Trait round_based::rounds_router::ProtocolMessage

pub trait ProtocolMessage: Sized {
    // Required method
    fn round(&self) -> u16;
}

Message of MPC protocol

MPC protocols typically consist of several rounds, each round has differently typed message. ProtocolMessage and RoundMessage traits are used to examine received message: ProtocolMessage::round determines which round message belongs to, and then RoundMessage trait can be used to retrieve actual round-specific message.

You should derive these traits using proc macro (requires derive feature):

use round_based::ProtocolMessage;

#[derive(ProtocolMessage)]
pub enum Message {
    Round1(Msg1),
    Round2(Msg2),
    // ...
}

pub struct Msg1 { /* ... */ }
pub struct Msg2 { /* ... */ }

This desugars into:

use round_based::rounds_router::{ProtocolMessage, RoundMessage};

pub enum Message {
    Round1(Msg1),
    Round2(Msg2),
    // ...
}

pub struct Msg1 { /* ... */ }
pub struct Msg2 { /* ... */ }

impl ProtocolMessage for Message {
    fn round(&self) -> u16 {
        match self {
            Message::Round1(_) => 1,
            Message::Round2(_) => 2,
            // ...
        }
    }
}
impl RoundMessage<Msg1> for Message {
    const ROUND: u16 = 1;
    fn to_protocol_message(round_message: Msg1) -> Self {
        Message::Round1(round_message)
    }
    fn from_protocol_message(protocol_message: Self) -> Result<Msg1, Self> {
        match protocol_message {
            Message::Round1(msg) => Ok(msg),
            msg => Err(msg),
        }
    }
}
impl RoundMessage<Msg2> for Message {
    const ROUND: u16 = 2;
    fn to_protocol_message(round_message: Msg2) -> Self {
        Message::Round2(round_message)
    }
    fn from_protocol_message(protocol_message: Self) -> Result<Msg2, Self> {
        match protocol_message {
            Message::Round2(msg) => Ok(msg),
            msg => Err(msg),
        }
    }
}

Required Methods

fn round(&self) -> u16

Number of round this message originates from

Object Safety

This trait is not object safe.

Implementors