private Expression PrepareExpression(out IQbservableProvider realProvider)
{
Contract.Ensures(Contract.ValueAtReturn(out realProvider) != null);
Contract.Ensures(Contract.Result <Expression>() != null);
Log.ServerReceivingExpression(clientId, Expression);
var source = Provider.GetSource(argument);
realProvider = source.Provider;
ExpressionVisitor visitor;
Expression preparedExpression = null;
if (!Provider.Options.AllowExpressionsUnrestricted)
{
visitor = new SecurityExpressionVisitor(Provider.Options);
preparedExpression = visitor.Visit(Expression);
}
visitor = ReplaceConstantsVisitor.Create(
typeof(QbservableSourcePlaceholder <TSource>),
source,
typeof(IQbservable <TSource>),
(actualTypeInQuery, actualTypeInServer) =>
{
throw new InvalidOperationException("The client specified the wrong data type for the query." + Environment.NewLine
+ "Client data type: " + actualTypeInQuery.FullName + Environment.NewLine
+ "Actual data type: " + actualTypeInServer.FullName);
});
preparedExpression = visitor.Visit(preparedExpression ?? Expression);
visitor = ReplaceConstantsVisitor.Create(
typeof(DuplexCallback),
(value, _) =>
{
var callback = (DuplexCallback)value;
callback.SetServerProtocol(Provider.Protocol);
return(callback);
},
type => type);
preparedExpression = visitor.Visit(preparedExpression);
foreach (var customVisitorFactory in Provider.Options.VisitorFactories)
{
var customVisitor = customVisitorFactory();
preparedExpression = customVisitor.Visit(preparedExpression);
}
Log.ServerRewrittenExpression(clientId, preparedExpression);
return(preparedExpression);
}
private Expression PrepareExpression(out IQbservableProvider realProvider)
{
QbservableProviderDiagnostics.DebugPrint(Expression, "TcpServerQuery Received Expression");
var source = Provider.GetSource(argument);
realProvider = source.Provider;
ExpressionVisitor visitor;
Expression preparedExpression = null;
if (!Provider.Options.AllowExpressionsUnrestricted)
{
visitor = new SecurityExpressionVisitor(Provider.Options);
preparedExpression = visitor.Visit(Expression);
}
visitor = ReplaceConstantsVisitor.Create(
typeof(QbservableSourcePlaceholder <TSource>),
source,
typeof(IQbservable <TSource>),
(actualTypeInQuery, actualTypeInServer) =>
{
throw new InvalidOperationException("The client specified the wrong data type for the query." + Environment.NewLine
+ "Client data type: " + actualTypeInQuery.FullName + Environment.NewLine
+ "Actual data type: " + actualTypeInServer.FullName);
});
preparedExpression = visitor.Visit(preparedExpression ?? Expression);
visitor = ReplaceConstantsVisitor.Create(
typeof(DuplexCallback),
(value, _) =>
{
var callback = (DuplexCallback)value;
callback.SetServerProtocol(Provider.Protocol);
return(callback);
},
type => type);
preparedExpression = visitor.Visit(preparedExpression);
QbservableProviderDiagnostics.DebugPrint(preparedExpression, "TcpServerQuery Rewritten Expression");
return(preparedExpression);
}
