public async Task <HelloResponse> SayHello(HelloRequest request, CancellationToken ct, GrainCallOptions options = null)
{
options = options ?? GrainCallOptions.Default;
var gr = new GrainRequest
{
MethodIndex = 0,
MessageData = request.ToByteString()
};
async Task <HelloResponse> Inner()
{
//resolve the grain
var(pid, statusCode) = await _cluster.GetAsync(_id, "HelloGrain", ct);
if (statusCode != ResponseStatusCode.OK)
{
throw new Exception($"Get PID failed with StatusCode: {statusCode}");
}
//request the RPC method to be invoked
var res = await _cluster.System.Root.RequestAsync <object>(pid, gr, ct);
//did we get a response?
if (res is GrainResponse grainResponse)
{
return(HelloResponse.Parser.ParseFrom(grainResponse.MessageData));
}
//did we get an error response?
if (res is GrainErrorResponse grainErrorResponse)
{
throw new Exception(grainErrorResponse.Err);
}
throw new NotSupportedException();
}
for (int i = 0; i < options.RetryCount; i++)
{
try
{
return(await Inner());
}
catch (Exception)
{
if (options.RetryAction != null)
{
await options.RetryAction(i);
}
}
}
return(await Inner());
}
public async Task <HelloResponse> SayHello(HelloRequest request, CancellationToken ct)
{
var gr = new GrainRequest
{
MethodIndex = 0,
MessageData = request.ToByteString()
};
async Task <HelloResponse> Inner()
{
//resolve the grain
var(pid, statusCode) = await Cluster.GetAsync(_id, "HelloGrain", ct);
if (statusCode != ResponseStatusCode.OK)
{
throw new Exception($"Get PID failed with StatusCode: {statusCode}");
}
//request the RPC method to be invoked
var res = await pid.RequestAsync <object>(gr, ct);
//did we get a response?
if (res is GrainResponse grainResponse)
{
return(HelloResponse.Parser.ParseFrom(grainResponse.MessageData));
}
//did we get an error response?
if (res is GrainErrorResponse grainErrorResponse)
{
throw new Exception(grainErrorResponse.Err);
}
throw new NotSupportedException();
}
for (int i = 0; i < 4; i++)
{
try
{
return(await Inner());
}
catch (Exception x)
{
//ignore, TODO: exponential backoff?
}
}
return(await Inner());
}
public async Task <HelloResponse> SayHello(HelloRequest request)
{
var pid = await Cluster.GetAsync(_id, "HelloGrain");
var gr = new GrainRequest
{
Method = "SayHello",
MessageData = request.ToByteString()
};
var res = await pid.RequestAsync <object>(gr);
if (res is GrainResponse grainResponse)
{
return(HelloResponse.Parser.ParseFrom(grainResponse.MessageData));
}
if (res is GrainErrorResponse grainErrorResponse)
{
throw new Exception(grainErrorResponse.Err);
}
throw new NotSupportedException();
}