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repo: split commit_id and change_id indices

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The goal is to replace the commit_id index with ReadonlyIndex to save the
initialization cost, but this also helps to fix root id handling.
This commit is contained in:
Yuya Nishihara 2023-01-20 20:49:51 +09:00
parent 8c0f7d7707
commit 1d2642de1e
1 changed files with 34 additions and 19 deletions
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53
lib/src/repo.rs
View file

@ -18,7 +18,7 @@ use std::io::ErrorKind;
use std::ops::Bound::{Excluded, Unbounded};
use std::path::{Path, PathBuf};
use std::sync::Arc;
use std::{fs, io};
use std::{cmp, fs, io};
use itertools::Itertools;
use once_cell::sync::OnceCell;
@ -102,7 +102,8 @@ pub struct ReadonlyRepo {
index_store: Arc<IndexStore>,
index: OnceCell<Arc<ReadonlyIndex>>,
// TODO: This should eventually become part of the index and not be stored fully in memory.
commit_change_id_index: OnceCell<IdIndex>,
commit_id_index: OnceCell<IdIndex>,
change_id_index: OnceCell<IdIndex>,
view: View,
}
@ -192,7 +193,8 @@ impl ReadonlyRepo {
settings: repo_settings,
index_store,
index: OnceCell::new(),
commit_change_id_index: OnceCell::new(),
commit_id_index: OnceCell::new(),
change_id_index: OnceCell::new(),
view,
}))
}
@ -243,30 +245,41 @@ impl ReadonlyRepo {
})
}
fn commit_change_id_index(&self) -> &IdIndex {
self.commit_change_id_index.get_or_init(|| {
fn commit_id_index(&self) -> &IdIndex {
self.commit_id_index.get_or_init(|| {
// We need to account for rewritten commits as well
let mut id_index = IdIndex::new();
for entry in self.as_repo_ref().index().iter() {
id_index.insert(entry.commit_id().hex().as_bytes(), ());
}
id_index
})
}
fn change_id_index(&self) -> &IdIndex {
self.change_id_index.get_or_init(|| {
let all_visible_revisions = crate::revset::RevsetExpression::all()
.evaluate(self.as_repo_ref(), None)
.unwrap();
let change_hex_iter = all_visible_revisions
.iter()
.map(|index_entry| index_entry.change_id().hex());
// We need to account for rewritten commits as well
let index = self.as_repo_ref().index();
let commit_hex_iter = index
.iter()
.map(|index_entry| index_entry.commit_id().hex());
let mut id_index = IdIndex::new();
for id_hex in itertools::chain(change_hex_iter, commit_hex_iter) {
id_index.insert(id_hex.as_bytes(), ());
for entry in all_visible_revisions.iter() {
id_index.insert(entry.change_id().hex().as_bytes(), ());
}
id_index
})
}
pub fn shortest_unique_prefix_length(&self, target_id_hex: &str) -> usize {
self.commit_change_id_index()
.shortest_unique_prefix_len(target_id_hex.as_bytes())
// For `len = index.shortest(id)`, a prefix of length `len` will disambiguate
// `id` from all other ids in the index. This will be just as true for
// `max(len, anything_else)`, so a max of such lengths will disambiguate in all
// indices.
cmp::max(
self.commit_id_index()
.shortest_unique_prefix_len(target_id_hex.as_bytes()),
self.change_id_index()
.shortest_unique_prefix_len(target_id_hex.as_bytes()),
)
}
pub fn store(&self) -> &Arc<Store> {
@ -523,7 +536,8 @@ impl RepoLoader {
settings: self.repo_settings.clone(),
index_store: self.index_store.clone(),
index: OnceCell::with_value(index),
commit_change_id_index: OnceCell::new(),
commit_id_index: OnceCell::new(),
change_id_index: OnceCell::new(),
view,
};
Arc::new(repo)
@ -554,7 +568,8 @@ impl RepoLoader {
settings: self.repo_settings.clone(),
index_store: self.index_store.clone(),
index: OnceCell::new(),
commit_change_id_index: OnceCell::new(),
commit_id_index: OnceCell::new(),
change_id_index: OnceCell::new(),
view,
};
Arc::new(repo)