321 update the circuit breaker retries logic #336
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Blindspot22
added
enhancement
Blindspot22
requested review from
Hermann-Core,
IngridPuppet and
Christiantyemele
and removed request for
Hermann-Core
|
Still adjusting my test. Should be done by the end of the day |
…e-reliability-features-eg-simulated-network-failures-retries-e3
Hermann-Core
requested changes
Mar 5, 2025
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The goal of this ticket was to adjust the retry logic for the futures. The future should initially fail once before the specified number of retries is executed. Currently, the implementation only retries the future the specified number of times, without accounting for the initial failure. For example, if the retry count is set to 3, the future is retried only 3 times instead of the expected 4.
I should look first where the number of retries is checked.
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| pub fn call<F, Fut, T, E>(&self, mut f: F) -> impl Future<Output = Result<T, Error<E>>> | ||
| where | ||
| F: FnMut() -> Fut, | ||
| Fut: Future<Output = Result<T, E>>, | ||
| { | ||
| ResultFuture { | ||
| factory: f, | ||
| state: State::Initial, | ||
| breaker: self.clone(), | ||
| let breaker = self.clone(); | ||
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| async move { | ||
| if !breaker.should_allow_call() { | ||
| return Err(Error::CircuitOpen); | ||
| } | ||
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| let mut attempts = 0; | ||
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| loop { | ||
| attempts += 1; | ||
| let result = f().await; | ||
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| match result { | ||
| Ok(val) => { | ||
| breaker.success(); | ||
| return Ok(val); | ||
| } | ||
| Err(err) => { | ||
| breaker.failure(); | ||
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| if attempts >= breaker.inner.lock().max_retries { | ||
| return Err(Error::Inner(err)); | ||
| } | ||
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| if !breaker.should_allow_call() { | ||
| return Err(Error::CircuitOpen); | ||
| } | ||
| } | ||
| } | ||
| } |
There was a problem hiding this comment.
Don't change the implementation logic. That is not the aim of the ticket.
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| let attempts_clone = attempts.clone(); | ||
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| let retry_operation = || { | ||
| let attempts = attempts_clone.clone(); | ||
| async move { | ||
| attempts.fetch_add(1, Ordering::AcqRel); | ||
| Err::<(), ()>(()) // Simulate a failure | ||
| } |
There was a problem hiding this comment.
You don't need to change anything here.
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| // #[tokio::test] | ||
| // async fn test_exponential_backoff() { | ||
| // let breaker = CircuitBreaker::new() | ||
| // .retries(3) | ||
| // .exponential_backoff(Duration::from_millis(100)); | ||
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| // let start = Instant::now(); | ||
| // let _ = breaker.call(|| async { Err::<(), ()>(()) }).await; | ||
| // let elapsed = start.elapsed(); | ||
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| // Log the elapsed time for debugging | ||
| // println!("Elapsed time: {:?}", elapsed); | ||
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| // After the first failure, we wait 100ms before retrying | ||
| // After the second failure, we wait 200ms before retrying | ||
| // After the third failure, we should not retry anymore, and the circuit should open | ||
| // assert!(elapsed >= Duration::from_millis(290) && elapsed < Duration::from_millis(600)); // Widen range further | ||
| // assert!(!breaker.should_allow_call()); // Circuit should be open after 3 retries | ||
| // } | ||
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| // #[tokio::test] | ||
| // async fn test_half_open_state_failure() { | ||
| // let breaker = CircuitBreaker::new() | ||
| // .retries(1) // Allow 1 retry | ||
| // .reset_timeout(Duration::from_millis(100)); | ||
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| // Trigger a failure to open the circuit | ||
| // let _ = breaker.call(|| async { Err::<(), ()>(()) }).await; | ||
| // assert!(!breaker.should_allow_call()); // Circuit should be open | ||
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| // Wait for the reset timeout to allow the circuit to move to half-open state | ||
| // sleep(Duration::from_millis(150)).await; | ||
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| // Verify the circuit is in the half-open state | ||
| // assert!(breaker.should_allow_call()); | ||
| // assert_eq!(breaker.inner.lock().state, CircuitState::HalfOpen); | ||
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| // Call again and trigger another failure | ||
| // let result = breaker.call(|| async { Err::<(), ()>(()) }).await; | ||
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| // The circuit should open again after this failure | ||
| // assert_eq!(result, Err(Error::CircuitOpen)); // Circuit should be open again after failure | ||
| // assert_eq!(breaker.inner.lock().state, CircuitState::Open); | ||
| // } |
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Why have you commented out the tests?
There was a problem hiding this comment.
No don't worry about that, I have already un-commented the test. I was just testing out something.
I will do a new push with all your suggestions 👍
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