tla-rs 0.1.0

Rust implementation of the IronFleet verified distributed systems framework
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
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246

#![allow(unused_imports)]
use std::net;

use builtin::*;
use builtin_macros::*;
use vstd::{modes::*, prelude::*, seq::*, *};

use crate::common::collections::seq_is_unique_v::{endpoints_contain, seq_is_unique};
use crate::common::framework::environment_s::*;
use crate::common::native::io_s::{abstractify_end_points, EndPoint};
use crate::common::native::io_s::{AbstractEndPoint, NetClient, NetEvent};
use crate::implementation::lock::message_i::*;
use crate::implementation::lock::netlock_i::*;
use crate::implementation::lock::node_i::*;
use crate::protocol::lock::types::*;
use crate::protocol::lock::{self, node::*};

use super::host_s::EventResults;
use super::netlock_i::only_sent_marshalable_data;

verus! {
    pub struct NodeImpl {
        pub node: Node,
        pub me: EndPoint,
    }

    proof fn empty_event_results() -> (event_results: EventResults)
    ensures
        event_results.well_typed_events(),
        event_results.ios =~= event_results.event_seq(),
        event_results.ios == Seq::<NetEvent>::empty(),
    {
        EventResults{
            recvs: Seq::<NetEvent>::empty(),
            clocks: Seq::<NetEvent>::empty(),
            sends: Seq::<NetEvent>::empty(),
            ios: Seq::<NetEvent>::empty(),
        }
    }

    impl NodeImpl {
        pub open spec fn valid(self) -> bool {
            &&& self.node.valid()
            &&& self.me@ == self.node@.config[self.node@.my_index as int]
        }

        pub open spec fn view(self) -> AbstractNode {
            self.node@
        }

        pub fn init(config: ConcreteConfig, my_index: usize, me: &EndPoint) -> (rc: Self)
            requires
                valid_config(config),
                valid_config_index(config, my_index),
                me@ == abstractify_end_points(config)[my_index as int],
            ensures
                rc.valid(),
                me@ == rc.me@,
                NodeInit(rc.node@, my_index as nat, rc.node@.config),
                rc.node@.config =~= abstractify_end_points(config),
                rc.node@.my_index == my_index as nat,
        {
            let node = Node::init(my_index, config);
            assert(node.my_index == my_index);
            let node_impl = NodeImpl{
                me: node.config[my_index].clone_up_to_view(),
                node: node,
            };
            node_impl
        }

        pub fn next_grant(&mut self, netc: &mut NetClient) -> (rc: (bool, Ghost<EventResults>, Ghost<Seq<LockIo>>))
            requires
            // These lines just correspond to self.valid(), but I'm not sure how to pass the
            // mutable netc reference to the valid spec function, so the netc dependent
            // conditions are here instead of self.valid()
                old(netc).my_end_point() == old(self).me@,
                old(netc).valid(),
                old(self).valid(),
            ensures
            ({
                let (ok, Ghost(res), Ghost(ios)) = rc;
                &&& ok ==> self.valid()
                &&& ok ==> netc.valid()
                &&& ok == netc.ok()
                &&& ok ==> netc.my_end_point() == self.me@
                &&& ok ==> NodeGrant(old(self).node@, self.node@, ios)
                &&& ok ==> abstractify_raw_log_to_ios(res.ios) == ios
                &&& ok ==> res.event_seq() == res.ios
                &&& ok ==> only_sent_marshalable_data(res.ios)
                &&& (ok || res.sends.len() > 0) ==> (*netc).history() == (*old(netc)).history() + res.event_seq()
                &&& res.well_typed_events()
            })
        {
            let (transfer_packet, Ghost(ios)) = self.node.grant();
            let ghost net_event_log = Seq::<NetEvent>::empty();
            let (ok, Ghost(send_events)) = send(netc, transfer_packet, &self.me);

            if !ok {
                let ghost event_results = empty_event_results();
                return (false, Ghost(event_results), Ghost(Seq::<LockIo>::empty()));
            }

            let ghost event_results = EventResults{
                recvs: seq![],
                clocks: seq![],
                sends: send_events,
                ios: send_events,
            };

            proof {
                assert(ok ==> abstractify_raw_log_to_ios(event_results.ios) =~= ios);
            }
            (ok, Ghost(event_results), Ghost(ios))
        }

        pub fn next_accept(&mut self, netc: &mut NetClient) -> (rc: (bool, Ghost<EventResults>, Ghost<Seq<LockIo>>))
            requires
                (*old(netc)).my_end_point() == old(self).me@,
                (*old(netc)).valid(),
                (*old(self)).valid(),
                (*old(netc)).state() is Receiving
            ensures
                ({
                    let (ok, Ghost(res), Ghost(ios)) = rc;

                    &&& ok == netc.ok()
                    &&& ok ==> self.valid()
                    &&& ok ==> netc.valid()
                    &&& ok ==> netc.my_end_point() == self.me@
                    &&& ok ==> only_sent_marshalable_data(res.ios)
                    &&& (ok || res.sends.len() > 0) ==> (*netc).history() == (*old(netc)).history() + res.event_seq()
                    &&& ok ==> NodeAccept(old(self).node@, self.node@, ios)
                    &&& ok ==> abstractify_raw_log_to_ios(res.ios) == ios
                    &&& ok ==> res.event_seq() == res.ios
                    &&& res.well_typed_events()
                })
        {
            let (rr, Ghost(receive_event)) = receive(netc, &self.me);
            let ghost net_event_log = seq![receive_event];
            match rr {
                ReceiveResult::Fail => {
                    (false, Ghost(EventResults{ recvs: seq![], clocks: seq![], sends: seq![], ios: seq![]}), Ghost(Seq::<LockIo>::empty()))
                },
                ReceiveResult::Timeout => {
                    let ghost recv = LockIo::TimeoutReceive{};
                    let ghost ios = seq![recv];
                    let ghost res = EventResults{ recvs: seq![], clocks: seq![ receive_event ], sends: seq![], ios: seq![receive_event] };
                    proof {
                        assert(res.event_seq() == res.ios);
                        assert((*netc).history() == (*old(netc)).history() + res.event_seq());
                        assert(abstractify_raw_log_to_ios(res.ios) =~= ios);
                    }
                    (true, Ghost(res), Ghost(ios))
                },
                ReceiveResult::Packet { cpacket } => {
                    match cpacket.msg {
                         CMessage::CInvalid => {
                            let ghost res = EventResults{ recvs: seq![ receive_event ], clocks: seq![], sends: seq![],
                                ios: seq![ receive_event ] };
                            let ghost ios = abstractify_raw_log_to_ios(res.ios);
                            proof {
                                assert(res.event_seq() == res.ios);
                                assert(cpacket.msg is CInvalid);
                                assert((*netc).history() == (*old(netc)).history() + res.event_seq());
                                assert(abstractify_raw_log_to_ios(res.ios) =~= ios);
                            }
                             (true, Ghost(res), Ghost(ios))
                         },
                         _ => {
                            let (opt_locked_packet, Ghost(ios)) = self.node.accept(cpacket);
                            match (opt_locked_packet) {
                                Some(locked_packet) => {
                                    let (ok, Ghost(send_event_log)) = send(netc, Some(locked_packet), &self.me);
                                    assert(ok ==> netc.ok());

                                    if !ok {
                                        let ghost event_results = empty_event_results();
                                        return (false, Ghost(event_results), Ghost(Seq::<LockIo>::empty()));
                                    }

                                    let ghost event_results = EventResults{
                                        recvs: seq![receive_event],
                                        clocks: seq![],
                                        sends: send_event_log,
                                        ios: seq![receive_event] + send_event_log,
                                    };

                                    proof {
                                        assert(ok ==> abstractify_raw_log_to_ios(event_results.ios) =~= ios);
                                        assert(event_results.ios =~= event_results.event_seq());
                                        assert(!(locked_packet.msg@ is Invalid));
                                        assert(ok ==> (*netc).history() == (*old(netc)).history() + event_results.ios);
                                        assert(event_results.well_typed_events());
                                    }
                                    (ok, Ghost(event_results), Ghost(ios))
                                },
                                None => {
                                    let ghost event_results = EventResults{
                                        recvs: seq![receive_event],
                                        clocks: seq![],
                                        sends: seq![],
                                        ios: seq![receive_event],
                                    };
                                    proof {
                                        assert(abstractify_raw_log_to_ios(event_results.ios) =~= ios);
                                        assert((*netc).history() == (*old(netc)).history() + event_results.event_seq());
                                    }
                                    (true, Ghost(event_results), Ghost(ios))
                                }
                            }
                        }
                    }
                },
            }
        }

        pub fn host_next_main(&mut self, netc: &mut NetClient) -> (rc: (bool, Ghost<EventResults>, Ghost<Seq<LockIo>>))
            requires
                (*old(netc)).my_end_point() == old(self).me@,
                (*old(netc)).valid(),
                (*old(self)).valid(),
                (*old(netc)).state() is Receiving
            ensures
                ({
                    let (ok, Ghost(res), Ghost(ios)) = rc;
                    &&& ok ==> self.valid()
                    &&& ok ==> netc.valid()
                    &&& ok == netc.ok()
                    &&& ok ==> netc.my_end_point() == self.me@
                    &&& ok ==> NodeNext(old(self)@, self@, ios)
                    &&& ok ==> abstractify_raw_log_to_ios(res.ios) =~= ios
                    &&& ok ==> only_sent_marshalable_data(res.ios)
                    &&& ok ==> res.event_seq() == res.ios
                    &&& (ok || res.sends.len() > 0) ==> (*netc).history() == (*old(netc)).history() + res.event_seq()
                    &&& res.well_typed_events()
                })
        {
            if self.node.held {
                self.next_grant(netc)
            } else {
                self.next_accept(netc)
            }
        }
    }
}