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use crate::core::MANAGED_FILEPATH;
use crate::directory::error::{DeleteError, IOError, LockError, OpenReadError, OpenWriteError};
use crate::directory::DirectoryLock;
use crate::directory::Lock;
use crate::directory::META_LOCK;
use crate::directory::{ReadOnlySource, WritePtr};
use crate::directory::{WatchCallback, WatchHandle};
use crate::error::DataCorruption;
use crate::Directory;
use crate::Result;
use serde_json;
use std::collections::HashSet;
use std::io;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::result;
use std::sync::RwLockWriteGuard;
use std::sync::{Arc, RwLock};
fn is_managed(path: &Path) -> bool {
path.to_str()
.map(|p_str| !p_str.starts_with('.'))
.unwrap_or(true)
}
#[derive(Debug)]
pub struct ManagedDirectory {
directory: Box<dyn Directory>,
meta_informations: Arc<RwLock<MetaInformation>>,
}
#[derive(Debug, Default)]
struct MetaInformation {
managed_paths: HashSet<PathBuf>,
}
fn save_managed_paths(
directory: &mut dyn Directory,
wlock: &RwLockWriteGuard<'_, MetaInformation>,
) -> io::Result<()> {
let mut w = serde_json::to_vec(&wlock.managed_paths)?;
writeln!(&mut w)?;
directory.atomic_write(&MANAGED_FILEPATH, &w[..])?;
Ok(())
}
impl ManagedDirectory {
pub fn wrap<Dir: Directory>(directory: Dir) -> Result<ManagedDirectory> {
match directory.atomic_read(&MANAGED_FILEPATH) {
Ok(data) => {
let managed_files_json = String::from_utf8_lossy(&data);
let managed_files: HashSet<PathBuf> = serde_json::from_str(&managed_files_json)
.map_err(|e| {
DataCorruption::new(
MANAGED_FILEPATH.to_path_buf(),
format!("Managed file cannot be deserialized: {:?}. ", e),
)
})?;
Ok(ManagedDirectory {
directory: Box::new(directory),
meta_informations: Arc::new(RwLock::new(MetaInformation {
managed_paths: managed_files,
})),
})
}
Err(OpenReadError::FileDoesNotExist(_)) => Ok(ManagedDirectory {
directory: Box::new(directory),
meta_informations: Arc::default(),
}),
Err(OpenReadError::IOError(e)) => Err(From::from(e)),
}
}
pub fn garbage_collect<L: FnOnce() -> HashSet<PathBuf>>(&mut self, get_living_files: L) {
info!("Garbage collect");
let mut files_to_delete = vec![];
{
let meta_informations_rlock = self
.meta_informations
.read()
.expect("Managed directory rlock poisoned in garbage collect.");
if let Ok(_meta_lock) = self.acquire_lock(&META_LOCK) {
let living_files = get_living_files();
for managed_path in &meta_informations_rlock.managed_paths {
if !living_files.contains(managed_path) {
files_to_delete.push(managed_path.clone());
}
}
} else {
error!("Failed to acquire lock for GC");
}
}
let mut deleted_files = vec![];
for file_to_delete in files_to_delete {
match self.delete(&file_to_delete) {
Ok(_) => {
info!("Deleted {:?}", file_to_delete);
deleted_files.push(file_to_delete);
}
Err(file_error) => {
match file_error {
DeleteError::FileDoesNotExist(_) => {
deleted_files.push(file_to_delete);
}
DeleteError::IOError(_) => {
if !cfg!(target_os = "windows") {
error!("Failed to delete {:?}", file_to_delete);
}
}
}
}
}
}
if !deleted_files.is_empty() {
let mut meta_informations_wlock = self
.meta_informations
.write()
.expect("Managed directory wlock poisoned (2).");
let managed_paths_write = &mut meta_informations_wlock.managed_paths;
for delete_file in &deleted_files {
managed_paths_write.remove(delete_file);
}
if save_managed_paths(self.directory.as_mut(), &meta_informations_wlock).is_err() {
error!("Failed to save the list of managed files.");
}
}
}
fn register_file_as_managed(&mut self, filepath: &Path) -> io::Result<()> {
if !is_managed(filepath) {
return Ok(());
}
let mut meta_wlock = self
.meta_informations
.write()
.expect("Managed file lock poisoned");
let has_changed = meta_wlock.managed_paths.insert(filepath.to_owned());
if has_changed {
save_managed_paths(self.directory.as_mut(), &meta_wlock)?;
}
Ok(())
}
}
impl Directory for ManagedDirectory {
fn open_read(&self, path: &Path) -> result::Result<ReadOnlySource, OpenReadError> {
self.directory.open_read(path)
}
fn open_write(&mut self, path: &Path) -> result::Result<WritePtr, OpenWriteError> {
self.register_file_as_managed(path)
.map_err(|e| IOError::with_path(path.to_owned(), e))?;
self.directory.open_write(path)
}
fn atomic_write(&mut self, path: &Path, data: &[u8]) -> io::Result<()> {
self.register_file_as_managed(path)?;
self.directory.atomic_write(path, data)
}
fn atomic_read(&self, path: &Path) -> result::Result<Vec<u8>, OpenReadError> {
self.directory.atomic_read(path)
}
fn delete(&self, path: &Path) -> result::Result<(), DeleteError> {
self.directory.delete(path)
}
fn exists(&self, path: &Path) -> bool {
self.directory.exists(path)
}
fn acquire_lock(&self, lock: &Lock) -> result::Result<DirectoryLock, LockError> {
self.directory.acquire_lock(lock)
}
fn watch(&self, watch_callback: WatchCallback) -> crate::Result<WatchHandle> {
self.directory.watch(watch_callback)
}
}
impl Clone for ManagedDirectory {
fn clone(&self) -> ManagedDirectory {
ManagedDirectory {
directory: self.directory.box_clone(),
meta_informations: Arc::clone(&self.meta_informations),
}
}
}
#[cfg(feature = "mmap")]
#[cfg(test)]
mod tests_mmap_specific {
use crate::directory::{Directory, ManagedDirectory, MmapDirectory};
use std::collections::HashSet;
use std::io::Write;
use std::path::{Path, PathBuf};
use tempdir::TempDir;
#[test]
fn test_managed_directory() {
let tempdir = TempDir::new("tantivy-test").unwrap();
let tempdir_path = PathBuf::from(tempdir.path());
let test_path1: &'static Path = Path::new("some_path_for_test");
let test_path2: &'static Path = Path::new("some_path_for_test_2");
{
let mmap_directory = MmapDirectory::open(&tempdir_path).unwrap();
let mut managed_directory = ManagedDirectory::wrap(mmap_directory).unwrap();
let mut write_file = managed_directory.open_write(test_path1).unwrap();
write_file.flush().unwrap();
managed_directory
.atomic_write(test_path2, &[0u8, 1u8])
.unwrap();
assert!(managed_directory.exists(test_path1));
assert!(managed_directory.exists(test_path2));
let living_files: HashSet<PathBuf> =
[test_path1.to_owned()].into_iter().cloned().collect();
managed_directory.garbage_collect(|| living_files);
assert!(managed_directory.exists(test_path1));
assert!(!managed_directory.exists(test_path2));
}
{
let mmap_directory = MmapDirectory::open(&tempdir_path).unwrap();
let mut managed_directory = ManagedDirectory::wrap(mmap_directory).unwrap();
assert!(managed_directory.exists(test_path1));
assert!(!managed_directory.exists(test_path2));
let living_files: HashSet<PathBuf> = HashSet::new();
managed_directory.garbage_collect(|| living_files);
assert!(!managed_directory.exists(test_path1));
assert!(!managed_directory.exists(test_path2));
}
}
#[test]
fn test_managed_directory_gc_while_mmapped() {
let test_path1: &'static Path = Path::new("some_path_for_test");
let tempdir = TempDir::new("index").unwrap();
let tempdir_path = PathBuf::from(tempdir.path());
let living_files = HashSet::new();
let mmap_directory = MmapDirectory::open(&tempdir_path).unwrap();
let mut managed_directory = ManagedDirectory::wrap(mmap_directory).unwrap();
managed_directory
.atomic_write(test_path1, &vec![0u8, 1u8])
.unwrap();
assert!(managed_directory.exists(test_path1));
let _mmap_read = managed_directory.open_read(test_path1).unwrap();
managed_directory.garbage_collect(|| living_files.clone());
if cfg!(target_os = "windows") {
assert!(managed_directory.exists(test_path1));
drop(_mmap_read);
managed_directory.garbage_collect(|| living_files);
assert!(!managed_directory.exists(test_path1));
} else {
assert!(!managed_directory.exists(test_path1));
}
}
}