From 63038b7278edbef928159b8977ff4adccf731f43 Mon Sep 17 00:00:00 2001
From: Victor Hurdugaci <victor.hurdugaci@microsoft.com>
Date: Wed, 6 May 2015 09:55:47 -0700
Subject: [PATCH] Use the in memory store on the Nano server

---
 src/MusicStore/Platform.cs             | 77 ++++++++++++++++++++++++++
 src/MusicStore/Startup.cs              |  7 +--
 src/MusicStore/StartupOpenIdConnect.cs |  7 +--
 3 files changed, 83 insertions(+), 8 deletions(-)
 create mode 100644 src/MusicStore/Platform.cs

diff --git a/src/MusicStore/Platform.cs b/src/MusicStore/Platform.cs
new file mode 100644
index 0000000000..ca0f0cb32d
--- /dev/null
+++ b/src/MusicStore/Platform.cs
@@ -0,0 +1,77 @@
+using System;
+using System.Runtime.InteropServices;
+using Microsoft.Framework.Runtime;
+using Microsoft.Framework.Runtime.Infrastructure;
+
+namespace MusicStore
+{
+    internal class Platform
+    {
+        // Defined in winnt.h
+        private const int PRODUCT_NANO_SERVER = 0x0000006D;
+
+        [DllImport("api-ms-win-core-sysinfo-l1-2-1.dll", SetLastError = false)]
+        private static extern bool GetProductInfo(
+              int dwOSMajorVersion,
+              int dwOSMinorVersion,
+              int dwSpMajorVersion,
+              int dwSpMinorVersion,
+              out int pdwReturnedProductType);
+
+        private readonly IRuntimeEnvironment _runtimeEnvironment;
+
+        private bool? _isNano;
+        private bool? _isMono;
+
+        public Platform(IRuntimeEnvironment runtimeEnvironment)
+        {
+            _runtimeEnvironment = runtimeEnvironment;
+        }
+
+        public bool IsRunningOnMono
+        {
+            get
+            {
+                if (_isMono == null)
+                {
+                    _isMono = _runtimeEnvironment.RuntimeType.Equals("Mono", StringComparison.OrdinalIgnoreCase);
+                }
+
+                return _isMono.Value;
+            }
+        }
+
+        public bool IsRunningOnNanoServer
+        {
+            get
+            {
+                if (_isNano == null)
+                {
+                    var osVersion = new Version(_runtimeEnvironment.OperatingSystemVersion);
+
+                    try
+                    {
+                        int productType;
+                        if (GetProductInfo(osVersion.Major, osVersion.Minor, 0,0, out productType))
+                        {
+                            _isNano = productType == PRODUCT_NANO_SERVER;
+                        }
+                        else
+                        {
+                            _isNano = false;
+                        }
+                    }
+                    catch
+                    {
+                        // If the API call fails, the API set is not there which means 
+                        // that we are definetely not running on Nano
+                        _isNano = false;
+                    }
+                }
+
+                return _isNano.Value;
+            }
+        }
+
+    }
+}
diff --git a/src/MusicStore/Startup.cs b/src/MusicStore/Startup.cs
index c32edbd08e..051c5589d1 100644
--- a/src/MusicStore/Startup.cs
+++ b/src/MusicStore/Startup.cs
@@ -17,7 +17,7 @@ namespace MusicStore
 {
     public class Startup
     {
-        private readonly IRuntimeEnvironment _runtimeEnvironment;
+        private readonly Platform _platform;
 
         public Startup(IApplicationEnvironment env, IRuntimeEnvironment runtimeEnvironment)
         {
@@ -27,7 +27,7 @@ namespace MusicStore
                         .AddJsonFile("config.json")
                         .AddEnvironmentVariables(); //All environment variables in the process's context flow in as configuration values.
 
-            _runtimeEnvironment = runtimeEnvironment;
+            _platform = new Platform(runtimeEnvironment);
         }
 
         public IConfiguration Configuration { get; private set; }
@@ -36,8 +36,7 @@ namespace MusicStore
         {
             services.Configure<AppSettings>(Configuration.GetSubKey("AppSettings"));
 
-            //Sql client not available on mono
-            var useInMemoryStore = _runtimeEnvironment.RuntimeType.Equals("Mono", StringComparison.OrdinalIgnoreCase);
+            var useInMemoryStore = _platform.IsRunningOnMono || _platform.IsRunningOnNanoServer;
 
             // Add EF services to the services container
             if (useInMemoryStore)
diff --git a/src/MusicStore/StartupOpenIdConnect.cs b/src/MusicStore/StartupOpenIdConnect.cs
index 6c10b3f9a4..07281c7f9b 100644
--- a/src/MusicStore/StartupOpenIdConnect.cs
+++ b/src/MusicStore/StartupOpenIdConnect.cs
@@ -30,7 +30,7 @@ namespace MusicStore
     /// </summary>
     public class StartupOpenIdConnect
     {
-        private readonly IRuntimeEnvironment _runtimeEnvironment;
+        private readonly Platform _platform;
 
         public StartupOpenIdConnect(IApplicationEnvironment env, IRuntimeEnvironment runtimeEnvironment)
         {
@@ -40,7 +40,7 @@ namespace MusicStore
                         .AddJsonFile("config.json")
                         .AddEnvironmentVariables(); //All environment variables in the process's context flow in as configuration values.
 
-            _runtimeEnvironment = runtimeEnvironment;
+            _platform = new Platform(runtimeEnvironment);
         }
 
         public IConfiguration Configuration { get; private set; }
@@ -49,8 +49,7 @@ namespace MusicStore
         {
             services.Configure<AppSettings>(Configuration.GetSubKey("AppSettings"));
 
-            //Sql client not available on mono
-            var useInMemoryStore = _runtimeEnvironment.RuntimeType.Equals("Mono", StringComparison.OrdinalIgnoreCase);
+            var useInMemoryStore = _platform.IsRunningOnMono || _platform.IsRunningOnNanoServer;
 
             // Add EF services to the services container
             if (useInMemoryStore)