/// <summary>
/// Invokes the method with the specified parameters, returns the result of the method
/// </summary>
/// <exception cref="RpcInvalidParametersException">Thrown when conversion of parameters fails or when invoking the method is not compatible with the parameters</exception>
/// <param name="parameters">List of parameters to invoke the method with</param>
/// <returns>The result of the invoked method</returns>
private async Task <object> InvokeAsync(RpcMethodInfo methodInfo, RpcPath path)
{
object obj = null;
if (this.serviceProvider != null)
{
//Use service provider (if exists) to create instance
var objectFactory = ActivatorUtilities.CreateFactory(methodInfo.Method.DeclaringType, new Type[0]);
obj = objectFactory(this.serviceProvider, null);
}
if (obj == null)
{
//Use reflection to create instance if service provider failed or is null
obj = Activator.CreateInstance(methodInfo.Method.DeclaringType);
}
try
{
object returnObj = methodInfo.Method.Invoke(obj, methodInfo.ConvertedParameters);
returnObj = await DefaultRpcInvoker.HandleAsyncResponses(returnObj);
return(returnObj);
}
catch (TargetInvocationException ex)
{
var routeInfo = new RpcRouteInfo(methodInfo, path, this.serviceProvider);
//Controller error handling
RpcErrorFilterAttribute errorFilter = methodInfo.Method.DeclaringType.GetTypeInfo().GetCustomAttribute <RpcErrorFilterAttribute>();
if (errorFilter != null)
{
OnExceptionResult result = errorFilter.OnException(routeInfo, ex.InnerException);
if (!result.ThrowException)
{
return(result.ResponseObject);
}
if (result.ResponseObject is Exception rEx)
{
throw rEx;
}
}
throw new RpcUnknownException("Exception occurred from target method execution.", ex);
}
catch (Exception ex)
{
throw new RpcInvalidParametersException("Exception from attempting to invoke method. Possibly invalid parameters for method.", ex);
}
}
/// <summary>
/// Finds the matching Rpc method for the current request
/// </summary>
/// <param name="route">Rpc route for the current request</param>
/// <param name="request">Current Rpc request</param>
/// <param name="parameterList">Paramter list parsed from the request</param>
/// <param name="serviceProvider">(Optional)IoC Container for rpc method controllers</param>
/// <param name="jsonSerializerSettings">Json serialization settings that will be used in serialization and deserialization for rpc requests</param>
/// <returns>The matching Rpc method to the current request</returns>
private RpcMethod GetMatchingMethod(RpcRoute route, RpcRequest request, out object[] parameterList, IServiceProvider serviceProvider = null, JsonSerializerSettings jsonSerializerSettings = null)
{
if (route == null)
{
throw new ArgumentNullException(nameof(route));
}
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
this.logger?.LogDebug($"Attempting to match Rpc request to a method '{request.Method}'");
List <RpcMethod> methods = DefaultRpcInvoker.GetRpcMethods(route, serviceProvider, jsonSerializerSettings);
//Case insenstive check for hybrid approach. Will check for case sensitive if there is ambiguity
methods = methods
.Where(m => string.Equals(m.Method, request.Method, StringComparison.OrdinalIgnoreCase))
.ToList();
RpcMethod rpcMethod = null;
parameterList = null;
int originalMethodCount = methods.Count;
if (methods.Count > 0)
{
List <RpcMethod> potentialMatches = new List <RpcMethod>();
foreach (RpcMethod method in methods)
{
bool matchingMethod;
if (request.ParameterMap != null)
{
matchingMethod = method.HasParameterSignature(request.ParameterMap, out parameterList);
}
else
{
matchingMethod = method.HasParameterSignature(request.ParameterList, out parameterList);
}
if (matchingMethod)
{
potentialMatches.Add(method);
}
}
if (potentialMatches.Count > 1)
{
//Try to remove ambiguity with case sensitive check
potentialMatches = potentialMatches
.Where(m => string.Equals(m.Method, request.Method, StringComparison.Ordinal))
.ToList();
if (potentialMatches.Count != 1)
{
this.logger?.LogError("More than one method matched the rpc request. Unable to invoke due to ambiguity.");
throw new RpcMethodNotFoundException();
}
}
if (potentialMatches.Count == 1)
{
rpcMethod = potentialMatches.First();
}
}
if (rpcMethod == null)
{
this.logger?.LogError("No methods matched request.");
throw new RpcMethodNotFoundException();
}
this.logger?.LogDebug("Request was matched to a method");
return(rpcMethod);
}
/// <summary>
/// Finds the matching Rpc method for the current request
/// </summary>
/// <param name="route">Rpc route for the current request</param>
/// <param name="request">Current Rpc request</param>
/// <param name="parameterList">Paramter list parsed from the request</param>
/// <param name="serviceProvider">(Optional)IoC Container for rpc method controllers</param>
/// <param name="jsonSerializerSettings">Json serialization settings that will be used in serialization and deserialization for rpc requests</param>
/// <returns>The matching Rpc method to the current request</returns>
private RpcMethod GetMatchingMethod(RpcRoute route, RpcRequest request, out object[] parameterList, IServiceProvider serviceProvider = null, JsonSerializerSettings jsonSerializerSettings = null)
{
if (route == null)
{
throw new ArgumentNullException(nameof(route));
}
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
this.Logger?.LogDebug($"Attempting to match Rpc request to a method '{request.Method}'");
List <RpcMethod> methods = DefaultRpcInvoker.GetRpcMethods(route, serviceProvider, jsonSerializerSettings);
methods = methods
.Where(m => string.Equals(m.Method, request.Method, StringComparison.OrdinalIgnoreCase))
.ToList();
RpcMethod rpcMethod = null;
parameterList = null;
if (methods.Count > 1)
{
foreach (RpcMethod method in methods)
{
bool matchingMethod;
if (request.ParameterMap != null)
{
matchingMethod = method.HasParameterSignature(request.ParameterMap, out parameterList);
}
else
{
matchingMethod = method.HasParameterSignature(request.ParameterList);
parameterList = request.ParameterList;
}
if (matchingMethod)
{
if (rpcMethod != null) //If already found a match
{
throw new RpcAmbiguousMethodException();
}
rpcMethod = method;
}
}
}
else if (methods.Count == 1)
{
//Only signature check for methods that have the same name for performance reasons
rpcMethod = methods.First();
if (request.ParameterMap != null)
{
bool signatureMatch = rpcMethod.TryParseParameterList(request.ParameterMap, out parameterList);
if (!signatureMatch)
{
throw new RpcMethodNotFoundException();
}
}
else
{
parameterList = request.ParameterList;
}
}
if (rpcMethod == null)
{
throw new RpcMethodNotFoundException();
}
this.Logger?.LogDebug("Request was matched to a method");
return(rpcMethod);
}