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MigrationsModelDiffer.cs
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MigrationsModelDiffer.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Laraue.EfCoreTriggers.Common.Services.Impl.TriggerVisitors;
using Laraue.EfCoreTriggers.Common.TriggerBuilders.Base;
using Microsoft.EntityFrameworkCore.ChangeTracking.Internal;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using Microsoft.EntityFrameworkCore.Migrations;
using Microsoft.EntityFrameworkCore.Migrations.Operations;
using Microsoft.EntityFrameworkCore.Storage;
using Microsoft.EntityFrameworkCore.Update;
using Microsoft.EntityFrameworkCore.Update.Internal;
namespace Laraue.EfCoreTriggers.Common.Migrations
{
/// <inheritdoc />
public class MigrationsModelDiffer : Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationsModelDiffer
{
private readonly ITriggerVisitor _triggerVisitor;
/// <inheritdoc />
public MigrationsModelDiffer(
IRelationalTypeMappingSource typeMappingSource,
IMigrationsAnnotationProvider migrationsAnnotations,
IChangeDetector changeDetector,
IUpdateAdapterFactory updateAdapterFactory,
ITriggerVisitor triggerVisitor,
CommandBatchPreparerDependencies commandBatchPreparerDependencies)
: base (typeMappingSource, migrationsAnnotations, changeDetector, updateAdapterFactory, commandBatchPreparerDependencies)
{
_triggerVisitor = triggerVisitor;
}
/// <inheritdoc />
public override IReadOnlyList<MigrationOperation> GetDifferences(IRelationalModel source, IRelationalModel target)
{
var deleteTriggerOperations = new List<SqlOperation>();
var createTriggerOperations = new List<SqlOperation>();
var sourceModel = source?.Model;
var targetModel = target?.Model;
_triggerVisitor.ConvertTriggerAnnotationsToSql(sourceModel);
_triggerVisitor.ConvertTriggerAnnotationsToSql(targetModel);
var oldEntityTypeNames = sourceModel.GetEntityTypeNames();
var newEntityTypeNames = targetModel.GetEntityTypeNames();
var commonEntityTypeNames = oldEntityTypeNames
.Intersect(newEntityTypeNames)
.ToArray();
// Drop all triggers for deleted entities.
foreach (var deletedTypeName in oldEntityTypeNames.Except(commonEntityTypeNames))
{
var deletedEntityType = sourceModel?.FindEntityType(deletedTypeName);
foreach (var annotation in deletedEntityType.GetTriggerAnnotations())
{
_triggerVisitor.AddDeleteTriggerSqlMigration(deleteTriggerOperations, annotation, deletedEntityType);
}
}
// Add all triggers to created entities.
foreach (var newTypeName in newEntityTypeNames.Except(commonEntityTypeNames))
{
foreach (var annotation in targetModel?.FindEntityType(newTypeName).GetTriggerAnnotations() ?? Array.Empty<IAnnotation>())
{
createTriggerOperations.AddCreateTriggerSqlMigration(annotation);
}
}
// For existing entities.
foreach (var entityTypeName in commonEntityTypeNames)
{
var oldEntityType = sourceModel?.FindEntityType(entityTypeName);
var newEntityType = targetModel?.FindEntityType(entityTypeName);
var oldAnnotationNames = sourceModel?.FindEntityType(entityTypeName)
.GetTriggerAnnotations()
.Select(x => x.Name)
.ToArray()
?? Array.Empty<string>();
var newAnnotationNames = targetModel?.FindEntityType(entityTypeName)
.GetTriggerAnnotations()
.Select(x => x.Name)
.ToArray()
?? Array.Empty<string>();
var commonAnnotationNames = oldAnnotationNames
.Intersect(newAnnotationNames)
.ToArray();
// If trigger was changed, recreate it.
foreach (var commonAnnotationName in commonAnnotationNames)
{
var oldValue = sourceModel?.FindEntityType(entityTypeName)?.GetAnnotation(commonAnnotationName);
var newValue = targetModel?.FindEntityType(entityTypeName)?.GetAnnotation(commonAnnotationName);
if (oldValue?.Value.ToString() == newValue?.Value.ToString())
{
continue;
}
_triggerVisitor.AddDeleteTriggerSqlMigration(deleteTriggerOperations, oldValue, sourceModel?.FindEntityType(entityTypeName));
createTriggerOperations.AddCreateTriggerSqlMigration(newValue);
}
// If trigger was removed, delete it.
foreach (var oldTriggerName in oldAnnotationNames.Except(commonAnnotationNames))
{
var oldTriggerAnnotation = oldEntityType?.GetAnnotation(oldTriggerName);
_triggerVisitor.AddDeleteTriggerSqlMigration(deleteTriggerOperations, oldTriggerAnnotation, oldEntityType);
}
// If trigger was added, create it.
foreach (var newTriggerName in newAnnotationNames.Except(commonAnnotationNames))
{
var newTriggerAnnotation = newEntityType?.GetAnnotation(newTriggerName);
createTriggerOperations.AddCreateTriggerSqlMigration(newTriggerAnnotation);
}
}
return MergeOperations(base.GetDifferences(source, target), createTriggerOperations, deleteTriggerOperations);
}
private IReadOnlyList<MigrationOperation> MergeOperations(
IEnumerable<MigrationOperation> migrationOperations,
IEnumerable<MigrationOperation> createTriggersOperations,
IEnumerable<MigrationOperation> deleteTriggersOperation)
{
return new List<MigrationOperation>(deleteTriggersOperation)
.Concat(migrationOperations)
.Concat(createTriggersOperations)
.ToList();
}
}
/// <summary>
/// Extensions to create migrations for EF Core triggers.
/// </summary>
public static class MigrationsExtensions
{
#if NET6_0_OR_GREATER
private static readonly FieldInfo AnnotationsField = typeof(AnnotatableBase)
.GetField("_annotations", BindingFlags.Instance | BindingFlags.NonPublic);
#else
private static readonly FieldInfo AnnotationsField = typeof(Annotatable)
.GetField("_annotations", BindingFlags.Instance | BindingFlags.NonPublic);
#endif
/// <summary>
/// Convert all not translated annotations of <see cref="ITrigger"/> type to SQL.
/// </summary>
/// <param name="triggerVisitor"></param>
/// <param name="model"></param>
public static void ConvertTriggerAnnotationsToSql(this ITriggerVisitor triggerVisitor, IModel model)
{
foreach (var entityType in model?.GetEntityTypes() ?? Enumerable.Empty<IEntityType>())
{
var annotations = (SortedDictionary<string, Annotation>) AnnotationsField.GetValue(entityType);
if (annotations is null)
{
return;
}
foreach (var key in annotations.Keys.ToArray())
{
if (!key.StartsWith(Constants.AnnotationKey))
{
continue;
}
var annotation = annotations[key];
var value = annotation.Value;
if (value is not ITrigger trigger)
{
continue;
}
var sql = triggerVisitor.GenerateCreateTriggerSql(trigger);
annotations[key] = new ConventionAnnotation(key, sql, ConfigurationSource.DataAnnotation);
}
}
}
/// <summary>
/// Get names of entities in <see cref="IModel"/>.
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public static string[] GetEntityTypeNames(this IModel model)
{
return model?
.GetEntityTypes()
.Select(x => x.Name)
.ToArray()
?? Array.Empty<string>();
}
/// <summary>
/// Get all trigger annotations from <see cref="IEntityType"/>.
/// </summary>
/// <param name="entityType"></param>
/// <returns></returns>
public static IEnumerable<IAnnotation> GetTriggerAnnotations(this IEntityType entityType)
{
return entityType?.GetAnnotations()
.Where(x => x.Name.StartsWith(Constants.AnnotationKey))
?? Enumerable.Empty<IAnnotation>();
}
/// <summary>
/// Adds sql operations necessary to create triggers.
/// </summary>
/// <param name="list"></param>
/// <param name="annotation"></param>
/// <returns></returns>
public static IList<SqlOperation> AddCreateTriggerSqlMigration(this IList<SqlOperation> list, IAnnotation annotation)
{
if (annotation.Value is not string createSql)
{
return list;
}
list.Add(new SqlOperation
{
Sql = createSql,
});
return list;
}
/// <summary>
/// Adds sql operations necessary to drop triggers.
/// </summary>
/// <param name="triggerVisitor"></param>
/// <param name="list"></param>
/// <param name="annotation"></param>
/// <param name="entityType"></param>
/// <returns></returns>
public static IList<SqlOperation> AddDeleteTriggerSqlMigration(this ITriggerVisitor triggerVisitor, IList<SqlOperation> list, IAnnotation annotation, IEntityType entityType)
{
list.Add(new SqlOperation
{
Sql = triggerVisitor.GenerateDeleteTriggerSql(annotation.Name, entityType),
});
return list;
}
}
}