267 lines
8.0 KiB
Rust
267 lines
8.0 KiB
Rust
use failure::*;
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use std::io;
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use std::path::{PathBuf, Path};
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use std::collections::HashMap;
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use lazy_static::lazy_static;
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use std::sync::{Mutex, Arc};
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use crate::tools;
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use crate::config::datastore;
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use super::chunk_store::*;
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use super::fixed_index::*;
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use super::dynamic_index::*;
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use super::index::*;
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use super::backup_info::*;
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use super::DataChunk;
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use crate::server::WorkerTask;
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lazy_static!{
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static ref DATASTORE_MAP: Mutex<HashMap<String, Arc<DataStore>>> = Mutex::new(HashMap::new());
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}
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/// Datastore Management
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///
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/// A Datastore can store severals backups, and provides the
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/// management interface for backup.
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pub struct DataStore {
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chunk_store: Arc<ChunkStore>,
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gc_mutex: Mutex<bool>,
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last_gc_status: Mutex<GarbageCollectionStatus>,
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}
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impl DataStore {
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pub fn lookup_datastore(name: &str) -> Result<Arc<DataStore>, Error> {
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let config = datastore::config()?;
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let (_, store_config) = config.sections.get(name)
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.ok_or(format_err!("no such datastore '{}'", name))?;
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let path = store_config["path"].as_str().unwrap();
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let mut map = DATASTORE_MAP.lock().unwrap();
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if let Some(datastore) = map.get(name) {
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// Compare Config - if changed, create new Datastore object!
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if datastore.chunk_store.base == PathBuf::from(path) {
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return Ok(datastore.clone());
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}
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}
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let datastore = DataStore::open(name)?;
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let datastore = Arc::new(datastore);
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map.insert(name.to_string(), datastore.clone());
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Ok(datastore)
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}
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pub fn open(store_name: &str) -> Result<Self, Error> {
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let config = datastore::config()?;
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let (_, store_config) = config.sections.get(store_name)
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.ok_or(format_err!("no such datastore '{}'", store_name))?;
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let path = store_config["path"].as_str().unwrap();
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let chunk_store = ChunkStore::open(store_name, path)?;
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let gc_status = GarbageCollectionStatus::default();
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Ok(Self {
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chunk_store: Arc::new(chunk_store),
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gc_mutex: Mutex::new(false),
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last_gc_status: Mutex::new(gc_status),
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})
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}
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pub fn get_chunk_iterator(
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&self,
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print_percentage: bool,
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) -> Result<
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impl Iterator<Item = Result<tools::fs::ReadDirEntry, Error>>,
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Error
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> {
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self.chunk_store.get_chunk_iterator(print_percentage)
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}
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pub fn create_fixed_writer<P: AsRef<Path>>(&self, filename: P, size: usize, chunk_size: usize) -> Result<FixedIndexWriter, Error> {
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let index = FixedIndexWriter::create(self.chunk_store.clone(), filename.as_ref(), size, chunk_size)?;
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Ok(index)
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}
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pub fn open_fixed_reader<P: AsRef<Path>>(&self, filename: P) -> Result<FixedIndexReader, Error> {
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let index = FixedIndexReader::open(self.chunk_store.clone(), filename.as_ref())?;
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Ok(index)
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}
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pub fn create_dynamic_writer<P: AsRef<Path>>(
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&self, filename: P,
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) -> Result<DynamicIndexWriter, Error> {
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let index = DynamicIndexWriter::create(
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self.chunk_store.clone(), filename.as_ref())?;
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Ok(index)
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}
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pub fn open_dynamic_reader<P: AsRef<Path>>(&self, filename: P) -> Result<DynamicIndexReader, Error> {
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let index = DynamicIndexReader::open(self.chunk_store.clone(), filename.as_ref())?;
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Ok(index)
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}
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pub fn open_index<P>(&self, filename: P) -> Result<Box<dyn IndexFile + Send>, Error>
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where
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P: AsRef<Path>,
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{
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let filename = filename.as_ref();
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let out: Box<dyn IndexFile + Send> =
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match filename.extension().and_then(|ext| ext.to_str()) {
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Some("didx") => Box::new(self.open_dynamic_reader(filename)?),
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Some("fidx") => Box::new(self.open_fixed_reader(filename)?),
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_ => bail!("cannot open index file of unknown type: {:?}", filename),
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};
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Ok(out)
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}
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pub fn base_path(&self) -> PathBuf {
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self.chunk_store.base_path()
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}
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/// Remove a backup directory including all content
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pub fn remove_backup_dir(&self, backup_dir: &BackupDir,
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) -> Result<(), io::Error> {
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let relative_path = backup_dir.relative_path();
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let mut full_path = self.base_path();
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full_path.push(&relative_path);
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log::info!("removing backup {:?}", full_path);
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std::fs::remove_dir_all(full_path)?;
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Ok(())
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}
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pub fn create_backup_dir(&self, backup_dir: &BackupDir) -> Result<(PathBuf, bool), io::Error> {
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// create intermediate path first:
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let mut full_path = self.base_path();
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full_path.push(backup_dir.group().group_path());
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std::fs::create_dir_all(&full_path)?;
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let relative_path = backup_dir.relative_path();
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let mut full_path = self.base_path();
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full_path.push(&relative_path);
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// create the last component now
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match std::fs::create_dir(&full_path) {
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Ok(_) => Ok((relative_path, true)),
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Err(ref e) if e.kind() == io::ErrorKind::AlreadyExists => Ok((relative_path, false)),
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Err(e) => Err(e)
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}
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}
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pub fn list_images(&self) -> Result<Vec<PathBuf>, Error> {
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let base = self.base_path();
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let mut list = vec![];
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use walkdir::WalkDir;
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let walker = WalkDir::new(&base).same_file_system(true).into_iter();
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// make sure we skip .chunks (and other hidden files to keep it simple)
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fn is_hidden(entry: &walkdir::DirEntry) -> bool {
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entry.file_name()
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.to_str()
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.map(|s| s.starts_with("."))
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.unwrap_or(false)
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}
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for entry in walker.filter_entry(|e| !is_hidden(e)) {
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let path = entry?.into_path();
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if let Some(ext) = path.extension() {
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if ext == "fidx" {
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list.push(path);
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} else if ext == "didx" {
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list.push(path);
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}
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}
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}
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Ok(list)
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}
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fn mark_used_chunks(&self, status: &mut GarbageCollectionStatus) -> Result<(), Error> {
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let image_list = self.list_images()?;
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for path in image_list {
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tools::fail_on_shutdown()?;
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if let Some(ext) = path.extension() {
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if ext == "fidx" {
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let index = self.open_fixed_reader(&path)?;
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index.mark_used_chunks(status)?;
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} else if ext == "didx" {
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let index = self.open_dynamic_reader(&path)?;
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index.mark_used_chunks(status)?;
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}
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}
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}
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Ok(())
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}
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pub fn last_gc_status(&self) -> GarbageCollectionStatus {
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self.last_gc_status.lock().unwrap().clone()
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}
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pub fn garbage_collection(&self, worker: Arc<WorkerTask>) -> Result<(), Error> {
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if let Ok(ref mut _mutex) = self.gc_mutex.try_lock() {
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let _exclusive_lock = self.chunk_store.try_exclusive_lock()?;
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let oldest_writer = self.chunk_store.oldest_writer();
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let mut gc_status = GarbageCollectionStatus::default();
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gc_status.upid = Some(worker.to_string());
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worker.log("Start GC phase1 (mark chunks)");
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self.mark_used_chunks(&mut gc_status)?;
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worker.log("Start GC phase2 (sweep unused chunks)");
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self.chunk_store.sweep_unused_chunks(oldest_writer, &mut gc_status)?;
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worker.log(&format!("Used bytes: {}", gc_status.used_bytes));
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worker.log(&format!("Used chunks: {}", gc_status.used_chunks));
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worker.log(&format!("Disk bytes: {}", gc_status.disk_bytes));
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worker.log(&format!("Disk chunks: {}", gc_status.disk_chunks));
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*self.last_gc_status.lock().unwrap() = gc_status;
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} else {
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bail!("Start GC failed - (already running/locked)");
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}
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Ok(())
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}
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pub fn insert_chunk(
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&self,
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chunk: &DataChunk,
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) -> Result<(bool, u64), Error> {
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self.chunk_store.insert_chunk(chunk)
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}
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}
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