move migrations to migrator project

src/Admin/Admin.csproj

@@ -9,6 +9,7 @@
   
   <ItemGroup>
     <ProjectReference Include="..\Core\Core.csproj" />
+    <ProjectReference Include="..\Migrator\Migrator.csproj" />
   </ItemGroup>
 
   <ItemGroup>

src/Admin/HostedServices/DatabaseMigrationHostedService.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Data.SqlClient;
+using System.Threading;
+using System.Threading.Tasks;
+using Bit.Core;
+using Bit.Core.Jobs;
+using Bit.Migrator;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace Bit.Admin.HostedServices
+{
+    public class DatabaseMigrationHostedService : IHostedService, IDisposable
+    {
+        private readonly GlobalSettings _globalSettings;
+        private readonly ILogger<DatabaseMigrationHostedService> _logger;
+        private readonly DbMigrator _dbMigrator;
+
+        public DatabaseMigrationHostedService(
+            GlobalSettings globalSettings,
+            ILogger<DatabaseMigrationHostedService> logger,
+            ILogger<DbMigrator> migratorLogger,
+            ILogger<JobListener> listenerLogger)
+        {
+            _globalSettings = globalSettings;
+            _logger = logger;
+            _dbMigrator = new DbMigrator(globalSettings.SqlServer.ConnectionString, migratorLogger);
+        }
+
+        public virtual async Task StartAsync(CancellationToken cancellationToken)
+        {
+            var maxMigrationAttempts = 10;
+            for(var i = 1; i <= maxMigrationAttempts; i++)
+            {
+                try
+                {
+                    _dbMigrator.MigrateMsSqlDatabase(true, cancellationToken);
+                    // TODO: Maybe flip a flag somewhere to indicate migration is complete??
+                    break;
+                }
+                catch(SqlException e)
+                {
+                    if(i >= maxMigrationAttempts)
+                    {
+                        _logger.LogError(e, "Database failed to migrate.");
+                        throw e;
+                    }
+                    else
+                    {
+                        _logger.LogError(e,
+                            "Database unavailable for migration. Trying again (attempt #{0})...", i + 1);
+                        await Task.Delay(20000);
+                    }
+                }
+            }
+        }
+
+        public virtual Task StopAsync(CancellationToken cancellationToken)
+        {
+            return Task.FromResult(0);
+        }
+
+        public virtual void Dispose()
+        { }
+    }
+}

src/Admin/Startup.cs

@@ -75,7 +75,11 @@ namespace Bit.Admin
             // Jobs service
             Jobs.JobsHostedService.AddJobsServices(services);
             services.AddHostedService<Jobs.JobsHostedService>();
-            if(!globalSettings.SelfHosted)
+            if(globalSettings.SelfHosted)
+            {
+                services.AddHostedService<HostedServices.DatabaseMigrationHostedService>();
+            }
+            else
             {
                 if(CoreHelpers.SettingHasValue(globalSettings.Storage.ConnectionString))
                 {