add exceptions handler

Azaion.Api/BusinessExceptionHandler.cs

@@ -0,0 +1,28 @@
+
+using Microsoft.AspNetCore.Diagnostics;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json;
+
+namespace Azaion.Common;
+
+public class BusinessExceptionHandler(ILogger<BusinessExceptionHandler> logger) : IExceptionHandler
+{
+    public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken)
+    {
+        if (exception is not BusinessException ex)
+            return false;
+
+        logger.LogWarning(exception, ex.Message);
+        httpContext.Response.StatusCode = StatusCodes.Status409Conflict;
+        httpContext.Response.ContentType = "application/json";
+
+        var err = JsonConvert.SerializeObject(new
+        {
+            ErrorCode = ex.ExceptionEnum,
+            ex.Message
+        });
+        await httpContext.Response.WriteAsync(err, cancellationToken).ConfigureAwait(false);
+        return true;
+    }
+}

Azaion.Api/Program.cs

@@ -1,4 +1,5 @@
 using System.Text;
+using Azaion.Common;
 using Azaion.Common.Configs;
 using Azaion.Common.Database;
 using Azaion.Common.Entities;
@@ -106,6 +107,7 @@ builder.Services.AddLazyCache();
 builder.Services.AddScoped<ICache, MemoryCache>();
 
 builder.Services.AddValidatorsFromAssemblyContaining<RegisterUserValidator>();
+builder.Services.AddExceptionHandler<BusinessExceptionHandler>();
 
 var app = builder.Build();
 
@@ -181,5 +183,6 @@ app.MapPut("/users/queue-offsets/{email}",
     .RequireAuthorization()
     .WithOpenApi(op => new OpenApiOperation(op) { Summary = "Updates user queue offsets" });
 
+app.UseExceptionHandler(_ => {});
 
 app.Run();

Azaion.Common/BusinessException.cs

@@ -12,7 +12,7 @@ public class BusinessException(ExceptionEnum exEnum) : Exception(GetMessage(exEn
         ExceptionDescriptions = EnumExtensions.GetDescriptions<ExceptionEnum>();
     }
 
-    private ExceptionEnum ExceptionEnum { get; set; } = exEnum;
+    public ExceptionEnum ExceptionEnum { get; set; } = exEnum;
 
     public static string GetMessage(ExceptionEnum exEnum) => ExceptionDescriptions.GetValueOrDefault(exEnum) ?? exEnum.ToString();
 }