310 lines
11 KiB
C#
310 lines
11 KiB
C#
using Livekit.Server.Sdk.Dotnet;
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using Microsoft.EntityFrameworkCore;
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using NodaTime;
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using System.Text.Json;
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using DysonNetwork.Shared.Cache;
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using DysonNetwork.Shared.Proto;
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namespace DysonNetwork.Sphere.Chat.Realtime;
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/// <summary>
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/// LiveKit implementation of the real-time communication service
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/// </summary>
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public class LiveKitRealtimeService : IRealtimeService
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{
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private readonly AppDatabase _db;
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private readonly ICacheService _cache;
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private readonly ILogger<LiveKitRealtimeService> _logger;
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private readonly RoomServiceClient _roomService;
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private readonly AccessToken _accessToken;
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private readonly WebhookReceiver _webhookReceiver;
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public LiveKitRealtimeService(
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IConfiguration configuration,
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ILogger<LiveKitRealtimeService> logger,
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AppDatabase db,
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ICacheService cache
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)
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{
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_logger = logger;
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// Get LiveKit configuration from appsettings
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var host = configuration["RealtimeChat:Endpoint"] ??
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throw new ArgumentNullException("Endpoint configuration is required");
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var apiKey = configuration["RealtimeChat:ApiKey"] ??
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throw new ArgumentNullException("ApiKey configuration is required");
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var apiSecret = configuration["RealtimeChat:ApiSecret"] ??
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throw new ArgumentNullException("ApiSecret configuration is required");
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_roomService = new RoomServiceClient(host, apiKey, apiSecret);
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_accessToken = new AccessToken(apiKey, apiSecret);
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_webhookReceiver = new WebhookReceiver(apiKey, apiSecret);
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_db = db;
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_cache = cache;
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}
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/// <inheritdoc />
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public string ProviderName => "LiveKit";
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/// <inheritdoc />
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public async Task<RealtimeSessionConfig> CreateSessionAsync(Guid roomId, Dictionary<string, object> metadata)
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{
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try
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{
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var roomName = $"Call_{roomId.ToString().Replace("-", "")}";
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// Convert metadata to a string dictionary for LiveKit
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var roomMetadata = new Dictionary<string, string>();
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foreach (var item in metadata)
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{
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roomMetadata[item.Key] = item.Value?.ToString() ?? string.Empty;
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}
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// Create room in LiveKit
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var room = await _roomService.CreateRoom(new CreateRoomRequest
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{
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Name = roomName,
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EmptyTimeout = 300, // 5 minutes
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Metadata = JsonSerializer.Serialize(roomMetadata)
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});
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// Return session config
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return new RealtimeSessionConfig
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{
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SessionId = room.Name,
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Parameters = new Dictionary<string, object>
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{
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{ "sid", room.Sid },
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{ "emptyTimeout", room.EmptyTimeout },
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{ "creationTime", room.CreationTime }
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}
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};
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Failed to create LiveKit room for roomId: {RoomId}", roomId);
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throw;
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}
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}
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/// <inheritdoc />
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public async Task EndSessionAsync(string sessionId, RealtimeSessionConfig config)
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{
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try
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{
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// Delete the room in LiveKit
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await _roomService.DeleteRoom(new DeleteRoomRequest
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{
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Room = sessionId
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});
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Failed to end LiveKit session: {SessionId}", sessionId);
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throw;
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}
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}
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/// <inheritdoc />
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public string GetUserToken(Account account, string sessionId, bool isAdmin = false)
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{
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var token = _accessToken.WithIdentity(account.Name)
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.WithName(account.Nick)
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.WithGrants(new VideoGrants
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{
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RoomJoin = true,
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CanPublish = true,
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CanPublishData = true,
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CanSubscribe = true,
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CanSubscribeMetrics = true,
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RoomAdmin = isAdmin,
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Room = sessionId
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})
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.WithMetadata(JsonSerializer.Serialize(new Dictionary<string, string>
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{ { "account_id", account.Id.ToString() } }))
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.WithTtl(TimeSpan.FromHours(1));
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return token.ToJwt();
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}
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public async Task ReceiveWebhook(string body, string authHeader)
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{
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var evt = _webhookReceiver.Receive(body, authHeader);
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if (evt is null) return;
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switch (evt.Event)
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{
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case "room_finished":
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var now = SystemClock.Instance.GetCurrentInstant();
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await _db.ChatRealtimeCall
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.Where(c => c.SessionId == evt.Room.Name)
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.ExecuteUpdateAsync(s => s.SetProperty(p => p.EndedAt, now)
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);
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// Also clean up participants list when the room is finished
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await _cache.RemoveAsync(_GetParticipantsKey(evt.Room.Name));
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break;
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case "participant_joined":
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if (evt.Participant != null)
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{
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// Add the participant to cache
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await _AddParticipantToCache(evt.Room.Name, evt.Participant);
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_logger.LogInformation(
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"Participant joined room: {RoomName}, Participant: {ParticipantIdentity}",
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evt.Room.Name, evt.Participant.Identity);
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// Broadcast participant list update to all participants
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// await _BroadcastParticipantUpdate(evt.Room.Name);
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}
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break;
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case "participant_left":
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if (evt.Participant != null)
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{
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// Remove the participant from cache
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await _RemoveParticipantFromCache(evt.Room.Name, evt.Participant);
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_logger.LogInformation(
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"Participant left room: {RoomName}, Participant: {ParticipantIdentity}",
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evt.Room.Name, evt.Participant.Identity);
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// Broadcast participant list update to all participants
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// await _BroadcastParticipantUpdate(evt.Room.Name);
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}
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break;
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}
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}
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private static string _GetParticipantsKey(string roomName)
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=> $"RoomParticipants_{roomName}";
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private async Task _AddParticipantToCache(string roomName, ParticipantInfo participant)
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{
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var participantsKey = _GetParticipantsKey(roomName);
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// Try to acquire a lock to prevent race conditions when updating the participants list
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await using var lockObj = await _cache.AcquireLockAsync(
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$"{participantsKey}_lock",
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TimeSpan.FromSeconds(10),
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TimeSpan.FromSeconds(5));
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if (lockObj == null)
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{
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_logger.LogWarning("Failed to acquire lock for updating participants list in room: {RoomName}", roomName);
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return;
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}
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// Get the current participants list
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var participants = await _cache.GetAsync<List<ParticipantCacheItem>>(participantsKey) ??
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[];
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// Check if the participant already exists
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var existingIndex = participants.FindIndex(p => p.Identity == participant.Identity);
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if (existingIndex >= 0)
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{
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// Update existing participant
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participants[existingIndex] = CreateParticipantCacheItem(participant);
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}
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else
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{
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// Add new participant
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participants.Add(CreateParticipantCacheItem(participant));
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}
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// Update cache with new list
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await _cache.SetAsync(participantsKey, participants, TimeSpan.FromHours(6));
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// Also add to a room group in cache for easy cleanup
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await _cache.AddToGroupAsync(participantsKey, $"Room_{roomName}");
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}
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private async Task _RemoveParticipantFromCache(string roomName, ParticipantInfo participant)
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{
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var participantsKey = _GetParticipantsKey(roomName);
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// Try to acquire a lock to prevent race conditions when updating the participants list
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await using var lockObj = await _cache.AcquireLockAsync(
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$"{participantsKey}_lock",
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TimeSpan.FromSeconds(10),
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TimeSpan.FromSeconds(5));
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if (lockObj == null)
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{
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_logger.LogWarning("Failed to acquire lock for updating participants list in room: {RoomName}", roomName);
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return;
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}
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// Get current participants list
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var participants = await _cache.GetAsync<List<ParticipantCacheItem>>(participantsKey);
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if (participants == null || !participants.Any())
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return;
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// Remove participant
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participants.RemoveAll(p => p.Identity == participant.Identity);
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// Update cache with new list
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await _cache.SetAsync(participantsKey, participants, TimeSpan.FromHours(6));
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}
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// Helper method to get participants in a room
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public async Task<List<ParticipantCacheItem>> GetRoomParticipantsAsync(string roomName)
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{
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var participantsKey = _GetParticipantsKey(roomName);
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return await _cache.GetAsync<List<ParticipantCacheItem>>(participantsKey) ?? [];
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}
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// Class to represent a participant in the cache
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public class ParticipantCacheItem
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{
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public string Identity { get; set; } = null!;
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public string Name { get; set; } = null!;
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public Guid? AccountId { get; set; }
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public ParticipantInfo.Types.State State { get; set; }
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public Dictionary<string, string> Metadata { get; set; } = new();
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public DateTime JoinedAt { get; set; }
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}
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private ParticipantCacheItem CreateParticipantCacheItem(ParticipantInfo participant)
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{
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// Try to parse account ID from metadata
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Guid? accountId = null;
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var metadata = new Dictionary<string, string>();
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if (string.IsNullOrEmpty(participant.Metadata))
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return new ParticipantCacheItem
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{
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Identity = participant.Identity,
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Name = participant.Name,
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AccountId = accountId,
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State = participant.State,
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Metadata = metadata,
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JoinedAt = DateTime.UtcNow
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};
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try
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{
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metadata = JsonSerializer.Deserialize<Dictionary<string, string>>(participant.Metadata) ??
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new Dictionary<string, string>();
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if (metadata.TryGetValue("account_id", out var accountIdStr))
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if (Guid.TryParse(accountIdStr, out var parsedId))
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accountId = parsedId;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Failed to parse participant metadata");
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}
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return new ParticipantCacheItem
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{
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Identity = participant.Identity,
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Name = participant.Name,
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AccountId = accountId,
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State = participant.State,
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Metadata = metadata,
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JoinedAt = DateTime.UtcNow
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};
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}
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} |