GraphUpdatesSqlServerTest does not use retrying execution strategy

[smitpatel]

See #21441

[ajcvickers]

@smitpatel @AndriySvyryd I have investigated this and it appears to be a product bug. Specifically, query looks up whether or not a retrying execution strategy is in use by looking at the execution strategy configured for the context:

        [EntityFrameworkInternal]
        public CompiledQueryCacheKeyGeneratorDependencies(
            [NotNull] IModel model,
            [NotNull] ICurrentDbContext currentContext,
            [NotNull] IExecutionStrategyFactory executionStrategyFactory)
        {
            Check.NotNull(model, nameof(model));
            Check.NotNull(currentContext, nameof(currentContext));
            Check.NotNull(executionStrategyFactory, nameof(executionStrategyFactory));

            Model = model;
            CurrentContext = currentContext;
            IsRetryingExecutionStrategy = executionStrategyFactory.Create().RetriesOnFailure;
        }

However, if an external execution strategy has been created, then looking up RetriesOnFailure like this is broken, since executionStrategyFactory.Create() will not return the execution factory that is in use. We do this in our tests, but an application executing a query in a custom execution factory would also hit this same issue.

Here's a stand-alone repro:

public class Foo
{
    public int Id { get; set; }
}

public class SomeDbContext : DbContext
{
    private static ILoggerFactory ContextLoggerFactory
        => LoggerFactory.Create(b => b.AddConsole().SetMinimumLevel(LogLevel.Information));

    public DbSet<Foo> Foos { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        => optionsBuilder
            //.UseSqlite("Data Source=test.db")
            .UseSqlServer(Your.ConnectionString, b => b.ExecutionStrategy(d => new MySqlServerRetryingExecutionStrategyDi(d)))
            .UseLoggerFactory(ContextLoggerFactory)
            .EnableSensitiveDataLogging();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
    }
}

public class Program
{
    public static async Task Main()
    {
        using (var context = new SomeDbContext())
        {
            await context.Database.EnsureDeletedAsync();
            await context.Database.EnsureCreatedAsync();

            context.Add(new Foo());
            
            await context.SaveChangesAsync();
        }
        
        using (var context = new SomeDbContext())
        {
            var myExecutionStrategy = new MySqlServerRetryingExecutionStrategySo(context);
            myExecutionStrategy.Execute(0, (c, s) => c.Set<Foo>().ToList(), null);
        }
    }
}

public class MySqlServerRetryingExecutionStrategyDi : SqlServerRetryingExecutionStrategy
{
    public MySqlServerRetryingExecutionStrategyDi(ExecutionStrategyDependencies dependencies) : base(dependencies)
    {
    }

    public override bool RetriesOnFailure
    {
        get
        {
            Console.WriteLine("Calling RetriesOnFailure on D.I. execution strategy");
            return base.RetriesOnFailure;
        }
    }
}

public class MySqlServerRetryingExecutionStrategySo : SqlServerRetryingExecutionStrategy
{
    public MySqlServerRetryingExecutionStrategySo(DbContext context) : base(context)
    {
    }

    public override bool RetriesOnFailure
    {
        get
        {
            Console.WriteLine("Calling RetriesOnFailure on stand-alone execution strategy");
            return base.RetriesOnFailure;
        }
    }
}

Output:

warn: Microsoft.EntityFrameworkCore.Model.Validation[10400]
      Sensitive data logging is enabled. Log entries and exception messages may include sensitive application data; this mode should only be enabled during development.
Calling RetriesOnFailure on D.I. execution strategy
Calling RetriesOnFailure on D.I. execution strategy
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
      Entity Framework Core 5.0.0 initialized 'SomeDbContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: SensitiveDataLoggingEnabled 
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (28ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT 1
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (26ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
      IF SERVERPROPERTY('EngineEdition') <> 5
      BEGIN
          ALTER DATABASE [Blogs] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
      END;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (50ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
      DROP DATABASE [Blogs];
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (316ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
      CREATE DATABASE [Blogs];
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (134ms) [Parameters=[], CommandType='Text', CommandTimeout='60']
      IF SERVERPROPERTY('EngineEdition') <> 5
      BEGIN
          ALTER DATABASE [Blogs] SET READ_COMMITTED_SNAPSHOT ON;
      END;
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT 1
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (6ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      CREATE TABLE [Foos] (
          [Id] int NOT NULL IDENTITY,
          CONSTRAINT [PK_Foos] PRIMARY KEY ([Id])
      );
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (14ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SET NOCOUNT ON;
      INSERT INTO [Foos]
      DEFAULT VALUES;
      SELECT [Id]
      FROM [Foos]
      WHERE @@ROWCOUNT = 1 AND [Id] = scope_identity();
Calling RetriesOnFailure on D.I. execution strategy
Calling RetriesOnFailure on D.I. execution strategy
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
      Entity Framework Core 5.0.0 initialized 'SomeDbContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: SensitiveDataLoggingEnabled 
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT [f].[Id]
      FROM [Foos] AS [f]