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use futures::future::BoxFuture;
use crate::append::AppendError;
use crate::error::ShutDown;
use crate::error::ShutDownOr;
use crate::invocation::Invocation;
pub trait RetryPolicy: 'static {
type Invocation: Invocation;
type Error;
type StaticError;
type Future: std::future::Future<Output = Result<(), Self::Error>>;
fn eval(&mut self, error: AppendError<Self::Invocation>) -> Self::Future;
}
impl<I: Invocation, E: 'static, F: 'static> RetryPolicy
for Box<
dyn RetryPolicy<
Invocation = I,
Error = E,
StaticError = F,
Future = BoxFuture<'static, Result<(), E>>,
> + Send,
>
{
type Invocation = I;
type Error = E;
type StaticError = F;
type Future = BoxFuture<'static, Result<(), Self::Error>>;
fn eval(&mut self, error: AppendError<Self::Invocation>) -> Self::Future {
(**self).eval(error)
}
}
#[derive(Copy, Debug)]
pub struct DoNotRetry<I>(crate::util::PhantomSend<I>);
impl<I> DoNotRetry<I> {
pub fn new() -> Self {
Self(crate::util::PhantomSend::new())
}
}
impl<I> Default for DoNotRetry<I> {
fn default() -> Self {
Self(Default::default())
}
}
impl<I> Clone for DoNotRetry<I> {
fn clone(&self) -> Self {
Self(self.0.clone())
}
}
impl<I: Invocation> RetryPolicy for DoNotRetry<I> {
type Invocation = I;
type Error = AppendError<Self::Invocation>;
type StaticError = AppendError<Self::Invocation>;
type Future = futures::future::Ready<Result<(), Self::Error>>;
fn eval(&mut self, err: AppendError<Self::Invocation>) -> Self::Future {
futures::future::ready(Err(err))
}
}
#[derive(thiserror::Error)]
#[error("append was aborted")]
pub struct AbortedError<I: Invocation>(AppendError<I>);
impl<I: Invocation> std::fmt::Debug for AbortedError<I> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_tuple("AbortedError").field(&self.0).finish()
}
}
impl<I: Invocation> From<ShutDown> for AbortedError<I> {
fn from(shut_down: ShutDown) -> Self {
Self(shut_down.into())
}
}
impl<I: Invocation> From<ShutDownOr<AbortedError<I>>> for AbortedError<I> {
fn from(err: ShutDownOr<AbortedError<I>>) -> Self {
match err {
ShutDownOr::Other(err) => err,
ShutDownOr::ShutDown => Self::from(ShutDown),
}
}
}
#[cfg(feature = "backoff")]
pub use cfg_backoff::RetryWithBackoff;
#[cfg(feature = "backoff")]
mod cfg_backoff {
use std::marker::PhantomData;
use backoff::backoff::Backoff;
use backoff::exponential::ExponentialBackoff;
use futures::future::BoxFuture;
use futures::FutureExt;
use crate::append::AppendArgs;
use crate::append::AppendError;
use crate::invocation::Invocation;
use super::AbortedError;
use super::RetryPolicy;
pub struct RetryWithBackoff<B, I>(B, PhantomData<I>);
impl<C, I> Default for RetryWithBackoff<ExponentialBackoff<C>, I>
where
C: backoff::Clock + Default + Send + 'static,
I: Invocation + Send,
{
fn default() -> Self {
Self(ExponentialBackoff::default(), Default::default())
}
}
impl<B: Backoff, I> From<B> for RetryWithBackoff<B, I> {
fn from(backoff: B) -> Self {
Self(backoff, std::marker::PhantomData)
}
}
impl<C, I> From<ExponentialBackoff<C>> for AppendArgs<I, RetryWithBackoff<ExponentialBackoff<C>, I>>
where
C: backoff::Clock + Send + 'static,
I: Invocation + Send,
{
fn from(backoff: ExponentialBackoff<C>) -> Self {
RetryWithBackoff::from(backoff).into()
}
}
impl<B: Backoff + Send + 'static, I: Invocation + Send> RetryPolicy for RetryWithBackoff<B, I> {
type Invocation = I;
type Error = AbortedError<I>;
type StaticError = AbortedError<I>;
type Future = BoxFuture<'static, Result<(), Self::Error>>;
fn eval(&mut self, err: AppendError<Self::Invocation>) -> Self::Future {
let next_backoff = self.0.next_backoff();
async move {
if let Some(d) = next_backoff {
futures_timer::Delay::new(d).await;
Ok(())
} else {
Err(AbortedError(err))
}
}
.boxed()
}
}
}