Change exponential backoff algorithm for federation send (#4597)

* Limit federation send retry interval to one hour

* clippy

* avoid overflow

* change base for exp backoff

* ignore first error

* fix day duration
This commit is contained in:
Nutomic 2024-04-10 01:33:01 +02:00 committed by GitHub
parent 1d0a6ac08f
commit b4670988b5
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GPG key ID: B5690EEEBB952194
2 changed files with 37 additions and 5 deletions

View file

@ -27,7 +27,7 @@ pub extern crate lemmy_utils;
pub use lemmy_utils::LemmyErrorType;
use serde::{Deserialize, Serialize};
use std::time::Duration;
use std::{cmp::min, time::Duration};
#[derive(Debug, Serialize, Deserialize, Clone)]
#[cfg_attr(feature = "full", derive(ts_rs::TS))]
@ -43,7 +43,39 @@ impl Default for SuccessResponse {
}
}
/// how long to sleep based on how many retries have already happened
// TODO: use from_days once stabilized
// https://github.com/rust-lang/rust/issues/120301
const DAY: Duration = Duration::from_secs(24 * 60 * 60);
/// Calculate how long to sleep until next federation send based on how many
/// retries have already happened. Uses exponential backoff with maximum of one day. The first
/// error is ignored.
pub fn federate_retry_sleep_duration(retry_count: i32) -> Duration {
Duration::from_secs_f64(2.0_f64.powf(f64::from(retry_count)))
debug_assert!(retry_count != 0);
if retry_count == 1 {
return Duration::from_secs(0);
}
let retry_count = retry_count - 1;
let pow = 1.25_f64.powf(retry_count.into());
let pow = Duration::try_from_secs_f64(pow).unwrap_or(DAY);
min(DAY, pow)
}
#[cfg(test)]
pub(crate) mod tests {
use super::*;
#[test]
fn test_federate_retry_sleep_duration() {
assert_eq!(Duration::from_secs(0), federate_retry_sleep_duration(1));
assert_eq!(
Duration::new(1, 250000000),
federate_retry_sleep_duration(2)
);
assert_eq!(
Duration::new(2, 441406250),
federate_retry_sleep_duration(5)
);
assert_eq!(DAY, federate_retry_sleep_duration(100));
}
}

View file

@ -6,7 +6,7 @@ CWD="$(cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
cd $CWD/../
PACKAGE="$1"
echo "$PACKAGE"
TEST="$2"
source scripts/start_dev_db.sh
@ -17,7 +17,7 @@ export RUST_BACKTRACE=1
if [ -n "$PACKAGE" ];
then
cargo test -p $PACKAGE --all-features --no-fail-fast
cargo test -p $PACKAGE --all-features --no-fail-fast $TEST
else
cargo test --workspace --no-fail-fast
fi