Add basic first implementation of Event bus with rabbitMQ

docker-compose.yml

@@ -9,6 +9,7 @@ services:
     depends_on:
       - basket.data
       - identity.api
+      - rabbitmq
 
   catalog.api:
     image: eshop/catalog.api
@@ -17,6 +18,7 @@ services:
       dockerfile: Dockerfile
     depends_on:
       - sql.data
+      - rabbitmq
 
   identity.api:
     image: eshop/identity.api

eShopOnContainers-ServicesAndWebApps.sln

@@ -48,6 +48,10 @@ Project("{E53339B2-1760-4266-BCC7-CA923CBCF16C}") = "docker-compose", "docker-co
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WebSPA", "src\Web\WebSPA\WebSPA.csproj", "{F16E3C6A-1C94-4EAB-BE91-099618060B68}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Common", "Common", "{47857844-D05A-4C37-BFB2-AF19B7EC418D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Infrastructure", "src\Services\Common\Infrastructure\Infrastructure.csproj", "{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Ad-Hoc|Any CPU = Ad-Hoc|Any CPU
@@ -494,6 +498,54 @@ Global
 		{F16E3C6A-1C94-4EAB-BE91-099618060B68}.Release|x64.Build.0 = Release|Any CPU
 		{F16E3C6A-1C94-4EAB-BE91-099618060B68}.Release|x86.ActiveCfg = Release|Any CPU
 		{F16E3C6A-1C94-4EAB-BE91-099618060B68}.Release|x86.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|Any CPU.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|Any CPU.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|ARM.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|ARM.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|iPhone.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|iPhone.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|x64.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|x64.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|x86.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Ad-Hoc|x86.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|Any CPU.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|Any CPU.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|ARM.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|ARM.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|iPhone.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|iPhone.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|x64.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|x64.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|x86.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.AppStore|x86.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|ARM.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|x64.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Debug|x86.Build.0 = Debug|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|ARM.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|ARM.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|iPhone.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|iPhone.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|x64.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|x64.Build.0 = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|x86.ActiveCfg = Release|Any CPU
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -516,5 +568,7 @@ Global
 		{7796F5D8-31FC-45A4-B673-19DE5BA194CF} = {EF0337F2-ED00-4643-89FD-EE10863F1870}
 		{A579E108-5445-403D-A407-339AC4D1611B} = {24CD3B53-141E-4A07-9B0D-796641E1CF78}
 		{F16E3C6A-1C94-4EAB-BE91-099618060B68} = {E279BF0F-7F66-4F3A-A3AB-2CDA66C1CD04}
+		{47857844-D05A-4C37-BFB2-AF19B7EC418D} = {91CF7717-08AB-4E65-B10E-0B426F01E2E8}
+		{B08BA891-ABA2-4BD5-80E8-40B7546C3BE0} = {47857844-D05A-4C37-BFB2-AF19B7EC418D}
 	EndGlobalSection
 EndGlobal

src/Services/Catalog/Catalog.API/Catalog.API.csproj

@@ -52,6 +52,10 @@
     <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="1.0.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\..\Common\Infrastructure\Infrastructure.csproj" />
+  </ItemGroup>
+
   <ItemGroup>
     <None Update="Dockerfile">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>

src/Services/Catalog/Catalog.API/Controllers/CatalogController.cs

@@ -3,6 +3,8 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.eShopOnContainers.Services.Catalog.API.Infrastructure;
 using Microsoft.eShopOnContainers.Services.Catalog.API.Model;
 using Microsoft.eShopOnContainers.Services.Catalog.API.ViewModel;
+using Microsoft.eShopOnContainers.Services.Common.Infrastructure;
+using Microsoft.eShopOnContainers.Services.Common.Infrastructure.Catalog;
 using Microsoft.Extensions.Options;
 using System.Collections.Generic;
 using System.Linq;
@@ -15,11 +17,13 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API.Controllers
     {
         private readonly CatalogContext _context;
         private readonly IOptionsSnapshot<Settings> _settings;
+        private readonly IEventBus _eventBus;
 
-        public CatalogController(CatalogContext context, IOptionsSnapshot<Settings> settings)
+        public CatalogController(CatalogContext context, IOptionsSnapshot<Settings> settings, IEventBus eventBus)
         {
             _context = context;
             _settings = settings;
+            _eventBus = eventBus;
 
             ((DbContext)context).ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;
         }
@@ -41,7 +45,7 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API.Controllers
             itemsOnPage = ComposePicUri(itemsOnPage);
 
             var model = new PaginatedItemsViewModel<CatalogItem>(
-                pageIndex, pageSize, totalItems, itemsOnPage);
+                pageIndex, pageSize, totalItems, itemsOnPage);           
 
             return Ok(model);
         }
@@ -99,7 +103,13 @@ namespace Microsoft.eShopOnContainers.Services.Catalog.API.Controllers
 
             var model = new PaginatedItemsViewModel<CatalogItem>(
                 pageIndex, pageSize, totalItems, itemsOnPage);
-            
+
+            //hook to run integration tests until POST methods are created
+            if (catalogTypeId.HasValue && catalogTypeId == 1)
+            {
+                _eventBus.Publish(new CatalogPriceChanged());
+            }
+
             return Ok(model);
         }
 

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

@@ -7,6 +7,7 @@
     using Microsoft.EntityFrameworkCore;
     using Microsoft.EntityFrameworkCore.Infrastructure;
     using Microsoft.eShopOnContainers.Services.Catalog.API.Infrastructure;
+    using Microsoft.eShopOnContainers.Services.Common.Infrastructure;
     using Microsoft.Extensions.Configuration;
     using Microsoft.Extensions.DependencyInjection;
     using Microsoft.Extensions.Logging;
@@ -73,6 +74,8 @@
                     .AllowCredentials());
             });
 
+            services.AddSingleton<IEventBus, EventBus>();
+            
             services.AddMvc();
         }
 

src/Services/Common/Infrastructure/Catalog/CatalogPriceChanged.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure.Catalog
+{
+    public class CatalogPriceChanged : IIntegrationEvent
+    {
+        private readonly string _eventName = "catalogpricechanged";
+
+        public string Name {
+            get
+            {
+                return _eventName;
+            }
+        }
+
+        public string Message { get { return "CatalogPriceChanged!!"; } }
+    }
+}

src/Services/Common/Infrastructure/Catalog/CatalogPriceChangedHandler.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure.Catalog
+{
+    public class CatalogPriceChangedHandler : IIntegrationEventHandler<CatalogPriceChanged>
+    {
+        public void Handle(CatalogPriceChanged @event)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

src/Services/Common/Infrastructure/EventBus.cs

@@ -0,0 +1,101 @@
+
+using Microsoft.eShopOnContainers.Services.Common.Infrastructure.Catalog;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure
+{
+    public class EventBus : IEventBus
+    {
+        private readonly Dictionary<string, List<IIntegrationEventHandler>>  _handlers;        
+        private readonly Dictionary<string, Tuple<IModel, IConnection>> _listeners;
+
+        public EventBus()
+        {
+            _handlers = new Dictionary<string, List<IIntegrationEventHandler>>();
+            _listeners = new Dictionary<string, Tuple<IModel, IConnection>>();
+        }
+        public void Publish(IIntegrationEvent @event)
+        {
+            var factory = new ConnectionFactory() { HostName = "172.20.0.1" };
+            using (var connection = factory.CreateConnection())
+            using (var channel = connection.CreateModel())
+            {                
+                channel.QueueDeclare(queue: @event.Name,
+                                     durable: false,
+                                     exclusive: false,
+                                     autoDelete: false,
+                                     arguments: null);
+
+                string message = ((CatalogPriceChanged)@event).Message;                
+                var body = Encoding.UTF8.GetBytes(message);
+
+                channel.BasicPublish(exchange: "",
+                                     routingKey: @event.Name,
+                                     basicProperties: null,
+                                     body: body);                
+            }
+            
+        }
+
+        public void Subscribe<T>(IIntegrationEventHandler<T> handler) where T : IIntegrationEvent
+        {
+            var eventName = typeof(T).Name;
+            if (_handlers.ContainsKey(eventName))   
+            {
+                _handlers[eventName].Add(handler);
+            }
+            else
+            {
+                var factory = new ConnectionFactory() { HostName = "172.18.0.1" };
+                var connection = factory.CreateConnection();
+                var channel = connection.CreateModel();
+                
+                channel.QueueDeclare(queue: eventName,
+                                     durable: false,
+                                     exclusive: false,
+                                     autoDelete: false,
+                                     arguments: null);
+
+                var consumer = new EventingBasicConsumer(channel);
+                consumer.Received += (model, ea) =>
+                {
+                    var body = ea.Body;
+                    var message = Encoding.UTF8.GetString(body);                    
+                };
+                channel.BasicConsume(queue: "hello",
+                                     noAck: true,
+                                     consumer: consumer);
+                ;
+
+                _listeners.Add(eventName, new Tuple<IModel, IConnection>(channel, connection));
+                _handlers.Add(eventName, new List<IIntegrationEventHandler>());
+                _handlers[eventName].Add(handler);
+            }
+            
+        }
+
+        public void Unsubscribe<T>(IIntegrationEventHandler<T> handler) where T : IIntegrationEvent
+        {
+            var eventName = typeof(T).Name;
+            if (_handlers.ContainsKey(eventName) && _handlers[eventName].Contains(handler))
+            {
+                _handlers[eventName].Remove(handler);
+
+                if (_handlers[eventName].Count == 0)
+                {
+                    _handlers.Remove(eventName);
+
+                    var connectionItems =_listeners[eventName];
+                    _listeners.Remove(eventName);
+
+                    connectionItems.Item1.Close();
+                    connectionItems.Item2.Close();
+                }
+            }
+        }
+    }
+}

src/Services/Common/Infrastructure/IEventBus.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure
+{
+    public interface IEventBus
+    {
+        void Subscribe<T>(IIntegrationEventHandler<T> handler) where T: IIntegrationEvent;
+        void Unsubscribe<T>(IIntegrationEventHandler<T> handler) where T : IIntegrationEvent;
+        void Publish(IIntegrationEvent @event);
+    }
+}

src/Services/Common/Infrastructure/IIntegrationEvent.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure
+{
+    public interface IIntegrationEvent
+    {
+        string Name { get; }
+    }
+}

src/Services/Common/Infrastructure/IIntegrationEventHandler.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Microsoft.eShopOnContainers.Services.Common.Infrastructure
+{
+    public interface IIntegrationEventHandler<in TIntegrationEvent> : IIntegrationEventHandler 
+        where TIntegrationEvent: IIntegrationEvent
+    {
+        void Handle(TIntegrationEvent @event);
+    }
+
+    public interface IIntegrationEventHandler { }
+}

src/Services/Common/Infrastructure/Infrastructure.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp1.1</TargetFramework>
+    <RuntimeFrameworkVersion>1.1.0</RuntimeFrameworkVersion>
+    <RootNamespace>Microsoft.eShopOnContainers.Services.Common.Infrastructure</RootNamespace>    
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="RabbitMQ.Client" Version="4.1.1" />
+  </ItemGroup>
+</Project>