feat: implement PrefixService for cached prefix lookup and enhance ASN list handling across modules

BGPLite.Api/BgpDbContext.cs

@@ -16,6 +16,9 @@ public class BgpDbContext : DbContext
         if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
             Directory.CreateDirectory(dir);
         Database.EnsureCreated();
+
+        Peers.Where(p => p.Status == "active").ExecuteUpdate(
+            s => s.SetProperty(p => p.Status, "inactive"));
     }
 
     protected override void OnConfiguring(DbContextOptionsBuilder options)

BGPLite.Api/ManagementApi.cs

@@ -3,6 +3,7 @@ using System.Text;
 using System.Text.Json;
 using BGPLite.Api.Entities;
 using BGPLite.Configuration;
+using BGPLite.Providers;
 using BGPLite.Routing;
 using BGPLite.Server;
 using Microsoft.Extensions.Hosting;
@@ -16,6 +17,7 @@ public sealed class ManagementApi : IHostedService, IDisposable
     private readonly RouteTable _routeTable;
     private readonly AppConfig _config;
     private readonly BgpMetrics _metrics;
+    private readonly PrefixService? _prefixService;
     private readonly ILogger<ManagementApi> _logger;
     private HttpListener? _listener;
     private Task? _listenTask;
@@ -26,12 +28,14 @@ public sealed class ManagementApi : IHostedService, IDisposable
         RouteTable routeTable,
         AppConfig config,
         BgpMetrics metrics,
-        ILogger<ManagementApi> logger)
+        ILogger<ManagementApi> logger,
+        PrefixService? prefixService = null)
     {
         _store = store;
         _routeTable = routeTable;
         _config = config;
         _metrics = metrics;
+        _prefixService = prefixService;
         _logger = logger;
     }
 
@@ -89,7 +93,7 @@ public sealed class ManagementApi : IHostedService, IDisposable
                 response = ApiResponse.Ok(new { ip = clientIp });
             }
             else if (method == "GET" && path == "/api/asn-lists")
-                response = HandleGetAsnLists();
+                response = await HandleGetAsnListsAsync();
             else if (method == "GET" && path == "/api/sessions")
                 response = HandleGetSessions();
             else if (method == "POST" && path == "/api/peers")
@@ -117,17 +121,35 @@ public sealed class ManagementApi : IHostedService, IDisposable
         }
     }
 
-    private ApiResponse HandleGetAsnLists()
+    private async Task<ApiResponse> HandleGetAsnListsAsync()
     {
         var lists = _config.RipeStat?.AsnLists ?? [];
-        return ApiResponse.Ok(lists.Select(l => new
+        var result = new List<object>();
+
+        foreach (var l in lists)
         {
-            l.Name,
-            l.Description,
-            l.Country,
-            asns = l.Asns,
-            type = l.Country is not null ? "country" : "asn"
-        }));
+            int prefixCount = 0;
+            if (_prefixService is not null)
+            {
+                foreach (var asn in l.Asns)
+                {
+                    try { prefixCount += await _prefixService.GetPrefixCountAsync(asn); }
+                    catch { }
+                }
+            }
+
+            result.Add(new
+            {
+                id = l.Id,
+                l.Name,
+                l.Description,
+                l.Country,
+                prefixCount,
+                type = l.Country is not null ? "country" : "asn"
+            });
+        }
+
+        return ApiResponse.Ok(result);
     }
 
     private ApiResponse HandleGetSessions()

BGPLite.Configuration/RipeStatConfig.cs

@@ -10,6 +10,8 @@ public sealed class RipeStatConfig
 
 public sealed class AsnList
 {
+    public string Id { get; init; } = Guid.NewGuid().ToString();
+
     [YamlMember(Alias = "Name")]
     public string Name { get; init; } = "";
 

BGPLite.Providers/PrefixService.cs

@@ -0,0 +1,44 @@
+using System.Collections.Concurrent;
+
+namespace BGPLite.Providers;
+
+public sealed class PrefixService
+{
+    private readonly RipeStatProvider _ripeStat;
+    private readonly ConcurrentDictionary<uint, (IReadOnlyList<(uint Prefix, byte Length)> Data, DateTime CachedAt)> _cache = new();
+    private readonly TimeSpan _cacheTtl;
+
+    public PrefixService(RipeStatProvider ripeStat, TimeSpan? cacheTtl = null)
+    {
+        _ripeStat = ripeStat;
+        _cacheTtl = cacheTtl ?? TimeSpan.FromHours(1);
+    }
+
+    public async Task<IReadOnlyList<(uint Prefix, byte Length)>> GetPrefixesAsync(uint asn)
+    {
+        if (_cache.TryGetValue(asn, out var cached) && DateTime.UtcNow - cached.CachedAt < _cacheTtl)
+            return cached.Data;
+
+        var prefixes = await _ripeStat.GetPrefixesAsync(asn);
+        _cache[asn] = (prefixes, DateTime.UtcNow);
+        return prefixes;
+    }
+
+    public async Task<List<(uint Prefix, byte Length, uint Asn)>> GetPrefixesForAsns(IEnumerable<uint> asns)
+    {
+        var result = new List<(uint Prefix, byte Length, uint Asn)>();
+        foreach (var asn in asns)
+        {
+            var prefixes = await GetPrefixesAsync(asn);
+            foreach (var (prefix, length) in prefixes)
+                result.Add((prefix, length, asn));
+        }
+        return result;
+    }
+
+    public async Task<int> GetPrefixCountAsync(uint asn)
+    {
+        var prefixes = await GetPrefixesAsync(asn);
+        return prefixes.Count;
+    }
+}

BGPLite.Server/BgpServer.cs

@@ -21,7 +21,7 @@ public sealed class BgpServer : IHostedService, IDisposable
     private readonly ILogger<BgpServer> _logger;
     private readonly Action<string, uint>? _onPeerIdentified;
     private readonly PeerStore? _peerStore;
-    private readonly RipeStatProvider? _ripeStatProvider;
+    private readonly PrefixService? _prefixService;
     private readonly ConcurrentDictionary<string, BgpSession> _sessions = new();
     private readonly CancellationTokenSource _cts = new();
     private Socket? _listener;
@@ -41,7 +41,7 @@ public sealed class BgpServer : IHostedService, IDisposable
         ILogger<BgpServer> logger,
         Action<string, uint>? onPeerIdentified = null,
         PeerStore? peerStore = null,
-        RipeStatProvider? ripeStatProvider = null)
+        PrefixService? prefixService = null)
     {
         _config = config;
         _routeTable = routeTable;
@@ -51,7 +51,7 @@ public sealed class BgpServer : IHostedService, IDisposable
         _logger = logger;
         _onPeerIdentified = onPeerIdentified;
         _peerStore = peerStore;
-        _ripeStatProvider = ripeStatProvider;
+        _prefixService = prefixService;
     }
 
     public Task StartAsync(CancellationToken cancellationToken)
@@ -119,7 +119,7 @@ public sealed class BgpServer : IHostedService, IDisposable
                     socket, peerConfig, _config.Bgp, _routeTable,
                     _routeFilter, _metrics, _sessionLogger,
                     _onPeerIdentified,
-                    _peerStore, _ripeStatProvider, _config);
+                    _peerStore, _prefixService, _config);
 
                 _sessions[peerAddress] = session;
 

BGPLite.Server/BgpSession.cs

@@ -23,7 +23,7 @@ public sealed class BgpSession : IDisposable
     private readonly CancellationTokenSource _cts = new();
     private readonly Action<string, uint>? _onPeerIdentified;
     private readonly PeerStore? _peerStore;
-    private readonly RipeStatProvider? _ripeStatProvider;
+    private readonly PrefixService? _prefixService;
     private readonly AppConfig? _appConfig;
 
     private BgpFsmState _state = BgpFsmState.Idle;
@@ -47,7 +47,7 @@ public sealed class BgpSession : IDisposable
         ILogger<BgpSession> logger,
         Action<string, uint>? onPeerIdentified = null,
         PeerStore? peerStore = null,
-        RipeStatProvider? ripeStatProvider = null,
+        PrefixService? prefixService = null,
         AppConfig? appConfig = null)
     {
         _socket = socket;
@@ -60,7 +60,7 @@ public sealed class BgpSession : IDisposable
         _logger = logger;
         _onPeerIdentified = onPeerIdentified;
         _peerStore = peerStore;
-        _ripeStatProvider = ripeStatProvider;
+        _prefixService = prefixService;
         _appConfig = appConfig;
     }
 
@@ -270,8 +270,7 @@ public sealed class BgpSession : IDisposable
         var nextHop = BgpConstants.IPAddressToUint(_bgpConfig.GetRouterIdAddress());
         var routes = new List<Route>();
 
-        // Try dynamic route fetching from peer subscriptions
-        if (_peerStore is not null && _ripeStatProvider is not null && _appConfig is not null)
+        if (_peerStore is not null && _prefixService is not null && _appConfig is not null)
         {
             var peer = _peerStore.GetPeerByIp(_peerConfig.Address);
             if (peer is not null)
@@ -279,35 +278,32 @@ public sealed class BgpSession : IDisposable
                 _peerStore.UpdateSessionStatus(_peerConfig.Address, true);
 
                 var subscriptionNames = _peerStore.GetSubscriptions(peer.Id);
-                var asnLists = _appConfig.RipeStat?.AsnLists
+                var asns = _appConfig.RipeStat?.AsnLists
                     .Where(l => subscriptionNames.Contains(l.Name))
+                    .SelectMany(l => l.Asns)
                     .ToList() ?? [];
 
-                // Fetch prefixes for each subscribed AS list
-                foreach (var asnList in asnLists)
+                if (asns.Count > 0)
                 {
-                    foreach (var asn in asnList.Asns)
+                    try
                     {
-                        try
+                        var prefixes = await _prefixService.GetPrefixesForAsns(asns);
+                        foreach (var (prefix, length, asn) in prefixes)
                         {
-                            var prefixes = await _ripeStatProvider.GetPrefixesAsync(asn);
-                            foreach (var (prefix, length) in prefixes)
+                            routes.Add(new Route
                             {
-                                routes.Add(new Route
-                                {
-                                    Prefix = prefix,
-                                    PrefixLength = length,
-                                    NextHop = nextHop,
-                                    AsPath = [asn]
-                                });
-                            }
-                            _logger.LogInformation("Fetched {Count} prefixes for AS{Asn} ({List}) for {Peer}",
-                                prefixes.Count, asn, asnList.Name, _peerConfig.Address);
-                        }
-                        catch (Exception ex)
-                        {
-                            _logger.LogError(ex, "Failed to fetch prefixes for AS{Asn} for {Peer}", asn, _peerConfig.Address);
+                                Prefix = prefix,
+                                PrefixLength = length,
+                                NextHop = nextHop,
+                                AsPath = [asn]
+                            });
                         }
+                        _logger.LogInformation("Fetched {Count} prefixes for {Peer} from subscriptions",
+                            routes.Count, _peerConfig.Address);
+                    }
+                    catch (Exception ex)
+                    {
+                        _logger.LogError(ex, "Failed to fetch prefixes for {Peer}", _peerConfig.Address);
                     }
                 }
 
@@ -327,6 +323,46 @@ public sealed class BgpSession : IDisposable
                     });
                 }
 
+                if (routes.Count > 0)
+                {
+                    await SendRoutesAsync(nextHop, routes);
+                    return;
+                }
+            }
+            else
+            {
+                // Unknown peer — auto-register and send default RU list
+                _logger.LogInformation("Unknown peer {Ip}, auto-registering with RU defaults", _peerConfig.Address);
+
+                _peerStore.CreatePeer(_peerConfig.Address, _remoteAsn, null);
+
+                var ruAsns = _appConfig.RipeStat?.AsnLists
+                    .Where(l => l.Country == "RU")
+                    .SelectMany(l => l.Asns)
+                    .ToList();
+
+                if (ruAsns is { Count: > 0 })
+                {
+                    try
+                    {
+                        var prefixes = await _prefixService.GetPrefixesForAsns(ruAsns);
+                        foreach (var (prefix, length, asn) in prefixes)
+                        {
+                            routes.Add(new Route
+                            {
+                                Prefix = prefix,
+                                PrefixLength = length,
+                                NextHop = nextHop,
+                                AsPath = [asn]
+                            });
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        _logger.LogError(ex, "Failed to fetch RU prefixes for {Peer}", _peerConfig.Address);
+                    }
+                }
+
                 if (routes.Count > 0)
                 {
                     await SendRoutesAsync(nextHop, routes);
@@ -335,7 +371,7 @@ public sealed class BgpSession : IDisposable
             }
         }
 
-        // Fallback: send from shared route table
+        // Final fallback: send from shared route table
         var tableRoutes = _routeTable.GetAll();
         if (tableRoutes.Count == 0) return;
 

BGPLite/Program.cs

@@ -71,13 +71,16 @@ builder.Services.AddSingleton(new BgpMetrics());
 
 // RIPE Stat prefix provider
 if (config.RipeStat is { AsnLists.Count: > 0 })
+{
     builder.Services.AddHttpClient<RipeStatProvider>(c => c.Timeout = TimeSpan.FromSeconds(30));
+    builder.Services.AddSingleton<PrefixService>();
+}
 
 builder.Services.AddHostedService(sp =>
 {
     var store = sp.GetRequiredService<PeerStore>();
-    RipeStatProvider? ripe = null;
-    try { ripe = sp.GetRequiredService<RipeStatProvider>(); } catch { }
+    PrefixService? prefixService = null;
+    try { prefixService = sp.GetRequiredService<PrefixService>(); } catch { }
 
     return new BgpServer(
         sp.GetRequiredService<AppConfig>(),
@@ -88,7 +91,7 @@ builder.Services.AddHostedService(sp =>
         sp.GetRequiredService<ILogger<BgpServer>>(),
         (ip, asn) => store.UpsertPeer(ip, asn),
         store,
-        ripe);
+        prefixService);
 });
 builder.Services.AddHostedService<ManagementApi>();