Add option to enable VS Telemetry on UsageTracker

Make GitHubPackage responsible for enabling VS Telemetry on VS 2017 and
above.

src/GitHub.VisualStudio.16/CompositionServices.cs

@@ -82,7 +82,7 @@ namespace GitHub.VisualStudio
                 var gitHubServiceProvider = compositionContainer.GetExportedValue<IGitHubServiceProvider>();
                 var usageService = compositionContainer.GetExportedValue<IUsageService>();
                 var joinableTaskContext = compositionContainer.GetExportedValue<JoinableTaskContext>();
-                return new UsageTracker(gitHubServiceProvider, usageService, packageSettings, joinableTaskContext);
+                return new UsageTracker(gitHubServiceProvider, usageService, packageSettings, joinableTaskContext, vsTelemetry: true);
             }
         }
 

src/GitHub.VisualStudio/GitHubPackage.cs

@@ -393,7 +393,13 @@ namespace GitHub.VisualStudio
                 Assumes.Present(serviceProvider);
                 Assumes.Present(settings);
 
-                return new UsageTracker(serviceProvider, usageService, settings, ThreadHelper.JoinableTaskContext);
+                // Only use Visual Studio Telemetry on VS 2017 and above
+                await JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);
+                var dte = await GetServiceAsync(typeof(EnvDTE.DTE)) as EnvDTE.DTE;
+                Assumes.Present(dte);
+                var vsTelemetry = new Version(dte.Version) >= new Version(15, 0);
+
+                return new UsageTracker(serviceProvider, usageService, settings, ThreadHelper.JoinableTaskContext, vsTelemetry);
             }
             else if (serviceType == typeof(IVSGitExt))
             {

src/GitHub.VisualStudio/Services/UsageTracker.cs

@@ -23,6 +23,7 @@ namespace GitHub.Services
         readonly IUsageService service;
         IConnectionManager connectionManager;
         readonly IPackageSettings userSettings;
+        readonly bool vsTelemetry;
         IVSServices vsservices;
         IUsageTracker visualStudioUsageTracker;
         IDisposable timer;
@@ -32,12 +33,15 @@ namespace GitHub.Services
             IGitHubServiceProvider gitHubServiceProvider,
             IUsageService service,
             IPackageSettings settings,
-            JoinableTaskContext joinableTaskContext)
+            JoinableTaskContext joinableTaskContext,
+            bool vsTelemetry)
         {
             this.gitHubServiceProvider = gitHubServiceProvider;
             this.service = service;
             this.userSettings = settings;
             JoinableTaskContext = joinableTaskContext;
+            this.vsTelemetry = vsTelemetry;
+
             timer = StartTimer();
         }
 
@@ -101,9 +105,7 @@ namespace GitHub.Services
             connectionManager = gitHubServiceProvider.GetService<IConnectionManager>();
             vsservices = gitHubServiceProvider.GetService<IVSServices>();
 
-            // Only create VisualStudioUsageTracker on Visual Studio 2017 and above
-            var dte = gitHubServiceProvider.GetService<EnvDTE.DTE>();
-            if (new Version(dte.Version) >= new Version(15, 0))
+            if (vsTelemetry)
             {
                 log.Verbose("Creating VisualStudioUsageTracker");
                 visualStudioUsageTracker = new VisualStudioUsageTracker(connectionManager);

test/GitHub.VisualStudio.UnitTests/Services/MetricsTests.cs

@@ -24,7 +24,7 @@ namespace MetricsTests
         public void ShouldStartTimer()
         {
             var service = Substitute.For<IUsageService>();
-            var target = new UsageTracker(CreateServiceProvider(), service, CreatePackageSettings(), new JoinableTaskContext());
+            var target = new UsageTracker(CreateServiceProvider(), service, CreatePackageSettings(), new JoinableTaskContext(), vsTelemetry: false);
 
             service.Received(1).StartTimer(Arg.Any<Func<Task>>(), TimeSpan.FromMinutes(3), TimeSpan.FromDays(1));
         }
@@ -111,7 +111,8 @@ namespace MetricsTests
                 CreateServiceProvider(),
                 usageService,
                 CreatePackageSettings(),
-                new JoinableTaskContext());
+                new JoinableTaskContext(),
+                vsTelemetry: false);
 
             await target.IncrementCounter(x => x.NumberOfClones);
             UsageData result = usageService.ReceivedCalls().First(x => x.GetMethodInfo().Name == "WriteLocalData").GetArguments()[0] as UsageData;
@@ -128,7 +129,8 @@ namespace MetricsTests
                 CreateServiceProvider(),
                 service,
                 CreatePackageSettings(),
-                new JoinableTaskContext());
+                new JoinableTaskContext(),
+                vsTelemetry: false);
 
             await target.IncrementCounter(x => x.NumberOfClones);
             await service.Received(1).WriteLocalData(Arg.Is<UsageData>(data => 
@@ -155,7 +157,8 @@ namespace MetricsTests
                 CreateServiceProvider(),
                 service,
                 CreatePackageSettings(),
-                new JoinableTaskContext());
+                new JoinableTaskContext(),
+                vsTelemetry: false);
 
             await target.IncrementCounter(x => x.NumberOfClones);
             await service.Received(1).WriteLocalData(Arg.Is<UsageData>(data =>
@@ -177,7 +180,7 @@ namespace MetricsTests
             service.WhenForAnyArgs(x => x.StartTimer(null, new TimeSpan(), new TimeSpan()))
                 .Do(x => tick = x.ArgAt<Func<Task>>(0));
 
-            var target = new UsageTracker(serviceProvider, service, CreatePackageSettings(), new JoinableTaskContext());
+            var target = new UsageTracker(serviceProvider, service, CreatePackageSettings(), new JoinableTaskContext(), vsTelemetry: false);
 
             return Tuple.Create(target, tick);
         }