mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-30 13:07:23 +00:00
Bastian Köcher
e3e651f72c
* Happy new year Updates the copyright years and fixes wrong license headers. * Fix the template * Split HEADER into HEADER-APACHE & HEADER-GPL
75 lines
2.1 KiB
Rust
75 lines
2.1 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//! Wrapper around a `Future` that reports statistics about when the `Future` is polled.
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use futures::prelude::*;
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use prometheus_endpoint::{Counter, Histogram, U64};
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use std::{fmt, pin::Pin, task::{Context, Poll}};
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/// Wraps around a `Future`. Report the polling duration to the `Histogram` and when the polling
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/// starts to the `Counter`.
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pub fn with_poll_durations<T>(
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poll_duration: Histogram,
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poll_start: Counter<U64>,
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inner: T
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) -> PrometheusFuture<T> {
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PrometheusFuture {
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inner,
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poll_duration,
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poll_start,
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}
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}
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/// Wraps around `Future` and adds diagnostics to it.
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#[pin_project::pin_project]
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#[derive(Clone)]
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pub struct PrometheusFuture<T> {
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/// The inner future doing the actual work.
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#[pin]
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inner: T,
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poll_duration: Histogram,
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poll_start: Counter<U64>,
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}
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impl<T> Future for PrometheusFuture<T>
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where
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T: Future,
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{
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type Output = T::Output;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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let this = self.project();
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this.poll_start.inc();
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let _timer = this.poll_duration.start_timer();
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Future::poll(this.inner, cx)
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// `_timer` is dropped here and will observe the duration
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}
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}
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impl<T> fmt::Debug for PrometheusFuture<T>
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where
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T: fmt::Debug,
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{
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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fmt::Debug::fmt(&self.inner, f)
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}
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}
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