public void HandleSubscription(CollectionSubscription subscription, Type dbContextType,
IServiceProvider requestServiceProvider, ConnectionBase connection, KeyValuePair <Type, string> property,
List <ChangeResponse> collectionChanges, List <ChangeResponse> allChanges)
{
try
{
bool anyCollectionChanges = collectionChanges.Any();
if ((anyCollectionChanges && subscription.Prefilters.Any(prefilter =>
prefilter is IAfterQueryPrefilter || prefilter is TakePrefilter || prefilter is SkipPrefilter)) ||
HasIncludePrefilterWithChange(subscription, allChanges))
{
SapphireDbContext db = dbContextAccessor.GetContext(dbContextType, requestServiceProvider);
IQueryable <object> collectionValues = db.GetCollectionValues(requestServiceProvider,
connection.Information, property, subscription.Prefilters);
IAfterQueryPrefilter afterQueryPrefilter =
subscription.Prefilters.OfType <IAfterQueryPrefilter>().FirstOrDefault();
if (afterQueryPrefilter != null)
{
afterQueryPrefilter.Initialize(property.Key);
_ = connection.Send(new QueryResponse()
{
ReferenceId = subscription.ReferenceId,
Result = afterQueryPrefilter.Execute(collectionValues)
});
}
else
{
_ = connection.Send(new QueryResponse()
{
ReferenceId = subscription.ReferenceId,
Result = collectionValues
.AsEnumerable()
.Select(v => v.GetAuthenticatedQueryModel(connection.Information, serviceProvider))
.ToList()
});
}
}
else if (anyCollectionChanges)
{
IEnumerable <WherePrefilter> wherePrefilters = subscription.Prefilters.OfType <WherePrefilter>();
foreach (WherePrefilter wherePrefilter in wherePrefilters)
{
wherePrefilter.Initialize(property.Key);
Func <object, bool> whereFunction = wherePrefilter.WhereExpression.Compile();
collectionChanges = collectionChanges.Where((change) => whereFunction(change.Value)).ToList();
}
collectionChanges.ForEach(change =>
{
object value =
change.Value.GetAuthenticatedQueryModel(connection.Information, requestServiceProvider);
_ = connection.Send(change.CreateResponse(subscription.ReferenceId, value));
});
}
}
catch (Exception ex)
{
SubscribeCommand tempErrorCommand = new SubscribeCommand()
{
CollectionName = subscription.CollectionName,
ReferenceId = subscription.ReferenceId,
Prefilters = subscription.Prefilters
};
_ = connection.Send(tempErrorCommand.CreateExceptionResponse <ResponseBase>(ex));
logger.LogError(
$"Error handling subscription '{subscription.ReferenceId}' of {subscription.CollectionName}");
logger.LogError(ex.Message);
}
}
public void HandleCollections(ConnectionBase connection, string contextName, Type dbContextType,
List <ChangeResponse> changes, IServiceProvider requestServiceProvider)
{
IEnumerable <IGrouping <string, CollectionSubscription> > subscriptionGroupings = connection.Subscriptions
.Where(s => s.ContextName == contextName)
.GroupBy(s => s.CollectionName);
foreach (IGrouping <string, CollectionSubscription> subscriptionGrouping in subscriptionGroupings)
{
KeyValuePair <Type, string> property = dbContextType.GetDbSetType(subscriptionGrouping.Key);
List <ChangeResponse> changesForCollection = changes
.Where(c => c.CollectionName == subscriptionGrouping.Key)
.ToList();
AuthModelInfo modelInfo = property.Key.GetAuthModelInfos();
IEnumerable <ChangeResponse> authenticatedChanges = changesForCollection;
if (modelInfo.QueryEntryAuthAttributes.Any())
{
authenticatedChanges = changesForCollection
.Where(change => change.State == ChangeResponse.ChangeState.Deleted ||
property.Key.CanQueryEntry(connection.Information, requestServiceProvider,
change.Value));
IEnumerable <ChangeResponse> oldLoadedNotAllowed = changesForCollection
.Where(change => change.State == ChangeResponse.ChangeState.Modified &&
!property.Key.CanQueryEntry(connection.Information, requestServiceProvider,
change.Value))
.Select(change =>
{
ChangeResponse newChangeResponse = change.CreateResponse(null, change.Value);
newChangeResponse.State = ChangeResponse.ChangeState.Deleted;
return(newChangeResponse);
});
authenticatedChanges = authenticatedChanges.Concat(oldLoadedNotAllowed);
}
List <ChangeResponse> collectionChanges = authenticatedChanges.ToList();
if (collectionChanges.Any())
{
QueryFunctionAttribute queryFunctionAttribute =
property.Key.GetCustomAttribute <QueryFunctionAttribute>(false);
if (queryFunctionAttribute != null)
{
var queryFunctionInfo = property.Key.GetMethod(queryFunctionAttribute.Function,
BindingFlags.Default | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
if (queryFunctionInfo != null)
{
object[] methodParameters =
queryFunctionInfo.CreateParameters(connection.Information, serviceProvider);
dynamic queryFunctionExpression =
((dynamic)queryFunctionInfo.Invoke(null, methodParameters)).Compile();
collectionChanges = collectionChanges.Where(change => queryFunctionExpression(change.Value))
.ToList();
}
}
}
foreach (CollectionSubscription subscription in subscriptionGrouping)
{
Task.Run(() =>
{
HandleSubscription(subscription, dbContextType, requestServiceProvider, connection,
property, collectionChanges, changes);
});
}
}
}
public void HandleSubscription(CollectionSubscription subscription, Type dbContextType,
IServiceProvider requestServiceProvider, ConnectionBase connection, KeyValuePair <Type, string> property,
List <ChangeResponse> collectionChanges, List <ChangeResponse> allChanges)
{
try
{
bool anyCollectionChanges = collectionChanges.Any();
if ((anyCollectionChanges && subscription.Prefilters.Any(prefilter =>
prefilter is IAfterQueryPrefilter || prefilter is TakePrefilter || prefilter is SkipPrefilter)) ||
HasIncludePrefilterWithChange(subscription, allChanges))
{
SapphireDbContext db = dbContextAccessor.GetContext(dbContextType, requestServiceProvider);
IQueryable <object> collectionValues = db.GetCollectionValues(requestServiceProvider,
connection.Information, property, subscription.Prefilters);
IAfterQueryPrefilter afterQueryPrefilter =
subscription.Prefilters.OfType <IAfterQueryPrefilter>().FirstOrDefault();
if (afterQueryPrefilter != null)
{
afterQueryPrefilter.Initialize(property.Key);
_ = connection.Send(new QueryResponse()
{
ReferenceId = subscription.ReferenceId,
Result = afterQueryPrefilter.Execute(collectionValues)
});
}
else
{
_ = connection.Send(new QueryResponse()
{
ReferenceId = subscription.ReferenceId,
Result = collectionValues
.AsEnumerable()
.Select(v => v.GetAuthenticatedQueryModel(connection.Information, serviceProvider))
.ToList()
});
}
}
else if (anyCollectionChanges)
{
IEnumerable <WherePrefilter> wherePrefilters = subscription.Prefilters.OfType <WherePrefilter>();
List <ChangeResponse> oldValuesUnloadResponses = new List <ChangeResponse>();
List <ChangeResponse> newValuesLoadResponses = new List <ChangeResponse>();
foreach (WherePrefilter wherePrefilter in wherePrefilters)
{
wherePrefilter.Initialize(property.Key);
// Values that did change know do match the
oldValuesUnloadResponses.AddRange(
collectionChanges
.Where(change => change.State == ChangeResponse.ChangeState.Modified &&
!wherePrefilter.WhereExpressionCompiled(change.Value) &&
wherePrefilter.WhereExpressionCompiled(change.OriginalValue))
.Select(change =>
{
ChangeResponse newChangeResponse = change.CreateResponse(null, change.Value);
newChangeResponse.State = ChangeResponse.ChangeState.Deleted;
return(newChangeResponse);
})
);
newValuesLoadResponses.AddRange(
collectionChanges
.Where(change => change.State == ChangeResponse.ChangeState.Modified &&
wherePrefilter.WhereExpressionCompiled(change.Value) &&
!wherePrefilter.WhereExpressionCompiled(change.OriginalValue))
.Select(change =>
{
ChangeResponse newChangeResponse = change.CreateResponse(null, change.Value);
newChangeResponse.State = ChangeResponse.ChangeState.Added;
return(newChangeResponse);
})
);
collectionChanges = collectionChanges
.Where((change) => wherePrefilter.WhereExpressionCompiled(change.Value)).ToList();
}
IEnumerable <ChangeResponse> changesForWherePrefilter = oldValuesUnloadResponses
.Concat(newValuesLoadResponses)
.GroupBy(v => v.Value)
.Select(g => g.LastOrDefault());
collectionChanges = collectionChanges.Concat(changesForWherePrefilter).ToList();
ChangesResponse changesResponse = new ChangesResponse()
{
ReferenceId = subscription.ReferenceId,
Changes = collectionChanges.Select(change =>
{
object value =
change.Value.GetAuthenticatedQueryModel(connection.Information, requestServiceProvider);
return(change.CreateResponse(subscription.ReferenceId, value));
}).ToList()
};
if (changesResponse.Changes.Any())
{
_ = connection.Send(changesResponse);
}
}
}
catch (Exception ex)
{
SubscribeCommand tempErrorCommand = new SubscribeCommand()
{
CollectionName = subscription.CollectionName,
ReferenceId = subscription.ReferenceId,
Prefilters = subscription.Prefilters
};
_ = connection.Send(tempErrorCommand.CreateExceptionResponse <ResponseBase>(ex));
logger.LogError(
$"Error handling subscription '{subscription.ReferenceId}' of {subscription.CollectionName}");
logger.LogError(ex.Message);
}
}
