From 6e067a28d8527726a2a17045bef0f0e3d3430ed5 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 23 Apr 2021 17:28:18 +0800
Subject: refactor: Refactor a lot.

---
 .../DatabaseManagement/DatabaseCustomMigrator.cs   | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 BackEnd/Timeline/Services/DatabaseManagement/DatabaseCustomMigrator.cs

(limited to 'BackEnd/Timeline/Services/DatabaseManagement/DatabaseCustomMigrator.cs')

diff --git a/BackEnd/Timeline/Services/DatabaseManagement/DatabaseCustomMigrator.cs b/BackEnd/Timeline/Services/DatabaseManagement/DatabaseCustomMigrator.cs
new file mode 100644
index 00000000..2180ad40
--- /dev/null
+++ b/BackEnd/Timeline/Services/DatabaseManagement/DatabaseCustomMigrator.cs
@@ -0,0 +1,56 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Timeline.Entities;
+
+namespace Timeline.Services.DatabaseManagement
+{
+    public interface IDatabaseCustomMigrator
+    {
+        Task MigrateAsync(CancellationToken cancellationToken = default);
+    }
+
+    public class DatabaseCustomMigrator : IDatabaseCustomMigrator
+    {
+        private IEnumerable<IDatabaseCustomMigration> _migrations;
+        private DatabaseContext _database;
+
+        private ILogger<DatabaseCustomMigrator> _logger;
+
+        public DatabaseCustomMigrator(IEnumerable<IDatabaseCustomMigration> migrations, DatabaseContext database, ILogger<DatabaseCustomMigrator> logger)
+        {
+            _migrations = migrations;
+            _database = database;
+            _logger = logger;
+        }
+
+        public async Task MigrateAsync(CancellationToken cancellationToken = default)
+        {
+            foreach (var migration in _migrations)
+            {
+                var name = migration.GetName();
+                var isApplied = await _database.Migrations.AnyAsync(m => m.Name == name, cancellationToken);
+
+                _logger.LogInformation("Found custom migration '{0}'. Applied: {1}.", name, isApplied);
+
+                if (!isApplied)
+                {
+                    _logger.LogWarning("Begin custom migration '{0}'.", name);
+
+                    await using var transaction = await _database.Database.BeginTransactionAsync(cancellationToken);
+
+                    await migration.ExecuteAsync(_database, cancellationToken);
+
+                    _database.Migrations.Add(new MigrationEntity { Name = name });
+                    await _database.SaveChangesAsync(cancellationToken);
+
+                    await transaction.CommitAsync(cancellationToken);
+
+                    _logger.LogWarning("End custom migration '{0}'.", name);
+                }
+            }
+        }
+    }
+}
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