mpstthree 0.1.17

A library implementing Multiparty Session Types for 2 or more participants
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127

#![allow(clippy::type_complexity, clippy::too_many_arguments, clippy::large_enum_variant)]

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::{
    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, 2);

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

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

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

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

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

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

// Types
// A
enum Branching0fromBtoA {
    Forward(MeshedChannels<Send<(), RecursAtoB>, RoleB<RoleB<RoleEnd>>, NameA>),
    Backward(MeshedChannels<Recv<(), RecursAtoB>, RoleB<RoleB<RoleEnd>>, NameA>),
    Done(MeshedChannels<End, RoleEnd, NameA>),
}
type RecursAtoB = <Choose0fromBtoA as Session>::Dual;

// B
type Choose0fromBtoA = Send<Branching0fromBtoA, End>;
type EndpointDoneB = MeshedChannels<End, RoleEnd, NameB>;
type EndpointForwardB = MeshedChannels<Recv<(), Choose0fromBtoA>, RoleA<RoleBroadcast>, NameB>;
type EndpointBackwardB = MeshedChannels<Send<(), Choose0fromBtoA>, RoleA<RoleBroadcast>, NameB>;

// Creating the MP sessions
type EndpointA = MeshedChannels<RecursAtoB, RoleB<RoleEnd>, NameA>;
type EndpointB = MeshedChannels<Choose0fromBtoA, RoleBroadcast, NameB>;

create_fn_choose_mpst_multi_to_all_bundle!(
    done_from_b_to_all, forward_from_b_to_all, backward_from_b_to_all, =>
    Done, Forward, Backward, =>
    EndpointDoneB, EndpointForwardB, EndpointBackwardB, =>
    Branching0fromBtoA, =>
    NameA, =>
    NameB, MeshedChannels, 2
);

fn endpoint_a(s: EndpointA) -> Result<(), Box<dyn Error>> {
    offer_mpst!(s, recv_mpst_a_from_b, {
        Branching0fromBtoA::Done(s) => {
            close_mpst_multi(s)
        },
        Branching0fromBtoA::Forward(s) => {
            let s = send_mpst_a_to_b((), s)?;
            endpoint_a(s)
        },
        Branching0fromBtoA::Backward(s) => {
            let (_, s) = recv_mpst_a_from_b(s)?;
            endpoint_a(s)
        },
    })
}

fn endpoint_b(s: EndpointB) -> Result<(), Box<dyn Error>> {
    recurs_b(s, 100)
}

fn recurs_b(s: EndpointB, index: i64) -> Result<(), Box<dyn Error>> {
    match index {
        0 => {
            let s = done_from_b_to_all(s);

            close_mpst_multi(s)
        }
        i if i % 2 == 0 => {
            let s = forward_from_b_to_all(s);

            let (_, s) = recv_mpst_b_from_a(s)?;

            recurs_b(s, i - 1)
        }
        i => {
            let s = backward_from_b_to_all(s);

            let s = send_mpst_b_to_a((), s)?;

            recurs_b(s, i - 1)
        }
    }
}

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

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