Cothority ONET Causal Message propogation and sending a map in a message

[Pasindu Tennage]

Dear Team Cothority,

I have two questions regarding the ONET framework.

1. I am using the rawSend() method of service to send messages among services. Is there an inbuilt functionality in ONET and Cothority to implement Causal message propagation among a set of nodes? 

2. Is there a way to send an array of messages of a specific type (type described in a struct) using rawSend? for example I am trying to send a message of the following type using RawSend()

type CatchUpMessage struct {
   Id                                 *network.ServerIdentity
   Step                               int
   RecievedThresholdwitnessedMessages map[int][]*WitnessedMessage
}

But the runtime complains that "protobuf: map only support []byte or string as repeated value"

[Gasser Linus]

Hi Tennage,

Thanks for your interest in the onet framework. Can you explain a little bit more what you’re trying to achieve? Are you currently working in the DEDIS lab?

Did you already read through https://github.com/dedis/onet#components ? Are you trying to create a protocol? A service?

There is a template available here: https://github.com/dedis/cothority_template - it shows how to use the different components of onet.

RawSend should only be used for short messages that don’t need any answer. If you need an answer, you should write a protocol.

With regard to your question 2., you ran into a restriction of protobuf, and the way it is implemented in dedis/protobuf. The problem comes from the `map[int][]*WitnessedMessage`. Protobuf only supports `map[x][]byte` and map[x]string`. So you have to put the `[]*WitnessedMessage` in its own structure, and it should work.

Best,

Linus

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Mr. Linus Gasser Lead Developer +41 21 693 6770 linus....@epfl.ch   EPFL – C4DT | Station 14 CH – 1015 Lausanne www.c4dt.org