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use std::fmt::Debug;
use std::io::ErrorKind;
use std::io::Result;
use std::sync::Arc;
use async_trait::async_trait;
use backon::Retryable;
use crate::ops::OpCreate;
use crate::ops::OpDelete;
use crate::ops::OpList;
use crate::ops::OpPresign;
use crate::ops::OpRead;
use crate::ops::OpStat;
use crate::ops::OpWrite;
use crate::ops::PresignedRequest;
use crate::Accessor;
use crate::AccessorMetadata;
use crate::BytesReader;
use crate::BytesWriter;
use crate::DirStreamer;
use crate::Layer;
use crate::ObjectMetadata;
impl<B: 'static> Layer for B
where
B: backon::Backoff + Debug + Send + Sync,
{
fn layer(&self, inner: Arc<dyn Accessor>) -> Arc<dyn Accessor> {
Arc::new(RetryableAccessor::create(inner, self.clone()))
}
}
#[derive(Debug)]
struct RetryableAccessor<B: backon::Backoff + Debug + Send + Sync> {
inner: Arc<dyn Accessor>,
backoff: B,
}
impl<B> RetryableAccessor<B>
where
B: backon::Backoff + Debug + Send + Sync,
{
fn create(inner: Arc<dyn Accessor>, backoff: B) -> Self {
Self { inner, backoff }
}
}
#[async_trait]
impl<B> Accessor for RetryableAccessor<B>
where
B: backon::Backoff + Debug + Send + Sync,
{
fn metadata(&self) -> AccessorMetadata {
self.inner.metadata()
}
async fn create(&self, args: &OpCreate) -> Result<()> {
{ || self.inner.create(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
async fn read(&self, args: &OpRead) -> Result<BytesReader> {
{ || self.inner.read(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
async fn write(&self, args: &OpWrite) -> Result<BytesWriter> {
{ || self.inner.write(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
async fn stat(&self, args: &OpStat) -> Result<ObjectMetadata> {
{ || self.inner.stat(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
async fn delete(&self, args: &OpDelete) -> Result<()> {
{ || self.inner.delete(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
async fn list(&self, args: &OpList) -> Result<DirStreamer> {
{ || self.inner.list(args) }
.retry(self.backoff.clone())
.with_error_fn(|e| e.kind() == ErrorKind::Interrupted)
.await
}
fn presign(&self, args: &OpPresign) -> Result<PresignedRequest> {
self.inner.presign(args)
}
}
#[cfg(test)]
mod tests {
use std::io;
use std::sync::Arc;
use std::time::Duration;
use anyhow::anyhow;
use async_trait::async_trait;
use backon::ConstantBackoff;
use tokio::sync::Mutex;
use crate::error::other;
use crate::ops::OpRead;
use crate::Accessor;
use crate::BytesReader;
use crate::Operator;
#[derive(Debug, Clone, Default)]
struct MockService {
attempt: Arc<Mutex<usize>>,
}
#[async_trait]
impl Accessor for MockService {
async fn read(&self, args: &OpRead) -> std::io::Result<BytesReader> {
let mut attempt = self.attempt.lock().await;
*attempt += 1;
match args.path() {
"retryable_error" => Err(io::Error::new(
io::ErrorKind::Interrupted,
anyhow!("retryable_error"),
)),
_ => Err(other(anyhow!("not_retryable_error"))),
}
}
}
#[tokio::test]
async fn test_retry_retryable_error() -> anyhow::Result<()> {
let srv = Arc::new(MockService::default());
let backoff = ConstantBackoff::default()
.with_delay(Duration::from_micros(1))
.with_max_times(10);
let op = Operator::new(srv.clone()).layer(backoff);
let result = op.object("retryable_error").read().await;
assert!(result.is_err());
assert_eq!(result.unwrap_err().to_string(), "retryable_error");
assert_eq!(*srv.attempt.lock().await, 11);
Ok(())
}
#[tokio::test]
async fn test_retry_not_retryable_error() -> anyhow::Result<()> {
let srv = Arc::new(MockService::default());
let backoff = ConstantBackoff::default();
let op = Operator::new(srv.clone()).layer(backoff);
let result = op.object("not_retryable_error").read().await;
assert!(result.is_err());
assert_eq!(result.unwrap_err().to_string(), "not_retryable_error");
assert_eq!(*srv.attempt.lock().await, 1);
Ok(())
}
}