fuel_core_p2p/
heartbeat.rs

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
use crate::Multiaddr;
use fuel_core_types::fuel_types::BlockHeight;
pub use handler::Config;
use handler::{
    HeartbeatHandler,
    HeartbeatInEvent,
    HeartbeatOutEvent,
};
use libp2p::{
    core::Endpoint,
    swarm::{
        derive_prelude::ConnectionId,
        ConnectionDenied,
        FromSwarm,
        NetworkBehaviour,
        NotifyHandler,
        THandler,
        THandlerInEvent,
        THandlerOutEvent,
        ToSwarm,
    },
    PeerId,
};
use std::{
    collections::VecDeque,
    task::Poll,
};

mod handler;

pub const HEARTBEAT_PROTOCOL: &str = "/fuel/heartbeat/0.0.1";

#[derive(Debug, Clone)]
enum HeartbeatAction {
    HeartbeatEvent(Event),
    BlockHeightRequest {
        peer_id: PeerId,
        connection_id: ConnectionId,
        in_event: HeartbeatInEvent,
    },
}

impl HeartbeatAction {
    fn build(self) -> ToSwarm<Event, HeartbeatInEvent> {
        match self {
            Self::HeartbeatEvent(event) => ToSwarm::GenerateEvent(event),
            Self::BlockHeightRequest {
                peer_id,
                connection_id,
                in_event,
            } => ToSwarm::NotifyHandler {
                handler: NotifyHandler::One(connection_id),
                peer_id,
                event: in_event,
            },
        }
    }
}

#[derive(Debug, Clone, Copy)]
pub struct Event {
    pub peer_id: PeerId,
    pub latest_block_height: BlockHeight,
}

#[derive(Debug, Clone)]
pub struct Behaviour {
    config: Config,
    pending_events: VecDeque<HeartbeatAction>,
    current_block_height: BlockHeight,
}

impl Behaviour {
    pub fn new(config: Config, block_height: BlockHeight) -> Self {
        Self {
            config,
            pending_events: VecDeque::default(),
            current_block_height: block_height,
        }
    }

    pub fn update_block_height(&mut self, block_height: BlockHeight) {
        self.current_block_height = block_height;
    }
}

impl NetworkBehaviour for Behaviour {
    type ConnectionHandler = HeartbeatHandler;
    type ToSwarm = Event;

    fn handle_established_inbound_connection(
        &mut self,
        _connection_id: ConnectionId,
        _peer: PeerId,
        _local_addr: &Multiaddr,
        _remote_addr: &Multiaddr,
    ) -> Result<THandler<Self>, ConnectionDenied> {
        Ok(HeartbeatHandler::new(self.config.clone()))
    }

    fn handle_established_outbound_connection(
        &mut self,
        _connection_id: ConnectionId,
        _peer: PeerId,
        _addr: &Multiaddr,
        _role_override: Endpoint,
    ) -> Result<THandler<Self>, ConnectionDenied> {
        Ok(HeartbeatHandler::new(self.config.clone()))
    }

    fn on_swarm_event(&mut self, _event: FromSwarm) {}

    fn on_connection_handler_event(
        &mut self,
        peer_id: PeerId,
        connection_id: ConnectionId,
        event: THandlerOutEvent<Self>,
    ) {
        match event {
            HeartbeatOutEvent::BlockHeight(latest_block_height) => self
                .pending_events
                .push_back(HeartbeatAction::HeartbeatEvent(Event {
                    peer_id,
                    latest_block_height,
                })),
            HeartbeatOutEvent::RequestBlockHeight => {
                self.pending_events
                    .push_back(HeartbeatAction::BlockHeightRequest {
                        peer_id,
                        connection_id,
                        in_event: HeartbeatInEvent::LatestBlock(
                            self.current_block_height,
                        ),
                    })
            }
        }
    }

    fn poll(
        &mut self,
        _: &mut std::task::Context<'_>,
    ) -> Poll<ToSwarm<Self::ToSwarm, THandlerInEvent<Self>>> {
        if let Some(action) = self.pending_events.pop_front() {
            return Poll::Ready(action.build())
        }

        Poll::Pending
    }
}