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diff --git a/src/docker/collector.rs b/src/docker/collector.rs new file mode 100644 index 0000000..d9c9ed8 --- /dev/null +++ b/src/docker/collector.rs @@ -0,0 +1,42 @@ +use std::sync::Arc; + +use crate::{docker::DockerStats, error::SystemExporterResult, metrics::Metrics}; + +pub struct DockerCollector { + metrics: Arc, +} + +impl DockerCollector { + pub fn new(metrics: Arc) -> Self { + Self { metrics } + } + + pub fn poll(&self) -> SystemExporterResult> { + let output = std::process::Command::new("sh") + .arg("-c") + .arg( + r#"docker stats --format='{ + "BlockIO": "{{.BlockIO}}", + "CPUPerc": "{{.CPUPerc}}", + "Container": "{{.Container}}", + "ID": "{{.ID}}", + "MemPerc": "{{.MemPerc}}", + "MemUsage": "{{.MemUsage}}", + "Name": "{{.Name}}", + "NetIO": "{{.NetIO}}", + "PIDs": "{{.PIDs}}" + }' --no-stream | jq -s '.'"#, + ) + .output() + .expect("Failed to execute command"); + + let output_str = String::from_utf8(output.stdout).expect("Not UTF-8"); + + let res = serde_json::from_str::>(&output_str)?; + + res.iter() + .for_each(|e| e.post_metrics(&self.metrics.docker)); + + Ok(res) + } +} diff --git a/src/docker/metrics.rs b/src/docker/metrics.rs new file mode 100644 index 0000000..0d40960 --- /dev/null +++ b/src/docker/metrics.rs @@ -0,0 +1,76 @@ +use crate::error::SystemExporterResult; +use prometheus::{opts, GaugeVec, Registry}; + +pub struct DockerMetrics { + pub container_cpu_perc: GaugeVec, + pub container_mem_percentage: GaugeVec, + pub container_mem_used: GaugeVec, + pub container_mem_available: GaugeVec, + pub container_block_io_read: GaugeVec, + pub container_block_io_write: GaugeVec, + pub container_net_io_received: GaugeVec, + pub container_net_io_transmitted: GaugeVec, +} + +impl DockerMetrics { + pub(crate) fn new(registry: Registry) -> SystemExporterResult { + let container_block_io_read = GaugeVec::new( + opts!("container_block_io_read", "Container Block I/O Read"), + &["container"], + )?; + let container_block_io_write = GaugeVec::new( + opts!("container_block_io_write", "Container Block I/O Write"), + &["container"], + )?; + let container_mem_used = GaugeVec::new( + opts!("container_mem_used", "Container Memory Used"), + &["container"], + )?; + let container_mem_available = GaugeVec::new( + opts!("container_mem_available", "Container Memory Available"), + &["container"], + )?; + let container_mem_percentage = GaugeVec::new( + opts!("container_mem_percentage", "Container Memory Percentage"), + &["container"], + )?; + let container_net_io_received = GaugeVec::new( + opts!( + "container_net_io_received", + "Container Network I/O Received" + ), + &["container"], + )?; + let container_net_io_transmitted = GaugeVec::new( + opts!( + "container_net_io_transmitted", + "Container Network I/O Transmitted" + ), + &["container"], + )?; + let container_cpu_perc = GaugeVec::new( + opts!("container_cpu_perc", "Container CPU Percentage"), + &["container"], + )?; + + registry.register(Box::new(container_block_io_read.clone()))?; + registry.register(Box::new(container_block_io_write.clone()))?; + registry.register(Box::new(container_mem_used.clone()))?; + registry.register(Box::new(container_mem_available.clone()))?; + registry.register(Box::new(container_mem_percentage.clone()))?; + registry.register(Box::new(container_net_io_received.clone()))?; + registry.register(Box::new(container_net_io_transmitted.clone()))?; + registry.register(Box::new(container_cpu_perc.clone()))?; + + Ok(Self { + container_block_io_read, + container_block_io_write, + container_mem_used, + container_mem_available, + container_mem_percentage, + container_net_io_received, + container_net_io_transmitted, + container_cpu_perc, + }) + } +} diff --git a/src/docker/mod.rs b/src/docker/mod.rs new file mode 100644 index 0000000..f2cb2a2 --- /dev/null +++ b/src/docker/mod.rs @@ -0,0 +1,46 @@ +use rust_decimal::Decimal; +use serde::Deserialize; + +pub mod collector; +pub mod metrics; +mod util; + +#[derive(Debug, Deserialize)] +pub struct DockerStats { + #[serde(rename = "BlockIO", with = "util::block_io_format")] + pub block_io: BlockIo, + #[serde(rename = "CPUPerc", with = "util::perc_format")] + pub cpu_perc: Decimal, + #[serde(rename = "Container")] + pub container: String, + #[serde(rename = "ID")] + pub id: String, + #[serde(rename = "MemPerc", with = "util::perc_format")] + pub mem_perc: Decimal, + #[serde(rename = "MemUsage", with = "util::mem_usage_format")] + pub mem_usage: MemUsage, + #[serde(rename = "Name")] + pub name: String, + #[serde(rename = "NetIO", with = "util::net_io_format")] + pub net_io: NetIo, + // #[serde(rename = "PIDs")] + // pub pids: String, +} + +#[derive(Debug, Deserialize)] +pub struct BlockIo { + pub read: Decimal, + pub write: Decimal, +} + +#[derive(Debug, Deserialize)] +pub struct MemUsage { + pub used: Decimal, + pub total: Decimal, +} + +#[derive(Debug, Deserialize)] +pub struct NetIo { + pub received: Decimal, + pub transmitted: Decimal, +} diff --git a/src/docker/util.rs b/src/docker/util.rs new file mode 100644 index 0000000..b0cf452 --- /dev/null +++ b/src/docker/util.rs @@ -0,0 +1,193 @@ +use crate::docker::{metrics::DockerMetrics, DockerStats}; +use rust_decimal::Decimal; +use std::str::FromStr; + +pub(crate) mod block_io_format { + use crate::docker::{util::parse_to_decimal, BlockIo}; + use serde::{self, Deserialize, Deserializer}; + + pub fn deserialize<'de, D>(deserializer: D) -> Result + where + D: Deserializer<'de>, + { + let s = String::deserialize(deserializer)?; + let parts: Vec<&str> = s.split(" / ").collect(); + if parts.len() == 2 { + match (parse_to_decimal(parts[0]), parse_to_decimal(parts[1])) { + (Ok(read), Ok(write)) => Ok(BlockIo { read, write }), + _ => Err(serde::de::Error::custom("Invalid decimal format")), + } + } else { + Err(serde::de::Error::custom("Invalid format")) + } + } +} + +pub(crate) mod mem_usage_format { + use crate::docker::{util::parse_to_decimal, MemUsage}; + use serde::{self, Deserialize, Deserializer}; + + pub fn deserialize<'de, D>(deserializer: D) -> Result + where + D: Deserializer<'de>, + { + let s = String::deserialize(deserializer)?; + let parts: Vec<&str> = s.split(" / ").collect(); + if parts.len() == 2 { + match (parse_to_decimal(parts[0]), parse_to_decimal(parts[1])) { + (Ok(used), Ok(total)) => Ok(MemUsage { used, total }), + _ => Err(serde::de::Error::custom("Invalid decimal format")), + } + } else { + Err(serde::de::Error::custom("Invalid format")) + } + } +} + +pub(crate) mod net_io_format { + use crate::docker::{util::parse_to_decimal, NetIo}; + use serde::{self, Deserialize, Deserializer}; + + pub fn deserialize<'de, D>(deserializer: D) -> Result + where + D: Deserializer<'de>, + { + let s = String::deserialize(deserializer)?; + let parts: Vec<&str> = s.split(" / ").collect(); + if parts.len() == 2 { + match (parse_to_decimal(parts[0]), parse_to_decimal(parts[1])) { + (Ok(received), Ok(transmitted)) => Ok(NetIo { + received, + transmitted, + }), + _ => Err(serde::de::Error::custom("Invalid decimal format")), + } + } else { + Err(serde::de::Error::custom("Invalid format")) + } + } +} + +pub(crate) mod perc_format { + use rust_decimal::Decimal; + use serde::{self, Deserialize, Deserializer}; + use std::str::FromStr; + + pub fn deserialize<'de, D>(deserializer: D) -> Result + where + D: Deserializer<'de>, + { + let s = String::deserialize(deserializer)?; + let number_part: &str = s.trim_end_matches('%'); + match Decimal::from_str(number_part) { + Ok(value) => Ok(value), + Err(_) => Err(serde::de::Error::custom("Invalid decimal format")), + } + } +} + +fn parse_to_decimal(input: &str) -> Result { + let multiplier = if input.ends_with("kB") { + 1_000 + } else if input.ends_with("MB") { + 1_000_000 + } else if input.ends_with("GB") { + 1_000_000_000 + } else if input.ends_with("KiB") { + 1_000 + } else if input.ends_with("MiB") { + 1_000_000 + } else if input.ends_with("GiB") { + 1_000_000_000 + } else { + 1 + }; + + let number_part: &str = input.trim_end_matches(|c: char| !c.is_numeric() && c != '.'); + let value = Decimal::from_str(number_part)?; + + Ok(value * Decimal::from(multiplier)) +} + +impl DockerStats { + pub fn post_metrics(&self, metrics: &DockerMetrics) { + metrics + .container_cpu_perc + .with_label_values(&[&self.name]) + .set( + self.cpu_perc + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_mem_percentage + .with_label_values(&[&self.name]) + .set( + self.mem_perc + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_mem_used + .with_label_values(&[&self.name]) + .set( + self.mem_usage + .used + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_mem_available + .with_label_values(&[&self.name]) + .set( + self.mem_usage + .total + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_block_io_read + .with_label_values(&[&self.name]) + .set( + self.block_io + .read + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_block_io_write + .with_label_values(&[&self.name]) + .set( + self.block_io + .write + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_net_io_received + .with_label_values(&[&self.name]) + .set( + self.net_io + .received + .to_string() + .parse::() + .expect("Failed to parse"), + ); + metrics + .container_net_io_transmitted + .with_label_values(&[&self.name]) + .set( + self.net_io + .transmitted + .to_string() + .parse::() + .expect("Failed to parse"), + ); + } +} diff --git a/src/error.rs b/src/error.rs new file mode 100644 index 0000000..38c06f6 --- /dev/null +++ b/src/error.rs @@ -0,0 +1,15 @@ +use thiserror::Error; + +#[derive(Error, Debug)] +pub enum SystemExporterError { + #[error(transparent)] + Hyper(#[from] hyper::Error), + #[error(transparent)] + SerdeJson(#[from] serde_json::Error), + #[error(transparent)] + Prometheus(#[from] prometheus::Error), + #[error(transparent)] + AddrParse(#[from] std::net::AddrParseError), +} + +pub type SystemExporterResult = Result; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..9ee6813 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,45 @@ +use crate::{error::SystemExporterResult, metrics::Metrics}; +use clap::Parser; +use std::{sync::Arc, time::Duration}; +use crate::docker::collector::DockerCollector; +use crate::server::Server; + +mod docker; +mod error; +mod metrics; +mod server; + +#[derive(Parser, Debug)] +#[command(author, version, about, long_about = None)] +pub struct Args { + /// The address to bind the metrics server on + #[arg(long, default_value = "0.0.0.0")] + pub bind_address: String, + /// The port to bind the metrics server to + #[arg(long, default_value_t = 45454)] + pub bind_port: u32, + /// The metrics registry prefix + #[arg(long, default_value = "system_exporter")] + pub metrics_prefix: String, + /// The interval to poll docker stats + #[arg(long, default_value_t = 5)] + pub docker_stats_seconds: u64, +} + +#[tokio::main] +async fn main() -> SystemExporterResult<()> { + let args = Args::parse(); + + let metrics = Arc::new(Metrics::new(args.metrics_prefix.as_str())?); + let server = Server::new(&args, metrics.clone())?; + let collector = DockerCollector::new(metrics); + + tokio::spawn(async move { + loop { + let _ = collector.poll(); + tokio::time::sleep(Duration::from_secs(args.docker_stats_seconds)).await; + } + }); + + server.serve().await +} diff --git a/src/metrics.rs b/src/metrics.rs new file mode 100644 index 0000000..f7a7edc --- /dev/null +++ b/src/metrics.rs @@ -0,0 +1,18 @@ +use crate::{docker::metrics::DockerMetrics, error::SystemExporterResult}; +use prometheus::Registry; +use std::sync::Arc; + +pub struct Metrics { + pub registry: Arc, + pub docker: DockerMetrics, +} + +impl Metrics { + pub fn new(prefix: &str) -> SystemExporterResult { + let registry = Registry::new_custom(Some(prefix.to_string()), None)?; + Ok(Self { + docker: DockerMetrics::new(registry.clone())?, + registry: Arc::new(registry), + }) + } +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..b027791 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,49 @@ +use std::{net::SocketAddr, sync::Arc}; + +use crate::{error::SystemExporterResult, Args}; +use axum::{routing::get, Extension, Router}; +use http::{Response, StatusCode}; +use hyper::Body; +use prometheus::{Encoder, TextEncoder}; +use tower_http::add_extension::AddExtensionLayer; + +use crate::metrics::Metrics; + +pub struct Server { + pub metrics: Arc, + bind_addr: SocketAddr, +} + +impl Server { + pub fn new(args: &Args, metrics: Arc) -> SystemExporterResult { + let bind_addr: SocketAddr = format!("{}:{}", args.bind_address, args.bind_port).parse()?; + Ok(Self { metrics, bind_addr }) + } +} + +impl Server { + pub async fn serve(&self) -> SystemExporterResult<()> { + let app = Router::new() + .route("/metrics", get(get_metrics)) + .layer(AddExtensionLayer::new(self.metrics.clone())); + + Ok(axum::Server::bind(&self.bind_addr) + .serve(app.into_make_service()) + .await?) + } +} + +async fn get_metrics( + Extension(metrics): Extension>, +) -> Result, StatusCode> { + let mut buffer = vec![]; + let encoder = TextEncoder::new(); + let metric_families = metrics.registry.gather(); + encoder + .encode(&metric_families, &mut buffer) + .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?; + let metrics_str = String::from_utf8(buffer).map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?; + let mut response = Response::new(Body::from(metrics_str)); + *response.status_mut() = StatusCode::OK; + Ok(response) +}