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use futures_util::{FutureExt, future::Future};
pub use prometheus::{
self,
Registry, Error as PrometheusError, Opts,
Histogram, HistogramOpts, HistogramVec,
exponential_buckets,
core::{
GenericGauge as Gauge, GenericCounter as Counter,
GenericGaugeVec as GaugeVec, GenericCounterVec as CounterVec,
AtomicF64 as F64, AtomicI64 as I64, AtomicU64 as U64,
}
};
use prometheus::{Encoder, TextEncoder, core::Collector};
use std::net::SocketAddr;
#[cfg(not(target_os = "unknown"))]
mod networking;
mod sourced;
pub use sourced::{SourcedCounter, SourcedGauge, MetricSource, SourcedMetric};
#[cfg(target_os = "unknown")]
pub use unknown_os::init_prometheus;
#[cfg(not(target_os = "unknown"))]
pub use known_os::init_prometheus;
pub fn register<T: Clone + Collector + 'static>(metric: T, registry: &Registry) -> Result<T, PrometheusError> {
registry.register(Box::new(metric.clone()))?;
Ok(metric)
}
#[cfg(target_os = "unknown")]
mod unknown_os {
use super::*;
pub enum Error {}
pub async fn init_prometheus(_: SocketAddr, _registry: Registry) -> Result<(), Error> {
Ok(())
}
}
#[cfg(not(target_os = "unknown"))]
mod known_os {
use super::*;
use hyper::http::StatusCode;
use hyper::{Server, Body, Request, Response, service::{service_fn, make_service_fn}};
#[derive(Debug, derive_more::Display, derive_more::From)]
pub enum Error {
Hyper(hyper::Error),
Http(hyper::http::Error),
Io(std::io::Error),
#[display(fmt = "Prometheus port {} already in use.", _0)]
PortInUse(SocketAddr)
}
impl std::error::Error for Error {
fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
match self {
Error::Hyper(error) => Some(error),
Error::Http(error) => Some(error),
Error::Io(error) => Some(error),
Error::PortInUse(_) => None
}
}
}
async fn request_metrics(req: Request<Body>, registry: Registry) -> Result<Response<Body>, Error> {
if req.uri().path() == "/metrics" {
let metric_families = registry.gather();
let mut buffer = vec![];
let encoder = TextEncoder::new();
encoder.encode(&metric_families, &mut buffer).unwrap();
Response::builder().status(StatusCode::OK)
.header("Content-Type", encoder.format_type())
.body(Body::from(buffer))
.map_err(Error::Http)
} else {
Response::builder().status(StatusCode::NOT_FOUND)
.body(Body::from("Not found."))
.map_err(Error::Http)
}
}
#[derive(Clone)]
pub struct Executor;
impl<T> hyper::rt::Executor<T> for Executor
where
T: Future + Send + 'static,
T::Output: Send + 'static,
{
fn execute(&self, future: T) {
async_std::task::spawn(future);
}
}
pub async fn init_prometheus(prometheus_addr: SocketAddr, registry: Registry) -> Result<(), Error>{
use networking::Incoming;
let listener = async_std::net::TcpListener::bind(&prometheus_addr)
.await
.map_err(|_| Error::PortInUse(prometheus_addr))?;
log::info!("〽️ Prometheus server started at {}", prometheus_addr);
let service = make_service_fn(move |_| {
let registry = registry.clone();
async move {
Ok::<_, hyper::Error>(service_fn(move |req: Request<Body>| {
request_metrics(req, registry.clone())
}))
}
});
let server = Server::builder(Incoming(listener.incoming()))
.executor(Executor)
.serve(service)
.boxed();
let result = server.await.map_err(Into::into);
result
}
}