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

// Copyright 2021 Protocol Labs.
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// copy of this software and associated documentation files (the "Software"),
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use prometheus_client::metrics::counter::Counter;
use prometheus_client::registry::Registry;

pub(crate) struct Metrics {
    messages: Counter,
}

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

        let messages = Counter::default();
        sub_registry.register("messages", "Number of messages received", messages.clone());

        Self { messages }
    }
}

impl super::Recorder<libp2p_gossipsub::Event> for Metrics {
    fn record(&self, event: &libp2p_gossipsub::Event) {
        if let libp2p_gossipsub::Event::Message { .. } = event {
            self.messages.inc();
        }
    }
}