Real-time chat server. Provides real-time message transmission and channel management features based on gRPC.

• English (Default)
• 한국어

• gRPC Streaming: Real-time bidirectional message transmission
• Channel Management: Public/private channel creation and management
• Message Broadcasting: Send messages to all users in a channel

• Facebook Authentication: Facebook OAuth support
• GameCenter Authentication: Apple GameCenter authentication support
• External Authentication Providers: Extensible authentication system

• Private Messages: 1:1 private messaging
• Group Chat: Multi-user group chat
• System Messages: System notifications sent by server

• ChatService: gRPC chat service
• ChannelManager: Channel management
• UserManager: User management
• MessageQueue: Message queue management

service ChatService {
    rpc JoinChannel(JoinChannelRequest) returns (JoinChannelResponse);
    rpc LeaveChannel(LeaveChannelRequest) returns (LeaveChannelResponse);
    rpc SendMessage(SendMessageRequest) returns (SendMessageResponse);
    rpc GetChannelMessages(GetChannelMessagesRequest) returns (GetChannelMessagesResponse);
    rpc StreamMessages(StreamMessagesRequest) returns (stream ChatMessage);
}

var request = new JoinChannelRequest {
    ChannelId = "general",
    UserId = "user123"
};

var response = await chatClient.JoinChannelAsync(request);

var message = new SendMessageRequest {
    ChannelId = "general",
    UserId = "user123",
    Content = "Hello, World!",
    MessageType = MessageType.Text
};

var response = await chatClient.SendMessageAsync(message);

using var call = chatClient.StreamMessages(new StreamMessagesRequest {
    ChannelId = "general",
    UserId = "user123"
});

await foreach (var message in call.ResponseStream) {
    Console.WriteLine($"{message.UserId}: {message.Content}");
}

Chat/
├── Chat.csproj              # Project file
├── appsettings.json         # Default configuration
├── appsettings.Release.json # Production configuration
├── build.sh                 # Build script
├── GrpcHostedService.cs     # gRPC hosting service
├── Service/
│   └── ChatService.cs       # Chat service implementation
├── OAuth/                   # OAuth authentication
│   ├── ExternalProvider.cs
│   ├── ExternalProviderFacebook.cs
│   └── ExternalProviderGameCenter.cs
├── Credentials/             # Authentication credentials
│   └── README
└── bin/                     # Build output

• .NET 6.0 or higher
• gRPC
• Redis (optional, for caching)

• gRPC communication
• OAuth authentication providers
• Message queue system

• Asynchronous Processing: Asynchronous message transmission processing
• Batch Processing: Simultaneous processing of multiple messages
• Memory Optimization: Efficient message structure

• Horizontal Scaling: Support for multiple server instances
• Load Balancing: gRPC load balancer support
• Cache System: Redis-based message cache

• Lobby/ - Lobby server (user authentication)
• Battle/ - Battle server (in-game chat)
• Cache/ - Cache server