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AbpDbContext.cs
514 lines (435 loc) · 18.6 KB
/
AbpDbContext.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using Abp.Collections.Extensions;
using Abp.Configuration.Startup;
using Abp.Dependency;
using Abp.Domain.Entities;
using Abp.Domain.Entities.Auditing;
using Abp.Domain.Uow;
using Abp.Events.Bus;
using Abp.Events.Bus.Entities;
using Abp.Extensions;
using Abp.Reflection;
using Abp.Runtime.Session;
using Abp.Timing;
using Castle.Core.Logging;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.ChangeTracking;
using Abp.Linq.Expressions;
using Microsoft.EntityFrameworkCore.Metadata;
namespace Abp.EntityFrameworkCore
{
/// <summary>
/// Base class for all DbContext classes in the application.
/// </summary>
public abstract class AbpDbContext : DbContext, ITransientDependency
{
/// <summary>
/// Used to get current session values.
/// </summary>
public IAbpSession AbpSession { get; set; }
/// <summary>
/// Used to trigger entity change events.
/// </summary>
public IEntityChangeEventHelper EntityChangeEventHelper { get; set; }
/// <summary>
/// Reference to the logger.
/// </summary>
public ILogger Logger { get; set; }
/// <summary>
/// Reference to the event bus.
/// </summary>
public IEventBus EventBus { get; set; }
/// <summary>
/// Reference to GUID generator.
/// </summary>
public IGuidGenerator GuidGenerator { get; set; }
/// <summary>
/// Reference to the current UOW provider.
/// </summary>
public ICurrentUnitOfWorkProvider CurrentUnitOfWorkProvider { get; set; }
/// <summary>
/// Reference to multi tenancy configuration.
/// </summary>
public IMultiTenancyConfig MultiTenancyConfig { get; set; }
/// <summary>
/// Can be used to suppress automatically setting TenantId on SaveChanges.
/// Default: false.
/// </summary>
public virtual bool SuppressAutoSetTenantId { get; set; }
protected virtual int? CurrentTenantId => GetCurrentTenantIdOrNull();
protected virtual bool IsSoftDeleteFilterEnabled => CurrentUnitOfWorkProvider?.Current?.IsFilterEnabled(AbpDataFilters.SoftDelete) == true;
protected virtual bool IsMayHaveTenantFilterEnabled => CurrentUnitOfWorkProvider?.Current?.IsFilterEnabled(AbpDataFilters.MayHaveTenant) == true;
protected virtual bool IsMustHaveTenantFilterEnabled => CurrentTenantId != null && CurrentUnitOfWorkProvider?.Current?.IsFilterEnabled(AbpDataFilters.MustHaveTenant) == true;
private static MethodInfo ConfigureGlobalFiltersMethodInfo = typeof(AbpDbContext).GetMethod(nameof(ConfigureGlobalFilters), BindingFlags.Instance | BindingFlags.NonPublic);
/// <summary>
/// Constructor.
/// </summary>
protected AbpDbContext(DbContextOptions options)
: base(options)
{
InitializeDbContext();
}
private void InitializeDbContext()
{
SetNullsForInjectedProperties();
}
private void SetNullsForInjectedProperties()
{
Logger = NullLogger.Instance;
AbpSession = NullAbpSession.Instance;
EntityChangeEventHelper = NullEntityChangeEventHelper.Instance;
GuidGenerator = SequentialGuidGenerator.Instance;
EventBus = NullEventBus.Instance;
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
foreach (var entityType in modelBuilder.Model.GetEntityTypes())
{
ConfigureGlobalFiltersMethodInfo
.MakeGenericMethod(entityType.ClrType)
.Invoke(this, new object[] { modelBuilder, entityType });
}
}
protected void ConfigureGlobalFilters<TEntity>(ModelBuilder modelBuilder, IMutableEntityType entityType)
where TEntity : class
{
if (entityType.BaseType == null && ShouldFilterEntity<TEntity>(entityType))
{
var filterExpression = CreateFilterExpression<TEntity>();
if (filterExpression != null)
{
modelBuilder.Entity<TEntity>().HasQueryFilter(filterExpression);
}
}
}
protected virtual bool ShouldFilterEntity<TEntity>(IMutableEntityType entityType) where TEntity : class
{
if (typeof(ISoftDelete).IsAssignableFrom(typeof(TEntity)))
{
return true;
}
if (typeof(IMayHaveTenant).IsAssignableFrom(typeof(TEntity)))
{
return true;
}
if (typeof(IMustHaveTenant).IsAssignableFrom(typeof(TEntity)))
{
return true;
}
return false;
}
protected virtual Expression<Func<TEntity, bool>> CreateFilterExpression<TEntity>()
where TEntity : class
{
Expression<Func<TEntity, bool>> expression = null;
if (typeof(ISoftDelete).IsAssignableFrom(typeof(TEntity)))
{
/* This condition should normally be defined as below:
* !IsSoftDeleteFilterEnabled || !((ISoftDelete) e).IsDeleted
* But this causes a problem with EF Core (see https://github.com/aspnet/EntityFrameworkCore/issues/9502)
* So, we made a workaround to make it working. It works same as above.
*/
Expression<Func<TEntity, bool>> softDeleteFilter = e => !((ISoftDelete)e).IsDeleted || ((ISoftDelete)e).IsDeleted != IsSoftDeleteFilterEnabled;
expression = expression == null ? softDeleteFilter : CombineExpressions(expression, softDeleteFilter);
}
if (typeof(IMayHaveTenant).IsAssignableFrom(typeof(TEntity)))
{
/* This condition should normally be defined as below:
* !IsMayHaveTenantFilterEnabled || ((IMayHaveTenant)e).TenantId == CurrentTenantId
* But this causes a problem with EF Core (see https://github.com/aspnet/EntityFrameworkCore/issues/9502)
* So, we made a workaround to make it working. It works same as above.
*/
Expression<Func<TEntity, bool>> mayHaveTenantFilter = e => ((IMayHaveTenant)e).TenantId == CurrentTenantId || (((IMayHaveTenant)e).TenantId == CurrentTenantId) == IsMayHaveTenantFilterEnabled;
expression = expression == null ? mayHaveTenantFilter : CombineExpressions(expression, mayHaveTenantFilter);
}
if (typeof(IMustHaveTenant).IsAssignableFrom(typeof(TEntity)))
{
/* This condition should normally be defined as below:
* !IsMustHaveTenantFilterEnabled || ((IMustHaveTenant)e).TenantId == CurrentTenantId
* But this causes a problem with EF Core (see https://github.com/aspnet/EntityFrameworkCore/issues/9502)
* So, we made a workaround to make it working. It works same as above.
*/
Expression<Func<TEntity, bool>> mustHaveTenantFilter = e => ((IMustHaveTenant)e).TenantId == CurrentTenantId || (((IMustHaveTenant)e).TenantId == CurrentTenantId) == IsMustHaveTenantFilterEnabled;
expression = expression == null ? mustHaveTenantFilter : CombineExpressions(expression, mustHaveTenantFilter);
}
return expression;
}
public override int SaveChanges()
{
try
{
var changeReport = ApplyAbpConcepts();
var result = base.SaveChanges();
EntityChangeEventHelper.TriggerEvents(changeReport);
return result;
}
catch (DbUpdateConcurrencyException ex)
{
throw new AbpDbConcurrencyException(ex.Message, ex);
}
}
public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken = default(CancellationToken))
{
try
{
var changeReport = ApplyAbpConcepts();
var result = await base.SaveChangesAsync(cancellationToken);
await EntityChangeEventHelper.TriggerEventsAsync(changeReport);
return result;
}
catch (DbUpdateConcurrencyException ex)
{
throw new AbpDbConcurrencyException(ex.Message, ex);
}
}
protected virtual EntityChangeReport ApplyAbpConcepts()
{
var changeReport = new EntityChangeReport();
var userId = GetAuditUserId();
foreach (var entry in ChangeTracker.Entries().ToList())
{
ApplyAbpConcepts(entry, userId, changeReport);
}
return changeReport;
}
protected virtual void ApplyAbpConcepts(EntityEntry entry, long? userId, EntityChangeReport changeReport)
{
switch (entry.State)
{
case EntityState.Added:
ApplyAbpConceptsForAddedEntity(entry, userId, changeReport);
break;
case EntityState.Modified:
ApplyAbpConceptsForModifiedEntity(entry, userId, changeReport);
break;
case EntityState.Deleted:
ApplyAbpConceptsForDeletedEntity(entry, userId, changeReport);
break;
}
AddDomainEvents(changeReport.DomainEvents, entry.Entity);
}
protected virtual void ApplyAbpConceptsForAddedEntity(EntityEntry entry, long? userId, EntityChangeReport changeReport)
{
CheckAndSetId(entry);
CheckAndSetMustHaveTenantIdProperty(entry.Entity);
CheckAndSetMayHaveTenantIdProperty(entry.Entity);
SetCreationAuditProperties(entry.Entity, userId);
changeReport.ChangedEntities.Add(new EntityChangeEntry(entry.Entity, EntityChangeType.Created));
}
protected virtual void ApplyAbpConceptsForModifiedEntity(EntityEntry entry, long? userId, EntityChangeReport changeReport)
{
SetModificationAuditProperties(entry.Entity, userId);
if (entry.Entity is ISoftDelete && entry.Entity.As<ISoftDelete>().IsDeleted)
{
SetDeletionAuditProperties(entry.Entity, userId);
changeReport.ChangedEntities.Add(new EntityChangeEntry(entry.Entity, EntityChangeType.Deleted));
}
else
{
changeReport.ChangedEntities.Add(new EntityChangeEntry(entry.Entity, EntityChangeType.Updated));
}
}
protected virtual void ApplyAbpConceptsForDeletedEntity(EntityEntry entry, long? userId, EntityChangeReport changeReport)
{
CancelDeletionForSoftDelete(entry);
SetDeletionAuditProperties(entry.Entity, userId);
changeReport.ChangedEntities.Add(new EntityChangeEntry(entry.Entity, EntityChangeType.Deleted));
}
protected virtual void AddDomainEvents(List<DomainEventEntry> domainEvents, object entityAsObj)
{
var generatesDomainEventsEntity = entityAsObj as IGeneratesDomainEvents;
if (generatesDomainEventsEntity == null)
{
return;
}
if (generatesDomainEventsEntity.DomainEvents.IsNullOrEmpty())
{
return;
}
domainEvents.AddRange(generatesDomainEventsEntity.DomainEvents.Select(eventData => new DomainEventEntry(entityAsObj, eventData)));
generatesDomainEventsEntity.DomainEvents.Clear();
}
protected virtual void CheckAndSetId(EntityEntry entry)
{
//Set GUID Ids
var entity = entry.Entity as IEntity<Guid>;
if (entity != null && entity.Id == Guid.Empty)
{
var dbGeneratedAttr = ReflectionHelper
.GetSingleAttributeOrDefault<DatabaseGeneratedAttribute>(
entry.Property("Id").Metadata.PropertyInfo
);
if (dbGeneratedAttr == null || dbGeneratedAttr.DatabaseGeneratedOption == DatabaseGeneratedOption.None)
{
entity.Id = GuidGenerator.Create();
}
}
}
protected virtual void CheckAndSetMustHaveTenantIdProperty(object entityAsObj)
{
if (SuppressAutoSetTenantId)
{
return;
}
//Only set IMustHaveTenant entities
if (!(entityAsObj is IMustHaveTenant))
{
return;
}
var entity = entityAsObj.As<IMustHaveTenant>();
//Don't set if it's already set
if (entity.TenantId != 0)
{
return;
}
var currentTenantId = GetCurrentTenantIdOrNull();
if (currentTenantId != null)
{
entity.TenantId = currentTenantId.Value;
}
else
{
throw new AbpException("Can not set TenantId to 0 for IMustHaveTenant entities!");
}
}
protected virtual void CheckAndSetMayHaveTenantIdProperty(object entityAsObj)
{
if (SuppressAutoSetTenantId)
{
return;
}
//Only works for single tenant applications
if (MultiTenancyConfig?.IsEnabled ?? false)
{
return;
}
//Only set IMayHaveTenant entities
if (!(entityAsObj is IMayHaveTenant))
{
return;
}
var entity = entityAsObj.As<IMayHaveTenant>();
//Don't set if it's already set
if (entity.TenantId != null)
{
return;
}
entity.TenantId = GetCurrentTenantIdOrNull();
}
protected virtual void SetCreationAuditProperties(object entityAsObj, long? userId)
{
EntityAuditingHelper.SetCreationAuditProperties(MultiTenancyConfig, entityAsObj, AbpSession.TenantId, userId);
}
protected virtual void SetModificationAuditProperties(object entityAsObj, long? userId)
{
EntityAuditingHelper.SetModificationAuditProperties(MultiTenancyConfig, entityAsObj, AbpSession.TenantId, userId);
}
protected virtual void CancelDeletionForSoftDelete(EntityEntry entry)
{
if (!(entry.Entity is ISoftDelete))
{
return;
}
entry.Reload();
entry.State = EntityState.Modified;
entry.Entity.As<ISoftDelete>().IsDeleted = true;
}
protected virtual void SetDeletionAuditProperties(object entityAsObj, long? userId)
{
if (entityAsObj is IHasDeletionTime)
{
var entity = entityAsObj.As<IHasDeletionTime>();
if (entity.DeletionTime == null)
{
entity.DeletionTime = Clock.Now;
}
}
if (entityAsObj is IDeletionAudited)
{
var entity = entityAsObj.As<IDeletionAudited>();
if (entity.DeleterUserId != null)
{
return;
}
if (userId == null)
{
entity.DeleterUserId = null;
return;
}
//Special check for multi-tenant entities
if (entity is IMayHaveTenant || entity is IMustHaveTenant)
{
//Sets LastModifierUserId only if current user is in same tenant/host with the given entity
if ((entity is IMayHaveTenant && entity.As<IMayHaveTenant>().TenantId == AbpSession.TenantId) ||
(entity is IMustHaveTenant && entity.As<IMustHaveTenant>().TenantId == AbpSession.TenantId))
{
entity.DeleterUserId = userId;
}
else
{
entity.DeleterUserId = null;
}
}
else
{
entity.DeleterUserId = userId;
}
}
}
protected virtual long? GetAuditUserId()
{
if (AbpSession.UserId.HasValue &&
CurrentUnitOfWorkProvider != null &&
CurrentUnitOfWorkProvider.Current != null &&
CurrentUnitOfWorkProvider.Current.GetTenantId() == AbpSession.TenantId)
{
return AbpSession.UserId;
}
return null;
}
protected virtual int? GetCurrentTenantIdOrNull()
{
if (CurrentUnitOfWorkProvider != null &&
CurrentUnitOfWorkProvider.Current != null)
{
return CurrentUnitOfWorkProvider.Current.GetTenantId();
}
return AbpSession.TenantId;
}
protected virtual Expression<Func<T, bool>> CombineExpressions<T>(Expression<Func<T, bool>> expression1, Expression<Func<T, bool>> expression2)
{
var parameter = Expression.Parameter(typeof(T));
var leftVisitor = new ReplaceExpressionVisitor(expression1.Parameters[0], parameter);
var left = leftVisitor.Visit(expression1.Body);
var rightVisitor = new ReplaceExpressionVisitor(expression2.Parameters[0], parameter);
var right = rightVisitor.Visit(expression2.Body);
return Expression.Lambda<Func<T, bool>>(Expression.AndAlso(left, right), parameter);
}
class ReplaceExpressionVisitor : ExpressionVisitor
{
private readonly Expression _oldValue;
private readonly Expression _newValue;
public ReplaceExpressionVisitor(Expression oldValue, Expression newValue)
{
_oldValue = oldValue;
_newValue = newValue;
}
public override Expression Visit(Expression node)
{
if (node == _oldValue)
{
return _newValue;
}
return base.Visit(node);
}
}
}
}