Work in progress to implement multiple connections to RabbitMQ with one virtual host per tenant in the application. Each tenant specific microservice would then only be given the credentials for their own channel, while the baseline product would have to create connections to all the different virtual hosts in RabbitMQ, and also have awareness of which connection should be used for publishing an event.

src/BuildingBlocks/EventBus/EventBusRabbitMQ/IMultiRabbitMQPersistentConnections.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+
+namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ
+{
+    public interface IMultiRabbitMQPersistentConnections
+    {
+        List<IRabbitMQPersistentConnection> GetConnections();
+        void AddConnection(IRabbitMQPersistentConnection connection);
+        void RemoveConnection(IRabbitMQPersistentConnection connection);
+    }
+}

src/BuildingBlocks/EventBus/EventBusRabbitMQ/MultiRabbitMQPersistentConnections.cs

@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+
+namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ
+{
+    public class MultiRabbitMQPersistentConnections : IMultiRabbitMQPersistentConnections
+    {
+        public List<IRabbitMQPersistentConnection> Connections;
+
+        public MultiRabbitMQPersistentConnections()
+        {
+            Connections = new List<IRabbitMQPersistentConnection>();
+        }
+
+
+        public List<IRabbitMQPersistentConnection> GetConnections()
+        {
+            return Connections;
+        }
+
+        public void AddConnection(IRabbitMQPersistentConnection connection)
+        {
+            Connections.Add((connection));
+        }
+
+        public void RemoveConnection(IRabbitMQPersistentConnection connection)
+        {
+            Connections.Remove(connection);
+        }
+    }
+}

src/Services/Basket/Basket.API/Startup.cs

@@ -120,14 +120,31 @@ namespace Microsoft.eShopOnContainers.Services.Basket.API
                         factory.Password = Configuration["EventBusPassword"];
                     }
 
+                    factory.VirtualHost = "customisation";
+
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
                     {
                         retryCount = int.Parse(Configuration["EventBusRetryCount"]);
                     }
 
+
+                    
+                    
                     return new DefaultRabbitMQPersistentConnection(factory, logger, retryCount);
+
+                });
+
+                services.AddSingleton<IMultiRabbitMQPersistentConnections>(sp =>
+                {
+                    IMultiRabbitMQPersistentConnections connections = new MultiRabbitMQPersistentConnections();
+                    connections.AddConnection(GenerateConnection("customisation", sp));
+                    connections.AddConnection(GenerateConnection("/", sp));
+
+                    return connections;
                 });
+
+
             }
 
             RegisterEventBus(services);
@@ -178,7 +195,39 @@ namespace Microsoft.eShopOnContainers.Services.Basket.API
 
             return new AutofacServiceProvider(container.Build());
         }
-    
+
+
+        private IRabbitMQPersistentConnection GenerateConnection(String vHost, IServiceProvider sp)
+        {
+            var logger = sp.GetRequiredService<ILogger<DefaultRabbitMQPersistentConnection>>();
+
+            var factory = new ConnectionFactory()
+            {
+                HostName = Configuration["EventBusConnection"],
+                DispatchConsumersAsync = true
+            };
+
+            if (!string.IsNullOrEmpty(Configuration["EventBusUserName"]))
+            {
+                factory.UserName = Configuration["EventBusUserName"];
+            }
+
+            if (!string.IsNullOrEmpty(Configuration["EventBusPassword"]))
+            {
+                factory.Password = Configuration["EventBusPassword"];
+            }
+
+            factory.VirtualHost = vHost;
+
+            var retryCount = 5;
+            if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
+            {
+                retryCount = int.Parse(Configuration["EventBusRetryCount"]);
+            }
+            
+            return new DefaultRabbitMQPersistentConnection(factory, logger, retryCount);
+
+        }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
         public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
@@ -302,8 +351,20 @@ namespace Microsoft.eShopOnContainers.Services.Basket.API
                         retryCount = int.Parse(Configuration["EventBusRetryCount"]);
                     }
 
+
+                    var multiRabbitMqPersistentConnections = sp.GetRequiredService<IMultiRabbitMQPersistentConnections>();
+                    List<IEventBus> testing = new List<IEventBus>();
+                    
+                    multiRabbitMqPersistentConnections.GetConnections().ForEach(conn =>
+                    {
+                        testing.Add(new EventBusRabbitMQ(conn, logger, iLifetimeScope, eventBusSubcriptionsManager, subscriptionClientName, retryCount));
+                    });
+                    
+                    Console.WriteLine(testing);
+
                     return new EventBusRabbitMQ(rabbitMQPersistentConnection, logger, iLifetimeScope, eventBusSubcriptionsManager, subscriptionClientName, retryCount);
                 });
+                
             }
 
             services.AddSingleton<IEventBusSubscriptionsManager, InMemoryEventBusSubscriptionsManager>();

src/Services/Catalog/Catalog.API/Startup.cs

@@ -310,6 +310,8 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API
                     {
                         factory.Password = configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(configuration["EventBusRetryCount"]))

src/Services/Location/Locations.API/Startup.cs

@@ -90,6 +90,8 @@ namespace Microsoft.eShopOnContainers.Services.Locations.API
                     {
                         factory.Password = Configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))

src/Services/Marketing/Marketing.API/Startup.cs

@@ -115,6 +115,8 @@
                         factory.Password = Configuration["EventBusPassword"];
                     }
 
+                    factory.VirtualHost = "customisation";
+
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))
                     {

src/Services/Ordering/Ordering.API/Startup.cs

@@ -318,6 +318,9 @@
                     {
                         factory.Password = configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
+
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(configuration["EventBusRetryCount"]))

src/Services/Ordering/Ordering.BackgroundTasks/Startup.cs

@@ -81,6 +81,8 @@ namespace Ordering.BackgroundTasks
                     {
                         factory.Password = Configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))

src/Services/Ordering/Ordering.SignalrHub/Startup.cs

@@ -93,6 +93,8 @@ namespace Ordering.SignalrHub
                     {
                         factory.Password = Configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))

src/Services/Payment/Payment.API/Startup.cs

@@ -71,6 +71,8 @@ namespace Payment.API
                     {
                         factory.Password = Configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(Configuration["EventBusRetryCount"]))

src/Services/TenantCustomisations/TenantACustomisations/Startup.cs

@@ -311,6 +311,8 @@
                         factory.Password = configuration["EventBusPassword"];
                     }
 
+                    factory.VirtualHost = "customisation";
+
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(configuration["EventBusRetryCount"]))
                     {

src/Services/Webhooks/Webhooks.API/Startup.cs

@@ -335,6 +335,8 @@ namespace Webhooks.API
                     {
                         factory.Password = configuration["EventBusPassword"];
                     }
+                    
+                    factory.VirtualHost = "customisation";
 
                     var retryCount = 5;
                     if (!string.IsNullOrEmpty(configuration["EventBusRetryCount"]))