V4: Increase extension bundle download timeout (#3185)

* Increase extension bundle download timeout

* - Increased time to 10 mins

- Moved the call in the condition in TemplatesManager.

src/Azure.Functions.Cli/Actions/HostActions/StartHostAction.cs

@@ -8,6 +8,7 @@
 using System.Threading.Tasks;
 using Azure.Functions.Cli.Common;
 using Azure.Functions.Cli.Diagnostics;
+using Azure.Functions.Cli.ExtensionBundle;
 using Azure.Functions.Cli.Extensions;
 using Azure.Functions.Cli.Helpers;
 using Azure.Functions.Cli.Interfaces;
@@ -369,9 +370,9 @@ public override async Task RunAsync()
 
             (var listenUri, var baseUri, var certificate) = await Setup();
 
+            await ExtensionBundleHelper.GetExtensionBundle();
             IWebHost host = await BuildWebHost(hostOptions, listenUri, baseUri, certificate);
             var runTask = host.RunAsync();
-
             var hostService = host.Services.GetRequiredService<WebJobsScriptHostService>();
 
             await hostService.DelayUntilHostReady();

src/Azure.Functions.Cli/Common/TemplatesManager.cs

@@ -36,6 +36,7 @@ private static async Task<IEnumerable<Template>> GetTemplates()
 
             if(extensionBundleManager.IsExtensionBundleConfigured())
             {
+                await ExtensionBundleHelper.GetExtensionBundle();
                 var contentProvider = ExtensionBundleHelper.GetExtensionBundleContentProvider();
                 templatesJson = await contentProvider.GetTemplates();
             }

src/Azure.Functions.Cli/ExtensionBundle/ExtensionBundleHelper.cs

@@ -7,6 +7,8 @@
 using Microsoft.Extensions.Logging.Abstractions;
 using System;
 using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
 
 namespace Azure.Functions.Cli.ExtensionBundle
 {
@@ -42,5 +44,24 @@ public static string GetBundleDownloadPath(string bundleId)
         {
             return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), Constants.UserCoreToolsDirectory, "Functions", ScriptConstants.ExtensionBundleDirectory, bundleId);
         }
+
+        public static async Task GetExtensionBundle()
+        {
+            var extensionBundleManager = GetExtensionBundleManager();
+            try
+            {
+                using (var httpClient = new HttpClient())
+                {
+                    httpClient.Timeout = TimeSpan.FromMinutes(10);
+                    await extensionBundleManager.GetExtensionBundlePath(httpClient);
+                }
+            }
+            catch (Exception)
+            {
+                // Don't do anything here.
+                // There will be another attempt by the host to download the Extension Bundle.
+                // If Extension Bundle download fails again in the host then the host will return the appropriate customer facing error. 
+            }
+        }
     }
 }