Create the exporter

main
finga 7 months ago
commit 9a7f202f85
  1. 13
      .cargo/config
  2. 1
      .gitignore
  3. 16
      .woodpecker.yml
  4. 864
      Cargo.lock
  5. 32
      Cargo.toml
  6. 51
      README.md
  7. 7
      debian/default
  8. 11
      debian/service
  9. 137
      src/main.rs

@ -0,0 +1,13 @@
[target.'cfg(feature = "cargo-clippy")']
rustflags = [
"-Dwarnings",
"-Dclippy::pedantic",
"-Dclippy::nursery",
"-Dclippy::cargo",
]
[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"
[target.aarch64-unknown-linux-gnu]
linker = "aarch64-linux-gnu-gcc"

1
.gitignore vendored

@ -0,0 +1 @@
/target

@ -0,0 +1,16 @@
pipeline:
checkmate:
group: default
image: rust_full
commands:
- cargo checkmate
build_release:
group: default
image: rust_full
commands:
- cargo build --all-features --release
build_deb:
group: default
image: rust_full
commands:
- cargo deb

864
Cargo.lock generated

@ -0,0 +1,864 @@
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@ -0,0 +1,32 @@
[package]
name = "dht11-exporter"
version = "0.1.0"
authors = ["finga <finga@onders.org>"]
edition = "2021"
description = "Prometheus exporter for the DHT11 sensor."
readme = "README.md"
license = "GPL-3.0-or-later"
repository = "https://git.onders.org/finga/dht11-exporter"
keywords = ["prometheus", "metrics"]
categories = ["api-bindings", "command-line-utilities", "visualization"]
[dependencies]
anyhow = "1.0"
log = "0.4"
env_logger = "0.9"
tokio = { version = "1.17", features = ["rt-multi-thread", "macros"] }
axum = "0.5"
clap = { version = "3.1", features = ["derive"] }
rppal = { version = "0.13", features = ["hal"] }
rppal-dht11 = "0.3"
[package.metadata.deb]
extended-description = "Prometheus exporter for the DHT11 sensor."
section = "utility"
maintainer-scripts = "debian/"
systemd-units = { enable = true }
assets = [
["target/release/dht11-exporter", "usr/bin/", "755"],
["README.md", "usr/share/doc/dht11-exporter/README", "644"],
["debian/default", "etc/default/dht11-exporter", "644"],
]

@ -0,0 +1,51 @@
# Exporter for the DHT11 sensor [![status-badge](https://ci.onders.org/api/badges/finga/dht11-exporter/status.svg)](https://ci.onders.org/finga/dht11-exporter)
A Prometheus exporter for the DHT11 sensor.
## Build
Cargo, the Rust package manager, is used to build this project.
### Same architecture as system
Compile it for the same architecture as the build system:
```sh
cargo build --release
```
### Cross-compile for amd64 (recent RaspberryPi)
Cross-compile it for the amd64 architecture:
```sh
PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu cargo build --target aarch64-unknown-linux-gnu --release
```
## Debian
To build a package for Debian, Raspbian, and so on,
[`cargo-deb`](https://crates.io/crates/cargo-deb) can be used.
The package comes with an automatically started and enabled systemd
service unit which can be configured via
`/etc/default/dht11-exporter`.
### Same architecture as system
Build a `deb` package for the same architecture as the build system:
```sh
cargo deb
```
### Cross-compile for amd64 (recent RaspberryPi)
Build a `deb` package for the amd64 architecture:
```sh
PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu cargo deb --target aarch64-unknown-linux-gnu
```
## Usage
```
USAGE:
dht11-exporter [OPTIONS]
OPTIONS:
-a, --address <ADDRESS> The IPv4 or IPv6 address where the metrics are served [default:
127.0.0.1]
-g, --gpio <GPIO> The GPIO pin of the DHT11 data line [default: 4]
-h, --help Print help information
-p, --port <PORT> The port where the metrics are served [default: 9112]
-V, --version Print version information
```

7
debian/default vendored

@ -0,0 +1,7 @@
ARGS=""
# dht11-exporter supports the following options:
# -a, --address <ADDRESS> The IPv4 or IPv6 address where the metrics are served [default:
# 127.0.0.1]
# -g, --gpio <GPIO> The GPIO pin of the DHT11 data line [default: 4]
# -p, --port <PORT> The port where the metrics are served [default: 9112]

11
debian/service vendored

@ -0,0 +1,11 @@
[Unit]
Description=DHT11 sensor exporter
[Service]
Group=gpio
Restart=always
EnvironmentFile=/etc/default/dht11-exporter
ExecStart=/usr/bin/dht11-exporter $ARGS
[Install]
WantedBy=multi-user.target

@ -0,0 +1,137 @@
use anyhow::{bail, Result};
use axum::{routing::get, Extension, Router, Server};
use clap::Parser;
use log::{debug, error, info};
use rppal::{
gpio::{Gpio, Mode},
hal::Delay,
};
use rppal_dht11::{Dht11, Measurement};
use std::{
net::{IpAddr, SocketAddr},
sync::{
atomic::{AtomicU64, Ordering},
Arc,
},
};
use tokio::{spawn, task::JoinHandle, try_join};
#[derive(Parser)]
#[clap(
about,
version,
author,
infer_subcommands(true),
propagate_version(true)
)]
struct Args {
/// The GPIO pin of the DHT11 data line
#[clap(short, long, default_value = "4")]
gpio: u8,
/// The IPv4 or IPv6 address where the metrics are served.
#[clap(short, long, default_value = "127.0.0.1")]
address: IpAddr,
/// The port where the metrics are served.
#[clap(short, long, default_value = "9112")]
port: u16,
}
#[derive(Default)]
struct AtomicF64 {
storage: AtomicU64,
}
impl AtomicF64 {
fn store(&self, value: f64, ordering: Ordering) {
let as_u64 = value.to_bits();
self.storage.store(as_u64, ordering);
}
fn load(&self, ordering: Ordering) -> f64 {
let as_u64 = self.storage.load(ordering);
f64::from_bits(as_u64)
}
}
#[derive(Default)]
struct Metrics {
temperature: AtomicF64,
humidity: AtomicF64,
}
#[allow(clippy::unused_async)]
async fn listen_dht11(pin: u8, metrics: Arc<Metrics>) -> Result<()> {
let pin = Gpio::new()?.get(pin)?.into_io(Mode::Output);
let mut dht11 = Dht11::new(pin);
let mut delay = Delay::new();
loop {
match dht11.perform_measurement_with_retries(&mut delay, 20) {
Ok(Measurement {
temperature,
humidity,
}) => {
let (temperature, humidity) =
(f64::from(temperature) / 10.0, f64::from(humidity) / 10.0);
debug!(
"Temperature: {:.1} °C Humidity: {:.1}%",
temperature, humidity
);
metrics.temperature.store(temperature, Ordering::Relaxed);
metrics.humidity.store(humidity, Ordering::Relaxed);
}
Err(e) => error!("Failed to perform measurement: {:?}", e),
}
}
}
#[allow(clippy::unused_async)]
async fn get_metrics(Extension(metrics): Extension<Arc<Metrics>>) -> String {
format!(
r"# HELP dht11 temperature in Celsius.
# TYPE dht11_temperature gauge
dht11_temperature {}
# HELP dht11 humidity in percent.
# TYPE dht11_humidity gauge
dht11_humidity {}
",
metrics.temperature.load(Ordering::Relaxed),
metrics.humidity.load(Ordering::Relaxed),
)
}
async fn listen_http(address: IpAddr, port: u16, metrics: Arc<Metrics>) -> Result<()> {
let app = Router::new()
.route("/metrics", get(get_metrics))
.layer(Extension(metrics));
let addr = SocketAddr::from((address, port));
info!("Listening on {}:{}", address, port);
Ok(Server::bind(&addr).serve(app.into_make_service()).await?)
}
async fn flatten<T>(handle: JoinHandle<Result<T>>) -> Result<T>
where
T: Send,
{
match handle.await {
Ok(Ok(result)) => Ok(result),
Ok(Err(err)) => bail!(err),
Err(err) => bail!(err),
}
}
#[tokio::main]
async fn main() -> Result<()> {
env_logger::init();
let args = Args::parse();
let metrics = Arc::new(Metrics::default());
try_join!(
flatten(spawn(listen_dht11(4, Arc::clone(&metrics)))),
flatten(spawn(listen_http(
args.address,
args.port,
Arc::clone(&metrics)
)))
)?;
Ok(())
}
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