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use ::prelude::*;
use std::collections::HashSet;
impl Repository {
fn delete_bundle(&mut self, id: u32) -> Result<(), RepositoryError> {
if let Some(bundle) = self.bundle_map.remove(id) {
try!(self.bundles.delete_bundle(&bundle));
Ok(())
} else {
Err(IntegrityError::MissingBundleId(id).into())
}
}
pub fn vacuum(&mut self, ratio: f32, combine: bool, force: bool) -> Result<(), RepositoryError> {
try!(self.flush());
info!("Locking repository");
try!(self.write_mode());
let _lock = try!(self.lock(true));
// analyze_usage will set the dirty flag
info!("Analyzing chunk usage");
let usage = try!(self.analyze_usage());
let mut data_total = 0;
let mut data_used = 0;
for bundle in usage.values() {
data_total += bundle.info.encoded_size;
data_used += bundle.get_used_size();
}
info!("Usage: {} of {}, {:.1}%", to_file_size(data_used as u64), to_file_size(data_total as u64), data_used as f32/data_total as f32*100.0);
let mut rewrite_bundles = HashSet::new();
let mut reclaim_space = 0;
for (id, bundle) in &usage {
if bundle.get_usage_ratio() <= ratio {
rewrite_bundles.insert(*id);
reclaim_space += bundle.get_unused_size();
}
}
if combine {
let mut small_meta = vec![];
let mut small_data = vec![];
for (id, bundle) in &usage {
if bundle.info.encoded_size * 4 < self.config.bundle_size {
match bundle.info.mode {
BundleMode::Meta => small_meta.push(*id),
BundleMode::Data => small_data.push(*id),
}
}
}
if small_meta.len() >= 2 {
for bundle in small_meta {
rewrite_bundles.insert(bundle);
}
}
if small_data.len() >= 2 {
for bundle in small_data {
rewrite_bundles.insert(bundle);
}
}
}
info!("Reclaiming {} by rewriting {} bundles", to_file_size(reclaim_space as u64), rewrite_bundles.len());
if !force {
self.dirty = false;
return Ok(())
}
for id in ProgressIter::new("rewriting bundles", rewrite_bundles.len(), rewrite_bundles.iter()) {
let bundle = &usage[id];
let bundle_id = self.bundle_map.get(*id).unwrap();
let chunks = try!(self.bundles.get_chunk_list(&bundle_id));
let mode = usage[id].info.mode;
for (chunk, &(hash, _len)) in chunks.into_iter().enumerate() {
if !bundle.chunk_usage.get(chunk) {
try!(self.index.delete(&hash));
continue
}
let data = try!(self.bundles.get_chunk(&bundle_id, chunk));
try!(self.put_chunk_override(mode, hash, &data));
}
}
try!(self.flush());
info!("Checking index");
self.index.walk::<_, ()>(|hash, location| {
if rewrite_bundles.contains(&location.bundle) {
panic!("Removed bundle is still referenced in index: hash:{}, bundle:{}, chunk:{}", hash, location.bundle, location.chunk);
}
Ok(())
}).ok();
info!("Deleting {} bundles", rewrite_bundles.len());
for id in rewrite_bundles {
try!(self.delete_bundle(id));
}
try!(self.save_bundle_map());
self.dirty = false;
Ok(())
}
}