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| 1 | +using System.Diagnostics; |
| 2 | +using BervProject.WebApi.Boilerplate.EntityFramework; |
| 3 | +using Microsoft.EntityFrameworkCore; |
| 4 | + |
| 5 | +namespace BervProject.WebApi.Boilerplate.MigrationService; |
| 6 | + |
| 7 | +public class Worker : BackgroundService |
| 8 | +{ |
| 9 | + public const string ActivitySourceName = "Migrations"; |
| 10 | + private static readonly ActivitySource SActivitySource = new(ActivitySourceName); |
| 11 | + |
| 12 | + private readonly IServiceProvider _serviceProvider; |
| 13 | + private readonly IHostApplicationLifetime _hostApplicationLifetime; |
| 14 | + |
| 15 | + public Worker(IServiceProvider serviceProvider, |
| 16 | + IHostApplicationLifetime hostApplicationLifetime) |
| 17 | + { |
| 18 | + _serviceProvider = serviceProvider; |
| 19 | + _hostApplicationLifetime = hostApplicationLifetime; |
| 20 | + } |
| 21 | + |
| 22 | + protected override async Task ExecuteAsync(CancellationToken cancellationToken) |
| 23 | + { |
| 24 | + using var activity = SActivitySource.StartActivity("Migrating database", ActivityKind.Client); |
| 25 | + |
| 26 | + try |
| 27 | + { |
| 28 | + using var scope = _serviceProvider.CreateScope(); |
| 29 | + var dbContext = scope.ServiceProvider.GetRequiredService<BoilerplateDbContext>(); |
| 30 | + |
| 31 | + await RunMigrationAsync(dbContext, cancellationToken); |
| 32 | + } |
| 33 | + catch (Exception ex) |
| 34 | + { |
| 35 | + activity?.AddException(ex); |
| 36 | + throw; |
| 37 | + } |
| 38 | + |
| 39 | + _hostApplicationLifetime.StopApplication(); |
| 40 | + } |
| 41 | + |
| 42 | + private static async Task RunMigrationAsync(BoilerplateDbContext dbContext, CancellationToken cancellationToken) |
| 43 | + { |
| 44 | + var strategy = dbContext.Database.CreateExecutionStrategy(); |
| 45 | + await strategy.ExecuteAsync(async () => |
| 46 | + { |
| 47 | + // Run migration in a transaction to avoid partial migration if it fails. |
| 48 | + await dbContext.Database.MigrateAsync(cancellationToken); |
| 49 | + }); |
| 50 | + } |
| 51 | + |
| 52 | +} |
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