Write a thrift server in scala using scrooge and client in python or ruby

Question

I want to write a thrift service implementation in Scala (using Scrooge) but without the use of Finagle, since I couldn't write a ruby/python client for Finagle servers. The problem is that with scrooge the service doesn't seem to implement "Processor" class.

Assume I have a thrift definition like this:

service TestService {
   void testFunction(1: string message);
}

and I generated the scala files using scrooge, when I tried to use the standard implementation of thrift for scala with that to run the server:

val st = new TServerSocket(9999)
val processor = new TestService.Processor(new TestServiceImpl)
val arg = new TThreadPoolServer.Args(st)
arg.processor(processor) 
val server = new TThreadPoolServer(arg)
server.serve()

The generated TestService object doesn't seem to have the Processor inner class. Any idea how to do that without Finagle? or as another solution, how to write a python or ruby client to finagle thrift servers?

Answer 1

You must use the finagle thrift implementation with Scrooge. Note that it is all wire and IDL compatible, so you can use whatever implementations you want, given that you share the IDL.

You can write Ruby or Python clients for the finagle thrift service: it speaks the same protocol.

Answer 2

Based on the project you linked to, it appears that you have a transport mismatch between client and server.

Your python client is using the buffered transport:

transport = TTransport.TBufferedTransport(transport)

But your scala server is using the framed transport:

.codec(ThriftServerFramedCodec())

If you change the python client to use the framed transport, your issue should go away:

transport = TTransport.TFramedTransport(transport)