automated framework update enhancement

Oqtane.Upgrade/Oqtane.Upgrade.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
+    <OutputPath>..\Oqtane.Server\bin\Release\</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <OutputPath>..\Oqtane.Server\bin\Debug\</OutputPath>
+  </PropertyGroup>
+
+</Project>

Oqtane.Upgrade/Program.cs

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+using System.IO;
+using System.Reflection;
+using System.Threading;
+
+namespace Oqtane.Upgrade
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string binfolder = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
+            // assumes that the application executable must be deployed to the /bin of the Oqtane.Server project
+            if (binfolder.Contains("Oqtane.Server\\bin"))
+            {
+                // ie. Oqtane.Server\bin\Debug\netcoreapp3.0\Oqtane.Upgrade.exe
+                string rootfolder = Directory.GetParent(binfolder).Parent.Parent.FullName;
+                string deployfolder = Path.Combine(rootfolder, "wwwroot\\Framework");
+
+                // take the app offline
+                if (File.Exists(Path.Combine(rootfolder, "app_offline.bak")))
+                {
+                    File.Move(Path.Combine(rootfolder, "app_offline.bak"), Path.Combine(rootfolder, "app_offline.htm"));
+                }
+
+                if (Directory.Exists(deployfolder))
+                {
+                    string filename;
+                    string[] files = Directory.GetFiles(deployfolder);
+                    if (CanAccessFiles(files, binfolder))
+                    {
+                        // backup the files 
+                        foreach (string file in files)
+                        {
+                            filename = Path.Combine(binfolder, Path.GetFileName(file));
+                            if (File.Exists(filename))
+                            {
+                                File.Move(filename, filename.Replace(".dll", ".bak"));
+                            }
+                        }
+
+                        // copy the new files
+                        bool success = true;
+                        try
+                        {
+                            foreach (string file in files)
+                            {
+                                filename = Path.Combine(binfolder, Path.GetFileName(file));
+                                // delete the file from the /bin if it exists
+                                if (File.Exists(filename))
+                                {
+                                    File.Delete(filename);
+                                }
+                                // copy the new file to the /bin
+                                File.Move(Path.Combine(deployfolder, Path.GetFileName(file)), filename);
+                            }
+                        }
+                        catch
+                        {
+                            // an error occurred deleting or moving a file
+                            success = false;
+                        }
+
+                        // restore on failure
+                        if (!success)
+                        {
+                            foreach (string file in files)
+                            {
+                                filename = Path.Combine(binfolder, Path.GetFileName(file));
+                                if (File.Exists(filename))
+                                {
+                                    File.Move(filename, filename.Replace(".bak", ".dll"));
+                                }
+                            }
+                        }
+                    }
+                }
+
+                // bring the app back online
+                if (File.Exists(Path.Combine(rootfolder, "app_offline.htm")))
+                {
+                    File.Move(Path.Combine(rootfolder, "app_offline.htm"), Path.Combine(rootfolder, "app_offline.bak"));
+                }
+            }
+ 
+            return;
+        }
+
+        private static bool CanAccessFiles(string[] files, string folder)
+        {
+            // ensure files are not locked by another process - the shutdownTimeLimit defines the duration for app shutdown
+            bool canaccess = true;
+            FileStream stream = null;
+            int i = 0;
+            while (i < (files.Length - 1) && canaccess)
+            {
+                string filepath = Path.Combine(folder, Path.GetFileName(files[i]));
+                int attempts = 0;
+                bool locked = true;
+                // try up to 30 times
+                while (attempts < 30 && locked == true)
+                {
+                    try
+                    {
+                        stream = System.IO.File.Open(filepath, FileMode.Open, FileAccess.Read, FileShare.None);
+                        locked = false;
+                    }
+                    catch // file is locked by another process
+                    {
+                        Thread.Sleep(1000); // wait 1 second
+                    }
+                    finally
+                    {
+                        if (stream != null)
+                        {
+                            stream.Close();
+                        }
+                    }
+                    attempts += 1;
+                }
+                if (locked && canaccess)
+                {
+                    canaccess = false;
+                }
+                i += 1;
+            }
+            return canaccess;
+        }
+    }
+}