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