feat: add drifter

Signed-off-by: kjuulh <contact@kjuulh.io>
This commit is contained in:
Kasper Juul Hermansen 2024-08-01 21:53:58 +02:00
commit 03f3bb7493
Signed by: kjuulh
GPG Key ID: D85D7535F18F35FA
7 changed files with 845 additions and 0 deletions

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.drone.yml Normal file
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kind: template
load: cuddle-rust-lib-plan.yaml

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.gitignore vendored Normal file
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target/
.cuddle/

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crates/drift/Cargo.toml Normal file
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crates/drift/src/lib.rs Normal file
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use std::{sync::Arc, time::Duration};
use async_trait::async_trait;
use std::future::Future;
use tokio::time;
use tokio_util::sync::CancellationToken;
#[derive(Debug, Clone, thiserror::Error)]
pub enum DriftError {}
pub fn schedule<F, Fut>(interval: Duration, func: F) -> CancellationToken
where
F: Fn() -> Fut + Send + Sync + 'static,
Fut: Future<Output = Result<(), DriftError>> + Send + 'static,
{
let drifter = FuncDrifter::new(func);
schedule_drifter(interval, drifter)
}
pub fn schedule_drifter<FDrifter>(interval: Duration, drifter: FDrifter) -> CancellationToken
where
FDrifter: Drifter + Send + 'static,
FDrifter: Clone,
{
let cancellation_token = CancellationToken::new();
tokio::spawn({
let cancellation_token = cancellation_token.clone();
let drifter = drifter.clone();
async move {
let mut wait = interval;
loop {
let child_token = cancellation_token.child_token();
let sleep = time::sleep(wait);
tokio::pin!(sleep);
tokio::select! {
_ = cancellation_token.cancelled() => {
tracing::trace!("stopping drift job");
break
}
_ = &mut sleep => {
let start = std::time::Instant::now();
tracing::debug!("running job");
if let Err(e) = drifter.execute(child_token).await {
tracing::error!("drift job failed with error: {}, stopping routine", e);
cancellation_token.cancel();
continue
}
let elapsed = start.elapsed();
wait = interval.saturating_sub(elapsed);
tracing::debug!("job took: {}ms, waiting: {}ms for next run", elapsed.as_millis(), wait.as_millis());
}
}
}
}
});
cancellation_token
}
struct FuncDrifter<F, Fut>
where
F: Fn() -> Fut + Send + Sync + 'static,
Fut: Future<Output = Result<(), DriftError>> + Send + 'static,
{
func: Arc<F>,
}
impl<F, Fut> Clone for FuncDrifter<F, Fut>
where
F: Fn() -> Fut + Send + Sync + 'static,
Fut: Future<Output = Result<(), DriftError>> + Send + 'static,
{
fn clone(&self) -> Self {
Self {
func: self.func.clone(),
}
}
}
impl<F, Fut> FuncDrifter<F, Fut>
where
F: Fn() -> Fut + Send + Sync + 'static,
Fut: Future<Output = Result<(), DriftError>> + Send + 'static,
{
fn new(func: F) -> Self {
Self {
func: Arc::new(func),
}
}
async fn execute_func(&self) -> anyhow::Result<()> {
if let Err(e) = (self.func)().await {
anyhow::bail!(e)
}
Ok(())
}
}
#[async_trait]
impl<F, Fut> Drifter for FuncDrifter<F, Fut>
where
F: Fn() -> Fut + Send + Sync,
Fut: Future<Output = Result<(), DriftError>> + Send,
{
async fn execute(&self, token: CancellationToken) -> anyhow::Result<()> {
self.execute_func().await?;
Ok(())
}
}
#[async_trait]
pub trait Drifter {
async fn execute(&self, token: CancellationToken) -> anyhow::Result<()>;
}
#[cfg(test)]
mod tests {
use std::sync::{Arc, Mutex};
use tracing_test::traced_test;
use super::*;
#[tokio::test]
async fn test_can_schedule_jobs() -> anyhow::Result<()> {
let token = schedule(Duration::from_millis(50), || async move { Ok(()) });
tokio::time::sleep(Duration::from_millis(150)).await;
assert!(!token.is_cancelled());
Ok(())
}
#[derive(Default, Clone)]
pub struct CounterDrifter {
counter: Arc<Mutex<usize>>,
}
#[async_trait]
impl Drifter for CounterDrifter {
async fn execute(&self, _cancellation_token: CancellationToken) -> anyhow::Result<()> {
let mut counter = self.counter.lock().unwrap();
*counter += 1;
Ok(())
}
}
#[tokio::test]
async fn test_can_call_job_multiple_times() -> anyhow::Result<()> {
let drifter = CounterDrifter::default();
let token = schedule_drifter(Duration::from_millis(50), drifter.clone());
tokio::time::sleep(Duration::from_millis(150)).await;
assert!(!token.is_cancelled());
let counter = drifter.counter.lock().unwrap();
assert!(*counter >= 2);
Ok(())
}
#[tokio::test]
async fn test_cancelled() -> anyhow::Result<()> {
let drifter = CounterDrifter::default();
let token = schedule_drifter(Duration::from_millis(50), drifter.clone());
tokio::time::sleep(Duration::from_millis(75)).await;
token.cancel();
assert!(token.is_cancelled());
let counter = drifter.counter.lock().unwrap();
assert_eq!(*counter, 1);
Ok(())
}
#[tokio::test]
#[traced_test]
async fn test_calls_trace_on_start_and_end() -> anyhow::Result<()> {
let token = schedule(Duration::from_millis(10), || async {
tokio::time::sleep(std::time::Duration::from_nanos(1000)).await;
Ok(())
});
tokio::time::sleep(Duration::from_millis(150)).await;
assert!(!token.is_cancelled());
assert!(logs_contain("running job"));
assert!(logs_contain("job took:"));
Ok(())
}
}

17
cuddle.yaml Normal file
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# yaml-language-server: $schema=https://git.front.kjuulh.io/kjuulh/cuddle/raw/branch/main/schemas/base.json
base: "git@git.front.kjuulh.io:kjuulh/cuddle-rust-lib-plan.git"
vars:
service: "drift"
registry: kasperhermansen
please:
project:
owner: kjuulh
repository: "drift"
branch: main
settings:
api_url: "https://git.front.kjuulh.io"
actions:
rust: