Add MultiTenancyMiddlewareErrorPageBuilder to show exception.

Resolve #3503

framework/src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/AbpAspNetCoreMultiTenancyOptions.cs

@@ -1,4 +1,9 @@
-using Volo.Abp.MultiTenancy;
+using System;
+using System.Globalization;
+using System.Net;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+using Volo.Abp.MultiTenancy;
 
 namespace Volo.Abp.AspNetCore.MultiTenancy
 {
@@ -9,9 +14,26 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
         /// </summary>
         public string TenantKey { get; set; }
 
+        public Func<HttpContext, Exception, Task> MultiTenancyMiddlewareErrorPageBuilder { get; set; }
+
         public AbpAspNetCoreMultiTenancyOptions()
         {
             TenantKey = TenantResolverConsts.DefaultTenantKey;
+            MultiTenancyMiddlewareErrorPageBuilder = async (context, exception)=>
+            {
+                context.Response.StatusCode = (int) HttpStatusCode.InternalServerError;;
+                context.Response.ContentType = "text/html";
+
+                var message = exception.Message;
+                var details = exception is BusinessException businessException ? businessException.Details : string.Empty;
+
+                await context.Response.WriteAsync($"<html lang=\"{CultureInfo.CurrentCulture.Name}\"><body>\r\n");
+                await context.Response.WriteAsync($"<h3>{message}</h3>{details}<br>\r\n");
+                await context.Response.WriteAsync("</body></html>\r\n");
+
+                // Note the 500 spaces are to work around an IE 'feature'
+                await context.Response.WriteAsync(new string(' ', 500));
+            };
         }
     }
-}
+}

framework/src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/MultiTenancyMiddleware.cs

@@ -1,10 +1,14 @@
 using System;
 using System.Globalization;
+using System.IO;
+using System.Net;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Localization;
 using Microsoft.AspNetCore.RequestLocalization;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
 using Volo.Abp.DependencyInjection;
 using Volo.Abp.Localization;
 using Volo.Abp.MultiTenancy;
@@ -16,18 +20,31 @@ namespace Volo.Abp.AspNetCore.MultiTenancy
     {
         private readonly ITenantConfigurationProvider _tenantConfigurationProvider;
         private readonly ICurrentTenant _currentTenant;
+        private readonly AbpAspNetCoreMultiTenancyOptions _options;
 
         public MultiTenancyMiddleware(
             ITenantConfigurationProvider tenantConfigurationProvider,
-            ICurrentTenant currentTenant)
+            ICurrentTenant currentTenant,
+            IOptions<AbpAspNetCoreMultiTenancyOptions> options)
         {
             _tenantConfigurationProvider = tenantConfigurationProvider;
             _currentTenant = currentTenant;
+            _options = options.Value;
         }
 
         public async Task InvokeAsync(HttpContext context, RequestDelegate next)
         {
-            var tenant = await _tenantConfigurationProvider.GetAsync(saveResolveResult: true);
+            TenantConfiguration tenant;
+            try
+            {
+                tenant = await _tenantConfigurationProvider.GetAsync(saveResolveResult: true);
+            }
+            catch (Exception e)
+            {
+                await _options.MultiTenancyMiddlewareErrorPageBuilder(context, e);
+                return;
+            }
+
             if (tenant?.Id != _currentTenant.Id)
             {
                 using (_currentTenant.Change(tenant?.Id, tenant?.Name))

modules/identity/src/Volo.Abp.Identity.AspNetCore/Volo/Abp/Identity/AspNetCore/AbpSecurityStampValidator.cs

@@ -1,4 +1,5 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Identity;
@@ -34,7 +35,16 @@ namespace Volo.Abp.Identity.AspNetCore
         [UnitOfWork]
         public override async Task ValidateAsync(CookieValidatePrincipalContext context)
         {
-            var tenant = await TenantConfigurationProvider.GetAsync(saveResolveResult: false);
+            TenantConfiguration tenant = null;
+            try
+            {
+                tenant = await TenantConfigurationProvider.GetAsync(saveResolveResult: false);
+            }
+            catch (Exception e)
+            {
+                Logger.LogException(e);
+            }
+
             using (CurrentTenant.Change(tenant?.Id, tenant?.Name))
             {
                 await base.ValidateAsync(context);