mpstthree 0.1.17

A library implementing Multiparty Session Types for 2 or more participants
Documentation 
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use mpstthree::binary::struct_trait::{end::End, recv::Recv, send::Send};
use mpstthree::generate;
use mpstthree::role::broadcast::RoleBroadcast;
use mpstthree::role::end::RoleEnd;

use rand::{random, thread_rng, Rng};

use std::error::Error;

// See the folder scribble_protocols for the related Scribble protocol

// Create the new MeshedChannels for three participants and the close and fork functions
generate!("recursive", MeshedChannels, Client, Other, Server,);

// Types
// SERVER
type Choose0fromServerToClient = Send<Branching0fromServerToClient, End>;
type Choose0fromServerToOther = Send<Branching0fromServerToOther, End>;

// CLIENT
enum Branching0fromServerToClient {
    Dummy(MeshedChannels<End, Recv<(i32, i32), End>, RoleServer<RoleEnd>, NameClient>),
    Query(MeshedChannels<End, Recv<(i32, i32), End>, RoleServer<RoleEnd>, NameClient>),
}

// OTHER
enum Branching0fromServerToOther {
    Dummy(MeshedChannels<End, Recv<(), End>, RoleServer<RoleEnd>, NameOther>),
    Query(
        MeshedChannels<
            End,
            Recv<(i32, i32), Send<(i32, i32), End>>,
            RoleServer<RoleServer<RoleEnd>>,
            NameOther,
        >,
    ),
}

// Creating the MP sessions
// CLIENT
type EndpointClient = MeshedChannels<
    End,
    Send<i32, Recv<Branching0fromServerToClient, End>>,
    RoleServer<RoleServer<RoleEnd>>,
    NameClient,
>;

// OTHER
type EndpointOther =
    MeshedChannels<End, Recv<Branching0fromServerToOther, End>, RoleServer<RoleEnd>, NameOther>;

// SERVER
type EndpointQuery = MeshedChannels<
    Send<(i32, i32), End>,
    Send<(i32, i32), Recv<(i32, i32), End>>,
    RoleOther<RoleOther<RoleClient<RoleEnd>>>,
    NameServer,
>;
type EndpointDummy = MeshedChannels<
    Send<(i32, i32), End>,
    Send<(), End>,
    RoleOther<RoleClient<RoleEnd>>,
    NameServer,
>;
type EndpointServer = MeshedChannels<
    Recv<i32, Choose0fromServerToClient>,
    Choose0fromServerToOther,
    RoleClient<RoleBroadcast>,
    NameServer,
>;

// Functions
fn endpoint_client(s: EndpointClient) -> Result<(), Box<dyn Error>> {
    let address = random::<i32>();

    let s = s.send(address);

    offer_mpst!(s, {
        Branching0fromServerToClient::Dummy(s) => {

            let (_, s) = s.recv();

            s.close()
        },
        Branching0fromServerToClient::Query(s) => {

            let ((_new_address, _new_packet), s) = s.recv();

            s.close()
        },
    })
}

fn endpoint_other(s: EndpointOther) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, {
        Branching0fromServerToOther::Dummy(s) => {
            let (_, s) = s.recv();
            s.close()
        },
        Branching0fromServerToOther::Query(s) => {
            let ((address, packet), s) = s.recv();

            let s = s.send((-address, -packet));

            s.close()
        },
    })
}

fn endpoint_server(s: EndpointServer) -> Result<(), Box<dyn Error>> {
    let choice: i32 = thread_rng().gen_range(1..3);

    let (address, s) = s.recv();

    if choice == 1 {
        let s: EndpointDummy = choose_mpst_server_to_all!(
            s,
            Branching0fromServerToClient::Dummy,
            Branching0fromServerToOther::Dummy
        );

        let s = s.send(());

        let packet = random::<i32>();

        let s = s.send((address, packet));

        s.close()
    } else {
        let s: EndpointQuery = choose_mpst_server_to_all!(
            s,
            Branching0fromServerToClient::Query,
            Branching0fromServerToOther::Query
        );

        let packet = random::<i32>();

        let s = s.send((address, packet));

        let ((new_address, new_packet), s) = s.recv();

        let s = s.send((new_address, new_packet));

        s.close()
    }
}

fn main() {
    let (thread_other, thread_server, thread_client) =
        fork_mpst(endpoint_client, endpoint_other, endpoint_server);

    thread_client.join().unwrap();
    thread_server.join().unwrap();
    thread_other.join().unwrap();
}