fn evict_to_capacity()

in chunk_cache/src/disk.rs [69:101]

• 28 lines of code
• 3 McCabe index (conditional complexity)

    fn evict_to_capacity(
        &mut self,
        max_total_bytes: u64,
    ) -> Result<Vec<(Key, VerificationCell<CacheItem>)>, ChunkCacheError> {
        let original_total_bytes = self.total_bytes;
        let mut ret = Vec::new();

        while self.total_bytes > max_total_bytes {
            let Some((key, idx)) = self.random_item() else {
                error!("attempted to evict item, but no item could be found to be evicted");
                break;
            };
            let items = self.inner.get_mut(&key).ok_or(ChunkCacheError::Infallible)?;
            let cache_item = items.swap_remove(idx);
            let len = cache_item.len;

            if items.is_empty() {
                self.inner.remove(&key);
            }

            ret.push((key, cache_item));

            self.total_bytes -= len;
            self.num_items -= 1;
        }
        debug!(
            "cache evicting {} items totaling {}",
            ret.len(),
            output_bytes(original_total_bytes - self.total_bytes)
        );

        Ok(ret)
    }