rust-libp2p/misc/metrics/src/dcutr.rs

// Copyright 2021 Protocol Labs.
//
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// copy of this software and associated documentation files (the "Software"),
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// Software is furnished to do so, subject to the following conditions:
//
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use prometheus_client::encoding::text::Encode;
use prometheus_client::metrics::counter::Counter;
use prometheus_client::metrics::family::Family;
use prometheus_client::registry::Registry;

pub struct Metrics {
    events: Family<EventLabels, Counter>,
}

impl Metrics {
    pub fn new(registry: &mut Registry) -> Self {
        let sub_registry = registry.sub_registry_with_prefix("relay");

        let events = Family::default();
        sub_registry.register(
            "events",
            "Events emitted by the relay NetworkBehaviour",
            Box::new(events.clone()),
        );

        Self { events }
    }
}

#[derive(Debug, Clone, Hash, PartialEq, Eq, Encode)]
struct EventLabels {
    event: EventType,
}

#[derive(Debug, Clone, Hash, PartialEq, Eq, Encode)]
enum EventType {
    InitiateDirectConnectionUpgrade,
    RemoteInitiatedDirectConnectionUpgrade,
    DirectConnectionUpgradeSucceeded,
    DirectConnectionUpgradeFailed,
}

impl From<&libp2p_dcutr::behaviour::Event> for EventType {
    fn from(event: &libp2p_dcutr::behaviour::Event) -> Self {
        match event {
            libp2p_dcutr::behaviour::Event::InitiatedDirectConnectionUpgrade {
                remote_peer_id: _,
                local_relayed_addr: _,
            } => EventType::InitiateDirectConnectionUpgrade,
            libp2p_dcutr::behaviour::Event::RemoteInitiatedDirectConnectionUpgrade {
                remote_peer_id: _,
                remote_relayed_addr: _,
            } => EventType::RemoteInitiatedDirectConnectionUpgrade,
            libp2p_dcutr::behaviour::Event::DirectConnectionUpgradeSucceeded {
                remote_peer_id: _,
            } => EventType::DirectConnectionUpgradeSucceeded,
            libp2p_dcutr::behaviour::Event::DirectConnectionUpgradeFailed {
                remote_peer_id: _,
                error: _,
            } => EventType::DirectConnectionUpgradeFailed,
        }
    }
}

impl super::Recorder<libp2p_dcutr::behaviour::Event> for super::Metrics {
    fn record(&self, event: &libp2p_dcutr::behaviour::Event) {
        self.dcutr
            .events
            .get_or_create(&EventLabels {
                event: event.into(),
            })
            .inc();
    }
}