From cf2cfa4853944ce0af6b6c22a089b937dd59ccaf Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 14 Jun 2020 22:18:25 +0800
Subject: feat(back): Add backup service and run it when start.

---
 Timeline/Configs/ApplicationConfiguration.cs |  1 +
 Timeline/Program.cs                          |  5 ++++
 Timeline/Services/DatabaseBackupService.cs   | 35 ++++++++++++++++++++++++++++
 Timeline/Services/PathProvider.cs            |  6 +++++
 Timeline/Startup.cs                          |  2 ++
 5 files changed, 49 insertions(+)
 create mode 100644 Timeline/Services/DatabaseBackupService.cs

diff --git a/Timeline/Configs/ApplicationConfiguration.cs b/Timeline/Configs/ApplicationConfiguration.cs
index c84327d7..64ab6f6c 100644
--- a/Timeline/Configs/ApplicationConfiguration.cs
+++ b/Timeline/Configs/ApplicationConfiguration.cs
@@ -5,6 +5,7 @@
         public const string WorkDirKey = "WorkDir";
         public const string DefaultWorkDir = "/timeline";
         public const string DatabaseFileName = "timeline.db";
+        public const string DatabaseBackupDirectoryName = "backup";
         public const string DisableFrontEndKey = "DisableFrontEnd";
         public const string FrontEndProxyOnlyKey = "FrontEndProxyOnly";
         public const string UseMockFrontEndKey = "UseMockFrontEnd";
diff --git a/Timeline/Program.cs b/Timeline/Program.cs
index c49f74b0..0540fbd1 100644
--- a/Timeline/Program.cs
+++ b/Timeline/Program.cs
@@ -5,6 +5,7 @@ using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 using System.Resources;
 using Timeline.Entities;
+using Timeline.Services;
 
 [assembly: NeutralResourcesLanguage("en")]
 
@@ -17,6 +18,10 @@ namespace Timeline
             var host = CreateWebHostBuilder(args).Build();
 
             var env = host.Services.GetRequiredService<IWebHostEnvironment>();
+
+            var databaseBackupService = host.Services.GetRequiredService<IDatabaseBackupService>();
+            databaseBackupService.BackupNow();
+
             if (env.IsProduction())
             {
                 using (var scope = host.Services.CreateScope())
diff --git a/Timeline/Services/DatabaseBackupService.cs b/Timeline/Services/DatabaseBackupService.cs
new file mode 100644
index 00000000..a76b2a0d
--- /dev/null
+++ b/Timeline/Services/DatabaseBackupService.cs
@@ -0,0 +1,35 @@
+using System.Globalization;
+using System.IO;
+
+namespace Timeline.Services
+{
+    public interface IDatabaseBackupService
+    {
+        void BackupNow();
+    }
+
+    public class DatabaseBackupService : IDatabaseBackupService
+    {
+        private readonly IPathProvider _pathProvider;
+        private readonly IClock _clock;
+
+        public DatabaseBackupService(IPathProvider pathProvider, IClock clock)
+        {
+            _pathProvider = pathProvider;
+            _clock = clock;
+        }
+
+        public void BackupNow()
+        {
+            var databasePath = _pathProvider.GetDatabaseFilePath();
+            if (File.Exists(databasePath))
+            {
+                var backupDirPath = _pathProvider.GetDatabaseBackupDirectory();
+                Directory.CreateDirectory(backupDirPath);
+                var fileName = _clock.GetCurrentTime().ToString("yyyy-MM-ddTHH-mm-ss", CultureInfo.InvariantCulture);
+                var path = Path.Combine(backupDirPath, fileName);
+                File.Copy(databasePath, path);
+            }
+        }
+    }
+}
diff --git a/Timeline/Services/PathProvider.cs b/Timeline/Services/PathProvider.cs
index ac7cd800..1baba5c0 100644
--- a/Timeline/Services/PathProvider.cs
+++ b/Timeline/Services/PathProvider.cs
@@ -8,6 +8,7 @@ namespace Timeline.Services
     {
         public string GetWorkingDirectory();
         public string GetDatabaseFilePath();
+        public string GetDatabaseBackupDirectory();
     }
 
     public class PathProvider : IPathProvider
@@ -32,5 +33,10 @@ namespace Timeline.Services
         {
             return Path.Combine(_workingDirectory, ApplicationConfiguration.DatabaseFileName);
         }
+
+        public string GetDatabaseBackupDirectory()
+        {
+            return Path.Combine(_workingDirectory, ApplicationConfiguration.DatabaseBackupDirectoryName);
+        }
     }
 }
diff --git a/Timeline/Startup.cs b/Timeline/Startup.cs
index 597fa4c3..a5eab4ad 100644
--- a/Timeline/Startup.cs
+++ b/Timeline/Startup.cs
@@ -64,6 +64,8 @@ namespace Timeline
 
             services.AddSingleton<IPathProvider, PathProvider>();
 
+            services.AddSingleton<IDatabaseBackupService, DatabaseBackupService>();
+
             services.AddAutoMapper(GetType().Assembly);
 
             services.AddTransient<IClock, Clock>();
-- 
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