Added Retry Policy and Launcher Error.

Included ErrorHelper for mapping.

AlayaCore.sln.DotSettings.user

@@ -21,5 +21,6 @@
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 	<s:String x:Key="/Default/CodeInspection/ExcludedFiles/FilesAndFoldersToSkip2/=7020124F_002D9FFC_002D4AC3_002D8F3D_002DAAB8E0240759_002Ff_003AProcessWrapper_002Ecs_002Fl_003A_002E_002E_003F_002E_002E_003F_002E_002E_003FLibrary_003FApplication_0020Support_003FJetBrains_003FRider2026_002E1_003Fresharper_002Dhost_003FDecompilerCache_003Fdecompiler_003F11957ce69cb24b8a8e3979c0980ffeb33a400_003F97_003F3a1ed5f7_003FProcessWrapper_002Ecs/@EntryIndexedValue">ForceIncluded</s:String>
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AlayaCore/Abstractions/Interfaces/Clients/IHttpClient.cs

@@ -11,7 +11,5 @@ namespace AlayaCore.Abstractions.Interfaces.Clients
             Uri uri,
             HttpCompletionOption completionOption,
             CancellationToken cancellationToken);
-        
-        HttpClient HttpClient { get; }
     }
 }

AlayaCore/Abstractions/Interfaces/Policies/IRetryPolicy.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace AlayaCore.Abstractions.Interfaces.Policies
+{
+    public interface IRetryPolicy
+    {
+        Task ExecuteAsync(
+            Func<CancellationToken, Task> operation,
+            string operationName,
+            CancellationToken cancellationToken = default);
+
+        Task<T> ExecuteAsync<T>(
+            Func<CancellationToken, Task<T>> operation,
+            string operationName,
+            CancellationToken cancellationToken = default);
+    }
+}

AlayaCore/Clients/DefaultHttpClient.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces.Clients;
+
+namespace AlayaCore.Clients
+{
+    public sealed class DefaultHttpClient : IHttpClient
+    {
+        private readonly HttpClient _httpClient;
+        private bool _disposed;
+
+        public DefaultHttpClient(HttpClient httpClient)
+        {
+            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+        }
+
+        public Task<HttpResponseMessage> GetAsync(
+            Uri requestUri,
+            HttpCompletionOption completionOption,
+            CancellationToken cancellationToken = default)
+        {
+            if (requestUri == null)
+            {
+                throw new ArgumentNullException(nameof(requestUri));
+            }
+
+            if (!requestUri.IsAbsoluteUri)
+            {
+                throw new ArgumentException("Request URI must be absolute.", nameof(requestUri));
+            }
+
+            ThrowIfDisposed();
+
+            return _httpClient.GetAsync(requestUri, completionOption, cancellationToken);
+        }
+
+        public void Dispose()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            _httpClient.Dispose();
+            _disposed = true;
+        }
+
+        private void ThrowIfDisposed()
+        {
+            if (_disposed)
+            {
+                throw new ObjectDisposedException(nameof(DefaultHttpClient));
+            }
+        }
+    }
+}

AlayaCore/Errors/LauncherError.cs

@@ -0,0 +1,19 @@
+using System;
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Errors
+{
+    public sealed class LauncherError
+    {
+        public LauncherErrorType Type { get; }
+        public string Message { get; }
+        public Exception Exception { get; }
+
+        public LauncherError(LauncherErrorType type, string message, Exception exception)
+        {
+            Type = type;
+            Message = message;
+            Exception = exception;
+        }
+    }
+}

AlayaCore/Models/Configuration/LauncherUpdateServiceOptions.cs

@@ -1,3 +1,6 @@
+using System;
+using System.IO;
+
 namespace AlayaCore.Models.Configuration
 {
     public sealed class LauncherUpdateServiceOptions
@@ -10,5 +13,8 @@ namespace AlayaCore.Models.Configuration
 
         public string AlayaUpdaterPath { get; set; }
         public bool ForceUpdate { get; set; }
+
+        public static LauncherUpdateServiceOptions Default { get; } =
+            new LauncherUpdateServiceOptions(Path.Combine(AppContext.BaseDirectory, "Data", "Updater"), false);
     }
 }

AlayaCore/Models/Configuration/ManifestServiceOptions.cs

@@ -4,25 +4,23 @@ namespace AlayaCore.Models.Configuration
 {
     public sealed class ManifestServiceOptions
     {
-        public Uri CoreManifestUri { get; }
+        public Uri AlayaManifestUri { get; }
         public Uri LauncherManifestUri { get; }
-        public string CoreManifestSha512Hash { get; }
+        public string AlayaManifestSha512Hash { get; }
         public string LauncherManifestSha512Hash { get; }
-        public string ManifestDirectoryPath { get; }
 
         public ManifestServiceOptions(
-            Uri coreManifestUri,
+            Uri alayaManifestUri,
             Uri launcherManifestUri,
-            string coreManifestSha512Hash,
+            string alayaManifestSha512Hash,
-            string launcherManifestSha512Hash,
+            string launcherManifestSha512Hash)
-            string manifestDirectoryPath)
         {
-            CoreManifestUri = coreManifestUri ?? throw new ArgumentNullException(nameof(coreManifestUri));
+            AlayaManifestUri = alayaManifestUri ?? throw new ArgumentNullException(nameof(alayaManifestUri));
             LauncherManifestUri = launcherManifestUri ?? throw new ArgumentNullException(nameof(launcherManifestUri));
 
-            if (!CoreManifestUri.IsAbsoluteUri)
+            if (!AlayaManifestUri.IsAbsoluteUri)
             {
-                throw new ArgumentException("Core manifest URI must be absolute.", nameof(coreManifestUri));
+                throw new ArgumentException("Core manifest URI must be absolute.", nameof(alayaManifestUri));
             }
 
             if (!LauncherManifestUri.IsAbsoluteUri)
@@ -30,9 +28,9 @@ namespace AlayaCore.Models.Configuration
                 throw new ArgumentException("Launcher manifest URI must be absolute.", nameof(launcherManifestUri));
             }
 
-            if (string.IsNullOrWhiteSpace(coreManifestSha512Hash))
+            if (string.IsNullOrWhiteSpace(alayaManifestSha512Hash))
             {
-                throw new ArgumentException("Core manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(coreManifestSha512Hash));
+                throw new ArgumentException("Core manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(alayaManifestSha512Hash));
             }
 
             if (string.IsNullOrWhiteSpace(launcherManifestSha512Hash))
@@ -40,14 +38,12 @@ namespace AlayaCore.Models.Configuration
                 throw new ArgumentException("Launcher manifest SHA-512 hash cannot be null, empty, or whitespace.", nameof(launcherManifestSha512Hash));
             }
 
-            if (string.IsNullOrWhiteSpace(manifestDirectoryPath))
+            AlayaManifestSha512Hash = alayaManifestSha512Hash;
-            {
+            LauncherManifestSha512Hash = launcherManifestSha512Hash;
-                throw new ArgumentException("Manifest directory path cannot be null, empty, or whitespace.", nameof(manifestDirectoryPath));
         }
 
-            CoreManifestSha512Hash = coreManifestSha512Hash;
+        public static ManifestServiceOptions Default { get; } = new ManifestServiceOptions(
-            LauncherManifestSha512Hash = launcherManifestSha512Hash;
+            new Uri("INSERT-ALAYA-URL", UriKind.Absolute),
-            ManifestDirectoryPath = manifestDirectoryPath;
+            new Uri("INSERT-LAUNCHER-URL", UriKind.Absolute), "INSERT-ALAYA-HASH", "INSERT-LAUNCHER-HASH");
-        }
     }
 }

AlayaCore/Models/Configuration/ModrinthConnectionOptions.cs

@@ -8,5 +8,8 @@ namespace AlayaCore.Models.Configuration
         }
 
         public string BaseApiUrl { get; }
+
+        public static ModrinthConnectionOptions Default { get; } =
+            new ModrinthConnectionOptions("https://api.modrinth.com/v2/");
     }
 }

AlayaCore/Models/Configuration/RetryPolicyOptions.cs

@@ -0,0 +1,12 @@
+namespace AlayaCore.Models.Configuration
+{
+    public sealed class RetryPolicyOptions
+    {
+        public int MaxAttempts { get; set; } = 3;
+        public int BaseDelayMilliseconds { get; set; } = 500;
+        public double BackoffMultiplier { get; set; } = 2.0;
+        public int MaxDelayMilliseconds { get; set; } = 3000;
+        
+        public static  RetryPolicyOptions Default { get; } = new();
+    }
+}

AlayaCore/Policies/RetryPolicy.cs

@@ -0,0 +1,216 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using AlayaCore.Abstractions.Interfaces.Policies;
+using AlayaCore.Models.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace AlayaCore.Services
+{
+    public sealed class RetryPolicy : IRetryPolicy
+    {
+        private readonly RetryPolicyOptions _options;
+        private readonly ILogger<RetryPolicy> _logger;
+        
+        private static readonly Random _random = new Random();
+
+        public RetryPolicy(
+            RetryPolicyOptions options,
+            ILogger<RetryPolicy> logger)
+        {
+            _options = options ?? throw new ArgumentNullException(nameof(options));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public async Task ExecuteAsync(
+            Func<CancellationToken, Task> operation,
+            string operationName,
+            CancellationToken cancellationToken = default)
+        {
+            if (operation == null)
+            {
+                throw new ArgumentNullException(nameof(operation));
+            }
+
+            if (string.IsNullOrWhiteSpace(operationName))
+            {
+                throw new ArgumentException("Operation name cannot be null, empty, or whitespace.", nameof(operationName));
+            }
+
+            await ExecuteAsync<object?>(
+                async token =>
+                {
+                    await operation(token).ConfigureAwait(false);
+                    return null;
+                },
+                operationName,
+                cancellationToken).ConfigureAwait(false);
+        }
+
+        public async Task<T> ExecuteAsync<T>(
+            Func<CancellationToken, Task<T>> operation,
+            string operationName,
+            CancellationToken cancellationToken = default)
+        {
+            if (operation == null)
+            {
+                throw new ArgumentNullException(nameof(operation));
+            }
+
+            if (string.IsNullOrWhiteSpace(operationName))
+            {
+                throw new ArgumentException("Operation name cannot be null, empty, or whitespace.", nameof(operationName));
+            }
+
+            ValidateOptions();
+
+            Exception? lastException = null;
+
+            for (int attempt = 1; attempt <= _options.MaxAttempts; attempt++)
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+
+                try
+                {
+                    if (attempt > 1)
+                    {
+                        _logger.LogInformation(
+                            "Retrying operation {OperationName}. Attempt {Attempt} of {MaxAttempts}.",
+                            operationName,
+                            attempt,
+                            _options.MaxAttempts);
+                    }
+
+                    return await operation(cancellationToken).ConfigureAwait(false);
+                }
+                catch (OperationCanceledException ex) when (!cancellationToken.IsCancellationRequested && IsRetryable(ex))
+                {
+                    lastException = ex;
+
+                    if (attempt == _options.MaxAttempts)
+                    {
+                        _logger.LogError(
+                            ex,
+                            "Operation {OperationName} failed after {MaxAttempts} attempts due to repeated timeout or cancellation-like transient failures.",
+                            operationName,
+                            _options.MaxAttempts);
+
+                        throw;
+                    }
+
+                    TimeSpan delay = CalculateDelay(attempt);
+
+                    _logger.LogWarning(
+                        ex,
+                        "Operation {OperationName} timed out or was transiently cancelled on attempt {Attempt} of {MaxAttempts}. Retrying after {DelayMs}ms.",
+                        operationName,
+                        attempt,
+                        _options.MaxAttempts,
+                        (int)delay.TotalMilliseconds);
+
+                    await Task.Delay(delay, cancellationToken).ConfigureAwait(false);
+                }
+                catch (OperationCanceledException)
+                {
+                    _logger.LogInformation(
+                        "Operation {OperationName} was cancelled by the caller.",
+                        operationName);
+
+                    throw;
+                }
+                catch (Exception ex) when (IsRetryable(ex))
+                {
+                    lastException = ex;
+
+                    if (attempt == _options.MaxAttempts)
+                    {
+                        _logger.LogError(
+                            ex,
+                            "Operation {OperationName} failed after {MaxAttempts} attempts.",
+                            operationName,
+                            _options.MaxAttempts);
+
+                        throw;
+                    }
+
+                    TimeSpan delay = CalculateDelay(attempt);
+
+                    _logger.LogWarning(
+                        ex,
+                        "Operation {OperationName} failed with a transient error on attempt {Attempt} of {MaxAttempts}. Retrying after {DelayMs}ms.",
+                        operationName,
+                        attempt,
+                        _options.MaxAttempts,
+                        (int)delay.TotalMilliseconds);
+
+                    await Task.Delay(delay, cancellationToken).ConfigureAwait(false);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(
+                        ex,
+                        "Operation {OperationName} failed with a non-retryable error on attempt {Attempt}.",
+                        operationName,
+                        attempt);
+
+                    throw;
+                }
+            }
+
+            throw new InvalidOperationException(
+                $"Retry policy exited unexpectedly for operation '{operationName}'.",
+                lastException);
+        }
+
+        private void ValidateOptions()
+        {
+            if (_options.MaxAttempts <= 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.MaxAttempts must be greater than zero.");
+            }
+
+            if (_options.BaseDelayMilliseconds < 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.BaseDelayMilliseconds cannot be negative.");
+            }
+
+            if (_options.BackoffMultiplier < 1d)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.BackoffMultiplier must be greater than or equal to 1.");
+            }
+
+            if (_options.MaxDelayMilliseconds < 0)
+            {
+                throw new InvalidOperationException("RetryPolicyOptions.MaxDelayMilliseconds cannot be negative.");
+            }
+        }
+
+        private static bool IsRetryable(Exception exception)
+        {
+            return exception switch
+            {
+                HttpRequestException => true,
+                IOException => true,
+                TaskCanceledException => true,
+                InvalidDataException => false,
+                ArgumentException => false,
+                InvalidOperationException => false,
+                _ => false
+            };
+        }
+
+        private TimeSpan CalculateDelay(int attempt)
+        {
+            double exponentialDelay = _options.BaseDelayMilliseconds *
+                                      Math.Pow(_options.BackoffMultiplier, attempt - 1);
+
+            double cappedDelay = Math.Min(exponentialDelay, _options.MaxDelayMilliseconds);
+
+            int jitterMilliseconds = _random.Next(0, 150);
+
+            return TimeSpan.FromMilliseconds(cappedDelay + jitterMilliseconds);
+        }
+    }
+}

AlayaCore/Services/HttpDownloadService.cs

@@ -6,6 +6,7 @@ using System.Security.Cryptography;
 using System.Threading;
 using System.Threading.Tasks;
 using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Models.Progress;
 using AlayaCore.Models.Results;
@@ -18,13 +19,16 @@ namespace AlayaCore.Services
         private const int BUFFER_SIZE = 81920;
 
         private readonly IHttpClient _httpClient;
+        private readonly IRetryPolicy _retryPolicy;
         private readonly ILogger<HttpDownloadService> _logger;
 
         public HttpDownloadService(
             IHttpClient httpClient,
+            IRetryPolicy retryPolicy,
             ILogger<HttpDownloadService> logger)
         {
             _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
@@ -104,10 +108,15 @@ namespace AlayaCore.Services
 
             try
             {
+                DownloadResult result = await _retryPolicy.ExecuteAsync(
+                    async token =>
+                    {
+                        DeleteFileIfExists(tempFilePath);
+
                         using HttpResponseMessage response = await _httpClient.GetAsync(
                             sourceUri,
                             HttpCompletionOption.ResponseHeadersRead,
-                    cancellationToken).ConfigureAwait(false);
+                            token).ConfigureAwait(false);
 
                         response.EnsureSuccessStatusCode();
 
@@ -144,7 +153,10 @@ namespace AlayaCore.Services
                         byte[] buffer = new byte[BUFFER_SIZE];
                         Stopwatch stopwatch = Stopwatch.StartNew();
 
-                _logger.LogDebug("Streaming download content for {FileName} into temporary file {TempFilePath}.", fileName, tempFilePath);
+                        _logger.LogDebug(
+                            "Streaming download content for {FileName} into temporary file {TempFilePath}.",
+                            fileName,
+                            tempFilePath);
 
                         while (true)
                         {
@@ -152,7 +164,7 @@ namespace AlayaCore.Services
                                 buffer,
                                 0,
                                 buffer.Length,
-                        cancellationToken).ConfigureAwait(false);
+                                token).ConfigureAwait(false);
 
                             if (bytesRead == 0)
                             {
@@ -163,7 +175,7 @@ namespace AlayaCore.Services
                                 buffer,
                                 0,
                                 bytesRead,
-                        cancellationToken).ConfigureAwait(false);
+                                token).ConfigureAwait(false);
 
                             sha512.TransformBlock(buffer, 0, bytesRead, null, 0);
 
@@ -185,7 +197,7 @@ namespace AlayaCore.Services
                         }
 
                         sha512.TransformFinalBlock(Array.Empty<byte>(), 0, 0);
-                await fileStream.FlushAsync(cancellationToken).ConfigureAwait(false);
+                        await fileStream.FlushAsync(token).ConfigureAwait(false);
 
                         string actualHash = ConvertToLowerHex(sha512.Hash);
                         if (!string.Equals(actualHash, normalizedExpectedHash, StringComparison.OrdinalIgnoreCase))
@@ -235,6 +247,11 @@ namespace AlayaCore.Services
                             outcome,
                             hashVerified: true,
                             bytesDownloaded: bytesDownloaded);
+                    },
+                    $"download:{fileName}",
+                    cancellationToken).ConfigureAwait(false);
+
+                return result;
             }
             catch (OperationCanceledException)
             {

AlayaCore/Services/ManifestService.cs

@@ -5,6 +5,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Models.Configuration;
 using AlayaCore.Models.Manifests;
@@ -26,6 +27,7 @@ namespace AlayaCore.Services
         private readonly IHttpClient _httpClient;
         private readonly IFileStore _fileStore;
         private readonly ManifestServiceOptions _options;
+        private readonly IRetryPolicy _retryPolicy;
         private readonly ILogger<ManifestService> _logger;
 
         public ManifestService(
@@ -33,12 +35,14 @@ namespace AlayaCore.Services
             IHttpClient httpClient,
             IFileStore fileStore,
             ManifestServiceOptions options,
+            IRetryPolicy retryPolicy,
             ILogger<ManifestService> logger)
         {
             _downloadService = downloadService ?? throw new ArgumentNullException(nameof(downloadService));
             _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
             _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
             _options = options ?? throw new ArgumentNullException(nameof(options));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
@@ -48,13 +52,13 @@ namespace AlayaCore.Services
 
             _logger.LogInformation(
                 "Downloading and loading Alaya manifest from {ManifestUri} to {DestinationPath}.",
-                _options.CoreManifestUri,
+                _options.AlayaManifestUri,
                 destinationPath);
 
             return DownloadAndLoadManifestAsync<ManifestDto, ManifestModel>(
-                _options.CoreManifestUri,
+                _options.AlayaManifestUri,
                 destinationPath,
-                _options.CoreManifestSha512Hash,
+                _options.AlayaManifestSha512Hash,
                 static dto => dto.ToModel(),
                 cancellationToken);
         }
@@ -144,24 +148,24 @@ namespace AlayaCore.Services
 
         public async Task<Version> GetRemoteCoreManifestVersionAsync(CancellationToken cancellationToken = default)
         {
-            _logger.LogDebug("Fetching remote Alaya manifest version from {ManifestUri}.", _options.CoreManifestUri);
+            _logger.LogDebug("Fetching remote Alaya manifest version from {ManifestUri}.", _options.AlayaManifestUri);
 
             ManifestModel remoteManifest = await GetRemoteManifestAsync<ManifestDto, ManifestModel>(
-                _options.CoreManifestUri,
+                _options.AlayaManifestUri,
                 static dto => dto.ToModel(),
                 cancellationToken).ConfigureAwait(false);
 
             if (remoteManifest.AlayaVersion == null)
             {
-                _logger.LogError("Remote Alaya manifest from {ManifestUri} did not contain a valid version.", _options.CoreManifestUri);
+                _logger.LogError("Remote Alaya manifest from {ManifestUri} did not contain a valid version.", _options.AlayaManifestUri);
                 throw new InvalidDataException(
-                    $"Remote core manifest from '{_options.CoreManifestUri}' does not contain a valid version.");
+                    $"Remote core manifest from '{_options.AlayaManifestUri}' does not contain a valid version.");
             }
 
             _logger.LogInformation(
                 "Fetched remote Alaya manifest version {RemoteVersion} from {ManifestUri}.",
                 remoteManifest.AlayaVersion,
-                _options.CoreManifestUri);
+                _options.AlayaManifestUri);
 
             return remoteManifest.AlayaVersion;
         }
@@ -309,11 +313,17 @@ namespace AlayaCore.Services
                 manifestUri,
                 destinationPath);
 
+            await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
                     await _downloadService.DownloadFileAsync(
                         manifestUri,
                         destinationPath,
                         sha512Hash,
-                cancellationToken: cancellationToken).ConfigureAwait(false);
+                        cancellationToken: token).ConfigureAwait(false);
+                },
+                $"manifest-download:{Path.GetFileName(destinationPath)}",
+                cancellationToken).ConfigureAwait(false);
 
             if (!File.Exists(destinationPath))
             {
@@ -368,10 +378,13 @@ namespace AlayaCore.Services
 
             _logger.LogDebug("Fetching remote manifest from {ManifestUri}.", manifestUri);
 
+            return await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
                     using HttpResponseMessage response = await _httpClient.GetAsync(
                         manifestUri,
                         HttpCompletionOption.ResponseContentRead,
-                cancellationToken).ConfigureAwait(false);
+                        token).ConfigureAwait(false);
 
                     response.EnsureSuccessStatusCode();
 
@@ -393,6 +406,9 @@ namespace AlayaCore.Services
                     _logger.LogDebug("Successfully fetched and mapped remote manifest from {ManifestUri}.", manifestUri);
 
                     return model;
+                },
+                $"manifest-fetch:{manifestUri.AbsolutePath}",
+                cancellationToken).ConfigureAwait(false);
         }
 
         private TModel? DeserializeAndMapManifest<TDto, TModel>(

AlayaCore/Services/ModService.cs

@@ -7,6 +7,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using AlayaCore.Abstractions.Interfaces;
 using AlayaCore.Abstractions.Interfaces.Clients;
+using AlayaCore.Abstractions.Interfaces.Policies;
 using AlayaCore.Abstractions.Interfaces.Services;
 using AlayaCore.Installation;
 using AlayaCore.Models;
@@ -30,6 +31,7 @@ namespace AlayaCore.Services
         private readonly ModrinthConnectionOptions _options;
         private readonly IHttpClient _httpClient;
         private readonly IFileStore _fileStore;
+        private readonly IRetryPolicy _retryPolicy;
         private readonly ILogger<ModService> _logger;
 
         public ModService(
@@ -37,12 +39,14 @@ namespace AlayaCore.Services
             ModrinthConnectionOptions options,
             IHttpClient httpClient,
             IFileStore fileStore,
+            IRetryPolicy retryPolicy,
             ILogger<ModService> logger)
         {
             _downloadService = downloadService ?? throw new ArgumentNullException(nameof(downloadService));
             _options = options ?? throw new ArgumentNullException(nameof(options));
             _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
             _fileStore = fileStore ?? throw new ArgumentNullException(nameof(fileStore));
+            _retryPolicy = retryPolicy ?? throw new ArgumentNullException(nameof(retryPolicy));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
         }
 
@@ -213,10 +217,13 @@ namespace AlayaCore.Services
                 fileEntry.FileName,
                 versionEndpoint);
 
+            return await _retryPolicy.ExecuteAsync(
+                async token =>
+                {
                     using HttpResponseMessage response = await _httpClient.GetAsync(
                         new Uri(versionEndpoint, UriKind.Absolute),
                         HttpCompletionOption.ResponseContentRead,
-                cancellationToken).ConfigureAwait(false);
+                        token).ConfigureAwait(false);
 
                     response.EnsureSuccessStatusCode();
 
@@ -343,6 +350,9 @@ namespace AlayaCore.Services
                         result);
 
                     return result;
+                },
+                $"mod-metadata:{fileEntry.FileName}",
+                cancellationToken).ConfigureAwait(false);
         }
 
         private string BuildVersionEndpoint(string sha512Hash)

AlayaCore/Utilities/Enums/LauncherErrorType.cs

@@ -0,0 +1,16 @@
+namespace AlayaCore.Utilities.Enums
+{
+    public enum LauncherErrorType
+    {
+        Unknown,
+        Network,
+        Manifest,
+        Authentication,
+        Download,
+        Installation,
+        Update,
+        Launch,
+        Configuration,
+        Cancelled
+    }
+}

AlayaCore/Utilities/Helpers/ErrorHelper.cs

@@ -0,0 +1,56 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using AlayaCore.Utilities.Enums;
+
+namespace AlayaCore.Errors
+{
+    public static class ErrorHelper
+    {
+        public static LauncherError Map(Exception exception)
+        {
+            if (exception == null)
+            {
+                throw new ArgumentNullException(nameof(exception));
+            }
+
+            return exception switch
+            {
+                OperationCanceledException => new LauncherError(
+                    LauncherErrorType.Cancelled,
+                    "The operation was cancelled.",
+                    exception),
+
+                HttpRequestException => new LauncherError(
+                    LauncherErrorType.Network,
+                    "A network error occurred.",
+                    exception),
+
+                IOException => new LauncherError(
+                    LauncherErrorType.Network,
+                    "A file or network I/O error occurred.",
+                    exception),
+
+                InvalidDataException => new LauncherError(
+                    LauncherErrorType.Manifest,
+                    "Invalid or corrupt data was encountered.",
+                    exception),
+
+                ArgumentException => new LauncherError(
+                    LauncherErrorType.Configuration,
+                    "Invalid configuration or input.",
+                    exception),
+
+                InvalidOperationException => new LauncherError(
+                    LauncherErrorType.Launch,
+                    "The operation could not be completed due to an invalid state.",
+                    exception),
+
+                _ => new LauncherError(
+                    LauncherErrorType.Unknown,
+                    "An unexpected error occurred.",
+                    exception)
+            };
+        }
+    }
+}

AlayaCore/Utilities/Helpers/OptionsHelper.cs

@@ -0,0 +1,21 @@
+using AlayaCore.Models.Configuration;
+
+namespace AlayaCore.Utilities.Helpers
+{
+    public static class OptionsHelper
+    {
+        public static (LauncherUpdateServiceOptions LaunchUpdater, LauncherOptions Launcher,
+            GameOptions Game, ManifestServiceOptions Manifest, ModrinthConnectionOptions Modrinth,
+            RetryPolicyOptions RetryPolicy) GetDefaultOptions()
+        {
+            LauncherUpdateServiceOptions lso = LauncherUpdateServiceOptions.Default;
+            LauncherOptions lo = LauncherOptions.Default;
+            GameOptions go = GameOptions.Default;
+            ManifestServiceOptions mso = ManifestServiceOptions.Default;
+            ModrinthConnectionOptions mco = ModrinthConnectionOptions.Default;
+            RetryPolicyOptions rpo = RetryPolicyOptions.Default;
+
+            return (lso, lo, go, mso, mco, rpo);
+        }
+    }
+}