mpstthree 0.1.17

A library implementing Multiparty Session Types for 2 or more participants
Documentation 
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#![allow(clippy::type_complexity, clippy::too_many_arguments, clippy::large_enum_variant)]

use mpstthree::binary::struct_trait::{end::End, recv::Recv, send::Send};
use mpstthree::role::broadcast::RoleBroadcast;
use mpstthree::role::end::RoleEnd;
use mpstthree::{
    bundle_struct_fork_close_multi_cancel, create_fn_choose_mpst_multi_to_all_bundle,
    create_multiple_normal_role_short, create_recv_mpst_session_bundle,
    create_send_mpst_cancel_bundle, offer_mpst, create_multiple_normal_name_short
};

use std::error::Error;

// Create the new MeshedChannels for three participants and the close and fork functions
bundle_struct_fork_close_multi_cancel!(close_mpst_multi, fork_mpst, MeshedChannels, 3);

// Create new roles
// normal
create_multiple_normal_role_short!(A, B, C);

// Create new names
create_multiple_normal_name_short!(A, B, C);

// Create new send functions
// A
create_send_mpst_cancel_bundle!(
    send_mpst_a_to_b, RoleB, 1 |
    send_mpst_a_to_c, RoleC, 2 | =>
    NameA, MeshedChannels, 3
);

// B
create_send_mpst_cancel_bundle!(
    send_mpst_b_to_a, RoleA, 1 |
    send_mpst_b_to_c, RoleC, 2 | =>
    NameB, MeshedChannels, 3
);

// C
create_send_mpst_cancel_bundle!(
    send_mpst_c_to_a, RoleA, 1 |
    send_mpst_c_to_b, RoleB, 2 | =>
    NameC, MeshedChannels, 3
);

// Create new recv functions and related types
// A
create_recv_mpst_session_bundle!(
    recv_mpst_a_from_b, RoleB, 1 |
    recv_mpst_a_from_c, RoleC, 2 | =>
    NameA, MeshedChannels, 3
);

// B
create_recv_mpst_session_bundle!(
    recv_mpst_b_from_a, RoleA, 1 |
    recv_mpst_b_from_c, RoleC, 2 | =>
    NameB, MeshedChannels, 3
);

// C
create_recv_mpst_session_bundle!(
    recv_mpst_c_from_a, RoleA, 1 |
    recv_mpst_c_from_b, RoleB, 2 | =>
    NameC, MeshedChannels, 3
);

// Types
// Send/Recv
type RS = Recv<(), Send<(), End>>;
type SR = Send<(), Recv<(), End>>;

// Roles
type R2A<R> = RoleA<RoleA<R>>;
type R2B<R> = RoleB<RoleB<R>>;
type R2C<R> = RoleC<RoleC<R>>;

// A
enum Branching0fromCtoA {
    More(MeshedChannels<RS, Recv<(), Send<(), RecursAtoC>>, R2C<R2B<RoleC<RoleEnd>>>, NameA>),
    Done(MeshedChannels<End, End, RoleEnd, NameA>),
}
type RecursAtoC = Recv<Branching0fromCtoA, End>;

// B
enum Branching0fromCtoB {
    More(MeshedChannels<SR, Recv<(), Send<(), RecursBtoC>>, R2C<R2A<RoleC<RoleEnd>>>, NameB>),
    Done(MeshedChannels<End, End, RoleEnd, NameB>),
}
type RecursBtoC = Recv<Branching0fromCtoB, End>;

// C
type Choose0fromCtoA = Send<Branching0fromCtoA, End>;
type Choose0fromCtoB = Send<Branching0fromCtoB, End>;
type EndpointDoneC = MeshedChannels<End, End, RoleEnd, NameC>;
type EndpointMoreC = MeshedChannels<
    Send<(), Recv<(), Choose0fromCtoA>>,
    Send<(), Recv<(), Choose0fromCtoB>>,
    R2A<R2B<RoleBroadcast>>,
    NameC,
>;

// Creating the MP sessions
type EndpointA = MeshedChannels<End, RecursAtoC, RoleC<RoleEnd>, NameA>;
type EndpointB = MeshedChannels<End, RecursBtoC, RoleC<RoleEnd>, NameB>;
type EndpointC = MeshedChannels<Choose0fromCtoA, Choose0fromCtoB, RoleBroadcast, NameC>;

create_fn_choose_mpst_multi_to_all_bundle!(
    done_from_c_to_all, more_from_c_to_all, =>
    Done, More, =>
    EndpointDoneC, EndpointMoreC, =>
    Branching0fromCtoA, Branching0fromCtoB, =>
    NameA, NameB, =>
    NameC, MeshedChannels, 3
);

fn endpoint_a(s: EndpointA) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, recv_mpst_a_from_c, {
        Branching0fromCtoA::Done(s) => {
            close_mpst_multi(s)
        },
        Branching0fromCtoA::More(s) => {
            let (_, s) = recv_mpst_a_from_c(s)?;
            let s = send_mpst_a_to_c((), s)?;
            let (_, s) = recv_mpst_a_from_b(s)?;
            let s = send_mpst_a_to_b((), s)?;
            endpoint_a(s)
        },
    })
}

fn endpoint_b(s: EndpointB) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, recv_mpst_b_from_c, {
        Branching0fromCtoB::Done(s) => {
            close_mpst_multi(s)
        },
        Branching0fromCtoB::More(s) => {
            let (_, s) = recv_mpst_b_from_c(s)?;
            let s = send_mpst_b_to_c((), s)?;
            let s = send_mpst_b_to_a((), s)?;
            let (_, s) = recv_mpst_b_from_a(s)?;
            endpoint_b(s)
        },
    })
}

fn endpoint_c(s: EndpointC) -> Result<(), Box<dyn Error>> {
    recurs_c(s, 100)
}

fn recurs_c(s: EndpointC, index: i64) -> Result<(), Box<dyn Error>> {
    match index {
        0 => {
            let s = done_from_c_to_all(s);

            close_mpst_multi(s)
        }
        i => {
            let s = more_from_c_to_all(s);

            let s = send_mpst_c_to_a((), s)?;
            let (_, s) = recv_mpst_c_from_a(s)?;
            let s = send_mpst_c_to_b((), s)?;
            let (_, s) = recv_mpst_c_from_b(s)?;

            recurs_c(s, i - 1)
        }
    }
}

fn main() {
    let (thread_a, thread_b, thread_c) = fork_mpst(endpoint_a, endpoint_b, endpoint_c);

    thread_a.join().unwrap();
    thread_b.join().unwrap();
    thread_c.join().unwrap();
}