Added Prototype Lancache code/debug logging

DepotDownloader/CDNClientPool.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Threading;
 using System.Threading.Tasks;
 using SteamKit2.CDN;
@@ -20,12 +21,12 @@ namespace DepotDownloader
         public Client CDNClient { get; }
         public Server ProxyServer { get; private set; }
 
-        private readonly ConcurrentStack<Server> activeConnectionPool = [];
+        private readonly ConcurrentStack<Server> activeConnectionPool = new ConcurrentStack<Server>();
-        private readonly BlockingCollection<Server> availableServerEndpoints = [];
+        private readonly BlockingCollection<Server> availableServerEndpoints = new BlockingCollection<Server>();
 
-        private readonly AutoResetEvent populatePoolEvent = new(true);
+        private readonly AutoResetEvent populatePoolEvent = new AutoResetEvent(true);
         private readonly Task monitorTask;
-        private readonly CancellationTokenSource shutdownToken = new();
+        private readonly CancellationTokenSource shutdownToken = new CancellationTokenSource();
         public CancellationTokenSource ExhaustedToken { get; set; }
 
         public CDNClientPool(Steam3Session steamSession, uint appId)
@@ -34,7 +35,7 @@ namespace DepotDownloader
             this.appId = appId;
             CDNClient = new Client(steamSession.steamClient);
 
-            monitorTask = Task.Factory.StartNew(ConnectionPoolMonitorAsync).Unwrap();
+            monitorTask = Task.Factory.StartNew(ConnectionPoolMonitorAsync, TaskCreationOptions.LongRunning);
         }
 
         public void Shutdown()
@@ -47,19 +48,37 @@ namespace DepotDownloader
         {
             try
             {
-                var cdnServers = await this.steamSession.steamContent.GetServersForSteamPipe();
+                var cdnServers = await steamSession.steamContent.GetServersForSteamPipe().ConfigureAwait(false);
-                if (cdnServers != null)
-                {
                 return cdnServers;
             }
-            }
             catch (Exception ex)
             {
                 Console.WriteLine("Failed to retrieve content server list: {0}", ex.Message);
+                return null;
+            }
         }
 
+        private async Task<IPAddress> ResolveLancacheIpAsync(string hostname)
+        {
+            try
+            {
+                var hostEntry = await Dns.GetHostEntryAsync(hostname).ConfigureAwait(false);
+                return hostEntry.AddressList.FirstOrDefault(ip => IsPrivateIp(ip));
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine("Failed to resolve Lancache IP: {0}", ex.Message);
                 return null;
             }
+        }
+
+        private bool IsPrivateIp(IPAddress ip)
+        {
+            byte[] bytes = ip.GetAddressBytes();
+            return bytes[0] == 10 ||
+                   (bytes[0] == 172 && bytes[1] >= 16 && bytes[1] <= 31) ||
+                   (bytes[0] == 192 && bytes[1] == 168);
+        }
 
         private async Task ConnectionPoolMonitorAsync()
         {
@@ -69,7 +88,6 @@ namespace DepotDownloader
             {
                 populatePoolEvent.WaitOne(TimeSpan.FromSeconds(1));
 
-                // We want the Steam session so we can take the CellID from the session and pass it through to the ContentServer Directory Service
                 if (availableServerEndpoints.Count < ServerEndpointMinimumSize && steamSession.steamClient.IsConnected)
                 {
                     var servers = await FetchBootstrapServerListAsync().ConfigureAwait(false);
@@ -80,29 +98,42 @@ namespace DepotDownloader
                         return;
                     }
 
-                    ProxyServer = servers.Where(x => x.UseAsProxy).FirstOrDefault();
+                    ProxyServer = servers.FirstOrDefault(x => x.UseAsProxy);
 
-                    var weightedCdnServers = servers
+                    foreach (var server in servers)
-                        .Where(server =>
                     {
-                            var isEligibleForApp = server.AllowedAppIds.Length == 0 || server.AllowedAppIds.Contains(appId);
+                        if (server.Type == "SteamCache")
-                            return isEligibleForApp && (server.Type == "SteamCache" || server.Type == "CDN");
-                        })
-                        .Select(server =>
                         {
-                            AccountSettingsStore.Instance.ContentServerPenalty.TryGetValue(server.Host, out var penalty);
+                            var lancacheIp = await ResolveLancacheIpAsync(server.Host).ConfigureAwait(false);
-
+                            if (lancacheIp != null)
-                            return (server, penalty);
+                            {
-                        })
+                                var lancacheServer = new Server
-                        .OrderBy(pair => pair.penalty).ThenBy(pair => pair.server.WeightedLoad);
+                                {
+                                    Host = lancacheIp.ToString(),
+                                    Type = server.Type,
+                                    NumEntries = server.NumEntries,
+                                    WeightedLoad = server.WeightedLoad,
+                                    AllowedAppIds = server.AllowedAppIds.ToArray()
+                                };
 
-                    foreach (var (server, weight) in weightedCdnServers)
+                                // Downgrade connection to HTTP if Lancache server is found
+                                lancacheServer.Protocol = Server.ConnectionProtocol.HTTP;
+                                Console.WriteLine($"Found Lancache Server: {lancacheServer.Host}. Downgrading connection to HTTP.");
+                                availableServerEndpoints.Add(lancacheServer);
+                            }
+                        }
+                        else
+                        {
+                            var isEligibleForApp = server.AllowedAppIds.Length == 0 || server.AllowedAppIds.Contains(appId);
+                            if (isEligibleForApp && (server.Type == "SteamCache" || server.Type == "CDN"))
                             {
                                 for (var i = 0; i < server.NumEntries; i++)
                                 {
                                     availableServerEndpoints.Add(server);
                                 }
                             }
+                        }
+                    }
 
                     didPopulate = true;
                 }

DepotDownloader/Program.cs

@@ -20,13 +20,16 @@ namespace DepotDownloader
 
         static async Task<int> MainAsync(string[] args)
         {
+            // Add the SteamKitLogger as a listener to DebugLog
+            DebugLog.AddListener(new SteamKitLogger());
+
             if (args.Length == 0)
             {
                 PrintUsage();
                 return 1;
             }
 
-            DebugLog.Enabled = false;
+            DebugLog.Enabled = true;
 
             AccountSettingsStore.LoadFromFile("account.config");
 

DepotDownloader/SteamKitLogger.cs

@@ -0,0 +1,14 @@
+using SteamKit2;
+using System;
+
+public class SteamKitLogger : IDebugListener
+{
+    public void WriteLine(string category, string msg)
+    {
+        Console.WriteLine("[{0}] {1}", category, msg);
+    }
+}
+
+public interface ILog
+{
+}