// 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::metrics::counter::Counter;
use prometheus_client::registry::Registry;

pub struct Metrics {
    messages: Counter,
}

impl Metrics {
    pub 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",
            Box::new(messages.clone()),
        );

        Self { messages }
    }
}

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