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use std::collections::HashMap;
use std::io::Read;
use std::path::PathBuf;
use std::sync::{Arc, RwLock};
use crate::backend;
use crate::backend::{
Backend, BackendResult, ChangeId, CommitId, Conflict, ConflictId, FileId, MillisSinceEpoch,
Signature, SymlinkId, Timestamp, TreeId,
};
use crate::commit::Commit;
use crate::git_backend::GitBackend;
use crate::local_backend::LocalBackend;
use crate::repo_path::RepoPath;
use crate::tree::Tree;
use crate::tree_builder::TreeBuilder;
#[derive(Debug)]
pub struct Store {
backend: Box<dyn Backend>,
root_commit_id: CommitId,
commit_cache: RwLock<HashMap<CommitId, Arc<backend::Commit>>>,
tree_cache: RwLock<HashMap<(RepoPath, TreeId), Arc<backend::Tree>>>,
}
impl Store {
fn new(backend: Box<dyn Backend>) -> Arc<Self> {
let root_commit_id = CommitId::new(vec![0; backend.hash_length()]);
Arc::new(Store {
backend,
root_commit_id,
commit_cache: Default::default(),
tree_cache: Default::default(),
})
}
pub fn init_local(store_path: PathBuf) -> Arc<Self> {
Store::new(Box::new(LocalBackend::init(store_path)))
}
pub fn init_internal_git(store_path: PathBuf) -> Arc<Self> {
Store::new(Box::new(GitBackend::init_internal(store_path)))
}
pub fn init_external_git(store_path: PathBuf, git_repo_path: PathBuf) -> Arc<Self> {
Store::new(Box::new(GitBackend::init_external(
store_path,
git_repo_path,
)))
}
pub fn load_store(store_path: PathBuf) -> Arc<Store> {
let git_target_path = store_path.join("git_target");
let backend: Box<dyn Backend> = if git_target_path.is_file() {
Box::new(GitBackend::load(store_path))
} else {
Box::new(LocalBackend::load(store_path))
};
Store::new(backend)
}
pub fn hash_length(&self) -> usize {
self.backend.hash_length()
}
pub fn git_repo(&self) -> Option<git2::Repository> {
self.backend.git_repo()
}
pub fn empty_tree_id(&self) -> &TreeId {
self.backend.empty_tree_id()
}
pub fn root_commit_id(&self) -> &CommitId {
&self.root_commit_id
}
pub fn root_commit(self: &Arc<Self>) -> Commit {
self.get_commit(&self.root_commit_id).unwrap()
}
pub fn get_commit(self: &Arc<Self>, id: &CommitId) -> BackendResult<Commit> {
let data = self.get_backend_commit(id)?;
Ok(Commit::new(self.clone(), id.clone(), data))
}
fn make_root_commit(&self) -> backend::Commit {
let timestamp = Timestamp {
timestamp: MillisSinceEpoch(0),
tz_offset: 0,
};
let signature = Signature {
name: String::new(),
email: String::new(),
timestamp,
};
let change_id = ChangeId::new(vec![0; 16]);
backend::Commit {
parents: vec![],
predecessors: vec![],
root_tree: self.backend.empty_tree_id().clone(),
change_id,
description: String::new(),
author: signature.clone(),
committer: signature,
is_open: false,
}
}
fn get_backend_commit(&self, id: &CommitId) -> BackendResult<Arc<backend::Commit>> {
{
let read_locked_cached = self.commit_cache.read().unwrap();
if let Some(data) = read_locked_cached.get(id).cloned() {
return Ok(data);
}
}
let commit = if id == self.root_commit_id() {
self.make_root_commit()
} else {
self.backend.read_commit(id)?
};
let data = Arc::new(commit);
let mut write_locked_cache = self.commit_cache.write().unwrap();
write_locked_cache.insert(id.clone(), data.clone());
Ok(data)
}
pub fn write_commit(self: &Arc<Self>, commit: backend::Commit) -> Commit {
let commit_id = self.backend.write_commit(&commit).unwrap();
let data = Arc::new(commit);
{
let mut write_locked_cache = self.commit_cache.write().unwrap();
write_locked_cache.insert(commit_id.clone(), data.clone());
}
Commit::new(self.clone(), commit_id, data)
}
pub fn get_tree(self: &Arc<Self>, dir: &RepoPath, id: &TreeId) -> BackendResult<Tree> {
let data = self.get_backend_tree(dir, id)?;
Ok(Tree::new(self.clone(), dir.clone(), id.clone(), data))
}
fn get_backend_tree(&self, dir: &RepoPath, id: &TreeId) -> BackendResult<Arc<backend::Tree>> {
let key = (dir.clone(), id.clone());
{
let read_locked_cache = self.tree_cache.read().unwrap();
if let Some(data) = read_locked_cache.get(&key).cloned() {
return Ok(data);
}
}
let data = Arc::new(self.backend.read_tree(dir, id)?);
let mut write_locked_cache = self.tree_cache.write().unwrap();
write_locked_cache.insert(key, data.clone());
Ok(data)
}
pub fn write_tree(&self, path: &RepoPath, contents: &backend::Tree) -> BackendResult<TreeId> {
self.backend.write_tree(path, contents)
}
pub fn read_file(&self, path: &RepoPath, id: &FileId) -> BackendResult<Box<dyn Read>> {
self.backend.read_file(path, id)
}
pub fn write_file(&self, path: &RepoPath, contents: &mut dyn Read) -> BackendResult<FileId> {
self.backend.write_file(path, contents)
}
pub fn read_symlink(&self, path: &RepoPath, id: &SymlinkId) -> BackendResult<String> {
self.backend.read_symlink(path, id)
}
pub fn write_symlink(&self, path: &RepoPath, contents: &str) -> BackendResult<SymlinkId> {
self.backend.write_symlink(path, contents)
}
pub fn read_conflict(&self, id: &ConflictId) -> BackendResult<Conflict> {
self.backend.read_conflict(id)
}
pub fn write_conflict(&self, contents: &Conflict) -> BackendResult<ConflictId> {
self.backend.write_conflict(contents)
}
pub fn tree_builder(self: &Arc<Self>, base_tree_id: TreeId) -> TreeBuilder {
TreeBuilder::new(self.clone(), base_tree_id)
}
}
