private void HandleMessage(string message)
{
List <object> data = JsonConvert.DeserializeObject <List <object> >(message);
string msgType = (string)data[0];
if (msgType == "call-reply")
{
int callID = Convert.ToInt32(data[1]);
if (ActiveCalls.ContainsKey(callID))
{
bool success = (bool)data[2];
object retValOrException = data[3];
ActiveCalls[callID].SetResult(success ? "result" : "exception",
retValOrException);
}
else
{
throw new Error(ErrorCode.CONNECTION_ERROR,
"Received a response for an unrecognized call id: " + callID);
}
}
else if (msgType == "call")
{
int callID = Convert.ToInt32(data[1]);
string methodName = (string)data[2];
if (RegisteredFunctions.ContainsKey(methodName))
{
Delegate nativeMethod = RegisteredFunctions[methodName];
ParameterInfo[] paramInfo = nativeMethod.Method.GetParameters();
if (paramInfo.Length != data.Count - 3)
{
throw new Error(ErrorCode.INVALID_ARGUMENT,
"Incorrect number of arguments for method: " + methodName +
". Expected: " + paramInfo.Length + ". Got: " +
(data.Count - 3));
}
List <object> parameters = new List <object>();
for (int i = 0; i < paramInfo.Length; i++)
{
parameters.Add(ConversionUtils.CastJObject(
data[i + 3], paramInfo[i].ParameterType));
}
object returnValue = null;
object exception = null;
bool success = true;
try
{
returnValue = nativeMethod.DynamicInvoke(parameters.ToArray());
}
catch (Exception e)
{
exception = e;
success = false;
}
if (!IsOneWay(methodName))
{
// Send call-reply message.
List <object> callReplyMessage = new List <object>();
callReplyMessage.Add("call-reply");
callReplyMessage.Add(callID);
callReplyMessage.Add(success);
if (!success)
{
callReplyMessage.Add(exception);
}
else if (nativeMethod.Method.ReturnType != typeof(void))
{
callReplyMessage.Add(returnValue);
}
Connection.Send(JsonConvert.SerializeObject(callReplyMessage));
}
}
else
{
throw new Error(ErrorCode.CONNECTION_ERROR,
"Received a call for an unregistered method: " + methodName);
}
}
else
{
throw new Error(ErrorCode.CONNECTION_ERROR, "Unknown message type: " + msgType);
}
}
internal void SetResult(string eventName, object argument)
{
// TODO(rryk): Handle the case when result/error/exception arrives before the handlers
// are set. Essentially this involves setting a flag that we do have a result and
// calling the callbacks immediately after they are added via On(...) method.
if (eventName == "result")
{
// Cast return object to a specific type accepted by each individual result handler.
foreach (Delegate resultDelegate in OnResult)
{
Type retValueType = resultDelegate.Method.GetParameters()[0].ParameterType;
resultDelegate.DynamicInvoke(
ConversionUtils.CastJObject(argument, retValueType));
}
foreach (Delegate excResultDelegate in OnExcResult)
{
Type retValueType = excResultDelegate.Method.GetParameters()[1].ParameterType;
excResultDelegate.DynamicInvoke(
null, ConversionUtils.CastJObject(argument, retValueType));
}
}
else if (eventName == "exception")
{
// Cast exception object to a specific type accepted by each individual result
// handler.
foreach (Delegate exceptionDelegate in OnException)
{
Type retValueType = exceptionDelegate.Method.GetParameters()[0].ParameterType;
exceptionDelegate.DynamicInvoke(
ConversionUtils.CastJObject(argument, retValueType));
}
foreach (Delegate excResultDelegate in OnExcResult)
{
Type exceptionType = excResultDelegate.Method.GetParameters()[0].ParameterType;
excResultDelegate.DynamicInvoke(
ConversionUtils.CastJObject(argument, exceptionType), null);
}
// If no handlers are set, yet exception was returned - raise it.
if (OnException.Count == 0 && OnExcResult.Count == 0)
{
throw new Error(ErrorCode.GENERIC_ERROR, "Received unhandled exception from " +
"the remote end: " + argument.ToString());
}
}
else if (eventName == "error")
{
if (argument.GetType() != typeof(string))
{
throw new Error(ErrorCode.INVALID_ARGUMENT,
"Argument for 'error' event must be a string");
}
OnError((string)argument);
}
else
{
throw new Error(ErrorCode.INVALID_ARGUMENT, "Invalid event name: " + eventName);
}
}
