gh-418 Implement data input plug-in engine and integration with SCP service

- Implement IInputDataPluginEngine and IInputDataPlugin
- Add unit tests
- Update SCP feature in integration test

Author: mocsharp

src/Api/IInputDataPlugin.cs

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2023 MONAI Consortium
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System.Threading.Tasks;
+using FellowOakDicom;
+using Monai.Deploy.InformaticsGateway.Api.Storage;
+
+namespace Monai.Deploy.InformaticsGateway.Api
+{
+    /// <summary>
+    /// <c>IInputDataPlugin</c> enables lightweight data processing over incoming data received from supported data ingestion
+    /// services.
+    /// Refer to <see cref="IInputDataPluginEngine" /> for additional details.
+    /// </summary>
+    public interface IInputDataPlugin
+    {
+        Task<(DicomFile dicomFile, FileStorageMetadata fileMetadata)> Execute(DicomFile dicomFile, FileStorageMetadata fileMetadata);
+    }
+}

src/Api/IInputDataPluginEngine.cs

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2023 MONAI Consortium
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using FellowOakDicom;
+using Monai.Deploy.InformaticsGateway.Api.Storage;
+
+namespace Monai.Deploy.InformaticsGateway.Api
+{
+    /// <summary>
+    /// <c>IInputDataPluginEngine</c> processes incoming data receivied from various supported services through
+    /// a list of plug-ins based on <see cref="IInputDataPlugin"/>.
+    /// Rules:
+    /// <list type="bullet">
+    /// <item>A list of plug-ins can be included with each export request, and each plug-in is executed in the order stored, processing one file at a time, enabling piping of the data before each file is exported.</item>
+    /// <item>Plugins MUST be lightweight and not hinder the export process</item>
+    /// <item>Plugins SHALL not accumulate files in memory or storage for bulk processing</item>
+    /// </list>
+    /// </summary>
+    public interface IInputDataPluginEngine
+    {
+        void Configure(IReadOnlyList<string> pluginAssemblies);
+
+        Task<(DicomFile dicomFile, FileStorageMetadata fileMetadata)> ExecutePlugins(DicomFile dicomFile, FileStorageMetadata fileMetadata);
+    }
+}

src/Api/MonaiApplicationEntity.cs

@@ -72,6 +72,8 @@ public class MonaiApplicationEntity : MongoDBEntityBase
         /// </summary>
         public List<string> Workflows { get; set; } = default!;
 
+        public List<string> PluginAssemblies { get; set; } = default!;
+
         /// <summary>
         /// Optional field to specify SOP Class UIDs to ignore.
         /// <see cref="IgnoredSopClasses"/> and <see cref="AllowedSopClasses"/> are mutually exclusive.
@@ -128,6 +130,8 @@ public void SetDefaultValues()
             IgnoredSopClasses ??= new List<string>();
 
             AllowedSopClasses ??= new List<string>();
+
+            PluginAssemblies ??= new List<string>();
         }
 
         public override string ToString()

src/Database/EntityFramework/Configuration/MonaiApplicationEntityConfiguration.cs

@@ -1,5 +1,5 @@
 /*
- * Copyright 2021-2022 MONAI Consortium
+ * Copyright 2021-2023 MONAI Consortium
  * Copyright 2021 NVIDIA Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -25,6 +25,7 @@
 namespace Monai.Deploy.InformaticsGateway.Database.EntityFramework.Configuration
 {
 #pragma warning disable CS8604, CS8603
+
     internal class MonaiApplicationEntityConfiguration : IEntityTypeConfiguration<MonaiApplicationEntity>
     {
         public void Configure(EntityTypeBuilder<MonaiApplicationEntity> builder)
@@ -51,6 +52,11 @@ public void Configure(EntityTypeBuilder<MonaiApplicationEntity> builder)
                         v => JsonSerializer.Serialize(v, jsonSerializerSettings),
                         v => JsonSerializer.Deserialize<List<string>>(v, jsonSerializerSettings))
                 .Metadata.SetValueComparer(valueComparer);
+            builder.Property(j => j.PluginAssemblies)
+                .HasConversion(
+                        v => JsonSerializer.Serialize(v, jsonSerializerSettings),
+                        v => JsonSerializer.Deserialize<List<string>>(v, jsonSerializerSettings))
+                .Metadata.SetValueComparer(valueComparer);
             builder.Property(j => j.IgnoredSopClasses)
                 .HasConversion(
                         v => JsonSerializer.Serialize(v, jsonSerializerSettings),
@@ -67,5 +73,6 @@ public void Configure(EntityTypeBuilder<MonaiApplicationEntity> builder)
             builder.Ignore(p => p.Id);
         }
     }
+
 #pragma warning restore CS8604, CS8603
 }