infrastructure DI

dotnet/AipsCore/AipsCore.csproj

@@ -8,6 +8,8 @@
 
     <ItemGroup>
       <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.2" />
+      <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.2" />
+      <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.0" />
     </ItemGroup>
 
 </Project>

dotnet/AipsCore/Infrastructure/DI/AipsRegistrationExtensions.cs

@@ -0,0 +1,19 @@
+using AipsCore.Application.Abstract;
+using AipsCore.Application.Common.Dispatcher;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace AipsCore.Infrastructure.DI;
+
+public static class AipsRegistrationExtensions
+{
+    public static IServiceCollection AddAips(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddHandlersFromAssembly(typeof(Dispatcher).Assembly);
+        services.AddSingleton<IDispatcher, Dispatcher>();
+
+        services.AddPersistence(configuration);
+        
+        return services;
+    }
+}

dotnet/AipsCore/Infrastructure/DI/Configuration/ConfigurationEnvExtensions.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.Configuration;
+
+namespace AipsCore.Infrastructure.DI.Configuration;
+
+public static class ConfigurationEnvExtensions
+{
+    private const string DbConnStringKey = "DB_CONN_STRING";
+
+    public static string GetEnvConnectionString(this IConfiguration configuration)
+    {
+        return configuration.GetEnvForSure(DbConnStringKey);
+    }
+
+    private static string GetEnvForSure(this IConfiguration configuration, string key)
+    {
+        var value = configuration[key];
+
+        if (value is null)
+        {
+            throw new ConfigurationException(key);
+        }
+        
+        return value;
+    }
+}

dotnet/AipsCore/Infrastructure/DI/Configuration/ConfigurationException.cs

@@ -0,0 +1,9 @@
+namespace AipsCore.Infrastructure.DI.Configuration;
+
+public class ConfigurationException : Exception
+{
+    public ConfigurationException(string key)
+        : base($"Env configuration error, key '{key}' not set.")
+    {
+    }
+}

dotnet/AipsCore/Infrastructure/DI/HandlerRegistrationExtensions.cs

@@ -0,0 +1,42 @@
+using System.Reflection;
+using AipsCore.Application.Abstract.Command;
+using AipsCore.Application.Abstract.Query;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace AipsCore.Infrastructure.DI;
+
+public static class HandlerRegistrationExtensions
+{
+    public static IServiceCollection AddHandlersFromAssembly(this IServiceCollection services, Assembly assembly)
+    {
+        var handlerInterfaces = new[]
+        {
+            typeof(ICommandHandler<>),
+            typeof(ICommandHandler<,>),
+            typeof(IQueryHandler<,>)
+        };
+
+        var types = assembly.GetTypes()
+            .Where(t => t is { IsAbstract: false, IsInterface: false });
+
+        foreach (var type in types)
+        {
+            var interfaces = type.GetInterfaces();
+
+            foreach (var @interface in interfaces)
+            {
+                if (!@interface.IsGenericType)
+                    continue;
+
+                var genericDef = @interface.GetGenericTypeDefinition();
+
+                if (!handlerInterfaces.Contains(genericDef))
+                    continue;
+                
+                services.AddScoped(@interface, type);
+            }
+        }
+
+        return services;
+    }
+}

dotnet/AipsCore/Infrastructure/DI/PersistenceRegistrationExtensions.cs

@@ -0,0 +1,20 @@
+using AipsCore.Infrastructure.DI.Configuration;
+using AipsCore.Infrastructure.Persistence.Db;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace AipsCore.Infrastructure.DI;
+
+public static class PersistenceRegistrationExtensions
+{
+    public static IServiceCollection AddPersistence(this IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddDbContext<AipsDbContext>(options =>
+        {
+            options.UseNpgsql(configuration.GetEnvConnectionString());
+        });
+        
+        return services;
+    }
+}