public MigratedUpEventArgs(MigratedItem migration)
{
this.Migration = migration;
}
public void Run()
{
var collection = Database.GetCollection <MigratedItem>("Migrations");
var filter = Builders <MigratedItem> .Filter.Empty;
var latestMigration = collection.Find(filter).SortByDescending(x => x.MigrationNumber).Limit(1).Project(x => x.MigrationNumber).FirstOrDefault();
Dictionary <int, Type> migrations = new Dictionary <int, Type>();
foreach (var ass in _migrationOptions.Assemblies)
{
foreach (var t in ass.GetTypes())
{
if (t != typeof(Migration))
{
if (typeof(Migration).IsAssignableFrom(t))
{
MigrationAttribute att = t.GetCustomAttribute <MigrationAttribute>();
if (att == null)
{
this.HandleException($"The type '{t.FullName}' must be decorated with '{typeof(MigrationAttribute).FullName}'.");
}
if (migrations.ContainsKey(att.MigrationNumber))
{
this.HandleException($"Migration {att.MigrationNumber} on {t.FullName} has already been registered on {migrations[att.MigrationNumber].FullName}.");
}
else
{
migrations.Add(att.MigrationNumber, t);
}
}
}
}
}
foreach (var mig in migrations.OrderBy(x => x.Key))
{
int migrationNumber = mig.Key;
Type type = mig.Value;
if (migrationNumber > latestMigration)
{
try
{
Migration m = ActivatorUtilities.CreateInstance(_serviceProvider, type) as Migration;
m.Migrate(this.Database);
try
{
//***********************************
//* Use transasctions if supported. *
//***********************************
using (var session = Database.Client.StartSession())
{
try
{
m.MigrateAsTransaction(this.Database, session);
if (session.IsInTransaction)
{
session.CommitTransaction();
}
}
catch
{
if (session.IsInTransaction)
{
session.AbortTransaction();
}
throw;
}
}
}
catch
{
throw;
}
MigratedItem migratedItem = new MigratedItem()
{
MigrationNumber = migrationNumber,
Description = m.Description,
Type = type.FullName,
Assembly = type.Assembly.GetName().Name,
TimeStamp = DateTime.UtcNow
};
collection.InsertOne(migratedItem);
if (_logger != null)
{
_logger.LogInformation("Successfully migrated to {MigrationNumber}.", migrationNumber);
}
}
catch (Exception ex)
{
this.HandleException($"An error occurred migrating '{type.FullName}' to version {migrationNumber}.", ex);
}
}
}
}