RoomMember
 RoomMember::RoomMember() : room_member_impl{std::make_unique<RoomMemberImpl>()} {
     room_member_impl->client = enet_host_create(nullptr, 1, NumChannels, 0, 0);
@@ -273,6 +295,13 @@ void RoomMember::SendWifiPacket(const WifiPacket& wifi_packet) {
     room_member_impl->Send(packet);
 }
 
+void RoomMember::SendChatMessage(const std::string& message) {
+    Packet packet;
+    packet << static_cast<MessageID>(IdChatMessage);
+    packet << message;
+    room_member_impl->Send(packet);
+}
+
 void RoomMember::Leave() {
     ASSERT_MSG(room_member_impl->receive_thread != nullptr, "Must be in a room to leave it.");
     {

src/network/room_member.h

@@ -24,6 +24,12 @@ struct WifiPacket {
     uint8_t channel;                ///< WiFi channel where this frame was transmitted.
 };
 
+/// Represents a chat message.
+struct ChatEntry {
+    std::string nickname; ///< Nickname of the client who sent this message.
+    std::string message;  ///< Body of the message.
+};
+
 /**
  * This is what a client [person joining a server] would use.
  * It also has to be used if you host a game yourself (You'd create both, a Room and a
@@ -87,6 +93,12 @@ public:
      */
     void SendWifiPacket(const WifiPacket& packet);
 
+    /**
+     * Sends a chat message to the room.
+     * @param message The contents of the message.
+     */
+    void SendChatMessage(const std::string& message);
+
     /**
      * Leaves the current room.
      */