private bool Migrate(MongoBackupStrategy backupStrategy, MongoMigrationStrategy migrationStrategy)
{
var currentSchema = _database
.GetCollection <SchemaDto>(_storageOptions.Prefix + ".schema")
.Find(_ => true)
.FirstOrDefault();
if (currentSchema == null)
{
// We do not have a schema version yet
// - assume an empty database and run full migrations
currentSchema = new SchemaDto
{
Version = MongoSchema.None
};
}
if (RequiredSchemaVersion < currentSchema.Version)
{
var assemblyName = GetType().GetTypeInfo().Assembly.GetName();
throw new InvalidOperationException(
$"{Environment.NewLine}{assemblyName.Name} version: {assemblyName.Version}, uses a schema prior to the current database." +
$"{Environment.NewLine}Backwards migration is not supported. Please resolve this manually (e.g. by dropping the database)." +
$"{Environment.NewLine}Please see https://github.com/sergeyzwezdin/Hangfire.Mongo#migration for further information.");
}
if (RequiredSchemaVersion == currentSchema.Version)
{
// Nothing to migrate - so let's get outta here.
return(false);
}
if (backupStrategy == null)
{
throw new InvalidOperationException(
$"{Environment.NewLine}You need to choose a migration strategy by setting the {nameof(MongoStorageOptions)}.{nameof(MongoStorageOptions.MigrationOptions)} property." +
$"{Environment.NewLine}Please see https://github.com/sergeyzwezdin/Hangfire.Mongo#migration for further information.");
}
backupStrategy
.Backup(_storageOptions, _database, currentSchema.Version, RequiredSchemaVersion);
migrationStrategy
.Execute(_storageOptions, _database, currentSchema.Version, RequiredSchemaVersion);
return(true);
}
/// <summary>
/// Constructs migration options with specific strategy.
/// </summary>
/// <param name="strategy">The migration strategy to use</param>
public MongoMigrationOptions(MongoMigrationStrategy strategy)
{
Strategy = strategy;
BackupStrategy = MongoBackupStrategy.Collections;
BackupPostfix = "migrationbackup";
}