fix: reuse S3 client and bound its timeout/retries

SW.CloudFiles.S3.Extensions/IServiceCollectionExtensions.cs

@@ -130,7 +130,7 @@ public static IServiceCollection AddS3CloudFiles(this IServiceCollection service
         }
 
         serviceCollection.AddSingleton<CloudFilesOptions>(cloudFilesOptions);
-        serviceCollection.AddTransient<ICloudFilesService, CloudFilesService>();
+        serviceCollection.AddSingleton<ICloudFilesService, CloudFilesService>();
 
         return serviceCollection;
     }

SW.CloudFiles.S3/Extensions/CloudFilesOptionsExtensions.cs

@@ -9,14 +9,16 @@ namespace SW.CloudFiles.S3;
 public static class CloudFilesOptionsExtensions
 {
     /// <summary>Creates a configured <see cref="AmazonS3Client"/> from the given options.</summary>
-    public static AmazonS3Client CreateClient(this CloudFilesOptions cloudFilesOptions)
+    public static AmazonS3Client CreateClient(this S3CloudFilesOptions cloudFilesOptions)
     {
         var clientConfig = new AmazonS3Config
         {
             RegionEndpoint = RegionEndpoint.USEast1,
             ServiceURL = cloudFilesOptions.ServiceUrl,
             UseHttp = new Uri(cloudFilesOptions.ServiceUrl).Scheme.ToLower() == "http",
-            ForcePathStyle = true
+            ForcePathStyle = true,
+            Timeout = TimeSpan.FromSeconds(cloudFilesOptions.TimeoutSeconds),
+            MaxErrorRetry = cloudFilesOptions.MaxErrorRetry
         };
 
         return new AmazonS3Client(cloudFilesOptions.AccessKeyId, cloudFilesOptions.SecretAccessKey, clientConfig);

SW.CloudFiles.S3/S3CloudFilesOptions.cs

@@ -10,4 +10,10 @@ public class S3CloudFilesOptions : CloudFilesOptions
     /// Lifecycle rules are: temp1/ (1 day), temp7/ (7 days), temp30/ (30 days), temp365/ (365 days).
     /// </summary>
     public bool DisableAutoLifecycle { get; set; }
+
+    /// <summary>Per-request timeout, in seconds, for the underlying <see cref="Amazon.S3.AmazonS3Client"/>. Defaults to 15.</summary>
+    public int TimeoutSeconds { get; set; } = 15;
+
+    /// <summary>Max automatic retries for the underlying <see cref="Amazon.S3.AmazonS3Client"/>. Defaults to 2.</summary>
+    public int MaxErrorRetry { get; set; } = 2;
 }

SW.CloudFiles.S3/Services/CloudFilesService.cs

@@ -20,7 +20,7 @@ public class CloudFilesService : IDisposable, ICloudFilesService
     public CloudFilesService(CloudFilesOptions cloudFilesOptions)
     {
         this.cloudFilesOptions = cloudFilesOptions;
-        client = cloudFilesOptions.CreateClient();
+        client = ((S3CloudFilesOptions)cloudFilesOptions).CreateClient();
     }
 
     /// <inheritdoc/>