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|
use std::{collections::BTreeMap, sync::Arc, time::Duration};
use anyhow::Result;
use bollard::Docker;
use config::CONFIG;
use opentelemetry_otlp::{MetricExporter, Protocol, WithExportConfig};
use opentelemetry_sdk::metrics::{PeriodicReader, SdkMeterProvider};
use tokio::task::JoinHandle;
use tokio::time::MissedTickBehavior;
use tokio_util::sync::CancellationToken;
mod config;
mod stats_task;
fn setup_otlp() -> Result<SdkMeterProvider> {
let metric_exporter = match CONFIG.otlp_protocol {
Protocol::HttpBinary | Protocol::HttpJson => {
let builder = MetricExporter::builder()
.with_http()
.with_protocol(CONFIG.otlp_protocol);
let builder = if let Some(e) = &CONFIG.otlp_endpoint {
builder.with_endpoint(e)
} else {
builder
};
builder.build()?
}
Protocol::Grpc => {
let builder = MetricExporter::builder()
.with_tonic()
.with_protocol(Protocol::Grpc);
let builder = if let Some(e) = &CONFIG.otlp_endpoint {
builder.with_endpoint(e.as_str())
} else {
builder
};
builder.build()?
}
};
// if we have a CSPY_OTLP_INTERVAL, apply that,
// else use default behaviour which reads OTEL_METRIC_EXPORT_INTERVAL else uses one minute as the interval
// note that a PeriodicReader without setting .with_interval is equivalent to using .with_periodic_exporter
let reader_builder = PeriodicReader::builder(metric_exporter);
let reader_builder = if let Some(interval) = CONFIG.otlp_export_interval {
reader_builder.with_interval(Duration::from_millis(interval))
} else {
reader_builder
};
Ok(SdkMeterProvider::builder()
.with_reader(reader_builder.build())
.build())
}
#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<()> {
// open a docker connection
let docker = Arc::new(if let Some(path) = &CONFIG.docker_socket {
Docker::connect_with_socket(path, 60, bollard::API_DEFAULT_VERSION)?
} else {
Docker::connect_with_local_defaults()?
});
// connect the OTLP exporter
let meter_provider = Arc::new(setup_otlp()?);
// fetch-report loop with graceful shutdown
let shutdown_token = CancellationToken::new();
let st2 = shutdown_token.clone(); // to be moved into the task
tokio::spawn(async move {
tokio::signal::ctrl_c()
.await
.expect("Failed to setup ctrl-c handler");
st2.cancel();
});
let mut container_search_interval = tokio::time::interval(Duration::from_millis(CONFIG.otlp_export_interval.unwrap_or(6000)) / 2);
container_search_interval.set_missed_tick_behavior(MissedTickBehavior::Skip);
let mut tasks: BTreeMap<String, JoinHandle<()>> = BTreeMap::new();
loop {
tokio::select! {
_ = container_search_interval.tick() => {}
_ = shutdown_token.cancelled() => { break }
}
let containers = docker.list_containers::<String>(None).await?;
let mut containers: Vec<_> = containers.into_iter().filter(|c| c.id.is_some()).collect();
containers.sort_by(|a, b| a.id.as_ref().unwrap().cmp(b.id.as_ref().unwrap()));
let mut to_remove = Vec::new();
for (cont, handle) in &tasks {
// funny O(n^2) loop
if containers
.binary_search_by(|c| c.id.as_ref().unwrap().cmp(cont))
.is_err()
{
handle.abort();
to_remove.push(cont.clone());
}
}
for cont in to_remove.into_iter() {
tasks.remove(&cont);
}
// now, add any new ones
for cont in containers {
let id_string = cont.id.as_ref().unwrap();
if !tasks.contains_key(id_string) {
// all this string cloning hurts me
tasks.insert(
id_string.clone(),
stats_task::launch_stats_task(cont, docker.clone(), meter_provider.clone()),
);
}
}
}
// abort all stats tasks
for task in tasks.into_values() {
task.abort();
}
println!("clean shutdown.");
Ok(())
}
|
