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"prometheus", +] + +[[package]] +name = "zstd" +version = "0.11.2+zstd.1.5.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "20cc960326ece64f010d2d2107537f26dc589a6573a316bd5b1dba685fa5fde4" +dependencies = [ + "zstd-safe", +] + +[[package]] +name = "zstd-safe" +version = "5.0.2+zstd.1.5.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db" +dependencies = [ + "libc", + "zstd-sys", +] + +[[package]] +name = "zstd-sys" +version = "2.0.5+zstd.1.5.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "edc50ffce891ad571e9f9afe5039c4837bede781ac4bb13052ed7ae695518596" +dependencies = [ + "cc", + "libc", + "pkg-config", +] diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..c9fb2cb --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,15 @@ +[package] +name = "zfs_promexporter" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +actix-web = "4" +prometheus = "0.13.3" +libzetta = "0.3.1" +log = "0.4" +fern = "0.6.1" +chrono = "0.4.23" +clap = { version = "4.0.23", features = [ "derive" ] } diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..c8bbede --- /dev/null +++ b/Dockerfile @@ -0,0 +1,42 @@ +FROM rust:alpine3.14 as builder + +# update packages +RUN apk update +RUN apk add zfs-dev build-base pkgconfig + +# Install rust toolchains +RUN rustup toolchain install stable +RUN rustup default stable + +# Build dependencies only. Separate these for caches +RUN cargo install cargo-build-deps + +# Copy application now +WORKDIR /app +COPY ./ /app + +RUN cargo build-deps --release + +# Build the release executable. +RUN cargo build --release + +# Runner stage. +FROM alpine + +# update packages +RUN apk update +RUN apk add zfs + +ARG UNAME=zfs_promexporter +ARG UID=1000 +ARG GID=1000 + +# Add user and copy the executable from the build stage. +RUN adduser --disabled-password --gecos "" $UNAME -s -G $GID -u $UID +COPY --from=builder --chown=$UID:$GID /app/target/release/zfs_promexporter /app/zfs_promexporter + +USER $UNAME + +WORKDIR /app + +ENTRYPOINT [ "/app/zfs_promexporter" ] \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..3308230 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2022 SeanOMik + +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. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..8fb3b3a --- /dev/null +++ b/README.md @@ -0,0 +1,16 @@ +# ZFS Prometheus Metrics Exporter +ZFS metrics exporter for Prometheus! + +## Usage +``` +ZFS metrics exporter for Prometheus! + +Usage: zfs_promexporter [OPTIONS] + +Options: + -b, --bind-address The address to bind and listen from [default: 0.0.0.0] + -p, --port The port to listen on [default: 8080] + --log-level The lowest log level (off, error, warn, info, debug, or trace) [default: info] + -h, --help Print help + -V, --version Print version +``` \ No newline at end of file diff --git a/shell.nix b/shell.nix new file mode 100644 index 0000000..fe0368d --- /dev/null +++ b/shell.nix @@ -0,0 +1,13 @@ +{ pkgs ? import {} }: + +pkgs.mkShell { + # nativeBuildInputs is usually what you want -- tools you need to run + nativeBuildInputs = with pkgs; [ + gdb + lldb + pkg-config + zfs + git + rustup + ]; +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..12725e3 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,429 @@ +use actix_web::{get, App, HttpServer, Responder}; +use actix_web::middleware::Logger; + +use libzetta::zpool::{ZpoolOpen3, ZpoolEngine, Vdev, Health, vdev::ErrorStatistics, Reason}; + +use prometheus::{Encoder, IntCounter, Registry}; + +use clap::Parser; + +use std::{collections::HashMap, string::FromUtf8Error, process::Command}; + +use log::{error, debug}; + +fn encode_metrics(reg: &Registry) -> Result { + let mut buffer: Vec = Vec::new(); + let encoder = prometheus::TextEncoder::new(); + encoder.encode(®.gather(), &mut buffer) + .unwrap(); // TODO + + String::from_utf8(buffer.clone()) +} + +fn register_intcounter(reg: &Registry, name: &str, help: &str, val: u64) -> prometheus::Result<()> { + let counter = IntCounter::new(name, help)?; + counter.inc_by(val); + reg.register(Box::new(counter))?; + + Ok(()) +} + +fn register_health(labels: HashMap, health: Health) -> prometheus::Result> { + let mut labels = labels; + labels.insert(String::from("field_type"), String::from("enum")); + + labels.insert(String::from("state"), String::from("online")); + let online_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let online_val = match health { + Health::Online => 1, + _ => 0, + }; + register_intcounter(&online_reg, "health", "The health of the device. This is an enum.", online_val)?; + + labels.insert(String::from("state"), String::from("degraded")); + let degraded_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let degraded_val = match health { + Health::Degraded => 1, + _ => 0, + }; + register_intcounter(°raded_reg, "health", "The health of the device. This is an enum.", degraded_val)?; + + labels.insert(String::from("state"), String::from("faulted")); + let faulted_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let faulted_val = match health { + Health::Faulted => 1, + _ => 0, + }; + register_intcounter(&faulted_reg, "health", "The health of the device. This is an enum.", faulted_val)?; + + labels.insert(String::from("state"), String::from("offline")); + let offline_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let offline_val = match health { + Health::Offline => 1, + _ => 0, + }; + register_intcounter(&offline_reg, "health", "The health of the device. This is an enum.", offline_val)?; + + labels.insert(String::from("state"), String::from("available")); + let available_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let available_val = match health { + Health::Available => 1, + _ => 0, + }; + register_intcounter(&available_reg, "health", "The health of the device. This is an enum.", available_val)?; + + labels.insert(String::from("state"), String::from("unavailable")); + let unavailable_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let unavailable_val = match health { + Health::Unavailable => 1, + _ => 0, + }; + register_intcounter(&unavailable_reg, "health", "The health of the device. This is an enum.", unavailable_val)?; + + labels.insert(String::from("state"), String::from("removed")); + let removed_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone()))?; + let removed_val = match health { + Health::Removed => 1, + _ => 0, + }; + register_intcounter(&removed_reg, "health", "The health of the device. This is an enum.", removed_val)?; + + Ok(vec![online_reg, degraded_reg, faulted_reg, offline_reg, available_reg, unavailable_reg, removed_reg]) +} + +fn register_error_stats(reg: &Registry, error_stats: ErrorStatistics) -> prometheus::Result<()> { + register_intcounter(reg, "read_errors", "The amount of I/O errors that occurred during reading", error_stats.read)?; + register_intcounter(reg, "write_errors", "The amount of I/O errors that occurred during writing", error_stats.write)?; + register_intcounter(reg, "checksum_errors", "The amount of checksum errors, meaning the device returned corrupted data from a read request", error_stats.checksum)?; + + Ok(()) +} + +fn register_vdev_stats(vdev: &Vdev, vdev_device: &Device, vdev_name: String, start_labels: HashMap) -> prometheus::Result { + let mut labels = start_labels.clone(); + labels.insert(String::from("device_type"), String::from("vdev")); + labels.remove("vdev"); // Remove vdev since its not needed because of "source_name" + labels.insert(String::from("device_name"), vdev_name.clone()); + + let vdev_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels))?; + vdev_device.io_stats.collect_metrics(&vdev_reg)?; + register_error_stats(&vdev_reg, vdev.error_statistics().clone())?; + + register_intcounter(&vdev_reg, "drive_count", "Total count of drives in this pool or vdev", vdev.disks().len() as u64)?; + + Ok(vdev_reg) +} + +#[get("/metrics")] +async fn metrics_endpoint() -> impl Responder { + let zpool = ZpoolOpen3::default(); + let all_pools = zpool.all().unwrap(); // TODO: Dont unwrap + + let mut registries = Vec::new(); + + for pool in all_pools.iter() { + // Print some stuff that can be used for later features. + // My pool is in a healthy state currently, so I can't actually work on these + // to see what they output. + { + let logs = pool.logs(); + if logs.len() != 0 { + debug!("Found pool logs!: {:?}", logs); + } + + if let Some(errors) = pool.errors() { + debug!("Found pool errors!: {}", errors); + } + + // Currently reason is only a wrapper around String. + if let Some(Reason::Other(reason)) = pool.reason() { + debug!("Found pool 'reason': {}", reason); + } + } + + let mut labels = HashMap::new(); + labels.insert(String::from("device_type"), String::from("pool")); + labels.insert(String::from("pool"), pool.name().clone()); + labels.insert(String::from("device_name"), pool.name().clone()); + + // Create a registry for general pool metrics + let pool_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone())).unwrap(); + + register_intcounter(&pool_reg, "vdev_count", "Count of vdevs in this pool", pool.vdevs().len() as u64).unwrap(); + register_intcounter(&pool_reg, "spare_count", "The amount of spare drives", pool.spares().len() as u64).unwrap(); + + // Calculate the total drive count and register it as a metric. + let total_drive_count = IntCounter::new("drive_count", "Total count of drives in this pool or vdev").unwrap(); + for vdev in pool.vdevs().iter() { + total_drive_count.inc_by(vdev.disks().len() as u64); + } + pool_reg.register(Box::new(total_drive_count)).unwrap(); + + // Register pool health + registries.extend(register_health(labels.clone(), pool.health().clone()).unwrap()); + register_error_stats(&pool_reg, pool.error_statistics().clone()).unwrap(); + + // Run the zpool iostat command to get io stat information of all the pool, its vdevs and disks. + let mut cmd = Command::new("zpool"); + cmd.args(["iostat", "-Hpvy", pool.name().as_str(), "1", "1"]); + let output = cmd.output(); + let output = output.expect(&format!("Failure to execute `zpool iostat`")); + + // Check if the `zpool iostat` command executed successfully. + if !output.status.success() { + error!("Failed to execute `zpool iostat`!"); + error!("Full command: `{:?} {}`", cmd.get_program(), cmd.get_args() + .into_iter() + .map(|arg| arg.to_str().unwrap().to_string()) + .collect::>() + .join(" ")); + + error!("stdout:\n{:?}", output.stdout); + error!("stderr:\n{:?}", output.stderr); + error!("exit code: {}", output.status); + panic!("Failure to execute zpool iostat!"); + } + let output = String::from_utf8(output.stdout) + .expect(&format!("Failure to convert output of `zpool iostat` to utf8.")); + + let devices = Device::parse_from_stdout(output); + + // Get the pool from the devices and collect the io stats + if let Some(pool_dev) = devices.iter().find(|dev| dev.name == pool.name().clone()) { + pool_dev.io_stats.collect_metrics(&pool_reg).unwrap(); + + // Get the raw size of the pool. + let output = String::from_utf8( + Command::new("zpool") + .args(["list", pool.name().as_str(), "-Hp"]) + .output() + .expect(&format!("Failure to execute `zpool iostat {} -v 1 2`", pool.name())) + .stdout).expect(&format!("Failure to convert output of `zpool iostat {} -v 1 2` to utf8.", pool.name())); + + // Extract the size from the output + let cols: Vec<&str> = output.split("\t").collect(); + if cols.len() == 11 { + let size: u64 = cols[1].parse().unwrap(); + register_intcounter(&pool_reg, "raw_size", "The raw size of this device (this is not the usable space)", size).unwrap(); + } + } + + // Push pool metrics + registries.push(pool_reg); + + // The output of the zpool commands has vdevs listed before the disks in the vdev. + let mut last_vdev: Option<&Device> = None; + let mut last_vdev_data: Option<&Vdev> = None; + for device in devices.iter() { + // Skip any pools or vdevs + if device.name == pool.name().clone() { + // Skip pool + } else if device.is_pool_or_vdev() { + // Register the metrics of the last vdev before overwriting it. + if let Some(vdev) = last_vdev_data { + let reg = register_vdev_stats(vdev, device, device.name.clone(), labels.clone()).unwrap(); + + registries.push(reg); + } + + last_vdev = Some(device); // Store this device as the last vdev + last_vdev_data = None; + } else { // Register metrics for this disk + let mut labels = labels.clone(); + labels.insert(String::from("device_name"), device.name.clone()); + labels.insert(String::from("device_type"), String::from("disk")); + + // If vdev is set, add the vdev label for this disk. + if let Some(vdev) = last_vdev { + labels.insert(String::from("vdev"), vdev.name.clone()); + } + + // Create the device metric registry and collect io stats metrics + let device_reg = Registry::new_custom(Some("zfs".to_string()), Some(labels.clone())).unwrap(); + device.io_stats.collect_metrics(&device_reg).unwrap(); + + // Find the disk, and its vdev in the pool. After its found, register the disk's health and error stats. + for pool_vdev in pool.vdevs().iter() { + if let Some(pool_disk) = pool_vdev.disks().iter().find(|disk| String::from(disk.path().as_os_str().to_str().unwrap_or("")).contains(&device.name)) { + registries.extend(register_health(labels, pool_disk.health().clone()).unwrap()); + register_error_stats(&device_reg, pool_disk.error_statistics().clone()).unwrap(); + + last_vdev_data = Some(pool_vdev); + break; + } + } + + registries.push(device_reg); + } + } + + // Push the last vdev to the registry list + if let (Some(device), Some(vdev)) = (last_vdev, last_vdev_data) { + registries.push(register_vdev_stats(vdev, device, device.name.clone(), labels.clone()).unwrap()); + } + } + + // Construct the response string from all registeries. + let mut resp = String::new(); + for reg in registries.iter() { + resp.push_str(&encode_metrics(®).unwrap()); + resp.push_str("\n"); + } + + return resp; +} + +#[derive(Debug, PartialEq, Eq)] +struct IoStats { + capacity: Option, + available: Option, + + read_op: u64, + write_op: u64, + + read_band: u64, + write_band: u64, +} + +impl IoStats { + fn new(capacity: Option, available: Option, read_op: u64, write_op: u64, read_band: u64, write_band: u64) -> Self { + Self { + capacity, + available, + read_op, + write_op, + read_band, + write_band, + } + } + + fn collect_metrics(&self, reg: &Registry) -> prometheus::Result<()> { + if let (Some(capacity), Some(available)) = (self.capacity, self.available) { + register_intcounter(®, "capacity", "The capacity of the device in bytes", capacity)?; + register_intcounter(®, "available", "The available bytes in the device", available)?; + } + + register_intcounter(®, "read_operations", "The read operations for this device per second", self.read_op)?; + register_intcounter(®, "write_operations", "The write operations for this device per second", self.write_op)?; + register_intcounter(®, "read_bandwidth", "The read bandwidth for this device in bytes per second", self.read_band)?; + register_intcounter(®, "write_bandwidth", "The write bandwidth for this device in bytes per second", self.write_band)?; + + Ok(()) + } +} + +#[derive(Debug, PartialEq, Eq)] +struct Device { + name: String, + io_stats: IoStats, +} + +impl Device { + fn new(name: String, io_stats: IoStats) -> Self { + Self { + name, + io_stats + } + } + + fn is_pool_or_vdev(&self) -> bool { + self.io_stats.available.is_some() && self.io_stats.capacity.is_some() + } + + fn parse_from_stdout(stdout: String) -> Vec { + let mut input = stdout.as_str(); + + // Remove tailing \n + if input.ends_with("\n") { + input = &input[..input.len()]; + } + + let mut stats: Vec> = input.split("\n").collect::>().iter().map(|s| s.split("\t").collect::>()).collect(); + + // remove all rows that are not of length 7 or have empty columns. + stats.retain(|l| l.len() == 7 && l.iter().all(|&s| !s.is_empty())); + + let mut parsed = Vec::new(); + for row in stats.iter() { + let name = row[0]; + let alloc = row[1].parse().unwrap(); + let free = row[2].parse().unwrap(); + let read_op = row[3].parse().unwrap(); + let write_op = row[4].parse().unwrap(); + let read_band = row[5].parse().unwrap(); + let write_band = row[6].parse().unwrap(); + + // This is done since these fields can be Some(0), but alloc would never be unless + // its the device. free can be 0 if the pool is filled. + let (alloc, free) = if alloc == 0 { + (None, None) + } else { + (Some(alloc), Some(free)) + }; + + parsed.push(Device::new(String::from(name), + IoStats::new(alloc, free, read_op, write_op, read_band, write_band))); + } + + return parsed; + } +} + +/// ZFS metrics exporter for Prometheus! +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +struct Args { + /// The address to bind and listen from. + #[arg(short, long, default_value_t = String::from("0.0.0.0"))] + bind_address: String, + + /// The port to listen on. + #[arg(short, long, default_value_t = 8080)] + port: u16, + + /// The lowest log level (off, error, warn, info, debug, or trace). + #[arg(long, default_value_t = String::from("info"))] + log_level: String, +} + +#[actix_web::main] +async fn main() -> std::io::Result<()> { + let args = Args::parse(); + + // Convert log level string to an enum + let log_level = args.log_level.to_lowercase(); + let log_level = match log_level.as_str() { + "off" => log::LevelFilter::Off, + "error" => log::LevelFilter::Error, + "warn" => log::LevelFilter::Warn, + "info" => log::LevelFilter::Info, + "debug" => log::LevelFilter::Debug, + "trace" => log::LevelFilter::Trace, + _ => panic!("Unknown log level! {}, expected off, error, warn, info, debug, or trace!", log_level), + }; + + // Create logger + fern::Dispatch::new() + .format(|out, message, record| { + out.finish(format_args!( + "{}[{}][{}] {}", + chrono::Local::now().format("[%Y-%m-%d][%H:%M:%S]"), + record.target(), + record.level(), + message + )) + }) + .level(log_level) + .chain(std::io::stdout()) + //.chain(fern::log_file("output.log")?) + .apply().expect("Failure to initialize fern logger!"); + + HttpServer::new(|| { + App::new() + .wrap(Logger::default()) + .service(metrics_endpoint) + }) + .bind((args.bind_address, args.port))? + .run() + .await +} \ No newline at end of file