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

// Copyright 2023 Protocol Labs.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

use std::task::{Context, Poll};

use futures::FutureExt;
use libp2p_core::upgrade::{DeniedUpgrade, ReadyUpgrade};
use libp2p_swarm::{
    handler::{
        ConnectionEvent, DialUpgradeError, FullyNegotiatedInbound, FullyNegotiatedOutbound,
        ListenUpgradeError,
    },
    ConnectionHandler, ConnectionHandlerEvent, StreamProtocol, SubstreamProtocol,
};
use tracing::error;
use void::Void;

use crate::Run;

#[derive(Debug)]
pub struct Event {
    pub stats: Run,
}

pub struct Handler {
    inbound: futures_bounded::FuturesSet<Result<Run, std::io::Error>>,
}

impl Handler {
    pub fn new() -> Self {
        Self {
            inbound: futures_bounded::FuturesSet::new(
                crate::RUN_TIMEOUT,
                crate::MAX_PARALLEL_RUNS_PER_CONNECTION,
            ),
        }
    }
}

impl Default for Handler {
    fn default() -> Self {
        Self::new()
    }
}

impl ConnectionHandler for Handler {
    type FromBehaviour = Void;
    type ToBehaviour = Event;
    type InboundProtocol = ReadyUpgrade<StreamProtocol>;
    type OutboundProtocol = DeniedUpgrade;
    type OutboundOpenInfo = Void;
    type InboundOpenInfo = ();

    fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
        SubstreamProtocol::new(ReadyUpgrade::new(crate::PROTOCOL_NAME), ())
    }

    fn on_behaviour_event(&mut self, v: Self::FromBehaviour) {
        void::unreachable(v)
    }

    fn on_connection_event(
        &mut self,
        event: ConnectionEvent<
            Self::InboundProtocol,
            Self::OutboundProtocol,
            Self::InboundOpenInfo,
            Self::OutboundOpenInfo,
        >,
    ) {
        match event {
            ConnectionEvent::FullyNegotiatedInbound(FullyNegotiatedInbound {
                protocol,
                info: _,
            }) => {
                if self
                    .inbound
                    .try_push(crate::protocol::receive_send(protocol).boxed())
                    .is_err()
                {
                    tracing::warn!("Dropping inbound stream because we are at capacity");
                }
            }
            ConnectionEvent::FullyNegotiatedOutbound(FullyNegotiatedOutbound { info, .. }) => {
                void::unreachable(info)
            }

            ConnectionEvent::DialUpgradeError(DialUpgradeError { info, .. }) => {
                void::unreachable(info)
            }
            ConnectionEvent::AddressChange(_)
            | ConnectionEvent::LocalProtocolsChange(_)
            | ConnectionEvent::RemoteProtocolsChange(_) => {}
            ConnectionEvent::ListenUpgradeError(ListenUpgradeError { info: (), error }) => {
                void::unreachable(error)
            }
            _ => {}
        }
    }

    #[tracing::instrument(level = "trace", name = "ConnectionHandler::poll", skip(self, cx))]
    fn poll(
        &mut self,
        cx: &mut Context<'_>,
    ) -> Poll<
        ConnectionHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::ToBehaviour>,
    > {
        loop {
            match self.inbound.poll_unpin(cx) {
                Poll::Ready(Ok(Ok(stats))) => {
                    return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Event { stats }))
                }
                Poll::Ready(Ok(Err(e))) => {
                    error!("{e:?}");
                    continue;
                }
                Poll::Ready(Err(e @ futures_bounded::Timeout { .. })) => {
                    error!("inbound perf request timed out: {e}");
                    continue;
                }
                Poll::Pending => {}
            }

            return Poll::Pending;
        }
    }
}