Extensible, asynchronous retry behaviours
License: MIT License
Asynchronous retry strategies based on futures.
Add this to your Cargo.toml:
[dependencies]
futures-backoff = "0.1"extern crate futures;
extern crate futures_backoff;
use futures::{Future, future};
use futures_backoff::retry;
fn main() {
let future = retry(|| {
// do some real-world stuff here...
future::ok::<u32, ::std::io::Error>(42)
});
let result = future.wait();
assert_eq!(result, Ok(42));
}
Thanks for this library. I've taken a look at a number of retry libraries for rust futures and this by far has the most straightforward and well thought out interface.
I'm working this into a client library and am trying to implement a Condition type that debug logs how many time an operation was retried. Here's a sketch
/// Predicate trait that determines if an impl
/// type is retryable
trait Retry {
/// Return true if type is retryable
fn retryable(&self) -> bool;
}
struct Counter(u16);
impl<R> Condition<R> for Counter
where
R: Retry,
{
fn should_retry(
&mut self,
error: &R,
) -> bool {
log::debug!("retrying operation {}", self.0);
self.0 += 1;
error.retryable()
}
}Strategy::exponential(duration)
.with_max_retries(5)
.with_jitter(true)
.retry_if(
operation,
Counter(0)
)when I try a forced failing operation, I see some suprising output.
retrying operation 0
retrying operation 0
retrying operation 1
retrying operation 2
retrying operation 3
retrying operation 4
retrying operation 5
I'm wondering if this is expected.
What I expected was that the condition would be invoked once per future failure.
Hi,
When I attempt to use https://github.com/sozu-proxy/lapin-futures-tls/tree/master/native-tls with this crate, I get the following error.
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: SpawnError { is_shutdown: true }', src/libcore/result.rs:997:5
note: Run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
Not sure why this is happening because I am sure that I am in a tokio runtime.
My Code:
let strategy = Strategy::fibonacci(Duration::from_secs(2))
.with_max_retries(10);
let gr = group.clone();
let (amqp, _) = strategy.retry(|| {
amqp_uri.connect_cancellable(|err| {
eprintln!("Error encountered while attempting heartbeat. {}", err);
})
}).wait().unwrap();
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