From 9a7f202f85438e1fe364c712e3aebf7179465b48 Mon Sep 17 00:00:00 2001 From: finga Date: Sat, 7 May 2022 21:59:31 +0200 Subject: [PATCH] Create the exporter --- .cargo/config | 13 + .gitignore | 1 + .woodpecker.yml | 16 + Cargo.lock | 864 ++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 32 ++ README.md | 51 +++ debian/default | 7 + debian/service | 11 + src/main.rs | 137 ++++++++ 9 files changed, 1132 insertions(+) create mode 100644 .cargo/config create mode 100644 .gitignore create mode 100644 .woodpecker.yml create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 README.md create mode 100644 debian/default create mode 100644 debian/service create mode 100644 src/main.rs diff --git a/.cargo/config b/.cargo/config new file mode 100644 index 0000000..199c867 --- /dev/null +++ b/.cargo/config @@ -0,0 +1,13 @@ +[target.'cfg(feature = "cargo-clippy")'] +rustflags = [ + "-Dwarnings", + "-Dclippy::pedantic", + "-Dclippy::nursery", + "-Dclippy::cargo", +] 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b/Cargo.toml @@ -0,0 +1,32 @@ +[package] +name = "dht11-exporter" +version = "0.1.0" +authors = ["finga "] +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"], +] diff --git a/README.md b/README.md new file mode 100644 index 0000000..6ed02b6 --- /dev/null +++ b/README.md @@ -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
The IPv4 or IPv6 address where the metrics are served [default: + 127.0.0.1] + -g, --gpio The GPIO pin of the DHT11 data line [default: 4] + -h, --help Print help information + -p, --port The port where the metrics are served [default: 9112] + -V, --version Print version information +``` diff --git a/debian/default b/debian/default new file mode 100644 index 0000000..e1e87a4 --- /dev/null +++ b/debian/default @@ -0,0 +1,7 @@ +ARGS="" + +# dht11-exporter supports the following options: +# -a, --address
The IPv4 or IPv6 address where the metrics are served [default: +# 127.0.0.1] +# -g, --gpio The GPIO pin of the DHT11 data line [default: 4] +# -p, --port The port where the metrics are served [default: 9112] diff --git a/debian/service b/debian/service new file mode 100644 index 0000000..28eb7ba --- /dev/null +++ b/debian/service @@ -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 diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..8728d72 --- /dev/null +++ b/src/main.rs @@ -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) -> 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>) -> 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) -> 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(handle: JoinHandle>) -> Result +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(()) +}