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::generate;
use mpstthree::role::broadcast::RoleBroadcast;
use mpstthree::role::end::RoleEnd;

use std::error::Error;

static LOOPS: i64 = 100;

// Create new roles
generate!("rec_and_cancel", MeshedChannels, A, B, C);

// 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 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>;

fn endpoint_a(s: EndpointA) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, {
        Branching0fromCtoA::Done(s) => {
            s.close()
        },
        Branching0fromCtoA::More(s) => {
            let (_, s) = s.recv()?;
            let s = s.send(())?;
            let (_, s) = s.recv()?;
            let s = s.send(())?;
            endpoint_a(s)
        },
    })
}

#[inline]
fn endpoint_b(s: EndpointB) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, {
        Branching0fromCtoB::Done(s) => {
            s.close()
        },
        Branching0fromCtoB::More(s) => {
            let (_, s) = s.recv()?;
            let s = s.send(())?;
            let s = s.send(())?;
            let (_, s) = s.recv()?;
            endpoint_b(s)
        },
    })
}

#[inline]
fn endpoint_c(s: EndpointC) -> Result<(), Box<dyn Error>> {
    let mut temp_s = s;

    for _ in 1..LOOPS {
        temp_s = recurs_c(temp_s)?;
    }

    let s = choose_mpst_c_to_all!(temp_s, Branching0fromCtoA::Done, Branching0fromCtoB::Done);

    s.close()
}

fn recurs_c(s: EndpointC) -> Result<EndpointC, Box<dyn Error>> {
    let s: EndpointMoreC =
        choose_mpst_c_to_all!(s, Branching0fromCtoA::More, Branching0fromCtoB::More);

    let s = s.send(())?;
    let (_, s) = s.recv()?;
    let s = s.send(())?;
    let (_, s) = s.recv()?;
    Ok(s)
}

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();
}