Make QuickPulse configurable by adding it to DI like all other modules

CHANGELOG.md

@@ -12,6 +12,7 @@
 - [Added ability to remove any default Telemetry Module.](https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/633)
 - [TelemetryChannel is configured via DI, making it easier to override channel](https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/641)
 - [Fixed a bug which caused QuickPulse and Sampling to be enabled only if ServerTelemetryChannel was used](https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/642)
+- [QuickPulseTelemetryModule is constructed via DI, make it possible for users to configure it.] (https://github.com/Microsoft/ApplicationInsights-aspnetcore/issues/639)
 
 ## Version 2.2.1
 - Updated Web/Base SDK version dependency to 2.5.1 which addresses a bug.

src/Microsoft.ApplicationInsights.AspNetCore/Extensibility/Implementation/Tracing/AspNetEventSource.cs

@@ -140,6 +140,12 @@ public void UnableToFindModuleToConfigure(string moduleType, string appDomainNam
             this.WriteEvent(11, moduleType, this.ApplicationName);
         }
 
+        [Event(12, Message = "Unable to find QuickPulseTelemetryModule in service collection. LiveMetrics feature will not be available. Please add QuickPulseTelemetryModule to services collection in the ConfigureServices method of your application Startup class.", Level = EventLevel.Error, Keywords = Keywords.Diagnostics)]
+        public void UnableToFindQuickPulseModuleInDI(string appDomainName = "Incorrect")
+        {
+            this.WriteEvent(12, this.ApplicationName);
+        }
+
         /// <summary>
         /// Keywords for the AspNetEventSource.
         /// </summary>

src/Microsoft.ApplicationInsights.AspNetCore/Extensions/ApplicationInsightsExtensions.cs

@@ -15,6 +15,7 @@ namespace Microsoft.Extensions.DependencyInjection
     using Microsoft.ApplicationInsights.Channel;
     using Microsoft.ApplicationInsights.DependencyCollector;
     using Microsoft.ApplicationInsights.Extensibility;
+    using Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse;
     using Microsoft.ApplicationInsights.WindowsServer;    
     using Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel;
     using Microsoft.AspNetCore.Hosting;
@@ -164,6 +165,7 @@ public static IServiceCollection AddApplicationInsightsTelemetry(this IServiceCo
 #endif
                 services.AddSingleton<ITelemetryModule, AppServicesHeartbeatTelemetryModule>();
                 services.AddSingleton<ITelemetryModule, AzureInstanceMetadataTelemetryModule>();
+                services.AddSingleton<ITelemetryModule, QuickPulseTelemetryModule>();
                 services.AddSingleton<TelemetryConfiguration>(provider => provider.GetService<IOptions<TelemetryConfiguration>>().Value);
 
                 services.AddSingleton<ICorrelationIdLookupHelper>(provider => new CorrelationIdLookupHelper(() => provider.GetService<IOptions<TelemetryConfiguration>>().Value));

src/Microsoft.ApplicationInsights.AspNetCore/Implementation/TelemetryConfigurationOptionsSetup.cs

@@ -75,20 +75,18 @@ public void Configure(TelemetryConfiguration configuration)
                 foreach (ITelemetryProcessorFactory processorFactory in this.telemetryProcessorFactories)
                 {
                     configuration.TelemetryProcessorChainBuilder.Use(processorFactory.Create);
-                }
-                configuration.TelemetryProcessorChainBuilder.Build();
+                }                
             }
 
+            // Fallback to default channel (InMemoryChannel) created by base sdk if no channel is found in DI
+            configuration.TelemetryChannel = this.telemetryChannel ?? configuration.TelemetryChannel;
+            (configuration.TelemetryChannel as ITelemetryModule)?.Initialize(configuration);
+
             this.AddQuickPulse(configuration);
             this.AddSampling(configuration);
             this.DisableHeartBeatIfConfigured();
-
-            (configuration.TelemetryChannel as ITelemetryModule)?.Initialize(configuration);
-
-            configuration.TelemetryProcessorChainBuilder.Build();
-
-            // Fallback to default channel (InMemoryChannel) created by base sdk if no channel is found in DI
-            configuration.TelemetryChannel = this.telemetryChannel ?? configuration.TelemetryChannel;
+
+            configuration.TelemetryProcessorChainBuilder.Build();            
 
             if (this.applicationInsightsServiceOptions.DeveloperMode != null)
             {
@@ -121,20 +119,25 @@ public void Configure(TelemetryConfiguration configuration)
         }
 
         private void AddQuickPulse(TelemetryConfiguration configuration)
-        {            
+        {
             if (this.applicationInsightsServiceOptions.EnableQuickPulseMetricStream)
-            {
-                var quickPulseModule = new QuickPulseTelemetryModule();
-                quickPulseModule.Initialize(configuration);
-
-                QuickPulseTelemetryProcessor processor = null;
-                configuration.TelemetryProcessorChainBuilder.Use((next) =>
+            {              
+                QuickPulseTelemetryModule quickPulseModule = this.modules.FirstOrDefault(((module) => module.GetType() == typeof(QuickPulseTelemetryModule))) as QuickPulseTelemetryModule;
+                if (quickPulseModule != null)
+                {                    
+                    QuickPulseTelemetryProcessor processor = null;
+                    configuration.TelemetryProcessorChainBuilder.Use((next) =>
+                    {
+                        processor = new QuickPulseTelemetryProcessor(next);
+                        quickPulseModule.RegisterTelemetryProcessor(processor);
+                        return processor;
+                    });
+                }
+                else
                 {
-                    processor = new QuickPulseTelemetryProcessor(next);
-                    quickPulseModule.RegisterTelemetryProcessor(processor);
-                    return processor;
-                });
-            }            
+                    AspNetCoreEventSource.Instance.UnableToFindQuickPulseModuleInDI();
+                }                
+            }        
         }
 
         private void AddSampling(TelemetryConfiguration configuration)

test/Microsoft.ApplicationInsights.AspNetCore.Tests/Extensions/ApplicationInsightsExtensionsTests.cs

@@ -348,15 +348,24 @@ public static void RegistersTelemetryConfigurationFactoryMethodThatPopulatesItWi
                 Assert.NotNull(modules);
 
 #if NET46
-                Assert.Equal(4, modules.Count());
+                Assert.Equal(5, modules.Count());
                 var perfCounterModule = services.FirstOrDefault<ServiceDescriptor>(t => t.ImplementationType == typeof(PerformanceCollectorModule));
                 Assert.NotNull(perfCounterModule);
 #else
-                Assert.Equal(3, modules.Count());
+                Assert.Equal(4, modules.Count());
 #endif
 
                 var dependencyModuleDescriptor = services.FirstOrDefault<ServiceDescriptor>(t => t.ImplementationType == typeof(DependencyTrackingTelemetryModule));
-                Assert.NotNull(dependencyModuleDescriptor);                
+                Assert.NotNull(dependencyModuleDescriptor);
+
+                var appServiceHeartBeatModuleDescriptor = services.FirstOrDefault<ServiceDescriptor>(t => t.ImplementationType == typeof(AppServicesHeartbeatTelemetryModule));
+                Assert.NotNull(appServiceHeartBeatModuleDescriptor);
+
+                var azureMetadataHeartBeatModuleDescriptor = services.FirstOrDefault<ServiceDescriptor>(t => t.ImplementationType == typeof(AzureInstanceMetadataTelemetryModule));
+                Assert.NotNull(azureMetadataHeartBeatModuleDescriptor);
+
+                var quickPulseModuleDescriptor = services.FirstOrDefault<ServiceDescriptor>(t => t.ImplementationType == typeof(QuickPulseTelemetryModule));
+                Assert.NotNull(quickPulseModuleDescriptor);
             }
             [Fact]
             public static void RegistersTelemetryConfigurationFactoryMethodThatPopulatesDependencyCollectorWithDefaultValues()