/// <summary>
/// Cancels an individual outbound pending request.
/// </summary>
/// <param name="state">The ID associated with the request to be canceled.</param>
private void CancelPendingOutboundRequest(object state)
{
Task.Run(async delegate
{
try
{
Requires.NotNull(state, nameof(state));
object id = state;
if (!this.disposed)
{
var cancellationMessage = JsonRpcMessage.CreateRequestWithNamedParameters(id: null, method: CancelRequestSpecialMethod, namedParameters: new { id = id }, parameterSerializer: DefaultJsonSerializer);
await this.TransmitAsync(cancellationMessage, this.disposeCts.Token).ConfigureAwait(false);
}
}
catch (OperationCanceledException) { }
catch (ObjectDisposedException) { }
#if DESKTOP
catch (Exception ex)
{
Debug.Fail(ex.Message, ex.ToString());
}
#else
catch (Exception)
{
}
#endif
});
}
/// <summary>
/// Invokes the specified RPC method
/// </summary>
/// <typeparam name="ReturnType">RPC method return type</typeparam>
/// <param name="id">An identifier established by the Client that MUST contain a String, Number, or NULL value if included.
/// If it is not included it is assumed to be a notification.</param>
/// <param name="targetName">Name of the method to invoke.</param>
/// <param name="arguments">Arguments to pass to the invoked method. If null, no arguments are passed.</param>
/// <param name="cancellationToken">The token whose cancellation should signal the server to stop processing this request.</param>
/// <param name="isParameterObject">Value which indicates if parameter should be passed as an object.</param>
/// <returns>A task whose result is the deserialized response from the JSON-RPC server.</returns>
protected virtual async Task <ReturnType> InvokeCoreAsync <ReturnType>(int?id, string targetName, IReadOnlyList <object> arguments, CancellationToken cancellationToken, bool isParameterObject)
{
Requires.NotNullOrEmpty(targetName, nameof(targetName));
Verify.NotDisposed(this);
cancellationToken.ThrowIfCancellationRequested();
JsonRpcMessage request;
if (isParameterObject)
{
object argument = arguments;
if (argument != null)
{
if (arguments.Count != 1 || arguments[0] == null || !arguments[0].GetType().GetTypeInfo().IsClass)
{
throw new ArgumentException(Resources.ParameterNotObject);
}
argument = arguments[0];
}
request = JsonRpcMessage.CreateRequestWithNamedParameters(id, targetName, argument, this.JsonSerializer);
}
else
{
arguments = arguments ?? EmptyObjectArray;
request = JsonRpcMessage.CreateRequest(id, targetName, arguments, this.JsonSerializer);
}
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, this.disposeCts.Token))
{
if (id == null)
{
await this.TransmitAsync(request, cts.Token).ConfigureAwait(false);
return(default(ReturnType));
}
Verify.Operation(this.readLinesTask != null, Resources.InvalidBeforeListenHasStarted);
var tcs = new TaskCompletionSource <ReturnType>();
Action <JsonRpcMessage> dispatcher = (response) =>
{
lock (this.dispatcherMapLock)
{
this.resultDispatcherMap.Remove(id.Value);
}
try
{
if (response == null)
{
tcs.TrySetCanceled();
}
else if (response.IsError)
{
tcs.TrySetException(CreateExceptionFromRpcError(response, targetName));
}
else
{
tcs.TrySetResult(response.GetResult <ReturnType>(this.JsonSerializer));
}
}
catch (Exception ex)
{
tcs.TrySetException(ex);
}
};
var callData = new OutstandingCallData(tcs, dispatcher);
lock (this.dispatcherMapLock)
{
this.resultDispatcherMap.Add(id.Value, callData);
}
await this.TransmitAsync(request, cts.Token).ConfigureAwait(false);
// Arrange for sending a cancellation message if canceled while we're waiting for a response.
using (cancellationToken.Register(this.cancelPendingOutboundRequestAction, id.Value, useSynchronizationContext: false))
{
// This task will be completed when the Response object comes back from the other end of the pipe
return(await tcs.Task.ConfigureAwait(false));
}
}
}
