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// Copyright 2021 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 prometheus_client::encoding::{EncodeLabelSet, EncodeLabelValue};
use prometheus_client::metrics::counter::Counter;
use prometheus_client::metrics::family::Family;
use prometheus_client::metrics::histogram::{exponential_buckets, Histogram};
use prometheus_client::registry::{Registry, Unit};
#[derive(Clone, Hash, PartialEq, Eq, EncodeLabelSet, Debug)]
struct FailureLabels {
reason: Failure,
}
impl From<&libp2p_ping::Failure> for FailureLabels {
fn from(failure: &libp2p_ping::Failure) -> Self {
match failure {
libp2p_ping::Failure::Timeout => FailureLabels {
reason: Failure::Timeout,
},
libp2p_ping::Failure::Unsupported => FailureLabels {
reason: Failure::Unsupported,
},
libp2p_ping::Failure::Other { .. } => FailureLabels {
reason: Failure::Other,
},
}
}
}
#[derive(Clone, Hash, PartialEq, Eq, EncodeLabelValue, Debug)]
enum Failure {
Timeout,
Unsupported,
Other,
}
pub(crate) struct Metrics {
rtt: Histogram,
failure: Family<FailureLabels, Counter>,
}
impl Metrics {
pub(crate) fn new(registry: &mut Registry) -> Self {
let sub_registry = registry.sub_registry_with_prefix("ping");
let rtt = Histogram::new(exponential_buckets(0.001, 2.0, 12));
sub_registry.register_with_unit(
"rtt",
"Round-trip time sending a 'ping' and receiving a 'pong'",
Unit::Seconds,
rtt.clone(),
);
let failure = Family::default();
sub_registry.register(
"failure",
"Failure while sending a 'ping' or receiving a 'pong'",
failure.clone(),
);
Self { rtt, failure }
}
}
impl super::Recorder<libp2p_ping::Event> for Metrics {
fn record(&self, event: &libp2p_ping::Event) {
match &event.result {
Ok(rtt) => {
self.rtt.observe(rtt.as_secs_f64());
}
Err(failure) => {
self.failure.get_or_create(&failure.into()).inc();
}
}
}
}
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