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|
use std::path::PathBuf;
use crate::{store::load_index, types::IndexAndPacks, Store};
/// A record of a structural element of an object database.
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum Record {
/// A loose object database.
LooseObjectDatabase {
/// The root of the object database.
objects_directory: PathBuf,
/// The amount of object files.
num_objects: usize,
},
/// A pack index file
Index {
/// The location of the index file,
path: PathBuf,
/// Whether or not the index is mapped into memory.
state: IndexState,
},
/// A multi-index file
MultiIndex {
/// The location of the multi-index file,
path: PathBuf,
/// Whether or not the index is mapped into memory.
state: IndexState,
},
/// An empty slot was encountered, this is possibly happening as the ODB changes during query with
/// a file being removed.
Empty,
}
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
/// Possible stats of pack indices.
pub enum IndexState {
/// The index is active in memory because a mapping exists.
Loaded,
/// The index couldn't be unloaded as it was still in use, but that can happen another time.
Disposable,
/// The index isn't loaded/memory mapped.
Unloaded,
}
impl Store {
/// Return information about all files known to us as well as their loading state.
///
/// Note that this call is expensive as it gathers additional information about loose object databases.
/// Note that it may change as we collect information due to the highly volatile nature of the
/// implementation. The likelihood of actual changes is low though as these still depend on something
/// changing on disk and somebody reading at the same time.
pub fn structure(&self) -> Result<Vec<Record>, load_index::Error> {
let index = self.index.load();
if !index.is_initialized() {
self.consolidate_with_disk_state(true, false /*load one new index*/)?;
}
let index = self.index.load();
let mut res: Vec<_> = index
.loose_dbs
.iter()
.map(|db| Record::LooseObjectDatabase {
objects_directory: db.path.clone(),
num_objects: db.iter().count(),
})
.collect();
for slot in index.slot_indices.iter().map(|idx| &self.files[*idx]) {
let files = slot.files.load();
let record = match &**files {
Some(index) => {
let state = if index.is_disposable() {
IndexState::Disposable
} else if index.index_is_loaded() {
IndexState::Loaded
} else {
IndexState::Unloaded
};
match index {
IndexAndPacks::Index(b) => Record::Index {
path: b.index.path().into(),
state,
},
IndexAndPacks::MultiIndex(b) => Record::MultiIndex {
path: b.multi_index.path().into(),
state,
},
}
}
None => Record::Empty,
};
res.push(record);
}
Ok(res)
}
/// Provide a list of all `objects` directories of `alternate` object database paths.
/// This list might be empty if there are no alternates.
///
/// Read more about alternates in the documentation of the [`resolve`][crate::alternate::resolve()] function.
pub fn alternate_db_paths(&self) -> Result<Vec<PathBuf>, load_index::Error> {
let index = self.index.load();
if !index.is_initialized() {
self.consolidate_with_disk_state(true, false /*load one new index*/)?;
}
let index = self.index.load();
Ok(index
.loose_dbs
.iter()
.skip(
1, /* first odb is always the primary one, all the follows is alternates */
)
.map(|db| db.path.clone())
.collect())
}
}
|
