mpstthree 0.1.17

A library implementing Multiparty Session Types for 2 or more participants
Documentation 
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// Test for parametrisation on the number of roles
use rand::{thread_rng, Rng};

use mpstthree::binary::struct_trait::{end::End, recv::Recv, send::Send, session::Session};
use mpstthree::role::broadcast::RoleBroadcast;
use mpstthree::role::end::RoleEnd;
use mpstthree::{choose_mpst_multi_to_all, generate};
use std::error::Error;
use std::marker;

// Create new roles
generate!("basic", MeshedChannels, A, B, D);

// Test our usecase
// Simple types
// Client = D
// Authenticator = A
// Server = B

type AtoDClose = End;
type AtoBClose = End;
type AtoBVideo<N> = Send<N, Recv<N, End>>;
type AtoDVideo<N> = Recv<N, Send<N, RecursAtoD<N>>>;

type InitA<N> = Recv<N, Send<N, RecursAtoD<N>>>;

type BtoAClose = <AtoBClose as Session>::Dual;
type BtoDClose = End;
type BtoAVideo<N> = <AtoBVideo<N> as Session>::Dual;

type RecursAtoD<N> = <Choose0fromCtoA<N> as Session>::Dual;
type RecursBtoD<N> = <Choose0fromCtoB<N> as Session>::Dual;

enum Branches0AtoD<N: marker::Send> {
    End(MeshedChannels<AtoBClose, AtoDClose, StackAEnd, NameA>),
    Video(MeshedChannels<AtoBVideo<N>, AtoDVideo<N>, StackAVideo, NameA>),
}
enum Branches0BtoD<N: marker::Send> {
    End(MeshedChannels<BtoAClose, BtoDClose, StackBEnd, NameB>),
    Video(MeshedChannels<BtoAVideo<N>, RecursBtoD<N>, StackBVideo, NameB>),
}
type Choose0fromCtoA<N> = Send<Branches0AtoD<N>, End>;
type Choose0fromCtoB<N> = Send<Branches0BtoD<N>, End>;

type InitD<N> = Send<N, Recv<N, Choose0fromCtoA<N>>>;

// Stacks
type StackAEnd = RoleEnd;
type StackAVideo = RoleD<RoleB<RoleB<RoleD<RoleD<RoleEnd>>>>>;
type StackARecurs = RoleD<RoleEnd>;
type StackAInit = RoleD<RoleD<RoleD<RoleEnd>>>;

type StackBEnd = RoleEnd;
type StackBVideo = RoleA<RoleA<RoleD<RoleEnd>>>;
type StackBRecurs = RoleD<RoleEnd>;

type StackDRecurs = RoleBroadcast;
type StackDFull = RoleA<RoleA<StackDRecurs>>;

// Creating the MP sessions
// For D
type EndpointDVideo<N> = MeshedChannels<
    <AtoDVideo<N> as Session>::Dual,
    <RecursBtoD<N> as Session>::Dual,
    RoleA<RoleA<RoleBroadcast>>,
    NameD,
>;
type EndpointDRecurs<N> =
    MeshedChannels<Choose0fromCtoA<N>, Choose0fromCtoB<N>, StackDRecurs, NameD>;
type EndpointDFull<N> = MeshedChannels<InitD<N>, Choose0fromCtoB<N>, StackDFull, NameD>;

// For A
type EndpointARecurs<N> = MeshedChannels<End, RecursAtoD<N>, StackARecurs, NameA>;
type EndpointAFull<N> = MeshedChannels<End, InitA<N>, StackAInit, NameA>;

// For B
type EndpointBRecurs<N> = MeshedChannels<End, RecursBtoD<N>, StackBRecurs, NameB>;

// Functions related to endpoints
fn server(s: EndpointBRecurs<i32>) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, {
        Branches0BtoD::End(s) => {
            s.close()
        },
        Branches0BtoD::Video(s) => {
            let (request, s) = s.recv();
            let s = s.send(request + 1);
            server(s)
        },
    })
}

fn authenticator(s: EndpointAFull<i32>) -> Result<(), Box<dyn Error>> {
    let (id, s) = s.recv();
    let s = s.send(id + 1);

    authenticator_recurs(s)
}

fn authenticator_recurs(s: EndpointARecurs<i32>) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, {
        Branches0AtoD::End(s) => {
            s.close()
        },
        Branches0AtoD::Video(s) => {
            let (request, s) = s.recv();
            let (video, s) = s.send(request + 1).recv();
            let s = s.send(video + 1);
            authenticator_recurs(s)
        },
    })
}

fn client(s: EndpointDFull<i32>) -> Result<(), Box<dyn Error>> {
    let mut rng = thread_rng();
    let xs: Vec<i32> = (1..100).map(|_| rng.gen()).collect();

    let (_, s) = s.send(0).recv();

    client_recurs(s, xs, 1)
}

fn client_recurs(
    s: EndpointDRecurs<i32>,
    mut xs: Vec<i32>,
    index: i32,
) -> Result<(), Box<dyn Error>> {
    match xs.pop() {
        Option::Some(_) => {
            let s: EndpointDVideo<i32> = choose_mpst_multi_to_all!(
                s,
                Branches0AtoD::Video,
                Branches0BtoD::Video, =>
                NameD,
                MeshedChannels,
                3
            );

            let (_, s) = s.send(1).recv();

            client_recurs(s, xs, index + 1)
        }
        Option::None => {
            let s = choose_mpst_multi_to_all!(
                s,
                Branches0AtoD::End,
                Branches0BtoD::End, =>
                NameD,
                MeshedChannels,
                3
            );

            assert_eq!(index, 100);

            s.close()
        }
    }
}

////////////////////////////////////////

pub fn new_run_usecase_recursive() {
    let (thread_a, thread_b, thread_c) = fork_mpst(authenticator, server, client);

    assert!(thread_a.join().is_ok());
    assert!(thread_b.join().is_ok());
    assert!(thread_c.join().is_ok());
}