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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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