private static LambdaExpression ReplaceEnumerables(IConnectQlFunctions functions, string name, LambdaExpression lambda)
{
while (lambda.Parameters.Any(p => p.Type.HasInterface(typeof(IEnumerable <>)) && p.Type != typeof(string)))
{
var replacements = lambda.Parameters
.Select(p => new
{
Original = p,
ReplaceBy = p.Type.HasInterface(typeof(IEnumerable <>)) && p.Type != typeof(string) ?
Expression.Parameter(typeof(IAsyncEnumerable <>).MakeGenericType(p.Type.GenericTypeArguments[0]), p.Name) :
p,
})
.ToArray();
var enumerableParameter = replacements.First(p => p.ReplaceBy.Type.HasInterface(typeof(IAsyncEnumerable <>)));
functions.Logger?.Warning($"Parameter {enumerableParameter.Original.Name} of function {name} is an IEnumerable<T>, this reduces performance, consider using IAsyncEnumerable<T>.");
lambda = Expression.Lambda(
GenericVisitor.Visit(
(MethodCallExpression e) =>
e.Object != enumerableParameter.Original && !e.Arguments.Contains(enumerableParameter.Original)
? null
: TaskExpression.Task(
Expression.Call(
ConnectQlFunctionsExtensions.ApplyEnumerableFunction.MakeGenericMethod(enumerableParameter.Original.Type.GenericTypeArguments[0], e.Type),
enumerableParameter.ReplaceBy,
Expression.Lambda(e, enumerableParameter.Original))),
lambda.Body),
replacements.Select(r => r.ReplaceBy));
}
return(lambda);
}
public static IFunctionRegistration AddWithoutSideEffects <TResult>([NotNull] this IConnectQlFunctions functions, string key, Expression <Func <TResult> > function)
{
var descriptor = new FunctionDescriptor(key, false, ConnectQlFunctionsExtensions.ReplaceEnumerables(functions, key, function));
return(new FunctionRegistration(descriptor, functions.AddFunction(key, descriptor)));
}
public static IFunctionRegistration6 AddWithSideEffects <TArgument1, TArgument2, TArgument3, TArgument4, TArgument5, TArgument6, TResult>([NotNull] this IConnectQlFunctions functions, string key, Expression <Func <TArgument1, TArgument2, TArgument3, TArgument4, TArgument5, TArgument6, TResult> > function)
{
var descriptor = new FunctionDescriptor(key, true, ConnectQlFunctionsExtensions.ReplaceEnumerables(functions, key, function));
return(new FunctionRegistration(descriptor, functions.AddFunction(key, descriptor)));
}
/// <summary>
/// Initializes a new instance of the <see cref="FunctionRegistration"/> class.
/// </summary>
/// <param name="descriptor">
/// The descriptor.
/// </param>
/// <param name="functions">
/// The functions.
/// </param>
internal FunctionRegistration(FunctionDescriptor descriptor, IConnectQlFunctions functions)
{
this.descriptor = descriptor;
this.functions = functions;
}